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- \u5b89\u5168\u6027<\/li>\n<\/ul>\n\n\n\n
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ID\u7684\u7ec4\u6210\u90e8\u5206\uff1a
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<\/p>\n\n\n\n\u6211\u4eec\u5728utils\u4e2d\u65b0\u5efa\u4e00\u4e2aRedisIdWorker\uff0c\u5b9e\u73b0\u4e00\u4e2a\u57fa\u4e8eredis\u7684id\u751f\u6210\u5668\uff0c<\/p>\n\n\n\n
package com.hmdp.utils;\n\nimport org.springframework.data.redis.core.StringRedisTemplate;\n\nimport java.time.LocalDateTime;\nimport java.time.ZoneOffset;\nimport java.time.format.DateTimeFormatter;\n\npublic class RedisIdWorker {\n \/\/\u5f00\u59cb\u65f6\u95f4\u6233\n private static final long BEGIN_TIMESTAMP = 1640995200L;\n private static final int COUNT_BITS=32;\n private StringRedisTemplate stringRedisTemplate;\n public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {\n this.stringRedisTemplate = stringRedisTemplate;\n }\n\n public long nextId(String keyPrefix) {\n \/\/1.\u751f\u6210\u65f6\u95f4\u6233\n LocalDateTime now = LocalDateTime.now();\n long nowSecond = now.toEpochSecond(ZoneOffset.UTC);\n long timestamp = nowSecond - BEGIN_TIMESTAMP;\n \/\/2.\u751f\u6210\u5e8f\u5217\u53f7\n \/\/2.1.\u83b7\u53d6\u5f53\u524d\u65e5\u671f\uff0c\u7cbe\u786e\u5230\u5929\n String date =now.format(DateTimeFormatter.ofPattern(\"yyyy:MM:dd\"));\n \/\/2.2.\u767d\u589e\u957f\n long count =stringRedisTemplate.opsForValue().increment(\"icr:\" + keyPrefix +\":\"+ date);\n \/\/\u8fd9\u91cc\u8bb2\u7684\u5e94\u8be5\u662f\u5e8f\u5217\u53f7\u4f1a\u4e00\u76f4\u589e\u800c\u4e0d\u4f1a\u968f\u7740\u65f6\u95f4\u6233\u53d8\u5316\u800c\u5237\u65b0\u56de1\u7684\u610f\u601d\u5427\uff0c\u6240\u6709\u7684\u4e1a\u52a1\u751f\u6210id\u6b21\u6570\u8d85\u8fc7\u4e5f\u662f\u53ef\u80fd\u7684\n\n \/\/3.\u62fc\u63a5\u5e76\u8fd4\u56de\n \/\/\u76f4\u63a5\u52a0\u4e5f\u884c\uff0c\u4e0d\u8fc7\u6ca1\u6709\u6216\u8fd0\u7b97\u6548\u7387\u9ad8\n return timestamp << COUNT_BITS | count;\n }\n}\n<\/code><\/pre>\n\n\n\nHmDianPingApplicationTests.java\u5982\u4e0b<\/p>\n\n\n\n
package com.hmdp;\n\nimport com.hmdp.entity.Shop;\nimport com.hmdp.service.impl.ShopServiceImpl;\nimport com.hmdp.utils.CacheClient;\nimport com.hmdp.utils.RedisIdWorker;\n\nimport org.junit.jupiter.api.Test;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.boot.test.context.SpringBootTest;\nimport org.springframework.cache.CacheManager;\nimport org.springframework.data.redis.core.RedisTemplate;\nimport org.springframework.transaction.annotation.Transactional;\n\nimport javax.annotation.Resource;\nimport java.util.concurrent.CountDownLatch;\nimport java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\nimport java.util.concurrent.TimeUnit;\n\nimport static com.hmdp.utils.RedisConstants.CACHE_SHOP_KEY;\n\n@SpringBootTest\nclass HmDianPingApplicationTests {\n\n @Resource\n private ShopServiceImpl shopService;\n\n @Resource\n private CacheClient cacheClient;\n @Resource\n private RedisIdWorker redisIdWorker;\n @Resource\n private ExecutorService es=Executors.newFixedThreadPool(500);\n\n \/\/ CountDownLatch\u5927\u81f4\u7684\u539f\u7406\u662f\u5c06\u4efb\u52a1\u5207\u5206\u4e3aN\u4e2a\uff0c\u8ba9N\u4e2a\u5b50\u7ebf\u7a0b\u6267\u884c\uff0c\u5e76\u4e14\u6709\u4e00\u4e2a\u8ba1\u6570\u5668\u4e5f\u8bbe\u7f6e\u4e3aN\uff0c\u54ea\u4e2a\u5b50\u7ebf\u7a0b\u5b8c\u6210\u4e86\u5c31N-1\n @Test\n\n void testIdWorker() throws InterruptedException {\n CountDownLatch latch = new CountDownLatch(300);\n Runnable task=()->{\n for(int i =0;i<100;i++) {\n long id = redisIdWorker.nextId(\"order\");\n System.out.println(\"id =\" + id);\n }\n latch.countDown();\n };\n long begin = System.currentTimeMillis();\n for (int i = 0; i < 300; i++) {\n es.submit(task);\n }\n latch.await();\n long end = System.currentTimeMillis();\n System.out.println(\"time =\" + (end - begin));\n }\n\n @Test\n void testSaveShop()throws InterruptedException {\n Shop shop= shopService.getById(1L);\n cacheClient.setWithLogicalExpire(CACHE_SHOP_KEY+1L,shop, 10L,TimeUnit.SECONDS);\n }\n\n}<\/code><\/pre>\n\n\n\n\u6b7b\u4e86\u5988\u4e00\u6837\u6ca1\u6709\u4efb\u4f55\u5f15\u7528\u95ee\u9898\u4e3a\u4ec0\u4e48\u62a5\u9519\uff1f\uff1f\uff1f <\/p>\n\n\n\n
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\u6240\u4ee5\u8bf4\u539f\u7406\u4e0a\u6765\u8bb2\u4e5f\u53ef\u80fd\u5f88\u50cf\uff0c\u4f46\u662f\u4ece\u6027\u80fd\u6765\u89d2\u5ea6\u6765\u8003\u8651\uff0c\u6570\u636e\u5e93\u7684\u6027\u80fd\u80af\u5b9a\u4e0d\u5982redis\u667a\u80fd\u6027\u80fd\u66f4\u597d\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u6240\u4ee5\u8bf4\u4f01\u4e1a\u91cc\u5934\u53bb\u4f7f\u7528\u7a0e\u52a1\u81ea\u52a8\u7684\u65f6\u5019\u5f80\u5f80\u4f1a\u91c7\u53d6\u4e00\u4e9b\u65b9\u6848\uff0c\u6bd4\u5982\u8bf4\u6279\u91cf\u7684\u53bb\u83b7\u53d6ID\uff0c\u7136\u540e\u5728\u5185\u5b58\u7684\u7f13\u5b58\u8d77\u6765\uff0c\u7136\u540e\u518d\u53bb\u4f7f\u7528\u8fd9\u6837\u4e00\u79cd\u65b9\u6848\uff0c\u6211\u89c9\u5f97\u4e5f\u53ef\u4ee5\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u63d0\u9ad8\u5b83\u7684\u6027\u80fd\uff0c\u6240\u4ee5\u8fd9\u4e9b\u65b9\u6848\u7684\u8bdd\uff0c\u540e\u9762\u8fd9\u4e09\u79cd\u65b9\u6848\u5728\u4f01\u4e1a\u91cc\u90fd\u6709\u53bb\u5e94\u7528\uff0c\u540c\u5b66\u4eec\u53ef\u4ee5\u81ea\u5df1\u53bb\u767e\u5ea6\u4e00\u4e0b\uff0c\u7814\u7a76\u4e00\u4e0b\u8fd9\u4e9b\u65b9\u6848\u5b83\u7684\u4e00\u4e9b\u4e0d\u540c\u70b9\u3002<\/p>\n\n\n\n
\u90a3\u4e48\u6211\u4eec\u7684\u8ba4\u8bc6\u4e4b\u4e2d\u7684\u7b56\u7565\u6838\u5fc3\uff0c\u5927\u5bb6\u9700\u8981\u6ce8\u610f\u7684\uff0c\u9996\u5148\u5b83\u7684\u6574\u4f53\u7ed3\u6784\u65f6\u95f4\u6233\u52a0\u81ea\u589eID\uff0c\u5bf9\u5427\uff1f\u9996\u5148\u8bf4\u52a0\u603b\u88c1\u4e5f\u662f\u6574\u4f53\u7ed3\u6784\uff0c\u7136\u540e\u5728redis\u4fdd\u5b58 key\u7684\u65f6\u5019\u6709\u4e00\u4e2a\u9700\u8981\u6ce8\u610f\u7684\u4e8b\u9879\uff0c\u5c31\u662f\u6211\u4eec\u662f\u6bcf\u5929\u4e00\u4e2akey\uff0c\u8fd8\u6709\u4e24\u4e2a\u4f18\u52bf\uff0c\u7b2c\u4e00\u662f\u65b9\u4fbf\u7edf\u8ba1\u6bcf\u5929\u7684\u8ba2\u5355\u91cf\uff0c\u6bcf\u6708\u8ba2\u5355\u91cf\u548c\u6bcf\u5e74\u8ba2\u5355\u91cf\u3002\u7b2c\u4e8c\uff0c\u4ed6\u8fd8\u53ef\u4ee5\u53bb\u9650\u5b9a\u4ec0\u4e48 T\u5b57\uff0c\u4e2d\u7684\u4e00\u4e2a\u503c\u4e0d\u4f1a\u8ba9\u5b83\u592a\u5927\uff0c\u4ee5\u81f3\u4e8e\u8d85\u8fc7\u4e86\u6211\u4eec\u5b58\u50a8\u7684\u4e0a\u9650\u3002\u53e6\u5916\u5c31\u662f\u5b83\u7684\u7ed3\u6784\uff0c\u521a\u624d\u8bf4\u4e86\u65f6\u95f4\u51fa\u73b0\u8ba1\u6570\u5668\u7684\u65b9\u5f0f<\/p>\n\n\n\n
\u5b9e\u73b0\u4f18\u60e0\u5238\u79d2\u6740\u4e0b\u5355<\/h2>\n\n\n\n
\u6bcf\u4e2a\u5e97\u94fa\u90fd\u53ef\u4ee5\u53d1\u5e03\u4f18\u60e0\u5238\uff0c\u5206\u4e3a\u5e73\u4ef7\u5238\u548c\u7279\u4ef7\u5238\u3002\u5e73\u4ef7\u5238\u53ef\u4ee5\u4efb\u610f\u8d2d\u4e70\uff0c\u800c\u7279\u4ef7\u5238\u9700\u8981\u79d2\u6740\u62a2\u8d2d<\/p>\n\n\n\n
\u8868\u5173\u7cfb\u5982\u4e0b\uff1a
\u25cftb_voucher\uff1a\u4f18\u60e0\u5238\u7684\u57fa\u672c\u4fe1\u606f\uff0c\u4f18\u60e0\u91d1\u989d\u3001\u4f7f\u7528\u89c4\u5219\u7b49
\u25cftb_seckilL_voucher\uff1a\u4f18\u60e0\u5238\u7684\u5e93\u5b58\u3001\u5f00\u59cb\u62a2\u8d2d\u65f6\u95f4\uff0c\u7ed3\u675f\u62a2\u8d2d\u65f6\u95f4\u3002\u7279\u4ef7\u4f18\u60e0\u5238\u624d\u9700\u8981\u586b\u5199\u8fd9\u4e9b\u4fe1\u606f<\/p>\n\n\n\n\u4e3ahttp:\/\/localhost:8081\/voucher\/seckill<\/a>\u5728postman\u91cc\u9762post\u4fe1\u606f<\/p>\n\n\n\n
{\n \"shopId\":1,\n \"title\":\"100\u5143\u4ee3\u91d1\u5238\",\n \"subTitle\":\"\u5468\u4e00\u81f3\u5468\u4e94\u5747\u53ef\u4f7f\u7528\",\n \"rules\":\"\u5168\u573a\u901a\u7528\\\\n\u65e0\u9700\u9884\u7ea6\\\\n\u53ef\u65e0\u9650\u53e0\u52a0\\\\\u4e0d\u5151\u73b0\u3001\u4e0d\u627e\u96f6\\\\n\u4ec5\u9650\u5802\u98df\",\n \"payValue\":8000,\n \"actualValue\":10000,\n \"type\": 1,\n \"stock\":100,\n \"beginTime\":\"2024-08-24T11:45:14\",\n \"endTime\":\"2024-08-24T19:19:10\"\n}<\/code><\/pre>\n\n\n\n\u00a0\u53ef\u4ee5\u770b\u5230sql
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/1e0f9496b0104468a3f3a04c0c12bedc.png\")
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/be69268a3b3b48d6acd85599f2c6f362.png\")
<\/p>\n\n\n\n\u8fd9\u91cc\u5982\u679c\u9910\u5385\u540d\u5b57\u548c\u56fe\u7247\u4e0d\u663e\u793a\u7684\u56e0\u4e3a\u524d\u9762\u89e3\u51b3\u7f13\u5b58\u51fb\u7a7f\u4f7f\u7528\u4e86\u903b\u8f91\u8fc7\u671f\u65f6\u95f4\uff0c\u4eba\u9700\u8981\u6570\u636e\u9884\u70ed\uff0c\u5982\u679c\u4f60\u628aredis\u6570\u636e\u6e05\u9664\u4e86\u5c31\u6ca1\u9884\u70ed\u7684\u6570\u636e\u4e86\uff0c\u53ef\u4ee5\u628a\u89e3\u51b3\u7f13\u5b58\u51fb\u7a7f\u90a3\u4e2a\u6539\u6210\u7528\u7f13\u5b58\u7a7f\u900f<\/strong>\u7684\uff0c\u5c31\u4e0d\u7528\u6dfb\u52a0\u70ed\u70b9\u6570\u636e\u4e86\uff1b \u5982\u679c\u51fa\u73b0\u65b0\u6dfb\u52a0\u7684\u79d2\u6740\u5238\u4e0d\u663e\u793a\u7684\uff0c\u53bb\u6570\u636e\u5e93\u8be5\u8fc7\u671f\u65f6\u95f4\u5f80\u540e\u5ef6\u4e00\u5ef6\u5c31ok<\/strong><\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/f330af53d9cc464a8bb8f6b321797cc5.png\")
<\/p>\n\n\n\n\u4e0b\u5355\u65f6\u9700\u8981\u5224\u65ad\u4e24\u70b9\uff1a
\u79d2\u6740\u662f\u5426\u5f00\u59cb\u6216\u7ed3\u675f\uff0c\u5982\u679c\u5c1a\u672a\u5f00\u59cb\u6216\u5df2\u7ecf\u7ed3\u675f\u5219\u65e0\u6cd5\u4e0b\u5355
\u5e93\u5b58\u662f\u5426\u5145\u8db3\uff0c\u4e0d\u8db3\u5219\u65e0\u6cd5\u4e0b\u5355<\/p>\n\n\n\n\u00a0
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/6e25cdd2351d489095a17041997fdc09.png\")
<\/p>\n\n\n\nVoucherOrderController.java<\/p>\n\n\n\n
package com.hmdp.controller;\n\n\nimport com.hmdp.dto.Result;\nimport com.hmdp.service.IVoucherOrderService;\nimport org.springframework.web.bind.annotation.PathVariable;\nimport org.springframework.web.bind.annotation.PostMapping;\nimport org.springframework.web.bind.annotation.RequestMapping;\nimport org.springframework.web.bind.annotation.RestController;\n\nimport javax.annotation.Resource;\n\n@RestController\n@RequestMapping(\"\/voucher-order\")\npublic class VoucherOrderController {\n @Resource\n private IVoucherOrderService voucherOrderService;\n\n @PostMapping(\"seckill\/{id}\")\n public Result seckillVoucher(@PathVariable(\"id\") Long voucherId) {\n return voucherOrderService.seckillVoucher(voucherId);\n }\n}\n<\/code><\/pre>\n\n\n\nIVoucherOrderService.java<\/p>\n\n\n\n
package com.hmdp.service;\n\nimport com.hmdp.dto.Result;\nimport com.hmdp.entity.VoucherOrder;\nimport com.baomidou.mybatisplus.extension.service.IService;\n\npublic interface IVoucherOrderService extends IService<VoucherOrder> {\n\n Result seckillVoucher(Long voucherId);\n}\n<\/code><\/pre>\n\n\n\nVoucherOrderServicelmpl.java\uff08\u53ef\u80fd\u6709nullntr\u7684\u95ee\u9898\uff09<\/p>\n\n\n\n
package com.hmdp.service.impl;\n\nimport com.hmdp.dto.Result;\nimport com.hmdp.entity.SeckillVoucher;\nimport com.hmdp.entity.VoucherOrder;\nimport com.hmdp.mapper.VoucherOrderMapper;\nimport com.hmdp.service.ISeckillVoucherService;\nimport com.hmdp.service.IVoucherOrderService;\nimport com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;\nimport com.hmdp.service.IVoucherService;\nimport com.hmdp.utils.RedisIdWorker;\nimport com.hmdp.utils.UserHolder;\nimport org.springframework.stereotype.Service;\nimport org.springframework.transaction.annotation.Transactional;\n\nimport javax.annotation.Resource;\nimport java.time.LocalDateTime;\n\n\n@Service\npublic class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {\n\n @Resource\n private ISeckillVoucherService seckillVoucherService;\n @Resource\n private RedisIdWorker redisIdWorker;\n @Transactional\n @Override\n public Result seckillVoucher(Long voucherId) {\n \/\/1.\u67e5\u8be2\u4f18\u60e0\u5238\u62ff\u5230\u4fe1\u606f;\u5176\u5b9e\u540e\u7eedRedission\u53ef\u4ee5\u76f4\u63a5\u7528\u4fe1\u53f7\u91cf\u6765\u9501\u5e93\u5b58\n SeckillVoucher voucher =seckillVoucherService.getById(voucherId);\n \/\/2.\u5224\u65ad\u79d2\u6740\u662f\u5426\u5f00\u59cb\n if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {\n \/\/\u5c1a\u672a\u5f00\u59cb\n return Result.fail(\"\u79d2\u6740\u5c1a\u672a\u5f00\u59cb\uff01\");\n }\n \/\/3.\u5224\u65ad\u79d2\u6740\u662f\u5426\u5df2\u7ecf\u7ed3\u675f\n if (voucher.getEndTime().isBefore(LocalDateTime.now())){\n \/\/\u5c1a\u672a\u5f00\u59cb\n return Result.fail(\"\u79d2\u6740\u5df2\u7ecf\u7ed3\u675f\uff01\");\n }\n \/\/4.\u5224\u65ad\u5e93\u5b58\u662f\u5426\u5145\u8db3\n if (voucher.getStock()<1) {\n \/\/\u5e93\u5b58\u4e0d\u8db3\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }\n \/\/5.\u6263\u51cf\u5e93\u5b58\n boolean success = seckillVoucherService.update()\n .setSql(\"stock=stock-1\")\n .eq(\"voucher_id\",voucherId).update();\n if (!success) {\n \/\/\u6263\u51cf\u5931\u8d25\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }\n \/\/6.\u521b\u5efa\u8ba2\u5355\n VoucherOrder voucherOrder = new VoucherOrder();\n \/\/ 6.1. \u8ba2\u5355id\n long orderId = redisIdWorker.nextId( \"order\");\n voucherOrder.setId(orderId);\n \/\/ 6.2. \u7528\u6237id\n Long userId = UserHolder.getUser().getId();\n voucherOrder.setUserId(userId);\n \/\/ 6.3. \u4ee3\u91d1\u5238id\n voucherOrder.setVoucherId(voucherId);\n save(voucherOrder);\n \/\/7.\u8fd4\u56de\u8ba2\u5355id\n return Result.ok(orderId);\n }\n}\n<\/code><\/pre>\n\n\n\n![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/92906498a1244066aa65a7f033ff97b0.png\")
<\/p>\n\n\n\n\u8d85\u5356\u95ee\u9898<\/h2>\n\n\n\n
\u7ebf\u7a0b\u6570\uff1a200
Ramp-Up\u65f6\u95f4\uff08\u79d2\uff09\uff1a1![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/168d54056d6e42f8b7a371c0414dd88b.png\")
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/938139ff397a4ecabfabe22e581d9c3f.png\")
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/43b5712fb5334915a311c3391701f11d.png\")
<\/p>\n\n\n\n\u53bbRefreshTokenInterceptor\u7c7b\u4e2d\u83b7\u53d6\u5bf9\u5e94\u7684authorization\u503c(\u53ef\u7528redis\u9898\u76ee\u7684\u65b9\u5f0f\u83b7\u53d6)\uff0c\u518d\u5c06\u503c\u586b\u5165JMeter\u7684\u767b\u5f55\u72b6\u6001\u5934\u4e2d\uff1b\u4ee5\u65b0\u589e\u4e00\u4e2a\u4fe1\u606f\u5934\u7ba1\u7406\u5668 \u7136\u540e\u628aauthorization\u53c2\u6570\u503c\u5e26\u4e0a\u5c31\u53ef\u4ee5\u4e86<\/p>\n\n\n\n
\u53d1\u7ed9\u4f60\u7684\u6587\u4ef6\u91cc\u6709\u8fd9\u4e2ajmx\u53ef\u4ee5\u76f4\u63a5\u7528\uff0c\u5220\u9664\u521a\u521a\u4f60\u90a3\u6761\u8bb0\u5f55\uff0c\u4f60\u53d1\u73b0100\u5f20\u5377\u5356\u51fa109\u5f20\uff0c\u660e\u663e\u7684\u8d85\u5356\uff0c\u5c45\u7136\u662f-9\u5f20
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/bd711a005cc042bea88c9d44e397bcc6.png\")
<\/p>\n\n\n\n\u4e3a\u4ec0\u4e48\uff1f\u5b9e\u9645\u4e0a\u5c31\u662f\u5728\u5e93\u5b58\u4e3a1\u7684\u65f6\u5019 \u6709\u591a\u4e2a\u7ebf\u7a0b\u90fd\u901a\u8fc7\u4e86if\u5224\u65ad<\/strong><\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/6278606dc29d4c5888125c479dded398.png\")
<\/p>\n\n\n\n\u8d85\u5356\u95ee\u9898\u662f\u5178\u578b\u7684\u591a\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u9488\u5bf9\u8fd9\u4e00\u95ee\u9898\u7684\u5e38\u89c1\u89e3\u51b3\u65b9\u6848\u5c31\u662f\u52a0\u9501\uff1a\u6211\u4eec\u4e4b\u524d\u5728\u89e3\u51b3\u7f13\u5b58\u51fb\u7a7f\u7684\u65f6\u5019\uff0c\u6240\u91c7\u7528\u7684\u9501\u5c31\u662f\u60b2\u89c2\u9501<\/p>\n\n\n\n
- \n
- \u60b2\u89c2\u9501
\u8ba4\u4e3a\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u4e00\u5b9a\u4f1a\u53d1\u751f\uff0c\u56e0\u6b64\u5728\u64cd\u4f5c\u6570\u636e\u4e4b\u524d\u5148\u83b7\u53d6\u9501\uff0c\u786e\u4fdd\u7ebf\u7a0b\u4e32\u884c\u6267\u884c\u3002\u4f8b\u5982Synchronized\u3001Lock\u90fd\u5c5e\u4e8e\u60b2\u89c2\u9501\u00a0\u3002\u5f53\u7136\u6027\u80fd\u4e0d\u548b\u5730<\/li>\n\n\n\n - \u4e50\u89c2\u9501
\u8ba4\u4e3a\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u4e0d\u4e00\u5b9a\u4f1a\u53d1\u751f\uff0c\u56e0\u6b64\u4e0d\u52a0\u9501\uff0c\u53ea\u662f\u5728\u66f4\u65b0\u6570\u636e\u65f6\u53bb\u5224\u65ad\u6709\u6ca1\u6709\u5176\u5b83\u7ebf\u7a0b\u5bf9\u6570\u636e\u505a\u4e86\u4fee\u6539\u3002
\u5982\u679c\u6ca1\u6709\u4fee\u6539\u5219\u8ba4\u4e3a\u662f\u5b89\u5168\u7684\uff0c\u81ea\u5df1\u624d\u66f4\u65b0\u6570\u636e\u3002
\u5982\u679c\u5df2\u7ecf\u88ab\u5176\u5b83\u7ebf\u7a0b\u4fee\u6539\u8bf4\u660e\u53d1\u751f\u4e86\u5b89\u5168\u95ee\u9898\uff0c\u6b64\u65f6\u53ef\u4ee5\u91cd\u8bd5\u6216\u5f02\u5e38\u3002<\/li>\n<\/ol>\n\n\n\n![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/c184c8c16aba4c77ac723228811bbdd3.png\")
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/78983b98c74442ccb5bfdd2417015bac.png\")
<\/p>\n\n\n\nVoucherOrderServicelmpl.java\u4fee\u6539\u4e00\u4e0b<\/p>\n\n\n\n
\/\/5.\u6263\u51cf\u5e93\u5b58\n boolean success = seckillVoucherService.update()\n .setSql(\"stock=stock-1\")\/\/\u8fd9\u91cc\u4e00\u5b9a\u662f\u76f8\u7b49\u7684\u5427\uff0c\u5e94\u8be5\u662f\u4e4b\u524d\u67e5\u5230\u7684\uff0c\u4f60\u73b0\u5728\u73b0\u67e5\uff0c\u80af\u5b9a\u76f8\u540c\n .eq(\"voucher_id\",voucherId).eq(\"stock\",voucher.getStock())\n .update();\n if (!success) {\n \/\/\u6263\u51cf\u5931\u8d25\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }<\/code><\/pre>\n\n\n\n\u4ee5\u540e\u5bf9\u5e93\u5b58\u53bb\u505a\u4e00\u4e2a\u5224\u65ad\uff0c\u5b8c\u4e86\u4ee5\u540e\u53bb\u6263\u51cf\u5e93\u5b58\u3002\u90a3\u4e48\u6309\u7167\u6211\u4eec\u4e4b\u524d\u5206\u6790\u7684\u6240\u8c13\u7684\u4e50\u89c2\u9501\u65b9\u6848\uff0c\u5176\u5b9e\u5c31\u662f\u5728\u6267\u884c\u6263\u51cf\u7684\u8fd9\u4e00\u523b\u53bb\u52a0\u4e0a\u4e00\u4e2a\u6761\u4ef6\uff0c\u5224\u65ad\u4ec0\u4e48\uff1f\u6211\u66f4\u65b0\u65f6\u7684\u8fd9\u4e00\u523b\uff0c\u5e93\u5b58\u503c\u4e0e\u6211\u67e5\u8be2\u5230\u7684\u5e93\u5b58\u503c\u662f\u4e0d\u662f\u540c\u4e00\u4e2a\uff1f\u5982\u679c\u662f\u8bc1\u660e\u5728\u6211\u4e4b\u524d\u6ca1\u4eba\u4fee\u6539\u8fc7\uff0c\u6211\u662f\u4e0d\u662f\u5c31\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u4fee\u6539\u4e86\u3002\u6240\u4ee5\u8bf4\u6211\u9700\u8981\u5728word\u6761\u4ef6\u91cc\u53bb\u6dfb\u52a0\u4e00\u4e2a\u5bf9stock\u503c\u7684\u5224\u65ad\uff0c\u5b83\u7684\u503c\u5c31\u662f\u6211\u67e5\u5230\u7684\u503c\uff0c\u6211\u67e5\u5230\u7684\u503c\u662f\u4e0d\u662f\u5c31\u662fstock\u503c
\u8fd9\u4e2a\u4ee3\u7801\u7ed9\u5927\u5bb6\u89e3\u91ca\u4e00\u4e0b\uff0c\u8fd9\u91cc\u7684set\u5176\u5b9e\u7b49\u4e8eset\u6761\u4ef6\uff0c\u4e5f\u5c31\u662fsetstock=stock-1\uff0c\u4e0b\u9762\u8fd9\u4e24\u4e2a\u662fwhere\u6761\u4ef6\uff1f\u5b83\u4eec\u7b49\u4e8e\uff1fWhere\uff1fId\u7b49\u4e8e\u4e00\u4e2a\uff1fStock\u7b49\u4e8e\u4e00\u4e2a\uff1f\u597d\uff0c\u6240\u4ee5\u5176\u5b9e\u5bf9\u7f57\u4f2f\u65af\u7684\u5224
\u65ad\uff0c\u53ea\u8981\u6211\u5728\u66f4\u65b0\u65f6where\u6761\u4ef6\u5e93\u5b58\u503c\uff0c\u7b49\u4e8e\u6211\u67e5\u8be2\u5230\u7684\u5e93\u5b58\u503c\u8bc1\u660e\u6211\u4e0a\u9762\u8fd9\u4e2a\u5224\u65ad\u662f\u6ca1\u6709\u95ee\u9898\u7684\uff0c\u8bc1\u660e\u5728\u6211\u4e4b\u524d\u6ca1\u6709\u4eba\u4fee\u6539\u8fc7\uff0c\u6211\u653e\u5fc3\u5927\u80c6\u53bb\u6263\u662f\u4e0d\u662f\u5c31\u6ca1\u95ee\u9898\uff1f<\/p>\n\n\n\n\u4e3a\u4ec0\u4e48\u4e0d\u662f\u628a\u4e00\u5f00\u59cb\u67e5\u5230\u7684\u5e93\u5b58\u7528\u53d8\u91cf\u5b58\u8d77\u6765\u53bb\u505awhere\u5224\u65ad\uff1f\u800c\u662f\u518d\u8c03\u7528\u4e00\u6b21\uff0c\u8c03\u7528\u7684\u4e0d\u5c31\u662f\u6b64\u523b\u5e93\u5b58\u7684\u5417\uff1f\u90a3\u4e0d\u5c31\u4e00\u5b9a\u6210\u7acb\u5417\uff1f <\/p>\n\n\n\n
tb voucher order\u6570\u636e\u5168\u90e8\u5220\u9664\uff0c\u4f18\u60e0\u5377\u91cd\u65b0\u6539\u6210100\u5f20\u4f59\u989d<\/p>\n\n\n\n
\u7ed3\u679c\u53ea\u5356\u51fa\u53bb20\u5f20\uff0c\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f\uff1f\uff1f\u00a0
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/0e7ce4361fc14a4fbae5ca9bbd962277.png\")
<\/p>\n\n\n\n\u73b0\u5728\u5047\u8bbe\u8bf4\u6211\u7684\u5e93\u5b58\u8fd8\u5269100\uff0c\u7136\u540e\u6709\u65e0\u6570\u7684\u7ebf\u7a0b\u90fd\u6d8c\u5165\u8fdb\u6765\u4e86\uff0c\u6ca1\u52a0\u9501\u90a3\u8fd9\u4e9b\u7ebf\u7a0b\u662f\u4e0d\u662f\u5c31\u5e76\u884c\u6267\u884c\uff0c\u6bd4\u5982\u8bf4100\u4e2a\u7ebf\u7a0b\uff0c\u90fd\u67e5\u5230\u4e86100\uff0c\u7136\u540e\u6211\u4eec\u63a5\u4e0b\u6765\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u4f1a\u53bb\u6267\u884c\u8fd9\u4e2a\u66f4\u65b0\u7684\u52a8\u4f5c\uff0c\u5224\u65ad\u662f\u5426\u5927\u4e8e0\uff0c\u7136\u540e\u5c31\u662f\u90a3\u6837\uff0c\u73b0\u5728\u53d8\u621099\u4e86\uff0c\u90a3\u8fd9\u5269\u4e0b\u768499\u4e2a\u7ebf\u7a0b\u90fd\u4f1a\u8ba4\u4e3a\u4ec0\u4e48\u5728\u6211\u4e4b\u524d\u6709\u4eba\u6539\u4e86\uff0c\u4e0d\u80fd\u53bb\u72af\u9519\u8bef\u5c31\u53d6\u6d88\uff1b\u5931\u8d25\u7387\u5927\u5927\u63d0\u9ad8<\/p>\n\n\n\n
\u6211\u4eec\u4e0d\u518d\u5224\u65ad\u5e93\u5b58\u662f\u5426\u4e0e\u6211\u67e5\u5230\u7684\u76f8\u7b49\u4e86\uff0c\u6211\u4eec\u53ea\u8981\u5224\u65ad\u5e93\u5b58\u5927\u4e8e\u96f6\uff0c<\/p>\n\n\n\n
\/\/5.\u6263\u51cf\u5e93\u5b58\n boolean success = seckillVoucherService.update()\n .setSql(\"stock=stock-1\")\/\/\u8fd9\u91cc\u4e00\u5b9a\u662f\u76f8\u7b49\u7684\u5427\uff0c\u5e94\u8be5\u662f\u4e4b\u524d\u67e5\u5230\u7684\uff0c\u4f60\u73b0\u5728\u73b0\u67e5\uff0c\u80af\u5b9a\u76f8\u540c\n .eq(\"voucher_id\",voucherId).gt(\"stock\",0)\n .update();\n if (!success) {\n \/\/\u6263\u51cf\u5931\u8d25\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }<\/code><\/pre>\n\n\n\n\u5220\u6389\u6570\u636e\u5e93\u7684\u5185\u5bb9\uff0c \u91cd\u65b0\u8bbe\u7f6e\u4f59\u989d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6570\u636e\u5e93100\u5f20\u6b63\u597d\u5356\u5b8c\uff08\u8fd9\u5176\u5b9e\u4e5f\u662f\u60b2\u89c2\u9501\uff0c\u6570\u636e\u5e93\u7684\u60b2\u89c2<\/p>\n\n\n\n
update\u8bed\u53e5\u6709\u6392\u5b83\u9501\uff0c\u4e0d\u53ef\u80fd\u540c\u65f6\u4e24\u4e2a\u4e8b\u52a1\u4fee\u6539\u8be5\u6570\u636e<\/p>\n\n\n\n
\u4e00\u4eba\u4e00\u5355<\/h2>\n\n\n\n
\u4fee\u6539\u79d2\u6740\u4e1a\u52a1\uff0c\u8981\u6c42\u540c\u4e00\u4e2a\u4f18\u60e0\u5238\uff0c\u4e00\u4e2a\u7528\u6237\u53ea\u80fd\u4e0b\u4e00\u5355\uff0c\u5728\u5f53\u524d\u60c5\u51b5\u4e0b\u6211\u4eec\u5728\u8fd9\u4e2a\u8ba2\u5355\u8868\u91cc\u9762\u7684\u6240\u6709\u7684\uff0c\u8fd9100\u5f20\u8ba2\u5355\u7adf\u7136\u90fd\u662f\u540c\u4e00\u4e2a\u7528\u6237\u4e70<\/p>\n\n\n\n
\u80fd\u5426 \u7ed9\u7528\u6237id\u548c\u4f18\u60e0\u5238id\u5efa\u7acb\u8054\u5408\u7684\u552f\u4e00\u7d22\u5f15\uff1f\uff1f\uff1f<\/p>\n\n\n\n
\u4fee\u6539\u79d2\u6740\u903b\u8f91<\/p>\n\n\n\n
package com.hmdp.service.impl;\n\nimport com.hmdp.dto.Result;\nimport com.hmdp.entity.SeckillVoucher;\nimport com.hmdp.entity.VoucherOrder;\nimport com.hmdp.mapper.VoucherOrderMapper;\nimport com.hmdp.service.ISeckillVoucherService;\nimport com.hmdp.service.IVoucherOrderService;\nimport com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;\nimport com.hmdp.service.IVoucherService;\nimport com.hmdp.utils.RedisIdWorker;\nimport com.hmdp.utils.UserHolder;\nimport org.springframework.stereotype.Service;\nimport org.springframework.transaction.annotation.Transactional;\n\nimport javax.annotation.Resource;\nimport java.time.LocalDateTime;\n\n\n@Service\npublic class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {\n\n @Resource\n private ISeckillVoucherService seckillVoucherService;\n @Resource\n private RedisIdWorker redisIdWorker;\n @Transactional\n @Override\n public Result seckillVoucher(Long voucherId) {\n \/\/1.\u67e5\u8be2\u4f18\u60e0\u5238\u62ff\u5230\u4fe1\u606f;\u5176\u5b9e\u540e\u7eedRedission\u53ef\u4ee5\u76f4\u63a5\u7528\u4fe1\u53f7\u91cf\u6765\u9501\u5e93\u5b58\n SeckillVoucher voucher =seckillVoucherService.getById(voucherId);\n \/\/2.\u5224\u65ad\u79d2\u6740\u662f\u5426\u5f00\u59cb\n if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {\n \/\/\u5c1a\u672a\u5f00\u59cb\n return Result.fail(\"\u79d2\u6740\u5c1a\u672a\u5f00\u59cb\uff01\");\n }\n \/\/3.\u5224\u65ad\u79d2\u6740\u662f\u5426\u5df2\u7ecf\u7ed3\u675f\n if (voucher.getEndTime().isBefore(LocalDateTime.now())){\n \/\/\u5c1a\u672a\u5f00\u59cb\n return Result.fail(\"\u79d2\u6740\u5df2\u7ecf\u7ed3\u675f\uff01\");\n }\n \/\/4.\u5224\u65ad\u5e93\u5b58\u662f\u5426\u5145\u8db3\n if (voucher.getStock()<1) {\n \/\/\u5e93\u5b58\u4e0d\u8db3\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }\n \/\/6.\u4e00\u4eba\u4e00\u5355\n Long userId = UserHolder.getUser().getId();\n \/\/6.1.\u67e5\u8be2\u8ba2\u5355\n int count = query().eq(\"user_id\",userId).eq(\"voucher_id\", voucherId).count();\n \/\/6.2.\u5224\u65ad\u662f\u5426\u5b58\u5728\n if(count>0) {\n \/\/\u7528\u6237\u5df2\u7ecf\u8d2d\u4e70\u8fc7\u4e86\n return Result.fail(\"\u7528\u6237\u5df2\u7ecf\u8d2d\u4e70\u8fc7\u4e00\u6b21\uff01\");\n }\n \/\/5.\u6263\u51cf\u5e93\u5b58\n boolean success = seckillVoucherService.update()\n .setSql(\"stock=stock-1\")\/\/\u8fd9\u91cc\u4e00\u5b9a\u662f\u76f8\u7b49\u7684\u5427\uff0c\u5e94\u8be5\u662f\u4e4b\u524d\u67e5\u5230\u7684\uff0c\u4f60\u73b0\u5728\u73b0\u67e5\uff0c\u80af\u5b9a\u76f8\u540c\n .eq(\"voucher_id\",voucherId).gt(\"stock\",0)\n .update();\n if (!success) {\n \/\/\u6263\u51cf\u5931\u8d25\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }\n \/\/7.\u521b\u5efa\u8ba2\u5355\n VoucherOrder voucherOrder = new VoucherOrder();\n \/\/ 7.1. \u8ba2\u5355id\n long orderId = redisIdWorker.nextId( \"order\");\n voucherOrder.setId(orderId);\n \/\/ 7.2. \u7528\u6237id\n voucherOrder.setUserId(userId);\n \/\/ 7.3. \u4ee3\u91d1\u5238id\n voucherOrder.setVoucherId(voucherId);\n save(voucherOrder);\n \/\/8.\u8fd4\u56de\u8ba2\u5355id\n return Result.ok(orderId);\n }\n}\n<\/code><\/pre>\n\n\n\n\n
\u8be5\u4ee3\u7801\u5728\u4e00\u4eba\u4e00\u5355\u6821\u9a8c <\/strong>\u73af\u8282\u5b58\u5728\u660e\u663e\u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u53ef\u80fd\u5bfc\u81f4\u5e76\u53d1\u4e0b\u5355\u3002\u5177\u4f53\u5206\u6790\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\u662f\u7684\uff0c\u8fd9\u53e5\u8bdd\u662f\u6b63\u786e\u7684\u3002\u8be5\u4ee3\u7801\u5728**\u4e00\u4eba\u4e00\u5355\u6821\u9a8c**\u73af\u8282\u5b58\u5728\u660e\u663e\u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u53ef\u80fd\u5bfc\u81f4\u5e76\u53d1\u4e0b\u5355\u3002<\/p>\n\n\n\n
**\u95ee\u9898\u6839\u6e90**
1. **\u7ade\u6001\u6761\u4ef6\uff08Race Condition\uff09**
\u4ee3\u7801\u4e2d\u7684 `\u67e5\u8be2\u8ba2\u5355` \u548c `\u521b\u5efa\u8ba2\u5355` \u662f\u4e24\u4e2a\u72ec\u7acb\u7684\u64cd\u4f5c\uff0c\u4e0d\u5177\u6709\u539f\u5b50\u6027\u3002\u5f53\u591a\u4e2a\u8bf7\u6c42\u540c\u65f6\u5230\u8fbe\u65f6\uff1a
- \u7ebf\u7a0bA\u67e5\u8be2\u8ba2\u5355\uff0c\u53d1\u73b0\u7528\u6237\u672a\u4e0b\u5355\uff08`count=0`\uff09\u3002
- \u7ebf\u7a0bB\u51e0\u4e4e\u540c\u65f6\u67e5\u8be2\u8ba2\u5355\uff0c\u4e5f\u5f97\u5230 `count=0`\u3002
- \u4e24\u4e2a\u7ebf\u7a0b\u90fd\u4f1a\u901a\u8fc7\u6821\u9a8c\uff0c\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u7684\u6263\u5e93\u5b58\u548c\u4e0b\u5355\u903b\u8f91\uff0c\u5bfc\u81f4\u540c\u4e00\u7528\u6237\u751f\u6210\u591a\u4e2a\u8ba2\u5355\u3002<\/p>\n\n\n\n2. **\u4e8b\u52a1\u8fb9\u754c\u95ee\u9898**
\u867d\u7136\u65b9\u6cd5\u6807\u6ce8\u4e86 `@Transactional`\uff0c\u4f46\u4e8b\u52a1\u7684\u751f\u6548\u8303\u56f4\u662f**\u65b9\u6cd5\u5185\u6574\u4f53**\uff0c\u800c\u6570\u636e\u5e93\u7684\u9694\u79bb\u7ea7\u522b\uff08\u5982 `READ COMMITTED`\uff09\u65e0\u6cd5\u4fdd\u8bc1 `query().count()` \u7684\u5b9e\u65f6\u53ef\u89c1\u6027\u3002\u5728\u5e76\u53d1\u573a\u666f\u4e0b\uff0c\u4e8b\u52a1\u5185\u7684\u4e2d\u95f4\u72b6\u6001\u53ef\u80fd\u5bf9\u5176\u4ed6\u4e8b\u52a1\u4e0d\u53ef\u89c1\u3002<\/p>\n\n\n\n**\u89e3\u51b3\u65b9\u6848**
\u9700\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u4fdd\u8bc1\u539f\u5b50\u6027\uff1a<\/p>\n\n\n\n1. **\u6570\u636e\u5e93\u552f\u4e00\u7ea6\u675f**
- \u5728 `voucher_order` \u8868\u7684 `(user_id, voucher_id)` \u5b57\u6bb5\u4e0a\u6dfb\u52a0**\u552f\u4e00\u7d22\u5f15**\u3002
- \u6355\u83b7\u6570\u636e\u5e93\u63d2\u5165\u5f02\u5e38\uff08\u5982 `DuplicateKeyException`\uff09\uff0c\u9632\u6b62\u91cd\u590d\u4e0b\u5355\u3002
```java
\/\/ \u521b\u5efa\u8ba2\u5355\u65f6\u6355\u83b7\u5f02\u5e38
try {
save(voucherOrder);
} catch (DuplicateKeyException e) {
return Result.fail(\"\u7528\u6237\u5df2\u4e0b\u5355\");
}
```
**\u4f18\u70b9**\uff1a\u7b80\u5355\u53ef\u9760\uff0c\u76f4\u63a5\u4f9d\u8d56\u6570\u636e\u5e93\u7ea6\u675f\u3002
**\u7f3a\u70b9**\uff1a\u9700\u5904\u7406\u5f02\u5e38\uff0c\u53ef\u80fd\u5f71\u54cd\u6027\u80fd\u3002<\/p>\n\n\n\n2. **\u5206\u5e03\u5f0f\u9501**
- \u4f7f\u7528 Redis \u6216\u5176\u4ed6\u5206\u5e03\u5f0f\u9501\uff0c\u786e\u4fdd\u540c\u4e00\u7528\u6237\u540c\u4e00\u4f18\u60e0\u5238\u7684\u4e0b\u5355\u64cd\u4f5c\u4e32\u884c\u5316\u3002
```java
\/\/ \u793a\u4f8b\uff1a\u4f7f\u7528Redisson\u7684RLock
RLock lock = redissonClient.getLock(\"lock:order:user:\" + userId + \":voucher:\" + voucherId);
try {
lock.lock();
\/\/ \u6267\u884c\u539f\u6709\u903b\u8f91
} finally {
lock.unlock();
}
```
**\u4f18\u70b9**\uff1a\u5b8c\u5168\u907f\u514d\u5e76\u53d1\u51b2\u7a81\u3002
**\u7f3a\u70b9**\uff1a\u589e\u52a0\u7cfb\u7edf\u590d\u6742\u5ea6\uff0c\u9700\u5904\u7406\u9501\u7ade\u4e89\u548c\u6b7b\u9501\u3002<\/p>\n\n\n\n3. **\u4e50\u89c2\u9501\uff08CAS\uff09**
- \u5728\u6263\u51cf\u5e93\u5b58\u65f6\uff0c\u7ed3\u5408\u7248\u672c\u53f7\u6216\u6761\u4ef6\u66f4\u65b0\uff08\u5982 `stock=stock-1 WHERE stock>0`\uff09\u4fdd\u8bc1\u5e93\u5b58\u6263\u51cf\u7684\u539f\u5b50\u6027\u3002
- \u4f46\u9700\u6ce8\u610f\uff1a\u8fd9\u53ea\u80fd\u89e3\u51b3\u5e93\u5b58\u8d85\u5356\u95ee\u9898\uff0c\u65e0\u6cd5\u76f4\u63a5\u89e3\u51b3\u4e00\u4eba\u591a\u5355\u95ee\u9898\u3002<\/p>\n\n\n\n*\u4ee3\u7801\u6539\u8fdb\u5efa\u8bae**
\u7ed3\u5408\u552f\u4e00\u7d22\u5f15\u548c\u4e8b\u52a1\u56de\u6eda\uff1a<\/p>\n\n\n\n@Transactional
@Override
public Result seckillVoucher(Long voucherId) {
\u00a0 \u00a0 \/\/ ...\u5176\u4ed6\u6821\u9a8c\u903b\u8f91\uff08\u65f6\u95f4\u3001\u5e93\u5b58\uff09...
\u00a0 \u00a0 \/\/ \u4e00\u4eba\u4e00\u5355\u6821\u9a8c\uff08\u4f9d\u8d56\u6570\u636e\u5e93\u552f\u4e00\u7d22\u5f15\uff09
\u00a0 \u00a0 Long userId = UserHolder.getUser().getId();
\u00a0 \u00a0 try {
\u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u76f4\u63a5\u5c1d\u8bd5\u63d2\u5165\u8ba2\u5355\uff0c\u4f9d\u8d56\u552f\u4e00\u7d22\u5f15\u629b\u51fa\u5f02\u5e38
\u00a0 \u00a0 \u00a0 \u00a0 VoucherOrder voucherOrder = new VoucherOrder();
\u00a0 \u00a0 \u00a0 \u00a0 voucherOrder.setId(redisIdWorker.nextId(\"order\"));
\u00a0 \u00a0 \u00a0 \u00a0 voucherOrder.setUserId(userId);
\u00a0 \u00a0 \u00a0 \u00a0 voucherOrder.setVoucherId(voucherId);
\u00a0 \u00a0 \u00a0 \u00a0 save(voucherOrder); \/\/ \u82e5\u91cd\u590d\u63d2\u5165\uff0c\u629b\u51faDuplicateKeyException
\u00a0 \u00a0 } catch (DuplicateKeyException e) {
\u00a0 \u00a0 \u00a0 \u00a0 return Result.fail(\"\u7528\u6237\u5df2\u4e0b\u5355\");
\u00a0 \u00a0 }
\u00a0 \u00a0 \/\/ \u6263\u51cf\u5e93\u5b58\uff08\u9700\u4fdd\u8bc1\u539f\u5b50\u6027\uff09
\u00a0 \u00a0 boolean success = seckillVoucherService.update()
\u00a0 \u00a0 \u00a0 \u00a0 .setSql(\"stock = stock - 1\")
\u00a0 \u00a0 \u00a0 \u00a0 .eq(\"voucher_id\", voucherId)
\u00a0 \u00a0 \u00a0 \u00a0 .gt(\"stock\", 0)
\u00a0 \u00a0 \u00a0 \u00a0 .update();
\u00a0 \u00a0 if (!success) {
\u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u6263\u51cf\u5931\u8d25\uff0c\u56de\u6eda\u8ba2\u5355\uff08\u9700\u624b\u52a8\u5904\u7406\u6216\u4f9d\u8d56\u4e8b\u52a1\uff09
\u00a0 \u00a0 \u00a0 \u00a0 throw new RuntimeException(\"\u5e93\u5b58\u6263\u51cf\u5931\u8d25\");
\u00a0 \u00a0 }
\u00a0 \u00a0 return Result.ok(orderId);
}
\u539f\u4ee3\u7801\u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u786e\u5b9e\u5b58\u5728\uff0c\u5fc5\u987b\u901a\u8fc7**\u6570\u636e\u5e93\u7ea6\u675f**\u6216**\u5206\u5e03\u5f0f\u9501**\u786e\u4fdd\u539f\u5b50\u6027\u3002\u63a8\u8350\u4f18\u5148\u4f7f\u7528\u6570\u636e\u5e93\u552f\u4e00\u7d22\u5f15\uff0c\u56e0\u5176\u7b80\u5355\u4e14\u53ef\u9760\u3002\u6b64\u5904\u7684\u95ee\u9898\u4f9d\u7136\u662f\u7531\u4e8e\u9694\u79bb\u7ea7\u522b\u7684\u95ee\u9898\uff0c\u9ed8\u8ba4RR<\/code><\/pre>\n<\/blockquote>\n\n\n\n![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/9258489cc68846b2b348626ef9c56237.png\")
<\/p>\n\n\n\n\u5bf9\u4e8e\u4e00\u4eba\u4e00\u5355\u7684\u5224\u65ad\u662f\u5728\u8fd9\u91cc \uff0c \u5148\u67e5\u8be2\u51fa\u8ba2\u5355\uff0c\u6839\u636e\u7528\u6237id\u548cvouchar id\u3002\u90a3\u6211\u62ff\u8fd9\u4e2a\u67e5\u7ed3\u679c\u4e00\u5b9a\u662f0.\u90a3\u4e48<\/p>\n\n\n\n
if(count>0) {\n \/\/\u7528\u6237\u5df2\u7ecf\u8d2d\u4e70\u8fc7\u4e86\n return Result.fail(\"\u7528\u6237\u5df2\u7ecf\u8d2d\u4e70\u8fc7\u4e00\u6b21\uff01\");\n}<\/pre>\n\n\n\n\u5c31\u4e00\u5b9a\u662f\u4e0d\u662f\u5c31\u5f80\u4e0b\u8d70\u76f4\u63a5\u4e0b\u5355\u4e86\uff0c\u90a3\u56e0\u4e3a\u5462\u4f60\u662f\u4e00\u4e2a\u591a\u7ebf\u7a0b\u5e76\u53d1\u64cd\u4f5c\uff0c\u4f60\u5c31\u4f1a\u51fa\u73b0\u591a\u4e2a\u7ebf\u7a0b\u7a7f\u63d2\u6267\u884c\u7684\u60c5\u51b5\uff0c\u90a3\u4e2a\u4e00\u4eba\u4e00\u5355\u4e5f\u662f\u5982\u6b64\uff1b\u73b0\u5728\u5462\u5047\u8bbe\u8bf4\u6211\u4eec\u7684\u6570\u636e\u5e93\u91cc\u6839\u672c\u5c31\u6ca1\u6709\u8ba2\u5355\uff0c\u6709100\u4e2a\u7ebf\u7a0b\u90fd\u6765\u6267\u884c\u8fd9\u4e2a\u903b\u8f91\uff0c\u5927\u5bb6\u90fd\u6765\u505a\u67e5\u8be2\u67e5\u5230\u90fd\u662f0\uff0c\u4e5f\u5c31\u662f\u8bf4\u73b0\u5728\u6ca1\u6709\u4efb\u4f55\u4e00\u4e2a\u4eba\u53bb\u505a\u63d2\u5165\uff0c\u8981\u5e76\u53d1\u7684\u60c5\u51b5\u4e0b\u90fd\u662f0\uff0c\u90fd\u4e0d\u6210\u7acb\uff0c\u90fd\u5f80\u4e0b\u8d70\uff0c\u4e8e\u662f\u5c31\u8fde\u7eed\u63d2\u5165\u4e86n\u591a\u6761\u8ba2\u5355\uff1b\u5982\u679c\u4e0d\u5141\u8bb8\u591a\u5e73\u53f0\u591a\u7aef\u767b\u5f55\u7684\u8bdd\u8fd9\u91cc\u786e\u5b9e\u5df2\u7ecf\u89e3\u51b3\u4e86\uff0c\u540e\u7eed\u8bb2\u7684\u662f\u4e00\u4e2a\u7528\u6237\u77ac\u95f4\u5e76\u53d1\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u6d89\u53ca\u7684\u77e5\u8bc6\u70b9\u6709\u70b9\u591a<\/p>\n\n\n\n
\u6211\u4eec\u9700\u8981\u628a\u8fd9\u4e00\u6bb5\u903b\u8f91\u554a\u7ed9\u5b83\u505a\u4e00\u4e2a\u60b2\u89c2\u9501\u5c01\u88c5<\/p>\n\n\n\n
\u800c\u662f\u5f53\u524d\u7528\u6237\u6211\u4eec\u4ee5\u7528\u6237id\u518d\u53bb\u52a0\u9501\uff0c\u8fd9\u6837\u7684\u8bdd\u6211\u4eec\u662f\u4e0d\u662f\u53ef\u4ee5\u53bb\u628a\u9501\u7684\u8303\u56f4\u7f29\u5c0f\u4e86\uff0c\u4e5f\u5c31\u662f\u8bf4\u540c\u4e00\u4e2a\u7528\u6237\u6211\u53bb\u52a0\u4e00\u628a\u9501\uff0c\u4e0d\u540c\u7528\u6237\u52a0\u4e0d\u540c\u9501\u3002\u56e0\u6b64\u5728\u8fd9\u91cc\u4e0d\u7528synchronize\u7684\u8fd9\u79cd\u65b9\u6cd5\uff0c\u7528\u5173\u952e\u5b57<\/p>\n\n\n\n
userId.toString\uff0c\u6211\u4eec\u671f\u671b\u7684\u662fid\u503c\u4e00\u6837\u7684\u4f5c\u4e3a\u4e00\u628a\u9501\uff0c\u4f46\u662f\u6bcf\u4e00\u4e2a\u8bf7\u6c42\u6765\u8fd9\u4e2aid\u5bf9\u8c61\u662f\u4e0d\u662f\u90fd\u662f\u4e00\u4e2a\u5168\u65b0\u7684id\u5bf9\u8c61\uff0c\u56e0\u6b64\u7684\u8bdd\u5462\u8fd9\u4e2a\u5bf9\u8c61\u53d8\u4e86\u9501\u4e5f\u53d8\u4e86\uff0c\u8fd9\u4e0d\u884c\uff0c\u6211\u4eec\u8981\u6c42\u7684\u662f\u503c\u4e00\u6837\u6240\u6709\u4f7f\u7528tostring\u3002\u4f46\u662ftostring\u5c31\u80fd\u4fdd\u8bc1\u5b83\u662f\u6309\u7167\u503c\u6765\u52a0\u9501\u7684\u5417\uff1f\u5176\u5b9e\u5728\u8fd9\u4e2atostring\u65b9\u6cd5\u91cc\u9762\u5e95\u5c42\u8c03\u7528\u7684\u554a\u662f\u8fd9\u4e2along\u7684\u4e00\u4e2a\u9759\u6001\u7684\u7279\u5f81\u51fd\u6570\uff0c\u5728\u5b83\u7684\u5185\u90e8\u5176\u5b9e\u662fnew\u4e86\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u90a3\u4e48\u6bcf\u8c03\u7528\u4e00\u6b21tostring\u90fd\u662f\u4e00\u4e2a\u5168\u65b0\u7684\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u4e5f\u5c31\u662f\u8fd9\u4e2a\u9501\u5bf9\u8c61\u662f\u8fd8\u4f1a\u518d\u53d8\uff0c\u5373\u4f7f\u4f60id\u4e00\u6837\uff08\u5e38\u91cf\u6c60\u624d\u4f1a\u590d\u7528\uff0cnew\u7684\u8bdd\u662f\u6bcf\u6b21\u5728\u5806\u91cc\u5f00\u8f9f\u4e00\u4e2a\u65b0\u5bf9\u8c61\uff0c\u56e0\u6b64\u503c\u4e00\u6837\u5bf9\u8c61\u5730\u5740\u4e5f\u4e0d\u540c\uff09JVM\u5b66\u7684<\/p>\n\n\n\n
package com.hmdp.service.impl;\n\nimport com.hmdp.dto.Result;\nimport com.hmdp.entity.SeckillVoucher;\nimport com.hmdp.entity.VoucherOrder;\nimport com.hmdp.mapper.VoucherOrderMapper;\nimport com.hmdp.service.ISeckillVoucherService;\nimport com.hmdp.service.IVoucherOrderService;\nimport com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;\nimport com.hmdp.service.IVoucherService;\nimport com.hmdp.utils.RedisIdWorker;\nimport com.hmdp.utils.UserHolder;\nimport org.springframework.stereotype.Service;\nimport org.springframework.transaction.annotation.Transactional;\n\nimport javax.annotation.Resource;\nimport java.time.LocalDateTime;\n\n\n@Service\npublic class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {\n\n @Resource\n private ISeckillVoucherService seckillVoucherService;\n @Resource\n private RedisIdWorker redisIdWorker;\n\n @Override\n public Result seckillVoucher(Long voucherId) {\n \/\/1.\u67e5\u8be2\u4f18\u60e0\u5238\u62ff\u5230\u4fe1\u606f;\u5176\u5b9e\u540e\u7eedRedission\u53ef\u4ee5\u76f4\u63a5\u7528\u4fe1\u53f7\u91cf\u6765\u9501\u5e93\u5b58\n SeckillVoucher voucher =seckillVoucherService.getById(voucherId);\n \/\/2.\u5224\u65ad\u79d2\u6740\u662f\u5426\u5f00\u59cb\n if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {\n \/\/\u5c1a\u672a\u5f00\u59cb\n return Result.fail(\"\u79d2\u6740\u5c1a\u672a\u5f00\u59cb\uff01\");\n }\n \/\/3.\u5224\u65ad\u79d2\u6740\u662f\u5426\u5df2\u7ecf\u7ed3\u675f\n if (voucher.getEndTime().isBefore(LocalDateTime.now())){\n \/\/\u5c1a\u672a\u5f00\u59cb\n return Result.fail(\"\u79d2\u6740\u5df2\u7ecf\u7ed3\u675f\uff01\");\n }\n \/\/4.\u5224\u65ad\u5e93\u5b58\u662f\u5426\u5145\u8db3\n if (voucher.getStock()<1) {\n \/\/\u5e93\u5b58\u4e0d\u8db3\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }\n return createVoucherOrder(voucherId);\n }\n\n \/\/\u4f60\u4f1a\u6ce8\u610f\u5230\u4e0a\u9762\u90a3\u4e2a\u6807\u9ec4\u4e86\uff0c\u8fd9\u91cc\u4e8b\u52a1\u662f\u6ca1\u7528\u7684,\u4e8b\u52a1\u6ce8\u89e3\u7684\u672c\u8d28\u662f\u4e00\u4e2a\u5207\u9762\u7c7b,\u8fd9\u91cc\u53ea\u6709\u91c7\u7528\u4ee3\u7406\u5bf9\u8c61\u8c03\u7528\u624d\u4f1a\u751f\u6548,\u76f4\u63a5\u5728\u672c\u7c7b\u8c03\u7528\u662f\u4e0d\u7ecf\u8fc7\u5207\u9762\u7684\n @Transactional\n public Result createVoucherOrder(Long voucherId) {\/\/\u6211\u4eec\u7684\u540c\u6b65\u9501\u5c31\u662fthis,\u662f\u5f53\u524d\u5bf9\u8c61\n \/\/\u53e6\u5916\u5462\u8fd9\u4e2a\u4e8b\u52a1\u7684\u8303\u56f4\u5176\u5b9e\u662f\u66f4\u65b0\u6570\u636e\u5e93\u7684\u4e00\u4e2a\u8303\u56f4\uff1a\u4e5f\u5c31\u662f\u8bf4\u505a\u51cf\u5e93\u5b58\u64cd\u4f5c\u548c\u521b\u5efa\u7535\u5b50\u64cd\u4f5c\u800c\u4e0d\u662f\u6574\u4e2a\u64cd\u4f5c\n \/\/6.\u4e00\u4eba\u4e00\u5355\n Long userId = UserHolder.getUser().getId();\n\n synchronized (userId.toString().intern()) {\/\/\u5b9e\u73b0\u540c\u6b65\u4ee3\u7801\u5757\n \/\/6.1.\u67e5\u8be2\u8ba2\u5355\n int count = query().eq(\"user_id\", userId).eq(\"voucher_id\", voucherId).count();\n \/\/6.2.\u5224\u65ad\u662f\u5426\u5b58\u5728\n if (count > 0) {\n \/\/\u7528\u6237\u5df2\u7ecf\u8d2d\u4e70\u8fc7\u4e86\n return Result.fail(\"\u7528\u6237\u5df2\u7ecf\u8d2d\u4e70\u8fc7\u4e00\u6b21\uff01\");\n }\n \/\/5.\u6263\u51cf\u5e93\u5b58\n boolean success = seckillVoucherService.update()\n .setSql(\"stock=stock-1\")\/\/\u8fd9\u91cc\u4e00\u5b9a\u662f\u76f8\u7b49\u7684\u5427\uff0c\u5e94\u8be5\u662f\u4e4b\u524d\u67e5\u5230\u7684\uff0c\u4f60\u73b0\u5728\u73b0\u67e5\uff0c\u80af\u5b9a\u76f8\u540c\n .eq(\"voucher_id\", voucherId).gt(\"stock\", 0)\n .update();\n if (!success) {\n \/\/\u6263\u51cf\u5931\u8d25\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }\n \/\/7.\u521b\u5efa\u8ba2\u5355\n VoucherOrder voucherOrder = new VoucherOrder();\n \/\/ 7.1. \u8ba2\u5355id\n long orderId = redisIdWorker.nextId(\"order\");\n voucherOrder.setId(orderId);\n \/\/ 7.2. \u7528\u6237id\n voucherOrder.setUserId(userId);\n \/\/ 7.3. \u4ee3\u91d1\u5238id\n voucherOrder.setVoucherId(voucherId);\n save(voucherOrder);\n \/\/8.\u8fd4\u56de\u8ba2\u5355id\n return Result.ok(orderId);\n }\n }\n}\n<\/code><\/pre>\n\n\n\n\u6211\u4eec\u73b0\u5728\u5462\u662f\u5728\u65b9\u6cd5\u5185\u90e8\u6765\u53bb\u52a0\u7684\u9501 \uff0c\u90a3\u4e4b\u524d\u6211\u4eecsynchronized\u52a0\u5728\u65b9\u6cd5\u4e0a\u7684\u8bdd\uff0c\u662f\u4e0d\u662f\u5bf9\u6574\u4e2a\u65b9\u6cd5\u52a0\u9501\u90a3\u73b0\u5728\u5728\u65b9\u6cd5\u5185\u90e8\u52a0\u9501\u5c31\u4f1a\u5b58\u5728\u4e00\u4e2a\u95ee\u9898\u554a\uff0c\u6bd4\u65b9\u8bf4\u6211\u4eec\u73b0\u5728\u8fd9\u91cc\u5f00\u542f\u4e8b\u52a1\u5f00\u59cb\u6267\u884c\uff0c\u6267\u884c\u4e86\u4e4b\u540e\u6211\u4eec\u83b7\u53d6\u9501\u6216\u9501\u4e86\u4ee5\u540e\uff0c\u6211\u5f00\u59cb\u505a\u8fd9\u4e2a\u67e5\u8be2\u5bf9\u5427\uff0c\u90a3\u7136\u540e\u67e5\u8be2\u5b8c\u4e86\u4ee5\u540e\uff0c\u6211\u5c31\u51cf\u5e93\u5b58\uff0c\u63d0\u4ea4\u8ba2\u5355\uff0c\u63d0\u4ea4\u8ba2\u5355\u5b8c\u4e86\u4ee5\u540e\uff0c\u6211\u5148\u91ca\u653e\u9501\u624d\u4f1a\u63d0\u4ea4\u4e8b\u52a1\uff0c\u5bf9\u4e0d\u5bf9\u554a\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u4e8b\u52a1\u662f\u88ab\u6211\u4eecSpring\u7ba1\u7406\u4e86\uff0c\u6240\u4ee5\u8fd9\u4e2a\u4e8b\u52a1\u7684\u63d0\u4ea4\uff0c\u5b83\u662f\u5728\u6211\u4eec\u65b9\u6cd5\u51fd\u6570\u6267\u884c\u5b8c\u4ee5\u540e\uff0c\u7531Spring\u505a\u7684\u63d0\u4ea4\uff0c\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\u5176\u5b9e\u9501\u5728\u8fd9\u4e2a\u5927\u62ec\u53f7\u7ed3\u675f\u4e86\u4ee5\u540e\uff0c\u5df2\u7ecf\u91ca\u653e\u4e86\uff0c\u90a3\u540c\u5b66\u4eec\u5982\u679c\u9501\u91ca\u653e\u4e86\uff0c\u610f\u5473\u7740\u5176\u4ed6\u7ebf\u7a0b\u662f\u4e0d\u662f\u5df2\u7ecf\u53ef\u4ee5\u8fdb\u6765\u4e86\uff0c\u800c\u6b64\u65f6\u56e0\u4e3a\u4e8b\u52a1\u5c1a\u672a\u63d0\u4ea4\u554a\uff0c\u5982\u679c\u6709\u5176\u4ed6\u7ebf\u7a0b\u8fdb\u6765\u53bb\u67e5\u8be2\u8ba2\u5355\u7684\u8bdd\uff0c\u90a3\u6211\u4eec\u521a\u521a\u65b0\u589e\u7684\u8fd9\u4e2a\u8ba2\u5355\u5f88\u6709\u53ef\u80fd\u8fd8\u6ca1\u6709\u5199\u5165\u6570\u636e\u5e93\uff0c\u5bf9\u4e0d\u5bf9\uff0c\u56e0\u4e3a\u4f60\u6ca1\u63d0\u4ea4\uff0c\u6240\u4ee5\u8bf4\u4ed6\u518d\u53bb\u67e5\u8be2\u7684\u65f6\u5019\u4f9d\u7136\u4e0d\u5b58\u5728\uff0c\u662f\u4e0d\u662f\u6709\u53ef\u80fd\u51fa\u73b0\u5e76\u53d1\u5b89\u5168\u95ee\u9898\uff0c\u90a3\u4e48\u56e0\u6b64\u6211\u4eec\u8fd9\u4e2a\u9501\u5b83\u9501\u5b9a\u7684\u8303\u56f4\u6709\u70b9\u5c0f\u4e86\uff0c\u4ed6\u5e94\u8be5\u662f\u628a\u8fd9\u6574\u4e2a\u51fd\u6570\u9501\u8d77\u6765\uff0c\u90a3\u8fd9\u6837\u4e00\u6765\u5e94\u8be5\u662f\u4e8b\u52a1\u63d0\u4ea4\u4e4b\u540e\uff0c\u6211\u4eec\u518d\u53bb\u91ca\u653e\u9501\uff0c\u5bf9\u4e0d\u5bf9\u554a\uff0c\u90a3\u4f60\u8bf4\u90a3\u600e\u4e48\u529e\u5462\uff0c\u90a3\u4f60\u8fd9\u4e2asynchronized\u52a0\u5728\u8fd9\u91cc\u5176\u5b9e\u5c31\u4e0d\u5408\u9002\u4e86\u554a\uff0c\u5927\u5bb6\u8981\u6ce8\u610f\u8fd9\u4e2a\u8303\u56f4\u4e86\u554a\uff0c\u90a3\u8981\u52a0\u5728\u54ea\u91cc\u5462\uff0c\u6211\u4eec\u628a\u8fd9\u4e2a\u5220\u6389\uff0c\u6211\u4eec\u5e94\u8be5\u662f\u52a0\u5728\u8fd9\u4e2a\u51fd\u6570\u5230\u5916\u8fb9\u5bf9\u5427\uff0c\u628a\u6574\u4e2a\u51fd\u6570\u9501\u8d77\u6765\u554a\uff0c\u5728\u8fd9\u4e2a\u5730\u65b9\u53bb\u52a0\u9501\uff0c\u90a3\u5f53\u7136\u4e86\uff0c\u4f60\u5728\u8fd9\u4e2a\u5730\u65b9\u52a0\u9501\u7684\u5bf9\u8c61\u662f\u7528\u6237\u7684id\u5417\uff0c\u6240\u4ee5\u8bf4\u4f60\u9700\u8981\u5728\u5916\u8fb9\u53bb\u83b7\u53d6\u8fd9\u4e2a\u7528\u6237id\uff0c\u7136\u540e\u4e0a\u9501\u5bf9\u5427\uff0c\u54ce\uff0c\u8fd9\u4e48\u6765\u505a\u624d\u662fok\u7684\u3002<\/p>\n\n\n\n
\/\/4.\u5224\u65ad\u5e93\u5b58\u662f\u5426\u5145\u8db3\n if (voucher.getStock() < 1) {\n \/\/\u5e93\u5b58\u4e0d\u8db3\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }\n Long userId = UserHolder.getUser().getId();\n synchronized (userId.toString().intern()) {\n return createVoucherOrder(voucherId);\n }\n}\n\n\/\/\u4f60\u4f1a\u6ce8\u610f\u5230\u4e0a\u9762\u90a3\u4e2a\u6807\u9ec4\u4e86\uff0c\u8fd9\u91cc\u4e8b\u52a1\u662f\u6ca1\u7528\u7684,\u4e8b\u52a1\u6ce8\u89e3\u7684\u672c\u8d28\u662f\u4e00\u4e2a\u5207\u9762\u7c7b,\u8fd9\u91cc\u53ea\u6709\u91c7\u7528\u4ee3\u7406\u5bf9\u8c61\u8c03\u7528\u624d\u4f1a\u751f\u6548,\u76f4\u63a5\u5728\u672c\u7c7b\u8c03\u7528\u662f\u4e0d\u7ecf\u8fc7\u5207\u9762\u7684\n@Transactional\npublic Result createVoucherOrder(Long voucherId) {\/\/\u6211\u4eec\u7684\u540c\u6b65\u9501\u5c31\u662fthis,\u662f\u5f53\u524d\u5bf9\u8c61\n \/\/\u53e6\u5916\u5462\u8fd9\u4e2a\u4e8b\u52a1\u7684\u8303\u56f4\u5176\u5b9e\u662f\u66f4\u65b0\u6570\u636e\u5e93\u7684\u4e00\u4e2a\u8303\u56f4\uff1a\u4e5f\u5c31\u662f\u8bf4\u505a\u51cf\u5e93\u5b58\u64cd\u4f5c\u548c\u521b\u5efa\u7535\u5b50\u64cd\u4f5c\u800c\u4e0d\u662f\u6574\u4e2a\u64cd\u4f5c\n \/\/6.\u4e00\u4eba\u4e00\u5355\n Long userId = UserHolder.getUser().getId();\n \/\/6.1.\u67e5\u8be2\u8ba2\u5355\n int count = query().eq(\"user_id\", userId).eq(\"voucher_id\", voucherId).count();\n<\/pre>\n\n\n\n\u6ce8\u610f\u6b64\u65f6\u7684\u9501\u8ddf\u65b9\u6cd5\u7684\u9501\u6709\u5f88\u5927\u533a\u522b:\u65b9\u6cd5\u7684\u9501\u662fthis\u5bf9\u8c61,\u800c\u73b0\u5728\u7684\u9501\u8fd8\u662fuser\u5bf9\u8c61 \u7528 Lock \u9501\u5c31\u53ef\u4ee5\u624b\u52a8\u89e3\u9501\u4e86\uff0c\u6bd4\u8f83\u65b9\u4fbf<\/p>\n\n\n\n
\u76f4\u63a5\u52a0\u8f7d\u65b9\u6cd5\u4e0a\u662f\u5bf9\u65b9\u6cd5\u52a0\u9501,\u6240\u6709\u7ebf\u7a0b\u6267\u884c\u8be5\u65b9\u6cd5\u90fd\u662f\u5355\u7ebf\u7a0b\u7684,\u4f46\u662fsynchronized\u5173\u952e\u5b57\u662f\u5bf9\u76f8\u540c\u7684\u5bf9\u8c61\u8fdb\u884c\u52a0\u9501,\u4e0d\u540c\u7684\u5bf9\u8c61\u4e92\u4e0d\u5f71\u54cd,\u76f8\u540c\u7684\u5bf9\u8c61\u4e3a\u5355\u7ebf\u7a0b\uff08\u5b9e\u9645\u4e0a\u8fd9\u91cc\u662f\u9519\u8bef\u7684 \u4e8b\u52a1\u5e95\u5c42\u662faop\u5b9e\u73b0\u7684 \u56e0\u6b64 \u8c03\u7528\u88ab\u5305\u88c5\u65b9\u6cd5\u5e94\u8be5\u91c7\u7528aopcontext\uff09<\/p>\n\n\n\n
\u8fd9\u91cc\u8fd8\u5b58\u5728\u4e00\u4e2a\u4e8b\u52a1\u7684\u95ee\u9898\u554a\uff0c\u4ec0\u4e48\u4e8b\u52a1\u95ee\u9898\u5462\uff1f\u6211\u4eec\u5728\u8fd9\u91cc\u662f\u5bf9\u5f53\u524d\u7684`createVoucherOrder`\u51fd\u6570\u52a0\u4e86\u4e8b\u52a1\uff0c\u4f46\u6ca1\u6709\u7ed9\u5916\u9762\u8fd9\u4e2a\u51fd\u6570\u52a0\u3002\u800c\u5916\u9762\u8fd9\u4e2a\u51fd\u6570\u5728\u8c03\u7528\u7684\u65f6\u5019\u662f\u8fd9\u6837\u8c03\u7528\u7684\uff0c\u8fd9\u79cd\u8c03\u7528\u5176\u5b9e\u662f\u7528`this`\u8c03\u7684\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u5c31\u7701\u53bb\u4e86\u4e00\u4e2a`this`\u3002\u90a3\u4e48\u8fd9\u79cd\u8c03\u7528\u7684\u8bdd\uff0c\u5176\u5b9e\u8fd9\u4e2a`this`\u62ff\u7684\u662f\u8c01\u5462\uff1f\u662f\u5f53\u524d\u7684VoucherOrderServiceImpl`\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u5b83\u7684\u4ee3\u7406\u5bf9\u8c61\u3002\u6211\u4eec\u77e5\u9053\uff0c\u4e8b\u52a1\u8981\u60f3\u751f\u6548\uff0c\u662f\u56e0\u4e3aSpring\u5bf9\u5f53\u524d\u8fd9\u4e2a\u7c7b\u505a\u4e86\u52a8\u6001\u4ee3\u7406\uff0c\u62ff\u5230\u4e86\u5b83\u7684\u4ee3\u7406\u5bf9\u8c61\uff0c\u7528\u5b83\u6765\u505a\u7684\u4e8b\u52a1\u5904\u7406\u3002\u90a3\u73b0\u5728\u4f60\u8fd9\u4e2a`this`\u5176\u5b9e\u6307\u7684\u662f\u975e\u4ee3\u7406\u5bf9\u8c61\uff0c\u4e5f\u5c31\u662f\u76ee\u6807\u5bf9\u8c61\uff0c\u6240\u4ee5\u5b83\u662f\u6ca1\u6709\u4e8b\u52a1\u529f\u80fd\u7684\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u8fd9\u4e2a\u662f\u6211\u4eec\u8bb2Spring\u4e8b\u52a1\u5931\u6548\u7684\u51e0\u79cd\u53ef\u80fd\u6027\u4e4b\u4e00\u561b\uff0c\u90a3\u8fd9\u5c31\u662f\u4e00\u79cd\u53ef\u80fd\u6027\u554a\u3002\u90a3\u4e48\u5927\u5bb6\u5728\u7f51\u4e0a\u5e94\u8be5\u4e5f\u90fd\u770b\u5230\u8fc7\u5bf9\u5e94\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848\u5427\uff0c\u600e\u4e48\u89e3\u51b3\u5462\uff1f\u5176\u5b9e\uff0c\u5728\u8fd9\u4e2a\u5730\u65b9\u7684\u8bdd\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u501f\u52a9\u4e00\u4e2aAPI\uff0c\u53eb\u505a`AopContext`\uff0c\u5229\u7528\u5b83\u91cc\u9762\u7684`currentProxy`\u65b9\u6cd5\uff0c\u90a3\u4e48\u5c31\u80fd\u591f\u62ff\u5230\u5f53\u524d\u5bf9\u8c61\u7684\u4ee3\u7406\u5bf9\u8c61\u4e86\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a`proxy`\u3002\u90a3\u5f53\u524d\u5bf9\u8c61\u662f\u8c01\u5462\uff1f\u5176\u5b9e\u5c31\u662f\u8fd9\u4e2a\u63a5\u53e3`IVoucherOrderService`\u7684\u4ee3\u7406\u5bf9\u8c61\u5bf9\u5427\uff1f\u6240\u4ee5\u8fd9\u91cc\u5c31\u7528\u8fd9\u4e2a\u6765\u63a5\u6536\u5c31\u53ef\u4ee5\u4e86\u554a\uff0c\u7136\u540e\u7ed9\u5b83\u505a\u4e2a\u5f3a\u8f6c\uff0c\u5b83\u8fd4\u56de\u7684\u662f`Object`\uff0c\u4f46\u6211\u4eec\u77e5\u9053\u5b83\u80af\u5b9a\u662f`IVoucherOrderService`\uff0c\u90a3\u6211\u4eec\u5c31\u62ff\u5230\u4e86\u5f53\u524d\u4ee3\u7406\u5bf9\u8c61\u4e86\u3002\u8fd9\u4e2a\u65f6\u5019\u5462\uff0c\u6211\u4eec\u7528\u4ee3\u7406\u5bf9\u8c61\u6765\u8c03\u7528\u8fd9\u4e2a`createVoucherOrder`\u51fd\u6570\uff0c\u800c\u4e0d\u662f\u7528`this`\uff0c\u90a3\u4e48\u8fd9\u6837\u7684\u8bdd\uff0c\u4e8b\u52a1\u5c31\u80fd\u751f\u6548\u4e86\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u4ee3\u7406\u5bf9\u8c61\u662fSpring\u521b\u5efa\u7684\u561b\uff0c\u6240\u4ee5\u5b83\u662f\u5e26\u6709\u4e8b\u52a1\u7684\u8fd9\u6837\u4e00\u4e2a\u51fd\u6570\u554a\u3002\u90a3\u73b0\u5728\u4e0d\u5b58\u5728\u7684\u539f\u56e0\u662f\u56e0\u4e3a\u4ec0\u4e48\u5462\uff1f\u56e0\u4e3a\u8fd9\u4e2a\u63a5\u53e3\u91cc\u662f\u4e0d\u5b58\u5728\u8fd9\u4e2a\u51fd\u6570\u7684\uff0c\u6211\u4eec\u73b0\u5728\u662f\u5728\u5b9e\u73b0\u7c7b\u91cc\u505a\u7684\u5bf9\u5427\uff1f\u6240\u4ee5\uff0c\u4f60\u628a\u8fd9\u4e2a\u51fd\u6570\u4e5f\u7ed9\u5b83\u521b\u5efa\u4e00\u4e0b\uff0c\u521b\u5efa\u5230\u6211\u4eec\u7684`IVoucherOrderService`\u63a5\u53e3\u91cc\uff0c\u90a3\u73b0\u5728\u63a5\u53e3\u91cc\u6709\u4e86\uff0c\u6211\u4eec\u624d\u80fd\u591f\u57fa\u4e8e\u63a5\u53e3\u7684\u8c03\u7528\u561b\uff0c\u90a3\u73b0\u5728\u8fd9\u4e2a\u4e8b\u52a1\u5c31\u80fd\u751f\u6548\u4e86\u3002<\/p>\n\n\n\n
\u9ed1\u9a6cSpringWeb\u7684AOP\uff1a\u4e8b\u52a1\u662f\u57fa\u4e8eAOP\u5b9e\u73b0 AOP\u4f1a\u5c06\u76ee\u6807\u5bf9\u8c61\u65b9\u6cd5\u589e\u5f3a\uff08\u5728\u539f\u65b9\u6cd5\u524d\u9762\u52a0\u4e0a\u5f00\u542f\u4e8b\u52a1 \u540e\u9762\u52a0\u4e0a\u63d0\u4ea4\uff09\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u4ee3\u7406\u5bf9\u8c61\u653e\u5230bean\u4e2d \u6240\u4ee5\u53ea\u6709\u4ee3\u7406\u5bf9\u8c61\u6709\u4e8b\u52a1\u529f\u80fd \u800c\u539f\u5bf9\u8c61\u6ca1\u6709<\/p>\n\n\n\n
Long userId = UserHolder.getUser().getId();\n synchronized (userId.toString().intern()) {\n IVoucherOrderService proxy= (IVoucherOrderService) AopContext.currentProxy();\n return proxy.createVoucherOrder(voucherId);\n }\n }\n\n\/\/\u8bb0\u5f97\u5728service\u91cc\u52a0\u4e00\u4e0b<\/code><\/pre>\n\n\n\npom\u4e2d\u6dfb\u52a0\u4f9d\u8d56<\/p>\n\n\n\n
<dependency>\n <groupId>org.aspectj<\/groupId>\n <artifactId>aspectjweaver<\/artifactId>\n<\/dependency><\/pre>\n\n\n\n
\u4e3a\u542f\u52a8\u7c7b\u66b4\u9732\u8fd9\u4e2a\u4ee3\u7406\u5bf9\u8c61\uff0c\u9ed8\u8ba4\u662f\u4e0d\u66b4\u9732\u7684<\/p>\n\n\n\n
@MapperScan(\"com.hmdp.mapper\")\n@SpringBootApplication\n@EnableAspectJAutoProxy(exposeProxy=true)\npublic class HmDianPingApplication {\n public static void main(String[] args) {\n SpringApplication.run(HmDianPingApplication.class, args);\n }\n}<\/pre>\n\n\n\n\u6216\u8005\u5728\u6210\u5458\u53d8\u91cf\u4e2d\u76f4\u63a5\u6ce8\u5165\u81ea\u5df1\uff0c\u901a\u8fc7\u6ce8\u5165\u81ea\u5df1\u7684\u5bf9\u8c61\u53bb\u8c03\u7528\u4e8b\u52a1<\/p>\n\n\n\n
\u00a0\u91cd\u65b0\u8fd0\u884c
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/f462d1d2a7b04187b5af3ce9012eadbb.png\")
\u6210\u529f\u53ea\u5356\u51fa\u4e00\u5f20\u7968![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/8a879d9f66e44ebf8dbeea4f2b19266e.png\")
<\/p>\n\n\n\nctrl+D\u590d\u5236\u4e00\u4efd\uff0c \u9009\u62e9\u6dfb\u52a0\u865a\u62df\u673a\u9009\u9879\uff0c\u5c31\u662fjvm\uff0c\u662f\u89c6\u9891\u91ccenvironment\u7684vm options<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/656b7b99fa474abd995fcff0cd1059ca.png\")
<\/p>\n\n\n\n\u53ef\u4ee5\u6539\u4e0b\u540d\u5b57\uff0c\u5b9e\u73b0\u4e24\u4e2a\u4e24\u4e2a
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/a520b6184ec04d87b8d0640ca9f79a39.png\")
<\/p>\n\n\n\n\u4fee\u6539nginx\u4e0b\u9762\u7684nginx.conf<\/p>\n\n\n\n
proxy_pass_request_headers on;\n #more_clear_input_headers Accept-Encoding; \n proxy_next_upstream error timeout; \n #proxy_pass http:\/\/127.0.0.1:8081;\n proxy_pass http:\/\/backend;\n }\n }\n\n upstream backend {\n server 127.0.0.1:8081 max_fails=5 fail_timeout=10s weight=1;\n server 127.0.0.1:8082 max_fails=5 fail_timeout=10s weight=1;\n } \n}<\/code><\/pre>\n\n\n\n\u9700\u8981\u628a\u8fd9\u91cc\u768443\u884c\u6253\u5f00\uff0c42\u884c\u6ce8\u91ca\u6389\uff0c\u7136\u540e\u53bb\u628a\u4efb\u52a1\u7ba1\u7406\u5668\u7684\u6240\u6709ngix\u7684\u8fdb\u7a0b\u901a\u901a\u6740\u6b7b\uff0c\u7136\u540e\u518d\u91cd\u542f\u670d\u52a1\u3002<\/p>\n\n\n\n
nginx.exe -s reload<\/code><\/pre>\n\n\n\n![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/f6a612ed4a344c3096f95d7dc56fe7fd.png\")
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/eb092a6c74c24075804410b679764ee4.png\")
<\/p>\n\n\n\n\u662f\u7684\uff0c\u4e0d\u540c\u7aef\u53e3\u4e0d\u65ad\u53d1\u9001\uff0csql\u4e2d\u4f18\u60e0\u5377\u6062\u590d\u539f\u8c8c\uff0c\u6253\u4e0a\u65ad\u70b9
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/d37ca4380d0d42e0a6573d3e74e3afaa.png\")
<\/p>\n\n\n\n\u540c\u4e00\u4e2a\u7528\u6237\u8fd9\u91cc\u6709\u4e00\u4e2a\u5e76\u53d1\u9501\u7684\u63a7\u5236\uff0c\u53ea\u80fd\u4e00\u4e2a\u7528\u6237\u8fdb\u6765\uff0c\u73b0\u5728\u6211\u4eec\u6253\u5f00\u6211\u4eec\u7684postman<\/p>\n\n\n\n
\u4e24\u53f0tomcat\uff0c\u4e24\u4e2ajvm\uff0c\u4e24\u4e2a\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\uff0c\u4e24\u628a\u9501\uff0c\u5f53\u7136\u90fd\u8fdb\u6765\u4e86 <\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/03088be5ee76474788b7a05ca55f33c6.png\")
<\/p>\n\n\n\n\u73b0\u5728\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0b\uff0c\u5728\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4e4b\u524d\u662f\u600e\u4e48\u505a\u7684\u3002\u4e4b\u524d\u6211\u4eec\u662f\u4e0d\u662f\u5355\u4f53\u9879\u76ee\uff1f\u6211\u4eec\u5047\u8bbe\u628a\u8fd9\u4e2a\u7070\u8272\u7684\u6846\u5f53\u6210\u6211\u4eec\u7684\u4e00\u4e2a\u5355\u4f53\u9879\u76ee\u3002\u7136\u540e\u6211\u4eec\u542f\u52a8\u4ee5\u540e\uff0c\u5176\u4e2d\u6709\u4e00\u4e2a\u7ebf\u7a0b\u6765\u67e5\u8be2\u8ba2\u5355\uff0c\u7136\u540e\u8fd9\u4e2a\u65f6\u5019\u67e5\u5b8c\u4e86\u4ee5\u540e\uff0c\u4ed6\u53bb\u5224\u65ad\u4e00\u4e0b\u8fd9\u4e2a\u8ba2\u5355\u662f\u5426\u5b58\u5728\u3002\u5982\u679c\u8bf4\u4e0d\u5b58\u5728\uff0c\u4ed6\u5c31\u4f1a\u53bb\u63d2\u5165\u8fd9\u4e2a\u65b0\u8ba2\u5355\u3002\u4ed6\u6267\u884c\u5b8c\u4e86\u4ee5\u540e\uff0c\u53e6\u5916\u4e00\u4e2a\u7ebf\u7a0b\u6765\u67e5\u8be2\uff0c\u67e5\u8be2\u5b8c\u4e86\u4ee5\u540e\uff0c\u56e0\u4e3a\u8fd9\u8fb9\u5df2\u7ecf\u63d2\u5165\u4e86\uff0c\u6240\u4ee5\u8bf4\u8fd9\u4e2a\u67e5\u8be2\u4ed6\u518d\u53bb\u5224\u65ad\u7684\u65f6\u5019\u662f\u5426\u5b58\u5728\uff0c\u80af\u5b9a\u662f\u5b58\u5728\u7684\uff0c\u662f\u4e0d\u662f\u5c31\u62a5\u9519\u554a\uff0c\u65e0\u6cd5\u63d2\u5165\u3002\u8fd9\u662f\u6b63\u5e38\u4e32\u884c\u6267\u884c\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n
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\u6211\u4eec\u5df2\u7ecf\u53d1\u73b0\u5728\u96c6\u7fa4\u6a21\u5f0f\u4e0b\uff0c`synchronized`\u7684\u9501\u5931\u6548\u4e86\u3002`synchronized`\u554a\uff0c\u5b83\u53ea\u80fd\u591f\u4fdd\u8bc1\u5355\u4e2aJVM\u5185\u90e8\u7684\u591a\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u7684\u4e92\u65a5\uff0c\u800c\u6ca1\u6709\u529e\u6cd5\u8ba9\u6211\u4eec\u96c6\u7fa4\u4e0b\u7684\u591a\u4e2aJVM\u8fdb\u7a0b\u4e4b\u95f4\u4e92\u65a5\u3002\u90a3\u8981\u60f3\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u5fc5\u987b\u4f7f\u7528\u5206\u5e03\u5f0f\u9501\u3002\u6240\u4ee5\u8fd9\u8282\u8bfe\u5462\uff0c\u6765\u5206\u6790\u4e00\u4e0b\u5206\u5e03\u5f0f\u9501\u7684\u5de5\u4f5c\u539f\u7406\uff0c\u5f53\u7136\u4e5f\u4f1a\u52a8\u624b\u53bb\u5b9e\u8df5\u4e00\u4e2a\u5206\u5e03\u5f0f\u9501\u3002<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/ac56f622c69f4ce486d2e8f076e3cd68.png\")
<\/p>\n\n\n\n\u597d\uff0c\u4e0b\u9762\u5462\u6211\u4eec\u5148\u6765\u5206\u6790\u4e00\u4e0b\u5206\u5e03\u5f0f\u9501\u7684\u5de5\u4f5c\u539f\u7406\u3002\u90a3\u8fd9\u91cc\u5462\u6709\u4e24\u4e2aJVM\u3002`synchronized`\u554a\uff0c\u5c31\u662f\u5229\u7528JVM\u5185\u90e8\u7684\u9501\u76d1\u89c6\u5668\u6765\u63a7\u5236\u7ebf\u7a0b\u7684\u3002\u5728JVM\u7684\u5185\u90e8\uff0c\u56e0\u4e3a\u53ea\u6709\u4e00\u4e2a\u9501\u76d1\u89c6\u5668\uff0c\u6240\u4ee5\u53ea\u4f1a\u6709\u4e00\u4e2a\u7ebf\u7a0b\u83b7\u53d6\u9501\uff0c\u53ef\u4ee5\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u7684\u4e92\u65a5\u3002\u4f46\u662f\u5f53\u6709\u591a\u4e2aJVM\u7684\u65f6\u5019\u5462\uff0c\u5c31\u4f1a\u6709\u591a\u4e2a\u9501\u76d1\u89c6\u5668\uff0c\u90a3\u4e48\u5c31\u4f1a\u6709\u591a\u4e2a\u7ebf\u7a0b\u83b7\u53d6\u5230\u9501\uff0c\u90a3\u8fd9\u6837\u5462\u5c31\u6ca1\u6709\u529e\u6cd5\u5b9e\u73b0\u591aJVM\u8fdb\u7a0b\u4e4b\u95f4\u7684\u4e92\u65a5\u4e86\u3002\u90a3\u8981\u60f3\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u80af\u5b9a\u4e0d\u80fd\u518d\u53bb\u4f7f\u7528JVM\u5185\u90e8\u7684\u9501\u76d1\u89c6\u5668\u4e86\u5427\uff0c\u6211\u4eec\u5fc5\u987b\u8ba9\u591a\u4e2aJVM\u90fd\u53bb\u4f7f\u7528\u540c\u4e00\u4e2a\u9501\u76d1\u89c6\u5668\u3002\u90a3\u56e0\u6b64\u5462\uff0c\u5b83\u4e00\u5b9a\u662f\u4e00\u4e2a\u5728JVM\u5916\u90e8\u7684\u3001\u591a\u4e2aJVM\u8fdb\u7a0b\u90fd\u53ef\u4ee5\u770b\u5230\u7684\u8fd9\u6837\u4e00\u4e2a\u9501\u76d1\u89c6\u5668\u3002\u8fd9\u4e2a\u65f6\u5019\u5462\uff0c\u65e0\u8bba\u662f\u5355\u4e2aJVM\u5185\u90e8\u7684\u7ebf\u7a0b\uff0c\u8fd8\u662f\u591a\u4e2aJVM\u7684\u7ebf\u7a0b\uff0c\u90fd\u5e94\u8be5\u6765\u627e\u8fd9\u4e2a\u76d1\u89c6\u5668\u6765\u83b7\u53d6\u9501\u3002\u90a3\u8fd9\u6837\u5462\u4e5f\u5c31\u53ea\u4f1a\u6709\u4e00\u4e2a\u7ebf\u7a0b\u83b7\u53d6\u5230\u5c31\u80fd\u591f\u5b9e\u73b0\u591a\u8fdb\u7a0b\u4e4b\u95f4\u7684\u4e92\u65a5\u4e86\u3002<\/p>\n\n\n\n
\u597d\uff0c\u90a3\u6211\u4eec\u6765\u5206\u6790\u4e00\u4e0b\u8fd9\u4e2a\u8fc7\u7a0b\u3002\u73b0\u5728\u5462\u5047\u8bbe\u6211\u4eec\u7684\u8fd9\u4e2aJVM1\u91cc\u8fb9\u7684\u7ebf\u7a0b\u4e00\u6765\u53bb\u6267\u884c\u4e1a\u52a1\uff0c\u90a3\u80af\u5b9a\u8981\u53bb\u83b7\u53d6\u9501\u3002\u8fd9\u65f6\u5019\u4ed6\u6765\u83b7\u53d6\u5462\uff0c\u5c31\u662f\u627e\u6211\u4eec\u8fd9\u4e2a\u5916\u90e8\u7684\u9501\u76d1\u89c6\u5668\u3002\u4e00\u65e6\u83b7\u53d6\u6210\u529f\uff0c\u5c31\u4f1a\u53bb\u8bb0\u5f55\u5f53\u524d\u83b7\u53d6\u7684\u662f\u8fd9\u4e2a\u7ebf\u7a0b\u4e00\u3002\u90a3\u7d27\u63a5\u7740\u5462\uff0c\u6b64\u65f6\u5982\u679c\u6709\u5176\u4ed6\u7ebf\u7a0b\u4e5f\u6765\u83b7\u53d6\u9501\uff0c\u6bd4\u65b9\u8bf4\u662f\u5728JVM2\u5185\u90e8\u7684\u4e00\u4e2a\u7ebf\u7a0b\u4e09\uff0c\u90a3\u4e48\u5b83\u7ebf\u7a0b\u4e09\u6765\u83b7\u53d6\u9501\u3002\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\u5462\uff0c\u56e0\u4e3a\u9501\u76d1\u89c6\u5668\u91cc\u5df2\u7ecf\u6709\u7ebf\u7a0b\u4e00\u6301\u6709\u4e86\uff0c\u6240\u4ee5\u7ebf\u7a0b\u4e09\u83b7\u53d6\u4e00\u5b9a\u4f1a\u5931\u8d25\u3002\u90a3\u5931\u8d25\u4e86\u4ed6\u8981\u600e\u4e48\u529e\u5462\uff1f\u90a3\u5b83\u4e00\u65e6\u5931\u8d25\uff0c\u80af\u5b9a\u8981\u53bb\u7b49\u5f85\u9501\u91ca\u653e\uff0c\u662f\u4e0d\u662f\u554a\uff1f\u6240\u4ee5\u5462\u4ed6\u5c31\u4e0d\u505c\u5730\u7b49\u5f85\u3002\u90a3\u8fd9\u4e2a\u65f6\u5019\u5462\uff0c\u6211\u4eec\u7684\u7ebf\u7a0b\u4e00\u83b7\u53d6\u9501\u6210\u529f\u4e86\uff0c\u4ed6\u5c31\u53ef\u4ee5\u53bb\u6267\u884c\u81ea\u5df1\u7684\u4e1a\u52a1\u4ee3\u7801\u4e86\u3002\u6bd4\u65b9\u8bf4\uff0c\u4ed6\u4e0b\u9762\u8981\u53bb\u67e5\u8be2\u8ba2\u5355\uff0c\u56e0\u4e3a\u4e00\u4eba\u4e00\u5355\u8981\u505a\u5224\u65ad\uff0c\u5224\u65ad\u4e00\u4e0b\u8fd9\u4e2a\u8ba2\u5355\u662f\u5426\u5b58\u5728\u3002\u5982\u679c\u8bf4\u5b83\u4e0d\u5b58\u5728\uff0c\u90a3\u73b0\u5728\u4ed6\u662f\u7b2c\u4e00\u4e2a\u6765\u7684\uff0c\u80af\u5b9a\u4e0d\u5b58\u5728\u3002\u90a3\u8fd9\u4e2a\u65f6\u5019\u4ed6\u5c31\u53ef\u4ee5\u53bb\u63d2\u5165\u65b0\u8ba2\u5355\u4e86\u3002\u597d\uff0c\u90a3\u4e48\u63d2\u5165\u4e4b\u540e\u4ed6\u7684\u4e1a\u52a1\u5b8c\u6210\uff0c\u4ed6\u5c31\u53ef\u4ee5\u53bb\u91ca\u653e\u9501\u4e86\u3002\u5f53\u7136\u4e86\uff0c\u6b64\u65f6\u7528\u6237\u5df2\u7ecf\u6709\u8fd9\u4e2a\u8ba2\u5355\u4e86\u3002\u6240\u4ee5\u4ed6\u91ca\u653e\u5b8c\u4e86\u4ee5\u540e\u5462\uff0c\u8fd9\u8fb9\u7684\u7ebf\u7a0b\u4e09\u4ed6\u62ff\u5230\u9501\u4e86\u3002\u8fd9\u4e2a\u65f6\u5019\u4ed6\u53bb\u6267\u884c\u4e1a\u52a1\uff0c\u83b7\u53d6\u9501\u6210\u529f\uff0c\u6267\u884c\u4e1a\u52a1\uff0c\u67e5\u8be2\u3002\u90a3\u4ed6\u67e5\u8be2\u7684\u65f6\u5019\u5462\uff0c\u56e0\u4e3a\u5bf9\u65b9\u5df2\u7ecf\u63d2\u5165\u4e86\uff0c\u4ed6\u4e00\u5b9a\u80fd\u591f\u67e5\u8be2\u5230\u3002\u67e5\u8be2\u5230\u4ee3\u8868\u5b58\u5728\uff0c\u5b58\u5728\u5c31\u4e0d\u80fd\u53bb\u63d2\u5165\u4e86\uff0c\u6240\u4ee5\u5c31\u62a5\u9519\u4e86\u3002\u6240\u4ee5\u8fd9\u6837\u662f\u4e0d\u662f\u5c31\u907f\u514d\u4e86\u8fd9\u79cd\u5b89\u5168\u95ee\u9898\u7684\u53d1\u751f\u5462\uff1f\u800c\u4e14\u5462\uff0c\u8fd9\u4e2a\u65f6\u5019\u4e0d\u4ec5\u4ec5\u662f\u7ebf\u7a0b\u4e09\uff0c\u90a3\u4e48\u4e0d\u7ba1\u662f\u6211\u4eecJVM\u5185\u90e8\u7684\u7ebf\u7a0b\uff0c\u8fd8\u662f\u591a\u4e2aJVM\u7684\u7ebf\u7a0b\uff0c\u6bd4\u5982\u8bf4\u65b0\u589e\u7684\u7ebf\u7a0b\u56db\u5176\u5b9e\u90fd\u662f\u4e00\u6837\u7684\u3002\u53ea\u8981\u5728\u7ebf\u7a0b\u4e00\u83b7\u53d6\u9501\u6210\u529f\u4ee5\u540e\uff0c\u4ed6\u4eec\u6765\u83b7\u53d6\u80af\u5b9a\u90fd\u662f\u5931\u8d25\u7684\uff0c\u56e0\u4e3a\u4ed6\u4eec\u90fd\u662f\u627e\u540c\u4e00\u4e2a\u9501\u76d1\u89c6\u5668\u561b\uff0c\u6240\u4ee5\u4ed6\u4eec\u90fd\u4f1a\u83b7\u53d6\u5931\u8d25\uff0c\u90a3\u4e48\u90fd\u4f1a\u51fa\u73b0\u4e00\u4e2a\u963b\u585e\u7b49\u5f85\uff0c\u5c31\u8ddf\u7ebf\u7a0b\u4e09\u4e00\u6837\u3002\u6240\u4ee5\u5462\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u80fd\u591f\u5b9e\u73b0\u4ec0\u4e48\u5462\uff1f\u65e0\u8bba\u662f\u5355\u4e2aJVM\u5185\u90e8\u7684\u7ebf\u7a0b\uff0c\u8fd8\u662f\u8de8JVM\u7684\u7ebf\u7a0b\uff0c\u90fd\u53ef\u4ee5\u8fbe\u5230\u4e00\u4e2a\u4e92\u65a5\u6548\u679c\u3002\u597d\uff0c\u8fd9\u5c31\u662f\u5206\u5e03\u5f0f\u9501\u7684\u4e00\u4e2a\u5de5\u4f5c\u539f\u7406\uff0c\u5176\u5b9e\u8fd8\u662f\u975e\u5e38\u7b80\u5355\u7684\u5427\u3002\u6240\u4ee5\u5b83\u6700\u5173\u952e\u7684\u70b9\u5c31\u662f\u4ec0\u4e48\uff1f\u4e00\u5b9a\u8981\u8ba9\u591a\u4e2aJVM\u8fdb\u7a0b\u90fd\u80fd\u591f\u770b\u5230\u540c\u4e00\u4e2a\u9501\u76d1\u89c6\u5668\uff0c\u4e5f\u5c31\u662f\u591a\u8fdb\u7a0b\u53ef\u89c1\uff0c\u6700\u540e\u5462\u8fd8\u8981\u4e92\u65a5\uff0c\u4e5f\u5c31\u662f\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u62ff\u5230\u9501\u3002<\/p>\n\n\n\n
mysql zookeeper \u90fd\u53ef\u4ee5\u505a\u5206\u5e03\u5f0f\u9501 \u53ea\u8981\u662f\u72ec\u7acb\u4e8ejvm\u7684 \u90fd\u53ef\u4ee5<\/p>\n\n\n\n
\u5206\u5e03\u5f0f\u9501 <\/h3>\n\n\n\n
\u5206\u5e03\u5f0f\u9501\uff1a\u6ee1\u8db3\u5206\u5e03\u5f0f\u7cfb\u7edf\u6216\u96c6\u7fa4\u6a21\u5f0f\u4e0b\u591a\u8fdb\u7a0b\u53ef\u89c1\u5e76\u4e14\u4e92\u65a5\u7684\u9501\u3002\u5206\u5e03\u5f0f\u9501\u7684\u6838\u5fc3\u662f\u5b9e\u73b0\u591a\u8fdb\u7a0b\u4e4b\u95f4\u4e92\u65a5\uff0c\u800c\u6ee1\u8db3\u8fd9\u4e00\u70b9\u7684\u65b9\u5f0f\u6709\u5f88\u591a\uff0c\u5e38\u89c1\u7684\u6709\u4e09\u79cd\uff1a<\/p>\n\n\n\n
<\/td> MySQL<\/td> Redis<\/td> Zookeeper<\/td><\/tr> \u4e92\u65a5<\/td> \u5229\u7528mysql\u672c\u8eab\u7684\u4e92\u65a5\u9501\u673a\u5236<\/td> \u5229\u7528setnx\u8fd9\u6837\u7684\u4e92\u65a5\u547d\u4ee4<\/td> \u5229\u7528\u8282\u70b9\u7684\u552f\u4e00\u6027\u548c\u6709\u5e8f\u6027\u5b9e\u73b0\u4e92\u65a5<\/td><\/tr> \u9ad8\u53ef\u7528<\/td> \u597d<\/td> \u597d<\/td> \u597d<\/td><\/tr> \u9ad8\u6027\u80fd<\/td> \u4e00\u822c<\/td> \u597d<\/td> \u4e00\u822c<\/td><\/tr> \u5b89\u5168\u6027<\/td> \u65ad\u5f00\u8fde\u63a5\uff0c\u81ea\u52a8\u91ca\u653e\u9501<\/td> \u5229\u7528\u9501\u8d85\u65f6\u65f6\u95f4\uff0c\u5230\u671f\u91ca\u653e<\/td> \u4e34\u65f6\u8282\u70b9\uff0c\u65ad\u5f00\u8fde\u63a5\u81ea\u52a8\u91ca\u653e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \u597d\u7684\u540c\u5b66\u4eec\uff0c\u90a3\u6bd4\u8f83\u5e38\u89c1\u7684\u5206\u5e03\u5f0f\u9501\u5b9e\u73b0\u65b9\u5f0f\u4e3b\u8981\u6709\u8fd9\u4e48\u4e09\u5927\u7c7b\u5427\u3002\u7b2c\u4e00\u7c7b\u662f\u4f7f\u7528MySQL\uff0c\u6216\u8005\u8bf4\u4f7f\u7528\u6570\u636e\u5e93\u6765\u5b9e\u73b0\uff1b\u7b2c\u4e8c\u7c7b\u662f\u4f7f\u7528Redis\u6765\u5b9e\u73b0\uff0c\u4e5f\u5c31\u662f\u7c7b\u4f3c\u4e8e\u8fd9\u79cd\u7f13\u5b58\u7684\uff1b\u7b2c\u4e09\u7c7b\u5c31\u662f\u4f7f\u7528ZooKeeper\u8fd9\u6837\u7684\u4e1c\u897f\u6765\u5b9e\u73b0\u3002\u8fd9\u4e2a\u4e1c\u897f\u6709\u4e9b\u540c\u5b66\u53ef\u80fd\u6ca1\u5b66\u8fc7\uff0c\u4f46\u4e0d\u91cd\u8981\uff0c\u56e0\u4e3a\u4eca\u5929\u6211\u4eec\u7684\u91cd\u70b9\u662f\u57fa\u4e8eRedis\u6765\u5b9e\u73b0\u3002\u6211\u4eec\u5148\u6765\u5206\u6790\u4e00\u4e0b\u8fd9\u4e09\u79cd\u5b9e\u73b0\u65b9\u5f0f\u5728\u4e92\u65a5\u3001\u9ad8\u53ef\u7528\u3001\u9ad8\u6027\u80fd\u548c\u5b89\u5168\u6027\u4e0a\u7684\u4e00\u4e9b\u5dee\u5f02\u3002<\/p>\n\n\n\n
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\u4e0d\u8fc7\u5462\uff0c\u8fd9\u4e2a\u9501\u7684\u91ca\u653e\u65f6\u95f4\u8bbe\u7f6e\u591a\u957f\u5462\uff1f\u5982\u679c\u592a\u957f\u4e86\uff0c\u90a3\u8fd9\u4e2a\u9501\u5440\u5b83\u7684\u65e0\u6548\u7b49\u5f85\u65f6\u95f4\u5c31\u4f1a\u6bd4\u8f83\u591a\uff1b\u90a3\u5982\u679c\u65f6\u95f4\u592a\u77ed\u4e86\uff0c\u90a3\u4e07\u4e00\u6211\u7684\u4e1a\u52a1\u8fd8\u6ca1\u6267\u884c\u5b8c\u5462\uff1f\u6240\u4ee5\u8bf4\u5462\u8fd9\u79cd\u65b9\u5f0f\u53bb\u505a\u5b89\u5168\u6027\u7684\u4e00\u4e2a\u4fdd\u8bc1\u662f\u53ef\u4ee5\u7684\uff0c\u4f46\u662f\u8fd8\u9700\u8981\u53bb\u5b8c\u5584\u3002\u5177\u4f53\u600e\u4e48\u89e3\u51b3\u5462\uff0c\u6211\u4eec\u5728\u540e\u7eed\u4f1a\u7ed9\u5927\u5bb6\u53bb\u8bb2\u3002<\/p>\n\n\n\n
\u8fd9\u662fRedis\uff0c\u90a3\u4e48\u8fd8\u6709\u6700\u540e\u4e00\u79cd\u5c31\u662fZooKeeper\u4e86\u3002ZooKeeper\u5462\uff0c\u5b83\u8fd9\u4e2a\u9501\u7684\u539f\u7406\u5176\u5b9e\u662f\u5229\u7528\u4e86\u5b83\u5185\u90e8\u7684\u8fd9\u79cd\u8282\u70b9\u673a\u5236\u3002ZooKeeper\u5185\u90e8\u662f\u53ef\u4ee5\u53bb\u521b\u5efa\u8fd9\u79cd\u6570\u636e\u8282\u70b9\u7684\uff0c\u800c\u8282\u70b9\u5177\u5907\u8fd9\u79cd\u552f\u4e00\u6027\u3001\u6709\u5e8f\u6027\uff0c\u53e6\u5916\u8fd8\u53ef\u4ee5\u521b\u5efa\u8fd9\u79cd\u4e34\u65f6\u8282\u70b9\u3002\u6240\u8c13\u7684\u552f\u4e00\u6027\u5c31\u662f\u6211\u4eec\u53bb\u521b\u5efa\u8282\u70b9\u7684\u65f6\u5019\uff0c\u8282\u70b9\u4e0d\u80fd\u91cd\u590d\u3002\u6240\u4ee5\u5b83\u6709\u5e8f\u6027\u5c31\u662f\u6bcf\u521b\u5efa\u4e00\u4e2a\u8282\u70b9\uff0c\u8282\u70b9\u7684ID\u5c31\u662f\u9012\u589e\u7684\u3002\u90a3\u5229\u7528\u8fd9\u4e2a\u7279\u6027\u600e\u4e48\u53bb\u83b7\u53d6\u9501\u5b9e\u73b0\u4e92\u65a5\u5462\uff1f\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8fd9\u4e2a\u6709\u5e8f\u6027\u6765\u5b9e\u73b0\u4e92\u65a5\u3002\u6bd4\u5982\u8bf4\u73b0\u5728\u6211\u4eec\u6709\u5f88\u591a\u7ebf\u7a0b\u90fd\u6765\u5728ZooKeeper\u91cc\u521b\u5efa\u8282\u70b9\uff0c\u7136\u540e\u8fd9\u6837\u4e00\u6765\uff0c\u6bcf\u4e00\u4e2a\u8282\u70b9\u5b83\u7684ID\u662f\u4e0d\u662f\u5c31\u662f\u5355\u8c03\u9012\u589e\u7684\uff1f\u90a3\u5982\u679c\u6211\u4eec\u7ea6\u5b9a\uff0cID\u6700\u5c0f\u7684\u90a3\u4e2a\u7b97\u662f\u83b7\u53d6\u9501\u6210\u529f\uff0c\u90a3\u8fd9\u6837\u4e00\u6765\u662f\u4e0d\u662f\u5c31\u5b9e\u73b0\u4e86\u4e92\u65a5\uff1f\u56e0\u4e3a\u6700\u5c0f\u7684\u662f\u4e0d\u662f\u53ea\u6709\u4e00\u4e2a\uff1f\u5f53\u7136\u4f60\u4e5f\u53ef\u4ee5\u5229\u7528\u552f\u4e00\u6027\uff0c\u6bd4\u5982\u8bf4\u5927\u5bb6\u90fd\u53bb\u521b\u5efa\u8282\u70b9\uff0c\u5e76\u4e14\u8fd9\u4e2a\u8282\u70b9\u540d\u79f0\u5927\u5bb6\u90fd\u662f\u4e00\u6837\u7684\uff0c\u8fd9\u6837\u6765\u662f\u4e0d\u662f\u53ea\u6709\u4e00\u4e2a\u4eba\u6210\u529f\uff1f\u6240\u4ee5\u4e5f\u53ef\u4ee5\uff0c\u4f46\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u90fd\u4f1a\u5229\u7528\u8fd9\u4e2a\u6709\u5e8f\u6027\u53bb\u5b9e\u73b0\u8fd9\u79cd\u4e92\u65a5\u3002<\/p>\n\n\n\n
\u90a3\u8fd9\u662f\u83b7\u53d6\u9501\uff0c\u91ca\u653e\u9501\u4e5f\u5f88\u7b80\u5355\u3002\u5c06\u6765\u5462\u4f60\u628a\u8282\u70b9\u5220\u9664\uff0c\u662f\u4e0d\u662f\u4f60\u5c31\u4e0d\u662f\u6700\u5c0f\u7684\uff0c\u53e6\u5916\u4e00\u4e2a\u4eba\u5c31\u53d8\u6210\u6700\u5c0f\u7684\u3002\u6240\u4ee5\u8fd9\u662f\u91ca\u653e\u9501\u3002\u6240\u4ee5ZooKeeper\u91cc\u9762\uff0c\u9501\u91ca\u653e\u9501\u8fd8\u662f\u6bd4\u8f83\u7b80\u5355\u7684\u3002<\/p>\n\n\n\n
\u90a3\u4ece\u53ef\u7528\u6027\u6765\u8003\u8651\u5462\uff0c\u5b83\u4e5f\u662f\u4e0d\u9519\u7684\uff0c\u56e0\u4e3aZooKeeper\u5929\u751f\u4e5f\u662f\u652f\u6301\u96c6\u7fa4\u7684\uff0c\u6240\u4ee5\u5b83\u7684\u53ef\u7528\u6027\u5f88\u597d\u3002\u800c\u6027\u80fd\u4e0a\u5462\uff0c\u56e0\u4e3aZooKeeper\u5b83\u7684\u96c6\u7fa4\u5f3a\u8c03\u7684\u662f\u5f3a\u7684\u4e00\u81f4\u6027\uff0c\u800c\u8fd9\u79cd\u5f3a\u7684\u4e00\u81f4\u6027\u90fd\u4f1a\u5bfc\u81f4\u5b83\u7684\u4e3b\u4ece\u4e4b\u95f4\u505a\u6570\u636e\u540c\u6b65\uff0c\u53bb\u6d88\u8017\u4e00\u5b9a\u7684\u65f6\u95f4\uff0c\u6240\u4ee5\u5b83\u7684\u6027\u80fd\u76f8\u5bf9\u6765\u8bb2\u662f\u6bd4Redis\u8981\u5dee\u4e00\u4e9b\u7684\u3002<\/p>\n\n\n\n
\u800c\u5b89\u5168\u6027\u6765\u8bb2\uff0c\u5b83\u505a\u5f97\u4e5f\u5f88\u597d\u3002\u56e0\u4e3a\u5b83\u7684\u8fd9\u4e9b\u8282\u70b9\u5f80\u5f80\u521b\u5efa\u7684\u662f\u4e34\u65f6\u8282\u70b9\uff0c\u8fd9\u4e2a\u65f6\u5019\u4e00\u65e6\u51fa\u73b0\u6545\u969c\uff0c\u6bd4\u5982\u8bf4\u670d\u52a1\u5b95\u673a\u4e86\uff0c\u90a3\u4e48\u65ad\u5f00\u8fde\u63a5\u4ee5\u540e\uff0c\u5b83\u7684\u8282\u70b9\u4f1a\u81ea\u52a8\u91ca\u653e\u6389\uff0c\u6240\u4ee5\u9501\u5c31\u7b49\u4e8e\u91ca\u653e\u4e86\u3002\u6240\u4ee5\u8fd9\u5757\u513f\u4e5f\u4e0d\u7528\u53bb\u8003\u8651\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u5176\u5b9e\u4ece\u5b89\u5168\u6027\u7684\u89d2\u5ea6\u6765\u8bb2\uff0cZooKeeper\u548cMySQL\u5b83\u4eec\u4e24\u4e2a\u539f\u7406\u57fa\u672c\u4e0a\u7c7b\u4f3c\uff0c\u5b89\u5168\u6027\u662f\u6bd4\u8f83\u597d\u7684\uff0c\u6bd4Redis\u6765\u8bb2\u8981\u7a0d\u5fae\u597d\u4e00\u4e9b\u3002Redis\u53ea\u80fd\u5229\u7528\u8fd9\u79cd\u8d85\u65f6\u673a\u5236\u53bb\u505a\u3002\u90a3\u4e48\u4f46\u662f\u5462\u4ece\u53ef\u7528\u6027\u548c\u6027\u80fd\u4e0a\u6765\u8bb2\uff0cRedis\u662f\u975e\u5e38\u597d\u7684\u3002\u90a3\u4e48\u56e0\u6b64\u5462\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u4f1a\u5e26\u7740\u5927\u5bb6\u53bb\u5b66\u4e60\u4e00\u4e0b\u5982\u4f55\u57fa\u4e8eRedis\u6765\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u3002\u90a3\u81f3\u4e8eMySQL\u548cZooKeeper\u7684\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u5728\u8fd9\u91cc\u5c31\u4e0d\u591a\u8bb2\u4e86\uff0c\u56e0\u4e3a\u6211\u4eec\u6574\u4e2a\u6559\u7a0b\u4e3b\u8981\u662f\u6765\u5b66\u4e60Redis\u7684\u3002\u90a3\u4e48\u5927\u5bb6\u5982\u679c\u6709\u5174\u8da3\uff0c\u4e5f\u53ef\u4ee5\u53bb\u7f51\u4e0a\u770b\u4e00\u770b\u5176\u4ed6\u4e24\u79cd\u65b9\u5f0f\u5b9e\u73b0\u7684\u4e00\u4e2a\u539f\u7406\u3002<\/p>\n\n\n\n
\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u65f6\u9700\u8981\u5b9e\u73b0\u7684\u4e24\u4e2a\u57fa\u672c\u65b9\u6cd5\uff1a
\u83b7\u53d6\u9501\uff1a
\u4e92\u65a5\uff1a\u786e\u4fdd\u53ea\u80fd\u6709\u4e00\u4e2a\u7ebf\u7a0b\u83b7\u53d6\u9501<\/p>\n\n\n\n#\u6dfb\u52a0\u9501\uff0c\u5229\u7528setnx\u7684\u4e92\u65a5\u7279\u6027\nSETNx lock thread1\n#\u6dfb\u52a0\u9501\u8fc7\u671f\u65f6\u95f4\uff0c\u907f\u514d\u670d\u52a1\u5ca9\u673a\u5f15\u8d77\u7684\u6b7b\u9501\nEXPIRE lock 10<\/code><\/pre>\n\n\n\n\u91ca\u653e\u9501\uff1a
\u624b\u52a8\u91ca\u653e
\u8d85\u65f6\u91ca\u653e\uff1a\u83b7\u53d6\u9501\u65f6\u6dfb\u52a0\u4e00\u4e2a\u8d85\u65f6\u65f6\u95f4<\/p>\n\n\n\n#\u91ca\u653e\u9501\uff0c\u5220\u9664\u5373\u53ef\nDEL key<\/code><\/pre>\n\n\n\n\u5b9e\u73b0\u771f\u6b63\u7684\u539f\u5b50\u6027\n#\u6dfb\u52a0\u9501\uff0cNX\u662f\u4e92\u65a5\u3001EX\u662f\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4\nSET lock thread1 NX EX 10<\/code><\/pre>\n\n\n\n\u975e\u963b\u585e\uff1a\u5c1d\u8bd5\u4e00\u6b21\uff0c\u6210\u529f\u8fd4\u56detrue\uff0c\u5931\u8d25\u8fd4\u56defalse<\/p>\n\n\n\n
Redis\u4f18\u5316\u79d2\u6740<\/h2>\n\n\n\n
\u57fa\u4e8eRedis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u521d\u7ea7\u7248\u672c<\/h3>\n\n\n\n
\u9700\u6c42\uff1a\u5b9a\u4e49\u4e00\u4e2a\u7c7b\uff0c\u5b9e\u73b0\u4e0b\u9762\u63a5\u53e3\uff0c\u5229\u7528Redis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u529f\u80fd\u3002<\/p>\n\n\n\n
\u5728utils\u5b9a\u4e49Ilock\u63a5\u53e3\u548cSimpleRedisLock\u7c7b<\/p>\n\n\n\n
package com.hmdp.utils;\n\npublic interface ILock {\n\n \/**\n * \u5c1d\u8bd5\u83b7\u53d6\u9501\n * @param timeoutSec \u9501\u6301\u6709\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u8fc7\u671f\u540e\u81ea\u52a8\u91ca\u653e\n * @return true\u4ee3\u8868\u83b7\u53d6\u9501\u6210\u529f; false\u4ee3\u8868\u83b7\u53d6\u9501\u5931\u8d25\n *\/\n boolean tryLock(long timeoutSec);\n\n \/**\n * \u91ca\u653e\u9501\n *\/\n void unlock();\n}\n<\/code><\/pre>\n\n\n\npackage com.hmdp.utils;\n\nimport org.springframework.data.redis.core.StringRedisTemplate;\n\nimport java.util.concurrent.TimeUnit;\n\npublic class SimpleRedisLock implements ILock {\n private String name;\/\/\u9501\u7684\u540d\u79f0,\u4f60\u53ef\u4ee5\u7ed9\u9501\u52a0\u4e00\u4e2a\u7edf\u4e00\u524d\u7f00\n private StringRedisTemplate stringRedisTemplate;\n public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {\n this.name = name;\n this.stringRedisTemplate = stringRedisTemplate;\n }\n\n private static final String KEY_PREFIX = \"lock:\";\n @Override\n public boolean tryLock(long timeoutSec) {\n \/\/\u83b7\u53d6\u7ebf\u7a0b\u6807\u8bc6\n long threadId = Thread.currentThread().getId();\n \/\/\u503c\u4e0d\u80fd\u968f\u4fbf\u8bbe\u7f6e\uff0c\u56e0\u4e3a\u4f1a\u6709\u7279\u6b8a\u60c5\u51b5\uff0c\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u5230\u5220\u9664\u9501\u4e4b\u524d\uff0ckey\u8fc7\u671f\u4e86\uff0c\n \/\/\u5176\u4ed6\u7ebf\u7a0b\u5c31\u8fdb\u6765\u6267\u884c\u64cd\u4f5c\uff0c\u8fd9\u6837\u5c31\u4f1a\u628a\u5176\u4ed6\u7ebf\u7a0b\u7684\u9501\u7ed9\u5220\u4e86\uff0c\u8fd9\u4e2a\u503c\u4f1a\u7528\u6765\u6bd4\u8f83\u662f\u5426\u662f\u8be5\u7ebf\u7a0b\u7684\u9501\u3002\u5177\u4f53\u53ef\u4ee5\u770b\u8c37\u7c92\u5546\u57cep158\n \/\/\u83b7\u53d6\u9501\n Boolean success =stringRedisTemplate.opsForValue().\n setIfAbsent(KEY_PREFIX+name,threadId+\"\",timeoutSec, TimeUnit.SECONDS);\n \/\/\u7531\u4e8e\u62c6\u7bb1\u4e0d\u80fd\u76f4\u63a5return\n return Boolean.TRUE.equals(success);\n }\n @Override\n public void unlock() {\n \/\/\u91ca\u653e\u9501\n stringRedisTemplate.delete(KEY_PREFIX+name);\n }\n}\n<\/code><\/pre>\n\n\n\n\u4fee\u6539 VoucherOrderServicelmpl.java\u4e2d\u673a\u5236\u6539\u4e3a\u81ea\u5df1\u5b9e\u73b0\u7684\u9501<\/p>\n\n\n\n
\/***************************************************\/\n \/\/4.\u5224\u65ad\u5e93\u5b58\u662f\u5426\u5145\u8db3\n if (voucher.getStock() < 1) {\n \/\/\u5e93\u5b58\u4e0d\u8db3\n return Result.fail(\"\u5e93\u5b58\u4e0d\u8db3\uff01\");\n }\n Long userId = UserHolder.getUser().getId();\n \/\/\u521b\u5efa\u9501\u5bf9\u8c61\n SimpleRedisLock lock=new SimpleRedisLock(\"ordere:\" +userId,stringRedisTemplate);\n \/\/\u83b7\u53d6\u9501\n boolean isLock=lock.tryLock(1200);\n if(!isLock){\n return Result.fail(\"\u4e0d\u80fd\u91cd\u590d\u4e0b\u5355\");\n }\n try {\n \/\/\u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61\uff08\u4e8b\u52a1\uff09\n IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();\n return proxy.createVoucherOrder(voucherId);\n }finally {\n \/\/\u91ca\u653e\u9501\n lock.unlock();\n }\/\/try finally \u4e8b\u52a1\u53ef\u4ee5\u751f\u6548\uff0c\u56e0\u4e3a\u6ca1\u6709\u6355\u83b7\u5f02\u5e38\u3002\u5982\u679ccatch\u6355\u83b7\u4e86\u5f02\u5e38\uff0c\u9700\u8981\u629b\u51faRuntimeException\u7c7b\u578b\u5f02\u5e38\uff0c\u4e0d\u7136\u4e8b\u52a1\u5931\u6548\u3002\n }\n\/*************************************************\/<\/code><\/pre>\n\n\n\n\u8981\u6bcf\u4e2a\u7528\u6237\u90fd\u80fd\u62ff\u5230\u81ea\u5df1\u7684\u9501\uff0c\u56e0\u4e3a\u8fd9\u91cc\u52a0\u9501\u7684\u76ee\u7684\u5c31\u662f\u4e3a\u4e86\u5b9e\u73b0\u4e00\u4eba\u4e00\u5355\uff0c\u8d85\u5356\u662f\u901a\u8fc7update\u81ea\u5e26\u7684\u884c\u9501\u89e3\u51b3\u7684\uff0c\u4e0d\u662f\u5206\u5e03\u5f0f\u9501\u89e3\u51b3\u7684\uff1b\u5982\u679c \u540c\u4e00\u4e2a\u4eba\u5728\u9501\u8fc7\u671f\u4e86\u4e4b\u540e\u518d\u6765\u4e0b\u5355\u4e0d\u662f\u53c8\u80fd\u91cd\u590d\u4e0b\u5355\u4e86\u561b\uff1f \u6240\u4ee5\u9501\u7684\u8fc7\u671f\u65f6\u95f4\u8981\u4e45\u4e00\u70b9<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/1a0a00feae0a409ab49076cdf3f1a2b6.png\")
<\/p>\n\n\n\n\u8fd9\u79cd\u60c5\u51b5\u662f\u540c\u4e00\u4e2a\u7528\u6237\u53d1\u4e86\u591a\u6b21\u8bf7\u6c42\u7684\u60c5\u51b5\u5427\uff0c\u5982\u679c\u662f\u4e0d\u540c\u7684\u7528\u6237\uff0c\u90a3\u4e48userId\u4e0d\u4e00\u6837\u7684\uff0c\u90a3\u4e48key\u5c31\u4e0d\u4e00\u6837\uff08\u6700\u4e3b\u8981\u662f\u56e0\u4e3a\u7ebf\u7a0b\u65e0\u6cd5\u5206\u6e05\u695a\u81ea\u5df1\u7684\u9501\uff09<\/p>\n\n\n\n
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![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/450d7929727c403c82ca371a565ec2df.png\")
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\u6539\u8fdbRedis\u7684\u5206\u5e03\u5f0f\u9501<\/h3>\n\n\n\n
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1\uff0e\u5728\u83b7\u53d6\u9501\u65f6\u5b58\u5165\u7ebf\u7a0b\u6807\u793a\uff08\u53ef\u4ee5\u7528UUID\u8868\u793a\uff09
2. \u5728\u91ca\u653e\u9501\u65f6\u5148\u83b7\u53d6\u9501\u4e2d\u7684\u7ebf\u7a0b\u6807\u793a\uff0c\u5224\u65ad\u662f\u5426\u4e0e\u5f53\u524d\u7ebf\u7a0b\u6807\u793a\u4e00\u81f4
\u5982\u679c\u4e00\u81f4\u5219\u91ca\u653e\u9501
\u5982\u679c\u4e0d\u4e00\u81f4\u5219\u4e0d\u91ca\u653e\u9501<\/p>\n\n\n\nSimpleRedisLock.java<\/p>\n\n\n\n
private static final String KEY_PREFIX = \"lock:\";\n private static final String ID_PREFIX = UUID.randomUUID().toString(true)+\"-\";\n @Override\n public boolean tryLock(long timeoutSec) {\n \/\/\u83b7\u53d6\u7ebf\u7a0b\u6807\u8bc6\n String threadId = ID_PREFIX + Thread.currentThread().getId();\n \/\/\u503c\u4e0d\u80fd\u968f\u4fbf\u8bbe\u7f6e\uff0c\u56e0\u4e3a\u4f1a\u6709\u7279\u6b8a\u60c5\u51b5\uff0c\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u5230\u5220\u9664\u9501\u4e4b\u524d\uff0ckey\u8fc7\u671f\u4e86\uff0c\n \/\/\u5176\u4ed6\u7ebf\u7a0b\u5c31\u8fdb\u6765\u6267\u884c\u64cd\u4f5c\uff0c\u8fd9\u6837\u5c31\u4f1a\u628a\u5176\u4ed6\u7ebf\u7a0b\u7684\u9501\u7ed9\u5220\u4e86\uff0c\u8fd9\u4e2a\u503c\u4f1a\u7528\u6765\u6bd4\u8f83\u662f\u5426\u662f\u8be5\u7ebf\u7a0b\u7684\u9501\u3002\u5177\u4f53\u53ef\u4ee5\u770b\u8c37\u7c92\u5546\u57cep158\n \/\/\u83b7\u53d6\u9501\n Boolean success =stringRedisTemplate.opsForValue().\n setIfAbsent(KEY_PREFIX+name,threadId,timeoutSec, TimeUnit.SECONDS);\n \/\/\u7531\u4e8e\u62c6\u7bb1\u4e0d\u80fd\u76f4\u63a5return\n return Boolean.TRUE.equals(success);\n }\n @Override\n public void unlock() {\n \/\/\u91ca\u653e\u9501\n \/\/\u8fd9\u91ccstatic\u4f1a\u4f7f\u540c\u4e00\u4e2ajvm\u7684\u6240\u6709\u7ebf\u7a0b\u7684uuid\u4e00\u6837\uff0c\u4f46\u662f\u7ebf\u7a0bid\u4e0d\u4e00\u6837\uff0c\u800c\u4e24\u4e2ajvm\u7684\u7ebf\u7a0bid\u6709\u53ef\u80fd\u76f8\u540c\uff0c\u4f46\u662fuuid\u4e0d\u4e00\u6837\n \/\/\u76f8\u540cjvm\u6709\u7ebf\u7a0b\u53f7id\u533a\u5206\uff0c\u4e0d\u540cjvm\u6709uuid\u533a\u5206\n \/\/\u83b7\u53d6\u7ebf\u7a0b\u6807\u793a\n String threadId=ID_PREFIX+Thread.currentThread().getId();\n \/\/\u83b7\u53d6\u9501\u4e2d\u7684\u6807\u793aI\n String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);\n \/\/\u5224\u65ad\u6807\u793a\u662f\u5426\u4e00\u81f4\n if(threadId.equals(id)) {\n stringRedisTemplate.delete(KEY_PREFIX + name);\n }\n }<\/code><\/pre>\n\n\n\nuuid\u662f\u533a\u5206\u4e0d\u540c\u670d\u52a1\u5668\u7684\uff0c\u7ebf\u7a0bid\u662f\u533a\u5206\u76f8\u540c\u670d\u52a1\u5668\u7684\uff0cstatic final\u7684\u529f\u80fd\u5c31\u662f\u8ba9\u540c\u4e00\u4e2aJVM\u8fdb\u7a0b\u53ea\u6709\u4e00\u4e2aUUID\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u901a\u8fc7UUID\u533a\u5206\u4e0d\u540c\u7684JVM\u8fdb\u7a0b\uff0c\u7528\u7ebf\u7a0bid\u533a\u5206\u76f8\u540cJVM\u8fdb\u7a0b\u4e0b\u7684\u7ebf\u7a0b<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/e510ef61a27742e2b90021255524b082.png\")
<\/p>\n\n\n\n\u90a3\u540c\u6837\u5462\uff0c\u662f\u524d\u9762\u8fd9\u4e2aRedis\u9501\u7684\u4e00\u4e2a\u5468\u671f\uff0c\u4e0b\u8fb9\u5462\u662f\u4e00\u4e2a\u7ebf\u7a0b\u3002\u6211\u4eec\u5047\u8bbe\u7ebf\u7a0b\u4e00\u4e0a\u6765\u53bb\u7533\u8bf7\u8fd9\u4e2a\u9501\uff0c\u56e0\u4e3a\u5c31\u4ed6\u81ea\u5df1\u561b\uff0c\u6240\u4ee5\u8fd9\u4e2a\u83b7\u53d6\u9501\u80af\u5b9a\u80fd\u591f\u6210\u529f\u3002\u4e8e\u662f\u4ed6\u5f00\u59cb\u6267\u884c\u81ea\u5df1\u7684\u4e1a\u52a1\u3002\u73b0\u5728\u6211\u4eec\u5047\u8bbe\u8fd9\u4e2a\u4e1a\u52a1\u5e76\u6ca1\u6709\u963b\u585e\u554a\uff0c\u4ed6\u6210\u529f\u6267\u884c\u5b8c\u4e86\u3002\u7d27\u63a5\u7740\u4ed6\u8981\u53bb\u91ca\u653e\u9501\u4e86\uff0c\u800c\u4e14\u91ca\u653e\u9501\u662f\u4e0d\u662f\u8981\u5148\u5224\u65ad\u9501\u6807\u8bc6\uff1f\u4e8e\u662f\u4ed6\u53bb\u5224\u65ad\u9501\u6807\u8bc6\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5224\u65ad\uff0c\u56e0\u4e3a\u9501\u662f\u4ed6\u81ea\u5df1\uff0c\u662f\u4e0d\u662f\u4e00\u5b9a\u662f\u6210\u529f\u7684\uff0c\u6240\u4ee5\u8fd4\u56de\u7684\u662fok\u554a\u3002<\/p>\n\n\n\n
\u597d\uff0c\u90a3\u4e48\u7d27\u63a5\u7740\u4ed6\u8981\u5e72\u4ec0\u4e48\u4e86\uff0c\u540c\u5b66\u4eec\uff1f\u7d27\u63a5\u7740\u662f\u4e0d\u662f\u8981\u6267\u884c\u91ca\u653e\u9501\u7684\u52a8\u4f5c\u4e86\uff1f\u540c\u5b66\u4eec\u6ce8\u610f\u4e86\uff0c\u5224\u65ad\u9501\u6807\u8bc6\u548c\u91ca\u653e\u9501\u662f\u4e24\u4e2a\u52a8\u4f5c\u554a\uff0c\u6240\u4ee5\u8bf4\u5462\u5224\u65ad\u662f\u6210\u529f\u4e86\uff0c\u7d27\u63a5\u7740\u8981\u91ca\u653e\u3002\u4f46\u662f\u5c31\u5728\u8981\u91ca\u653e\u65f6\u4ea7\u751f\u4e86\u963b\u585e\uff0c\u6709\u8fd9\u79cd\u53ef\u80fd\u6027\u5427\uff1f\u5509\uff0c\u6709\u7684\u4eba\u4f1a\u8bf4\u4e86\uff0c\u8fd9\u600e\u4e48\u4f1a\u963b\u585e\u5462\uff1f\u5224\u65ad\u5b8c\u4e86\u76f4\u63a5\u5c31\u662f\u91ca\u653e\u4e86\uff0c\u4e2d\u95f4\u53c8\u6ca1\u6709\u522b\u7684\u4ee3\u7801\uff0c\u4e3a\u4ec0\u4e48\u4f1a\u5835\u585e\u5462\uff1f\u554a\uff0c\u540c\u5b66\u4eec\u60f3\u60f3\u770b\u554a\uff0c\u5176\u5b9e\u5728JVM\u91cc\u6709\u4e00\u4e2a\u4e1c\u897f\u554a\uff0c\u53eb\u505a\u5783\u573e\u56de\u6536\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u6240\u4ee5\u5f53\u6211\u4eec\u7684JVM\u53bb\u505a\u8fd9\u79cd\u670d\u52a1\uff0c\u90a3\u4e48\u5b83\u5176\u5b9e\u662f\u4f1a\u963b\u585e\u6211\u4eec\u7684\u6240\u6709\u7684\u4ee3\u7801\uff0c\u6240\u4ee5\u8fd9\u4e2a\u65f6\u5019\u5c31\u4f1a\u4ea7\u751f\u963b\u585e\u3002\u4e0d\u662f\u56e0\u4e3a\u4f60\u7684\u4e1a\u52a1\u963b\u585e\uff0c\u662f\u56e0\u4e3a\u8fd9\u8fb9\u6211\u4eec\u672c\u8eab\u4ea7\u751f\u963b\u585e\uff0c\u662f\u6709\u8fd9\u79cd\u53ef\u80fd\u6027\u7684\u554a\u3002<\/p>\n\n\n\n
\u90a3\u4e00\u65e6\u53d1\u751f\u4e86\u963b\u585e\uff0c\u90a3\u4e5f\u5c31\u662f\u8bf4\u6211\u8f6e\u5230\u6211\u53bb\u91ca\u653e\u4e86\u554a\uff0c\u4f46\u662f\u6211\u88ab\u963b\u585e\u4e86\uff0c\u662f\u4e0d\u662f\u5c31\u6ca1\u6709\u91ca\u653e\u5440\uff1f\u800c\u8fd9\u4e2a\u963b\u585e\u7684\u65f6\u95f4\u5982\u679c\u8db3\u591f\u957f\uff0c\u5f88\u6709\u53ef\u80fd\u5c31\u89e6\u53d1\u4e86\u6211\u4eec\u90a3\u4e2a\u9501\u7684\u4e00\u4e2a\u8d85\u65f6\u91ca\u653e\u3002\u90a3\u4e48\u9501\u4e00\u65e6\u8d85\u65f6\u91ca\u653e\uff0c\u5176\u4ed6\u7684\u7ebf\u7a0b\u662f\u4e0d\u662f\u5c31\u53c8\u53ef\u4ee5\u8d81\u865a\u800c\u5165\u4e86\uff1f\u6bd4\u5982\u8bf4\u7ebf\u7a0b\u4e8c\uff0c\u4ed6\u5462\u5c31\u6765\u83b7\u53d6\u9501\uff0c\u90a3\u56e0\u4e3a\u8fd9\u4e2a\u9501\u88ab\u8d85\u65f6\u91ca\u653e\u6389\u4e86\uff0c\u4ed6\u662f\u4e0d\u662f\u53ef\u4ee5\u6210\u529f\u83b7\u53d6\uff1f\u4e8e\u662f\u4ed6\u5f00\u59cb\u6267\u884c\u81ea\u5df1\u7684\u4e1a\u52a1\u3002<\/p>\n\n\n\n
\u800c\u5c31\u5728\u4ed6\u83b7\u53d6\u9501\u6210\u529f\u7684\u90a3\u4e00\u523b\uff0c\u5982\u679c\u8bf4\u73b0\u5728GC\u7ed3\u675f\u4e86\uff0c\u90a3\u4e48\u963b\u585e\u7ed3\u675f\u6211\u4eec\u7684\u7ebf\u7a0b\u6062\u590d\u8fd0\u884c\uff0c\u800c\u6b64\u65f6\u4ed6\u53bb\u6267\u884c\u4ec0\u4e48\u52a8\u4f5c\uff1f\u54ce\uff0c\u6ca1\u9519\uff0c\u8981\u6267\u884c\u91ca\u653e\u9501\u7684\u52a8\u4f5c\u4e86\u3002\u56e0\u4e3a\u5224\u65ad\u662f\u4e0d\u662f\u5df2\u7ecf\u6267\u884c\u8fc7\u4e86\uff0c\u4ed6\u8ba4\u4e3a\u9501\u8fd8\u662f\u81ea\u5df1\u7684\uff0c\u4f46\u5176\u5b9e\u73b0\u5728\u9501\u662f\u81ea\u5df1\u7684\u5417\uff1f\u4e0d\u662f\uff0c\u5df2\u7ecf\u662f\u7ebf\u7a0b\u4e8c\u7684\u4e86\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u4f46\u662f\u5462\u5b83\u4e0d\u5224\u65ad\u4e86\uff0c\u56e0\u4e3a\u5df2\u7ecf\u5224\u65ad\u8fc7\u4e86\uff0c\u6240\u4ee5\u76f4\u63a5\u6267\u884c\u91ca\u653e\u9501\uff0c\u4e8e\u662f\u5c31\u628a\u7ebf\u7a0b\u4e8c\u7684\u9501\u7ed9\u5220\u6389\u4e86\uff0c\u53c8\u4e00\u6b21\u53d1\u751f\u4e86\u8bef\u5220\u3002\u90a3\u4e48\u6b64\u65f6\u53c8\u6765\u4e86\u4e2a\u7ebf\u7a0b\u4e09\uff0c\u8d81\u865a\u800c\u5165\uff0c\u83b7\u53d6\u9501\u6210\u529f\u6267\u884c\u81ea\u5df1\u7684\u4e1a\u52a1\u3002\u4f60\u770b\u8fd9\u79cd\u5e76\u53d1\u7684\u95ee\u9898\u662f\u4e0d\u662f\u53c8\u4e00\u6b21\u53d1\u751f\u4e86\uff1f<\/p>\n\n\n\n
\u6240\u4ee5\u540c\u5b66\u4eec\u8fd9\u4e00\u6b21\u4ea7\u751f\u7684\u539f\u56e0\u662f\u4ec0\u4e48\uff1f\u6211\u4eec\u505a\u4e86\u5224\u65ad\u4e86\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u90a3\u4e3a\u4ec0\u4e48\u53c8\u51fa\u95ee\u9898\u4e86\uff1f\u5509\uff0c\u5c31\u662f\u56e0\u4e3a\u5224\u65ad\u9501\u6807\u8bc6\u548c\u91ca\u653e\u662f\u4e24\u4e2a\u52a8\u4f5c\uff0c\u8fd9\u4e24\u4e2a\u52a8\u4f5c\u4e4b\u95f4\u4ea7\u751f\u4e86\u963b\u585e\uff0c\u6700\u540e\u51fa\u73b0\u4e86\u95ee\u9898\u3002\u90a3\u56e0\u6b64\u8981\u60f3\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\u7684\u53d1\u751f\uff0c\u6211\u4eec\u5fc5\u987b\u786e\u4fdd\u4ec0\u4e48\uff1f\u5fc5\u987b\u786e\u4fdd\u5224\u65ad\u9501\u6807\u8bc6\u7684\u52a8\u4f5c\u548c\u91ca\u653e\u9501\u7684\u52a8\u4f5c\u8fd9\u4e24\u4e2a\u5f97\u6210\u4e00\u4e2a\u539f\u5b50\u6027\u7684\u64cd\u4f5c\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e00\u8d77\u6267\u884c\u4e0d\u80fd\u51fa\u73b0\u95f4\u9694\u3002\u90a3\u6211\u4eec\u600e\u4e48\u6837\u4fdd\u8bc1\u4e24\u4e2a\u52a8\u4f5c\u7684\u539f\u5b50\u6027\u5462\uff1f\u662f\u9501\u7684\u503c\u4e0d\u4e00\u6837\u554a\uff0c\u4e0d\u662f\u9501\u7684\u952e\u4e0d\u4e00\u6837\u554a\uff0c\u9501\u540d\u79f0\u4e00\u6837\uff0c\u4f46\u662f\u9501\u7684\u7ebf\u7a0b\u6807\u8bc6\u4e0d\u4e00\u6837\u3002<\/p>\n\n\n\n
\u5b9e\u9645\u4e0a\u5c31\u662f\u7ebf\u7a0b1\u5224\u65ad\u540e\u53d1\u73b0\u9501\u7684\u7ebf\u7a0b\u6807\u8bc6\u548c\u5f53\u524d\u7ebf\u7a0b\u4e00\u6837\uff0c\u4e8e\u662f\u6839\u636e\u9501\u540d\u91ca\u653e\u9501\uff0c\u4f46\u662f\u4e1a\u52a1\u963b\u585e\uff0c\u9501\u8d85\u65f6\u91ca\u653e\uff0c\u7ebf\u7a0b2\u62ff\u5230\u540c\u6837\u540d\u79f0\u7684\u9501\uff0c\u7ebf\u7a0b1\u6839\u636e\u9501\u540d\u79f0\u628a\u7ebf\u7a0b2\u7684\u9501\u8bef\u5220\u4e86\u3002<\/strong><\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/f242c55b8f664ef08bb4602486aff53f.png\")
<\/p>\n\n\n\nlua\u811a\u672c<\/h3>\n\n\n\n
Redis\u63d0\u4f9b\u4e86Lua\u811a\u672c\u529f\u80fd\uff0c\u5728\u4e00\u4e2a\u811a\u672c\u4e2d\u7f16\u5199\u591a\u6761Redis\u547d\u4ee4\uff0c\u786e\u4fdd\u591a\u6761\u547d\u4ee4\u6267\u884c\u65f6\u7684\u539f\u5b50\u6027\u3002Lua\u662f\u4e00\u79cd\u7f16\u7a0b\u8bed\u8a00\uff0c\u5b83\u7684\u57fa\u672c\u8bed\u6cd5\u5927\u5bb6\u53ef\u4ee5\u53c2\u8003\u7f51\u7ad9\uff1ahttps:\/\/www.runoob.com\/lua\/lua-tutorial.html<\/p>\n\n\n\n
\u8fd9\u91cc\u91cd\u70b9\u4ecb\u7ecdRedis\u63d0\u4f9b\u7684\u8c03\u7528\u51fd\u6570\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a\n\n#\u6267\u884credis\u547d\u4ee4\nredis.call\uff08'\u547d\u4ee4\u540d\u79f0','key','\u5176\u5b83\u53c2\u6570', ...)\n\n\u4f8b\u5982\uff0c\u6211\u4eec\u8981\u6267\u884csetnamejack\uff0c\u5219\u811a\u672c\u662f\u8fd9\u6837\uff1a\n\n#\u6267\u884c setname jack\nredis.call('set','name','jack')\n\n\u4f8b\u5982\uff0c\u6211\u4eec\u8981\u5148\u6267\u884csetnameRose\uff0c\u518d\u6267\u884cgetname\uff0c\u5219\u811a\u672c\u5982\u4e0b\uff1a\n\n#\u5148\u6267\u884c setname jack\nredis.call('set','name','jack')\n#\u518d\u6267\u884cgetname\nlocal name = redis.call('get', 'name')\n#\u8fd4\u56de\nreturn name<\/code><\/pre>\n\n\n\n\u7406\u89e3\u6210java\u7684\u9762\u5411\u5bf9\u8c61\uff0c\u524d\u9762\u90a3\u4e2aredis\u5c31\u662f\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5bf9\u8c61<\/p>\n\n\n\n
\u5199\u597d\u811a\u672c\u4ee5\u540e\uff0c\u9700\u8981\u7528Redis\u547d\u4ee4\u6765\u8c03\u7528\u811a\u672c\uff0c\u8c03\u7528\u811a\u672c\u7684\u5e38\u89c1\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n\n\n\n
127.0.0.1:6379>help @scripting\n EVAL script numkeys key [key...] arg [arg...]\n summary:Execute a Lua script server side\n since: 2.6.0<\/code><\/pre>\n\n\n\n\u4f8b\u5982\uff0c\u6211\u4eec\u8981\u6267\u884credis.call('set'\uff0c'name'\uff0cjack\"\uff09\u8fd9\u4e2a\u811a\u672c\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a
#\u8c03\u7528\u811a\u672c
EVAL \"return redis.call('set','name'\uff0c'jack')\" 0
\u524d\u9762\u662f\u811a\u672c\u5185\u5bb9 0\u662f\u811a\u672c\u9700\u8981\u7684key\u7c7b\u578b\u7684\u53c2\u6570\u4e2a\u6570 <\/p>\n\n\n\n\u8fdb\u5165centos7\uff0c\u4f9d\u6b21\u8f93\u5165\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n\n\n\n
redis-cli\nAUTH 123321 #\u4f60\u7684\u5bc6\u7801\nEVAL \"return redis.call('set','name','Rose')\" 0\n\n\nkeys * # \u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2a\u770b\u4e00\u4e0b\u662f\u5426\u5f55\u5165<\/code><\/pre>\n\n\n\n\u5982\u679c\u811a\u672c\u4e2d\u7684key\u3001Value\u4e0d\u60f3\u5199\u6b7b\uff0c\u53ef\u4ee5\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u3002key\u7c7b\u578b\u53c2\u6570\u4f1a\u653e\u5165KEYS\u6570\u7ec4\uff0c\u5176\u5b83\u53c2\u6570\u4f1a\u653e\u5165ARGV\u6570\u7ec4\uff0c\u5728\u811a\u672c\u4e2d\u53ef\u4ee5\u4eceKEYS\u548cARGV\u6570\u7ec4\u83b7\u53d6\u8fd9\u4e9b\u53c2\u6570\uff1a<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/5ca33af3c94d4d6fac3bfd0bde2d2ebc.png\")
<\/p>\n\n\n\n\u91ca\u653e\u9501\u7684\u4e1a\u52a1\u6d41\u7a0b\u662f\u8fd9\u6837\u7684\uff1a
1.\u83b7\u53d6\u9501\u4e2d\u7684\u7ebf\u7a0b\u6807\u793a
2.\u5224\u65ad\u662f\u5426\u4e0e\u6307\u5b9a\u7684\u6807\u793a\uff08\u5f53\u524d\u7ebf\u7a0b\u6807\u793a\uff09\u4e00\u81f4
3.\u5982\u679c\u4e00\u81f4\u5219\u91ca\u653e\u9501\uff08\u5220\u9664\uff09
4.\u5982\u679c\u4e0d\u4e00\u81f4\u5219\u4ec0\u4e48\u90fd\u4e0d\u505a<\/p>\n\n\n\n-- \u83b7\u53d6\u9501\u4e2d\u7684\u7ebf\u7a0b\u6807\u793agetkey\nlocal id =redis.call('get',KEYS[1])\n--\u6bd4\u8f83\u7ebf\u7a0b\u6807\u793a\u4e0e\u9501\u4e2d\u7684\u6807\u793a\u662f\u5426\u4e00\u81f4\nif\uff08id ==ARGV[1]) then\n--\u91ca\u653e\u9501delkey\n\treturn redis.call('del', KEYS[1])\nend\nreturn 0<\/code><\/pre>\n\n\n\nlua\u518d\u6b21\u6539\u8fdbRedis\u7684\u5206\u5e03\u5f0f\u9501<\/h3>\n\n\n\n
Lua\u672c\u8eab\u4e0d\u5177\u5907\u539f\u5b50\u6027\u7684\uff0c\u662f\u56e0\u4e3aredis\u6267\u884c\u547d\u540d\u662f\u5355\u7ebf\u7a0b\u6267\u884c\u7684\uff0c\u5b83\u4f1a\u628aLua\u811a\u672c\u4f5c\u4e3a\u4e00\u4e2a\u547d\u4ee4\u6267\u884c\uff0c\u4f1a\u963b\u585e\u671f\u95f4\u63a5\u6536\u5230\u5176\u4ed61\u7ebf\u7a0b\u547d\u4ee4\uff0c\u8fd9\u5c31\u4fdd\u8bc1\u4e86Lua\u811a\u672c\u7684\u539f\u5b50\u6027<\/p>\n\n\n\n
\u63d0\u793a\uff1aRedisTemplate\u8c03\u7528Lua\u811a\u672c\u7684APl\u5982\u4e0b\uff1a
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/eae78a2a399f4542bd10d0619da72bb8.png\")
<\/p>\n\n\n\n\u5728resource\u6587\u4ef6\u5939\u4e0b\u8bbe\u7f6eunlock.lua\u6587\u4ef6\uff0c<\/p>\n\n\n\n
--\u6bd4\u8f83\u7ebf\u7a0b\u6807\u5f0f\u4e0e\u9501\u4e2d\u7684\u6807\u8bc6\u662f\u5426\u4e00\u81f4\nif(redis.call('get',KEYS[1])==ARGV[1])then\n --\u91ca\u653e\u9501 del key\n return redis.call('del',KEYS[1])\nend\nreturn 0<\/code><\/pre>\n\n\n\nsimpleredislock\u5982\u4e0b<\/p>\n\n\n\n
package com.hmdp.utils;\n\nimport cn.hutool.core.lang.UUID;\nimport org.springframework.core.io.ClassPathResource;\nimport org.springframework.data.redis.core.StringRedisTemplate;\nimport org.springframework.data.redis.core.script.DefaultRedisScript;\nimport org.yaml.snakeyaml.events.Event;\n\nimport java.util.Collections;\nimport java.util.concurrent.TimeUnit;\n\npublic class SimpleRedisLock implements ILock {\n private String name;\/\/\u9501\u7684\u540d\u79f0,\u4f60\u53ef\u4ee5\u7ed9\u9501\u52a0\u4e00\u4e2a\u7edf\u4e00\u524d\u7f00\n private StringRedisTemplate stringRedisTemplate;\n\n public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {\n this.name = name;\n this.stringRedisTemplate = stringRedisTemplate;\n }\n\n private static final String KEY_PREFIX = \"lock:\";\n private static final String ID_PREFIX = UUID.randomUUID().toString(true) + \"-\";\n private static final DefaultRedisScript <Long> UNLOCK_SCRIPT;\n static {\n UNLOCK_SCRIPT = new DefaultRedisScript<>();\n UNLOCK_SCRIPT.setLocation(new ClassPathResource(\"unlock.lua\"));\n UNLOCK_SCRIPT.setResultType(Long.class);\n }\n\n @Override\n public boolean tryLock(long timeoutSec) {\n \/\/\u83b7\u53d6\u7ebf\u7a0b\u6807\u8bc6\n String threadId = ID_PREFIX + Thread.currentThread().getId();\n \/\/\u503c\u4e0d\u80fd\u968f\u4fbf\u8bbe\u7f6e\uff0c\u56e0\u4e3a\u4f1a\u6709\u7279\u6b8a\u60c5\u51b5\uff0c\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u5230\u5220\u9664\u9501\u4e4b\u524d\uff0ckey\u8fc7\u671f\u4e86\uff0c\n \/\/\u5176\u4ed6\u7ebf\u7a0b\u5c31\u8fdb\u6765\u6267\u884c\u64cd\u4f5c\uff0c\u8fd9\u6837\u5c31\u4f1a\u628a\u5176\u4ed6\u7ebf\u7a0b\u7684\u9501\u7ed9\u5220\u4e86\uff0c\u8fd9\u4e2a\u503c\u4f1a\u7528\u6765\u6bd4\u8f83\u662f\u5426\u662f\u8be5\u7ebf\u7a0b\u7684\u9501\u3002\u5177\u4f53\u53ef\u4ee5\u770b\u8c37\u7c92\u5546\u57cep158\n \/\/\u83b7\u53d6\u9501\n Boolean success = stringRedisTemplate.opsForValue().\n setIfAbsent(KEY_PREFIX + name, threadId, timeoutSec, TimeUnit.SECONDS);\n \/\/\u7531\u4e8e\u62c6\u7bb1\u4e0d\u80fd\u76f4\u63a5return\n return Boolean.TRUE.equals(success);\n }\n\n @Override\n public void unlock() {\n \/\/\n stringRedisTemplate.execute(\n UNLOCK_SCRIPT,\n Collections.singletonList(KEY_PREFIX+name),\n ID_PREFIX + Thread.currentThread().getId()\n );\n }\n \/*\n @Override\n public void unlock() {\n \/\/\u91ca\u653e\u9501\n \/\/\u8fd9\u91ccstatic\u4f1a\u4f7f\u540c\u4e00\u4e2ajvm\u7684\u6240\u6709\u7ebf\u7a0b\u7684uuid\u4e00\u6837\uff0c\u4f46\u662f\u7ebf\u7a0bid\u4e0d\u4e00\u6837\uff0c\u800c\u4e24\u4e2ajvm\u7684\u7ebf\u7a0bid\u6709\u53ef\u80fd\u76f8\u540c\uff0c\u4f46\u662fuuid\u4e0d\u4e00\u6837\n \/\/\u76f8\u540cjvm\u6709\u7ebf\u7a0b\u53f7id\u533a\u5206\uff0c\u4e0d\u540cjvm\u6709uuid\u533a\u5206\n \/\/\u83b7\u53d6\u7ebf\u7a0b\u6807\u793a\n String threadId=ID_PREFIX+Thread.currentThread().getId();\n \/\/\u83b7\u53d6\u9501\u4e2d\u7684\u6807\u793aI\n String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);\n \/\/\u5224\u65ad\u6807\u793a\u662f\u5426\u4e00\u81f4\n if(threadId.equals(id)) {\n stringRedisTemplate.delete(KEY_PREFIX + name);\n }\n }\n\n *\/\n\n}\n<\/code><\/pre>\n\n\n\n\n
\u57fa\u4e8eRedis\u7684\u5206\u5e03\u5f0f\u9501\u5b9e\u73b0\u601d\u8def\uff1a
\u5229\u7528setnxex\u83b7\u53d6\u9501\uff0c\u5e76\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u4fdd\u5b58\u7ebf\u7a0b\u6807\u793a
\u91ca\u653e\u9501\u65f6\u5148\u5224\u65ad\u7ebf\u7a0b\u6807\u793a\u662f\u5426\u4e0e\u81ea\u5df1\u4e00\u81f4\uff0c\u4e00\u81f4\u5219\u5220\u9664\u9501
\u7279\u6027\uff1a
\u5229\u7528setnx\u6ee1\u8db3\u4e92\u65a5\u6027
\u5229\u7528setex\u4fdd\u8bc1\u6545\u969c\u65f6\u9501\u4f9d\u7136\u80fd\u91ca\u653e\uff0c\u907f\u514d\u6b7b\u9501\uff0c\u63d0\u9ad8\u5b89\u5168\u6027
\u5229\u7528Redis\u96c6\u7fa4\u4fdd\u8bc1\u9ad8\u53ef\u7528\u548c\u9ad8\u5e76\u53d1\u7279\u6027 <\/p>\n<\/blockquote>\n\n\n\n\u53ea\u662f\u89e3\u51b3\u4e86\u8bef\u5220\u9501\uff0c\u4f46\u662f\u5e76\u6ca1\u6709\u5b8c\u5168\u89e3\u51b3\u4e00\u4eba\u591a\u5355\u7684\u53ef\u80fd\uff0c\u4f60\u628a\u4e24\u4e2a\u7684\u65ad\u70b9\u90fd\u6253\u5230\u67e5\u8be2\u7528\u6237\u662f\u5426\u4e0b\u5355\u7684\u90a3\u4e2acount\u7684\u90a3\u91cc\uff0c\u53ef\u80fd\u4e24\u4e2a\u7ebf\u7a0b\u5f97\u5230\u7684\u90fd\u662f0\uff0c\u8fd9\u6837\u8fd8\u662f\u4f1a\u4e00\u4eba\u591a\u5355\uff08\u4e1a\u52a1\u6ca1\u8d70\u5b8c\u9501\u5457\u91ca\u653e\u4e86\uff0c\u5c31\u51fa\u73b0\u4e00\u4eba\u591a\u5355\u7684\u95ee\u9898\u4e86\uff0c\u8fd9\u91cc\u5e76\u6ca1\u6709\u89e3\u51b3\u4e00\u4eba\u591a\u5355\u95ee\u9898\uff09<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/05dd6d3b8fe5475aa4e4d5e86ed3c1c4.png\")
<\/p>\n\n\n\nReentrantLock\u4e0d\u662f\u5206\u5e03\u5f0f\u9501\u5427 <\/p>\n\n\n\n
Redisson<\/h3>\n\n\n\n
Redisson\u662f\u4e00\u4e2a\u5728Redis\u7684\u57fa\u7840\u4e0a\u5b9e\u73b0\u7684Java\u9a7b\u5185\u5b58\u6570\u636e\u7f51\u683c\uff08In-MemoryDataGrid\uff09\u3002\u5b83\u4e0d\u4ec5\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u5206\u5e03\u5f0f\u7684Java\u5e38\u7528\u5bf9\u8c61\uff0c\u8fd8\u63d0\u4f9b\u4e86\u8bb8\u591a\u5206\u5e03\u5f0f\u670d\u52a1\uff0c\u5176\u4e2d\u5c31\u5305\u542b\u4e86\u5404\u79cd\u5206\u5e03\u5f0f\u9501\u7684\u5b9e\u73b0\u3002<\/p>\n\n\n\n
- \n
- 8.\u5206\u5e03\u5f0f\u9501\uff08Lock\uff09\u548c\u540c\u6b65\u5668\uff08Synchronizer)<\/li>\n\n\n\n
- 8.1.\u53ef\u91cd\u5165\u9501(Reentrant Lock)<\/li>\n\n\n\n
- 8.2.\u516c\u5e73\u9501(Fair Lock)<\/li>\n\n\n\n
- 8.3.\u8054\u9501(MultiLock)<\/li>\n\n\n\n
- 8.4.\u7ea2\u9501 (RedLock)<\/li>\n\n\n\n
- 8.5.\u8bfb\u5199\u9501(ReadWriteLock)<\/li>\n\n\n\n
- 8.6.\u4fe1\u53f7\u91cf\uff08Semaphore)<\/li>\n\n\n\n
- 8.7.\u53ef\u8fc7\u671f\u6027\u4fe1\u53f7\u91cf\uff08PermitExpirableSemaphore)<\/li>\n\n\n\n
- 8.8.\u95ed\u9501(CountDownLatch)<\/li>\n<\/ul>\n\n\n\n
\u5b98\u7f51\u5730\u5740\uff1ahttps:\/\/redisson.org
GitHub\u5730\u5740\uff1ahttps:\/\/github.com\/redisson\/redisson<\/p>\n\n\n\n\u5728pom.xml\u4e2d\u6dfb\u52a0\u4f9d\u8d56<\/p>\n\n\n\n
<dependency>\n <groupId>org.redisson<\/groupId>\n <artifactId>redisson<\/artifactId>\n <version>3.13.6<\/version>\n <\/dependency><\/code><\/pre>\n\n\n\n\u5728config\u4e2d\u65b0\u5efaRedissonConfig\uff0c\u6309\u7167\u81ea\u5df1\u7684redis\u914d\u7f6e\u8f93\u5165<\/p>\n\n\n\n
package com.hmdp.config;\n\nimport org.redisson.Redisson;\nimport org.redisson.api.RedissonClient;\nimport org.redisson.config.Config;\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\n\n@Configuration\npublic class RedissonConfig {\n @Bean\n public RedissonClient redisson() {\n \/\/\u914d\u7f6e\n Config config = new Config();\n config.useSingleServer().setAddress(\"redis:\/\/192.168.111.130:6379\").setPassword(\"123456\");\n \/\/\u521b\u5efaRedissonClient\u5bf9\u8c61\n return Redisson.create(config);\n }\n}\n<\/code><\/pre>\n\n\n\nvoucherOrderserviceimpl\u4e2d\u7684\u9501\u5bf9\u8c61\u4fee\u6539<\/p>\n\n\n\n
Long userId = UserHolder.getUser().getId();\n \/\/\u521b\u5efa\u9501\u5bf9\u8c61\n \/\/SimpleRedisLock lock=new SimpleRedisLock(\"ordere:\" +userId,stringRedisTemplate);\n RLock lock = redissonClient.getLock(\"lock:order:\"+userId);\n \/\/\u83b7\u53d6\u9501\n boolean isLock=lock.tryLock();\/\/\u5176\u5b9e\u662f3\u4e2a\u53c2\u6570\uff0c\u4e5f\u53ef\u4ee5\u9009\u62e9\u65e0\u53c2\n if(!isLock){\n return Result.fail(\"\u4e0d\u80fd\u91cd\u590d\u4e0b\u5355\");\n }<\/code><\/pre>\n\n\n\nRedissonTest.java<\/p>\n\n\n\n
package com.hmdp;\n\nimport lombok.extern.slf4j.Slf4j;\nimport org.junit.jupiter.api.BeforeEach;\nimport org.junit.jupiter.api.Test;\nimport org.redisson.api.RLock;\nimport org.redisson.api.RedissonClient;\nimport org.springframework.boot.test.context.SpringBootTest;\n\nimport javax.annotation.Resource;\nimport java.util.concurrent.TimeUnit;\n\n@Slf4j\n@SpringBootTest\nclass RedissonTest {\n\n @Resource\n private RedissonClient redissonClient;\n\n private RLock lock;\n\n @BeforeEach\n void setUp() {\n lock = redissonClient.getLock(\"order\");\n }\n\n @Test\n void method1() throws InterruptedException {\n \/\/ \u5c1d\u8bd5\u83b7\u53d6\u9501\n boolean isLock = lock.tryLock(1L, TimeUnit.SECONDS);\n if (!isLock) {\n log.error(\"\u83b7\u53d6\u9501\u5931\u8d25 .... 1\");\n return;\n }\n try {\n log.info(\"\u83b7\u53d6\u9501\u6210\u529f .... 1\");\n method2();\n log.info(\"\u5f00\u59cb\u6267\u884c\u4e1a\u52a1 ... 1\");\n } finally {\n log.warn(\"\u51c6\u5907\u91ca\u653e\u9501 .... 1\");\n lock.unlock();\n }\n }\n void method2() {\n \/\/ \u5c1d\u8bd5\u83b7\u53d6\u9501\n boolean isLock = lock.tryLock();\n if (!isLock) {\n log.error(\"\u83b7\u53d6\u9501\u5931\u8d25 .... 2\");\n return;\n }\n try {\n log.info(\"\u83b7\u53d6\u9501\u6210\u529f .... 2\");\n log.info(\"\u5f00\u59cb\u6267\u884c\u4e1a\u52a1 ... 2\");\n } finally {\n log.warn(\"\u51c6\u5907\u91ca\u653e\u9501 .... 2\");\n lock.unlock();\n }\n }\n}\n<\/code><\/pre>\n\n\n\nRedisson\u53ef\u91cd\u5165\u9501\u539f\u7406<\/h3>\n\n\n\n
\u81ea\u5b9a\u4e49\u7684\u5206\u5e03\u5f0f\u9501\u6709\u4e00\u4e2a\u7f3a\u9677\uff0c\u5c31\u662f\u65e0\u6cd5\u5b9e\u73b0\u53ef\u91cd\u5165\uff0c\u800cRedis\u5b83\u5c31\u53ef\u4ee5\u505a\u5230\u3002\u90a3\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f\u8fd9\u8282\u8bfe\u6211\u4eec\u5c31\u4e00\u8d77\u6765\u7814\u7a76\u4e00\u4e0b\u3002\u54b1\u4eec\u81ea\u5b9a\u4e49\u7684\u5206\u5e03\u5f0f\u9501\u91c7\u7528\u7684\u662f`SETNX`\u548c`EXPIRE`\u547d\u4ee4\uff0c\u4e5f\u5c31\u662f\u7b80\u5355\u7684key-value\uff0c\u6574\u4e2a\u9501\u7684\u6d41\u7a0b\u662f\u8fd9\u6837\u5b50\u7684\uff1a<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/213d62e82fbb448ead493a7ca49763fa.png\")
<\/p>\n\n\n\n\u5728\u4e00\u5f00\u59cb\u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u5176\u5b9e\u5c31\u662f\u6267\u884c\u8fd9\u4e2a`SET`\u547d\u4ee4\uff0c\u5f53\u7136\u8981\u52a0\u4e0a`NX`\u548c`EX`\u53c2\u6570\u3002\u90a3`NX`\u7684\u76ee\u7684\u5c31\u662f\u4e3a\u4e86\u5b9e\u73b0\u4e00\u4e2a\u4e92\u65a5\uff0c\u6ee1\u8db3\u5206\u5e03\u5f0f\u9501\u7684\u57fa\u672c\u8981\u6c42\u3002\u540c\u65f6\u5462\uff0c\u5728\u83b7\u53d6\u9501\u7684\u65f6\u5019\uff0c\u6211\u4eec\u8981\u5b58\u5165\u8fd9\u4e2a\u7ebf\u7a0b\u7684\u6807\u8bc6\uff0c\u5176\u76ee\u7684\u5c31\u662f\u5c06\u6765\u5728\u91ca\u653e\u9501\u7684\u65f6\u5019\u505a\u5224\u65ad\uff0c\u907f\u514d\u8bef\u5220\uff0c\u53ea\u6709\u9501\u662f\u81ea\u5df1\u7684\u624d\u53bb\u505a\u8fd9\u4e2a\u5220\u9664\u3002<\/p>\n\n\n\n
\u90a3\u4e48\u8fd9\u6837\u7684\u4e00\u4e2a\u6d41\u7a0b\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u91cd\u5165\u5462\uff1f\u6211\u4eec\u4e00\u8d77\u6765\u770b\u4e00\u4e0b\u8fd9\u6837\u4e00\u4e2ademo\u3002<\/p>\n\n\n\n
\/\/ \u521b\u5efa\u9501\u5bf9\u8c61\nRLock lock = redissonClient.getLock(\"lock\");\n\n@Test\nvoid method1() {\n boolean isLock = lock.tryLock();\n if(!isLock){\n log.error(\"\u83b7\u53d6\u9501\u5931\u8d25\uff0c1\");\n return;\n }\n try {\n log.info(\"\u83b7\u53d6\u9501\u6210\u529f\uff0c1\");\n method2();\n } finally {\n log.info(\"\u91ca\u653e\u9501\uff0c1\");\n lock.unlock();\n }\n}\n\nvoid method2(){\n boolean isLock = lock.tryLock();\n if(!isLock){\n log.error(\"\u83b7\u53d6\u9501\u5931\u8d25\uff0c2\");\n return;\n }\n try {\n log.info(\"\u83b7\u53d6\u9501\u6210\u529f\uff0c2\");\n } finally {\n log.info(\"\u91ca\u653e\u9501\uff0c2\");\n lock.unlock();\n }\n}<\/code><\/pre>\n\n\n\n\u9996\u5148\u5728\u8fd9\u91cc\u6211\u4eec\u4f1a\u53bb\u521b\u5efa\u4e00\u4e2a\u9501\u7684\u5bf9\u8c61\uff0c\u63a5\u4e0b\u6765\u5462\u6709\u4e00\u4e2a\u6d4b\u8bd5\u65b9\u6cd5`method1`\uff0c\u5728`method1`\u91cc\u4f1a\u9996\u5148\u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u83b7\u53d6\u9501\u4e86\u4ee5\u540e\uff0c\u5982\u679c\u5931\u8d25\uff0c\u4ed6\u5c31\u4f1a\u62a5\u9519\uff0c\u800c\u5982\u679c\u6210\u529f\uff0c\u90a3\u4e48\u4ed6\u5c31\u4f1a\u53bb\u8c03\u7528\u4e00\u4e2a\u65b9\u6cd5`method2`\uff0c\u800c\u5728`method2`\u91cc\u53c8\u4e00\u6b21\u5c1d\u8bd5\u83b7\u53d6\u9501\u3002\u90a3\u4e48`method1`\u548c`method2`\u554a\uff0c\u4ed6\u4eec\u4e24\u4e2a\u662f\u5728\u4e00\u4e2a\u7ebf\u7a0b\u91cc\u7684\uff0c\u90a3\u4e00\u4e2a\u7ebf\u7a0b\u8fde\u7eed\u4e24\u6b21\u53bb\u83b7\u53d6\u9501\uff0c\u8fd9\u5176\u5b9e\u5c31\u662f\u9501\u7684\u91cd\u5165\u4e86\u3002<\/p>\n\n\n\n
\u90a3\u6211\u4eec\u6765\u770b\u4e00\u4e0b\uff0c\u5982\u679c\u6309\u7167\u6211\u4eec\u8fd9\u4e2a\u6d41\u7a0b\uff0c\u5b83\u80fd\u4e0d\u80fd\u5b9e\u73b0\u91cd\u5165\u3002\u9996\u5148`method1`\u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u90a3\u6309\u7167\u6211\u4eec\u8fd9\u91cc\u5c31\u4f1a\u53bb`SET`\u8fd9\u4e2a\u9501\u540d\u79f0\u4ee5\u53ca\u9501\u6807\u8bc6\u8fdb\u53bb\uff0c\u90a3\u5728\u8fd9\u5c31\u662f`lock`\u4ee5\u53ca\u6bd4\u5982\u8bf4\u8fd9\u4e2a\u7ebf\u7a0b\u540d\u53eb`t1`\uff0c\u6211\u4eec\u628a\u5b83\u5b58\u8fdb\u53bb\u4e86\u3002\u63a5\u4e0b\u6765\u5462\u5f80\u4e0b\u6267\u884c\u8c03\u7528\u8fd9\u4e2a`method2`\uff0c\u90a3\u4e48`method2`\u53c8\u4e00\u6b21\u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u90a3\u4e48\u53c8\u8981\u6267\u884c\u8fd9\u4e2a`SET lock t1`\u7684\u547d\u4ee4\uff0c\u90a3\u56e0\u4e3a\u8fd9\u91cc\u52a0\u4e86`NX`\u7684\u4e00\u4e2a\u53c2\u6570\uff0c\u4e5f\u5c31\u662f\u8bf4\u53ea\u6709\u7b2c\u4e00\u4e2a\u80fd\u6210\u529f\uff0c\u90a3\u8fd9\u91cc\u5df2\u7ecf\u6709\u503c\u4e86\uff0c\u6240\u4ee5\u8bf4`method2`\u5728\u6267\u884c\u7684\u65f6\u5019\u4e00\u5b9a\u662f\u5931\u8d25\u3002\u6240\u4ee5\u8bf4\u6211\u4eec\u5c31\u6ca1\u6709\u529e\u6cd5\u5b9e\u73b0\u91cd\u5165\u4e86\u3002<\/p>\n\n\n\n
\u90a3\u600e\u4e48\u6837\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u5462\uff1f\u5176\u5b9e\u554a\uff0c\u8981\u60f3\u5b9e\u73b0\u53ef\u91cd\u5165\u9501\uff0c\u6211\u4eec\u53ef\u4ee5\u53c2\u8003JDK\u91cc\u9762\u63d0\u4f9b\u7684`ReentrantLock`\uff0c\u5b83\u7684\u539f\u7406\u554a\u3002\u90a3\u5982\u679c\u5927\u5bb6\u4e0d\u77e5\u9053\u6211\u4eecJDK\u7684`ReentrantLock`\u5b83\u7684\u539f\u7406\u7684\u8bdd\uff0c\u5efa\u8bae\u5927\u5bb6\u4e5f\u53bbB\u7ad9\u4e0a\u641c\u7d22\uff0c\u6211\u4eec\u9ed1\u9a6c\u7a0b\u5e8f\u5458\u7684\u4e00\u4e2a\u8bfe\u7a0b\u554a\uff0c\u53eb\u505aJava\u5e76\u53d1\u7f16\u7a0b\uff08JUC\uff09\u3002\u4f60\u5728\u8fd9\u641cJava\u5e76\u53d1\u7f16\u7a0b\u6392\u7b2c\u4e00\u7684\uff0c\u8fd9\u4e2aup\u4e3b\u662f\u9ed1\u9a6c\u7a0b\u5e8f\u5458\u7684\uff0c\u90a3\u5c31\u662f\u6211\u4eec\u51fa\u54c1\u7684\u4e00\u4e2a\u8bfe\u7a0b\u4e86\u3002\u5728\u8fd9\u4e2a\u5e76\u53d1\u8bfe\u7a0b\u91cc\u8fb9\uff0c\u5176\u5b9e\u5c31\u6709\u8bb2\u5230`ReentrantLock`\u5b83\u7684\u539f\u7406\u3002<\/p>\n\n\n\n
final boolean nonfairTryAcquire(int acquires) {\n final Thread current = Thread.currentThread();\n int c = getState();\n if (c == 0) {\n if (compareAndSetState(0, acquires)) {\n setExclusiveOwnerThread(current);\n return true;\n }\n }\n \/\/ \u5982\u679c\u5df2\u7ecf\u83b7\u5f97\u4e86\u9501\uff0c\u7ebf\u7a0b\u8fd8\u662f\u5f53\u524d\u7ebf\u7a0b\uff0c\u8868\u793a\u53d1\u751f\u4e86\u9501\u91cd\u5165\n else if (current == getExclusiveOwnerThread()) {\n int nextc = c + acquires;\n if (nextc < 0) \/\/ overflow\n throw new Error(\"Maximum lock count exceeded\");\n setState(nextc);\n return true;\n }\n return false;\n}\n\n\/\/ sync \u7ee7\u627f\u8fc7\u6765\u7684\u65b9\u6cd5\uff0c\u65b9\u4fbf\u9605\u8bfb\uff0c\u653e\u5728\u6b64\u5904\nprotected final boolean tryRelease(int releases) {\n int c = getState() - releases;\n if ((Thread.currentThread() != getExclusiveOwnerThread()))\n throw new IllegalMonitorStateException();\n boolean free = false;\n \/\/ \u53ea\u6709\u9501\u91cd\u5165\uff0c\u53ea\u6709 state \u51cf\u4e3a 0\uff0c\u624d\u91ca\u653e\u6210\u529f\n if (c == 0) {\n\/**************************************************************\/\n free = true;\n setExclusiveOwnerThread(null);\n }\n setState(c);\n return free;\n}<\/code><\/pre>\n\n\n\n\u90a3\u4ed6\u4e3a\u4ec0\u4e48\u80fd\u5b9e\u73b0\u53ef\u91cd\u5165\u5462\uff1f\u54ce\uff0c\u5728\u8fd9\u7b80\u5355\u7ed9\u5927\u5bb6\u8bf4\u4e00\u4e0b\u554a\uff0c\u5176\u5b9e\u6240\u8c13\u7684\u53ef\u91cd\u5165\u65e0\u975e\u5c31\u662f\u5728\u83b7\u53d6\u9501\u7684\u65f6\u5019\uff0c\u5f53\u6211\u5224\u65ad\u8fd9\u4e2a\u9501\u5df2\u7ecf\u6709\u4eba\u7684\u60c5\u51b5\u4e0b\uff0c\u90a3\u6211\u4f1a\u770b\u4e00\u4e0b\u662f\u4e0d\u662f\u6211\u81ea\u5df1\uff0c\u4e5f\u5c31\u662f\u8bf4\u662f\u4e0d\u662f\u540c\u4e00\u4e2a\u7ebf\u7a0b\u3002\u5982\u679c\u662f\u540c\u4e00\u4e2a\u7ebf\u7a0b\u7684\u8bdd\uff0c\u6211\u4e5f\u4f1a\u8ba9\u4ed6\u83b7\u53d6\u9501\uff0c\u4f46\u662f\u8981\u591a\u505a\u4e00\u4ef6\u4e8b\uff0c\u5c31\u662f\u6709\u4e00\u4e2a\u8ba1\u6570\u5668\uff0c\u53bb\u8bb0\u5f55\u4f60\u91cd\u5165\u7684\u6b21\u6570\uff0c\u5c31\u662f\u8bf4\u4f60\u603b\u5171\u83b7\u53d6\u4e86\u51e0\u6b21\u3002\u90a3\u4e48\u4f60\u5728`tryAcquire`\uff0c\u5c31\u662f\u83b7\u53d6\u9501\u7684\u65f6\u5019\uff0c\u6211\u4eec\u8fd9\u4e2a\u6b21\u6570\u4f1a\u53bb\u7d2f\u52a0\uff0c\u4e0d\u65ad\u52a0\u4e00\uff0c\u4e0d\u65ad\u52a0\u4e00\u3002\u800c\u5c06\u6765\u4f60\u518d\u53bb`release`\uff0c\u91ca\u653e\u9501\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u6b21\u6570\u4f1a\u51cf\u4e00\u3002\u54ce\uff0c\u8fd9\u5c31\u662f\u53ef\u91cd\u5165\u7684\u4e00\u4e2a\u57fa\u672c\u7684\u4e00\u4e2a\u539f\u7406\u554a\u3002<\/p>\n\n\n\n
\u56e0\u6b64\u518d\u53bb\u5b9e\u73b0\u65f6\uff0c\u4e5f\u53ef\u4ee5\u53c2\u8003\u5b83\u3002\u90a3\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u5176\u5b9e\u4e0d\u4ec5\u4ec5\u8981\u5728\u9501\u91cc\u8fb9\u8981\u53bb\u8bb0\u5f55\u83b7\u53d6\u9501\u7684\u7ebf\u7a0b\uff0c\u8fd8\u8981\u53bb\u8bb0\u5f55\u8fd9\u4e2a\u7ebf\u7a0b\u5b83\u7684\u91cd\u590d\u7684\u6b21\u6570\uff0c\u603b\u5171\u62ff\u4e86\u51e0\u6b21\u3002\u6bcf\u62ff\u4e00\u6b21\u6b21\u6570\u5c31\u52a0\u4e00\uff0c\u8ba9\u540c\u5b66\u4eec\u601d\u8003\u4e00\u4e0b\uff0c\u73b0\u5728\u5462\u6211\u4eec\u65e2\u8981\u8bb0\u5f55\u7ebf\u7a0b\u6807\u8bc6\uff0c\u53c8\u8981\u8bb0\u5f55\u91cd\u590d\u7684\u6b21\u6570\uff0c\u90a3\u8fd9\u6837\u4e00\u6765\uff0c\u6211\u4eec\u7684\u8fd9\u4e2a`String`\u7c7b\u578b\u7684\u7ed3\u6784\u663e\u7136\u5c31\u4e0d\u884c\u4e86\u5427\u3002\u4ec0\u4e48\u6837\u7684\u6570\u636e\u7ed3\u6784\u53ef\u4ee5\u6ee1\u8db3\uff0c\u5728\u4e00\u4e2akey\u91cc\u5b58\u50a8\u4e24\u4e2a\u4e1c\u897f\uff1f\u5176\u5b9e\u53ef\u4ee5\u4f7f\u7528\u5b83\u91cc\u9762\u7684\u54c8\u5e0c\u7ed3\u6784\uff0c\u56e0\u4e3a\u54c8\u5e0c\u7ed3\u6784\uff0c\u5b83\u7684value\u91cc\u9762\u662f\u4e0d\u662f\u53ef\u4ee5\u53c8\u5206\u6210\u4e24\u4e2a\uff0c\u4e00\u4e2afield\u7684\u4e00\u4e2avalue\u3002\u90a3\u8fd9\u4e2a\u65f6\u5019\u5462\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5728key\u7684\u4f4d\u7f6e\u8bb0\u5f55\u9501\u7684\u540d\u79f0\uff0c\u7136\u540e\u5728field\u7684\u4f4d\u7f6e\u53bb\u8bb0\u5f55\u7ebf\u7a0b\u6807\u8bc6\uff0c\u5728value\u4f4d\u7f6e\u8bb0\u5f55\u8fd9\u4e2a\u9501\u7684\u91cd\u590d\u6b21\u6570<\/strong><\/p>\n\n\n\n
KEY<\/td> VALUE<\/td><\/tr> field<\/td> value<\/td><\/tr> lock<\/td> thread1<\/td> 1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \u6bd4\u65b9\u8bf4\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u521b\u5efa\u9501\u5bf9\u8c61\uff0c\u7136\u540e\u53bb`tryLock`\uff0c\u90a3\u4e48\u7b2c\u4e00\u6b21\u6765\u7684\u65f6\u5019\uff0c\u5728\u8fd9\u91cc\u6211\u4eec\u4f1a\u8bb0\u5f55\u8fd9\u4e2a\u7ebf\u7a0b\u6807\u8bc6\uff0c\u5e76\u4e14\u628a\u8fd9\u4e2a\u6b21\u6570\u91cd\u7f6e\u4e3a1\uff0c\u56e0\u4e3a\u4ed6\u662f\u7b2c\u4e00\u4e2a\u6765\u7684\u561b\u3002\u597d\uff0c\u7136\u540e\u5f80\u4e0b\u8d70\uff0c\u6211\u4eec\u8ba4\u4e3a\u5b83\u4f1a\u9501\u6210\u529f\u4e86\u5417\uff1f\u90a3\u63a5\u4e0b\u6765\u8c03\u7528`method2`\uff0c\u800c\u5728`method2`\u7684\u53c8\u4e00\u6b21\u5c1d\u8bd5\u8fc7\u53bb\u9501\uff0c\u90a3\u4e48\u4ed6\u9996\u5148\u8981\u505a\u7684\u80af\u5b9a\u662f\u770b\u4e00\u770b\u8fd9\u4e2a\u9501\u662f\u4e0d\u662f\u6709\u4eba\u4e86\u3002\u90a3\u8fd9\u4e2a\u9501\u5df2\u7ecf\u6709\u4eba\u4e86\uff0c\u8fd9\u4e2a\u65f6\u5019\u4e0d\u4ee3\u8868\u5931\u8d25\uff0c\u8fd8\u8981\u518d\u5224\u65ad\u4e00\u4e0b\u83b7\u53d6\u9501\u8fd9\u4e2a\u7ebf\u7a0b\u662f\u4e0d\u662f\u6211\u81ea\u5df1\u5440\u3002\u54ce\uff0c\u90a3\u56e0\u4e3a`method1`\u662f\u8c03`method2`\uff0c\u6240\u4ee5\u4ed6\u4fe9\u662f\u5728\u4e00\u4e2a\u7ebf\u7a0b\u91cc\u7684\uff0c\u6240\u4ee5\u8fd9\u4e2a\u6807\u8bc6\u80af\u5b9a\u662f\u4e00\u6837\u7684\u5440\u3002\u90a3\u6807\u8bc6\u4e00\u6837\u600e\u4e48\u529e\uff0cok\uff0c\u53ea\u9700\u8981\u628a\u91cd\u590d\u7684\u6b21\u6570\u600e\u4e48\u6837\uff0c\u54ce\uff0c\u52a0\u4e00\u5c31\u53ef\u4ee5\u4e86\uff0c\u4ee3\u8868\u5462\u6211\u662f\u7b2c\u4e8c\u6b21\u83b7\u53d6\u9501\u4e86\u3002\u4ee5\u6b64\u7c7b\u63a8\u554a\uff0c\u5982\u679c\u8bf4\u518d\u6709\u91cd\u590d\uff0c\u90a3\u5c31\u7ee7\u7eed\u7d2f\u52a0\u4e09\u3001\u56db\uff0c\u8fd9\u6837\u5b50\u597d\u4e86\u3002\u8fd9\u4e2a\u65f6\u5019`method2`\u62ff\u5230\u9501\u4e86\uff0c\u5df2\u7ecf\u91cd\u5165\u4e86\uff0c\u662f\u4e0d\u662f\u53ef\u4ee5\u6267\u884c\u81ea\u5df1\u7684\u4e1a\u52a1\u4e86\u5440\uff1f\u597d\uff0c\u6267\u884c\u5b8c\u4e86\u81ea\u5df1\u7684\u4e1a\u52a1\u6700\u7ec8\u8981\u5e72\u4ec0\u4e48\uff0c\u8981\u91ca\u653e\u9501\u3002\u90a3\u4e48\u91ca\u653e\u9501\u80fd\u4e0d\u80fd\u50cf\u4ee5\u524d\u4e00\u6837\u554a\uff0c\u9996\u5148\u5224\u65ad\u4e00\u4e0b\u6807\u8bc6\u662f\u4e0d\u662f\u81ea\u5df1\u54e6\uff0c\u4e00\u5224\u65ad\u662f\u7684\uff0c\u5c31\u662f\u6211\uff0c\u7136\u540e\u63a5\u4e0b\u6765\u76f4\u63a5\u5220\u9664\uff0c\u80fd\u4e0d\u80fd\u8fd9\u4e48\u505a\uff1f\u54ce\uff0c\u7b54\u6848\u662f\u4e0d\u80fd\u554a\u3002\u540c\u5b66\u4eec\u601d\u8003\u4e00\u4e0b\uff0c\u5982\u679c\u6211\u5728\u8fd9\u554a\uff0c\u5728`method2`\u91cc\u76f4\u63a5\u628a\u8fd9\u4e2a\u9501\u5220\u4e86\uff0c\u4f60\u8981\u77e5\u9053\uff0c`method2`\u7ed3\u675f\u5e76\u4e0d\u4ee3\u8868\u6574\u4e2a\u4e1a\u52a1\u7ed3\u675f\u5427\uff0c\u56e0\u4e3a`method2`\u51fa\u6765\u4ee5\u540e\uff0c\u8fd8\u8981\u53bb\u6267\u884c`method1`\u7684\u5269\u4f59\u4e1a\u52a1\u3002\u867d\u7136\u6211\u4eec\u8fd9\u6ca1\u5199\uff0c\u4f46\u662f\u5f88\u6709\u53ef\u80fd\u5728\u771f\u5b9e\u573a\u666f\u4e0b\u662f\u6709\u5176\u4ed6\u4e1a\u52a1\u7684\u3002\u90a3\u4e5f\u5c31\u662f\u8bf4\u5728`method1`\u4e1a\u52a1\u5c1a\u672a\u6267\u884c\u5b8c\u7684\u65f6\u5019\uff0c`method2`\u76f4\u63a5\u5c31\u628a\u9501\u7ed9\u5220\u4e86\uff0c\u90a3\u4e48\u6b64\u65f6\u662f\u4e0d\u662f\u5c31\u6709\u5176\u4ed6\u7ebf\u7a0b\u53ef\u4ee5\u8fdb\u6765\u4e86\uff0c\u662f\u4e0d\u662f\u5c31\u6709\u53ef\u80fd\u53d1\u751f\u4e00\u4e9b\u5e76\u53d1\u7684\u5b89\u5168\u95ee\u9898\u4e86\uff1f<\/p>\n\n\n\n
\u6240\u4ee5\u8bf4\u554a\uff0c\u5bf9\u4e8e\u8fd9\u79cd\u53ef\u91cd\u5165\u9501\u6765\u8bb2\uff0c\u5728\u5185\u90e8\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\u91cc\u8fb9\uff0c\u91ca\u653e\u9501\u7684\u65f6\u5019\u662f\u4e0d\u80fd\u76f4\u63a5\u5220\u9664\u9501\u7684\u3002\u90a3\u4e48\u4ed6\u91c7\u53d6\u7684\u63aa\u65bd\u662f\u4ec0\u4e48\uff0c\u662f\u628a\u91cd\u5165\u6b21\u6570\u51cf\u4e00\u3002\u4e5f\u5c31\u662f\u8bf4\u6bcf\u91ca\u653e\u4e00\u6b21\u6211\u5c31\u51cf\u4e00\u5c31\u884c\u4e86\u3002\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u6211\u4eec\u4ec0\u4e48\u65f6\u5019\u624d\u80fd\u91ca\u653e\u9501\uff0c\u771f\u7684\u628a\u8fd9\u4e2a\u9501\u7ed9\u4ed6\u5220\u9664\u5462\uff1f\u54ce\uff0c\u90a3\u80af\u5b9a\u662f\u5f53\u6211\u4eec\u6240\u6709\u7684\u4e1a\u52a1\u90fd\u6267\u884c\u5b8c\uff0c\u8d70\u5230\u6700\u5916\u5c42\u7684\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u5b83\u5728\u7ed3\u675f\u91ca\u653e\u65f6\u624d\u80fd\u5220\u9664\u3002\u4f46\u95ee\u9898\u6765\u4e86\uff0c\u6211\u4eec\u600e\u4e48\u77e5\u9053\u8fd9\u4e2a\u4e1a\u52a1\u91ca\u653e\u7684\u65f6\u5019\uff0c\u662f\u4e0d\u662f\u5df2\u7ecf\u5230\u6700\u5916\u5c42\u4e86\u5462\uff1f\u8ba9\u5927\u5bb6\u601d\u8003\u4e00\u4e0b\u554a\uff0c\u6211\u4eec\u6bcf\u6b21\u83b7\u53d6\u9501\u8fd9\u4e2a\u91cd\u590d\u6b21\u6570\u5c31\u4f1a\u52a0\u4e00\uff0c\u800c\u6bcf\u6b21\u91ca\u653e\u9501\u8fd9\u4e2a\u503c\u4f1a\u51cf\u4e00\u3002\u4f46\u662f\u5728\u65b9\u6cd5\u5f53\u4e2d\uff0c\u83b7\u53d6\u9501\u548c\u91ca\u653e\u9501\u90fd\u662f\u6210\u5bf9\u51fa\u73b0\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u4f60\u52a0\u4e86\u591a\u5c11\u6b21\uff0c\u5c06\u6765\u91ca\u653e\u9501\u7684\u65f6\u5019\u5c31\u4e00\u5b9a\u4f1a\u51cf\u591a\u5c11\u6b21\u3002\u90a3\u540c\u5b66\u4eec\u5f53\u65b9\u6cd5\u8d70\u5230\u6700\u5916\u5c42\u65f6\uff0c\u8fd9\u4e2a\u91cd\u590d\u6b21\u6570\u7684\u503c\u4e00\u5b9a\u4f1a\u88ab\u51cf\u6210\u96f6\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u6bd4\u65b9\u8bf4\u73b0\u5728\u6211`method2`\uff0c\u4ed6\u5728\u91ca\u653e\u9501\u65f6\uff0c\u8fd9\u4e2a\u503c\u5df2\u7ecf\u51cf\u5230\u4e86\u4e00\u597d\uff0c\u4ed6\u4e1a\u52a1\u7ed3\u675f\u4e86\uff0c\u8d70\u5230\u4e86`method1`\uff0c`method1`\u5c31\u662f\u6700\u5916\u5c42\u3002\u90a3\u6b64\u65f6\u53c8\u4e00\u6b21\u91ca\u653e\u9501\uff0c\u90a3\u4e48\u53c8\u51cf\u4e00\u6b21\uff0c\u5b83\u7684\u503c\u5c31\u53d8\u6210\u4e86\u96f6\u3002\u6240\u4ee5\u8bf4\u5462\uff0c\u6211\u4eec\u6bcf\u4e00\u6b21\u5728\u91ca\u653e\u9501\u7684\u65f6\u5019\uff0c\u9664\u4e86\u8981\u53bb\u628a\u91cd\u590d\u6b21\u6570\u51cf\u4e00\u4ee5\u5916\uff0c\u8fd8\u5e94\u8be5\u5224\u65ad\u4e00\u4e0b\u8fd9\u4e2a\u503c\u662f\u4e0d\u662f\u5df2\u7ecf\u4e3a\u96f6\u4e86\u3002\u5982\u679c\u5df2\u7ecf\u662f\u96f6\u4e86\uff0c\u90a3\u5c31\u8bc1\u660e\u6211\u5df2\u7ecf\u5230\u4e86\u6700\u5916\u5c42\u7684\u8fd9\u4e2a\u65b9\u6cd5\u4e86\uff0c\u4e5f\u5c31\u662f\u8bf4\u6ca1\u6709\u5176\u4ed6\u4e1a\u52a1\u9700\u8981\u6267\u884c\u4e86\uff0c\u6b64\u65f6\u4f60\u5c31\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u5730\u628a\u8fd9\u4e2a\u9501\u5220\u9664\u4e86\u3002\u5982\u679c\u8bf4\u4e0d\u662f\u96f6\uff0c\u8bc1\u660e\u554a\u8fd8\u6709\u522b\u7684\u4e1a\u52a1\uff0c\u90a3\u4e48\u4f60\u5c31\u4e0d\u8981\u7ba1\u4e86\uff0c\u4ea4\u7ed9\u5176\u4ed6\u4e1a\u52a1\u53bb\u5904\u7406\u5c31\u884c\u4e86\u3002\u8fd9\u5c31\u662f\u6211\u4eec\u53ef\u91cd\u5165\u9501\u7684\u6700\u7ec8\u539f\u7406\u4e86\uff0c\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u5229\u7528\u54c8\u5e0c\u7ed3\u6784\u4ee3\u66ff\u4e86\u5b57\u7b26\u4e32\u7ed3\u6784\uff0c\u4e0d\u4ec5\u4ec5\u5b58\u50a8\u7ebf\u7a0b\u6807\u8bc6\uff0c\u8fd8\u6709\u5b58\u50a8\u53ef\u91cd\u5165\u7684\u6b21\u6570\u3002\u90a3\u56e0\u6b64\u5462\uff0c\u83b7\u53d6\u9501\u548c\u91ca\u653e\u9501\u7684\u64cd\u4f5c\u554a\uff0c\u8ddf\u4ee5\u524d\u5c31\u4f1a\u6709\u5f88\u5927\u7684\u5dee\u522b\u4e86\u3002<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/6744b0cd36d340ba96a782528ef33189.png\")
<\/p>\n\n\n\n\u90a3\u4ee5\u524d\u6211\u4eec\u91c7\u7528\u7684\u662f`String`\u7c7b\u578b\u7684\u7ed3\u6784\uff0c\u91c7\u7528\u7684\u547d\u4ee4\u5462\u662f`SET NX EX`\uff0c\u5176\u4e2d`SET NX`\u554a\u662f\u6765\u5224\u65ad\u9501\u662f\u5426\u5b58\u5728\u5b9e\u73b0\u4e92\u65a5\uff0c\u800c`EX`\u662f\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u3002\u4f46\u662f\u73b0\u5728\u5462\u6211\u4eec\u7528\u7684\u662f\u54c8\u5e0c\u7ed3\u6784\uff0c\u54c8\u5e0c\u7ed3\u6784\u91cc\u53ef\u6ca1\u6709\u8fd9\u6837\u7684\u7ec4\u5408\u547d\u4ee4\u554a\uff0c\u6ca1\u6709`NX`\u8fd9\u6837\u7684\u4e1c\u897f\u3002\u6240\u4ee5\u8bf4\u5440\uff0c\u6211\u4eec\u53ea\u80fd\u662f\u628a\u4e4b\u524d\u90a3\u4e2a\u903b\u8f91\u7ed9\u5b83\u62c6\u5f00\uff0c\u5148\u5224\u65ad\u9501\u662f\u5426\u5b58\u5728\u624b\u52a8\u5224\u65ad\u554a\uff0c\u6ca1\u6709`NX`\u600e\u4e48\u5224\u65ad\u5440\uff1f\u5176\u5b9e\u5c31\u662f\u7528\u4e00\u4e2a`EXISTS`\u5224\u65ad\u4e00\u4e0b\u8fd9\u4e2akey\u554a\uff0c\u662f\u4e0d\u662f\u5b58\u5728\u3002\u90a3\u7ed3\u679c\u6709\u4e24\u79cd\u554a\uff0c\u8981\u4e48\u4e0d\u5b58\u5728\uff0c\u90a3\u4e48\u5b58\u5728\u3002\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u90a3\u5c31\u597d\u529e\u4e86\u5440\uff0c\u8bc1\u660e\u6211\u662f\u7b2c\u4e00\u4e2a\u6765\u7684\u5440\uff0c\u5c31\u50cf\u8fd9\u4e2a`method1`\u5bf9\u5427\uff1f\u90a3\u600e\u4e48\u529e\u5440\uff0c\u80af\u5b9a\u662f\u6765\u53bb\u83b7\u53d6\u9501\u6807\u8bc6\u554a\uff0c\u6dfb\u52a0\u8fdb\u53bb\uff0c\u5e76\u4e14\u8fd9\u4e2a\u503c\u8981\u6539\u6210\u4e00\u5bf9\u4e0d\u5bf9\uff1f\u5509\uff0c\u8fd9\u662f\u7b2c\u4e00\u6b21\u83b7\u53d6\u554a\u3002\u597d\u4e86\uff0c\u90a3\u83b7\u53d6\u5b8c\u4e86\u4ee5\u540e\u6ca1\u7ed3\u675f\u554a\uff0c\u56e0\u4e3a\u5728\u4e4b\u524d\u9664\u4e86`NX`\uff0c\u8fd8\u6709`EX`\uff0c\u4e5f\u5c31\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u662f\u4e2a\u515c\u5e95\u65b9\u6848\u3002\u90a3\u5728\u8fd9\u513f\u5462\u6211\u4eec\u540c\u6837\u8981\u6536\u5165\u8fc7\u51e0\u65f6\u95f4\uff0c\u90a3\u53ea\u4e0d\u8fc7\u6539\u6210\u4e86\u624b\u52a8\u53bb\u8bbe\u7f6e\uff0c\u6539\u6210\u4e86`EXPIRE`\u7684\u547d\u4ee4\u597d\u3002\u90a3\u53ea\u6709\u8fd9\u4e24\u6b65\u90fd\u8d70\u5b8c\u4e86\uff0c\u624d\u7b49\u4e8e\u4ee5\u524d\u90a3\u4e2a`NX`\u548c`EX`\uff0c\u8fd9\u4e2a\u65f6\u5019\u83b7\u53d6\u9501\u624d\u7b97\u6210\u529f\uff0c\u4f60\u624d\u53ef\u4ee5\u53bb\u6267\u884c\u81ea\u5df1\u7684\u4e1a\u52a1\u554a\u3002<\/p>\n\n\n\n
\u90a3\u5982\u679c\u8bf4\u6211\u4eec\u5224\u65ad\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u9501\u5b83\u5df2\u7ecf\u5b58\u5728\u4e86\u5462\uff0c\u5c31\u76f8\u5f53\u4e8e\u662f\u73b0\u5728\u6389\u4e86`method2`\uff0c\u4ed6\u53c8\u6765\u83b7\u53d6\u4e86\u3002\u90a3\u5982\u679c\u5df2\u7ecf\u5b58\u5728\uff0c\u662f\u4e0d\u662f\u6211\u5c31\u76f4\u63a5\u5931\u8d25\u4e86\u5462\uff1f\u5982\u679c\u662f\u4ee5\u524d\u662f\u8fd9\u6837\u5b50\u554a\uff0c\u4f46\u8fd9\u4e0d\u662f\u56e0\u4e3a\u6211\u4eec\u662f\u5141\u8bb8\u91cd\u5165\uff0c\u6240\u4ee5\u8bf4\u5462\u6211\u4eec\u5728\u8fd9\u5224\u65ad\u9501\u5df2\u7ecf\u5b58\u5728\u7684\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u8fd8\u8981\u770b\u4e00\u4e0b\u8fd9\u4e2a\u6807\u8bc6\u554a\uff0c\u662f\u4e0d\u662f\u81ea\u5df1\u662f\u4e0d\u662f\u540c\u4e00\u4e2a\u7ebf\u7a0b\u3002\u6240\u4ee5\u8bf4\u6709\u4e00\u4e2a\u5224\u65ad\u7ebf\u7a0b\u6807\u8bc6\u7684\u4e00\u4e2a\u4e1a\u52a1\u903b\u8f91\u554a\u3002\u5982\u679c\u8bf4\u5224\u65ad\u5b8c\u4e86\u4ee5\u540e\u53d1\u73b0\u4e0d\u662f\u81ea\u5df1\uff0c\u90a3\u8bc1\u660e\u8fd9\u4e2a\u9501\u6839\u672c\u5c31\u4e0d\u662f\u81ea\u5df1\u62ff\u7684\uff0c\u90a3\u8fd9\u4e2a\u65f6\u5019\u5c31\u771f\u7684\u662f\u5931\u8d25\u4e86\u3002\u4f46\u662f\u5982\u679c\u6211\u4eec\u5224\u65ad\u5b8c\u4e86\uff0c\u53d1\u73b0\u8fd9\u4e2a\u6807\u8bc6\u5c31\u662f\u81ea\u5df1\u554a\uff0c\u540c\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u90a3\u8bc1\u660e\u662f\u91cd\u5165\u3002\u90a3\u91cd\u5165\u6211\u4eec\u4e4b\u524d\u8bf4\u4e86\uff0c\u53ea\u9700\u8981\u628a\u6b21\u6570\u600e\u4e48\u6837\uff0c\u54ce\uff0c\u52a0\u4e00\u662f\u4e0d\u662f\u5c31\u53ef\u4ee5\u4e86\u554a\uff1f\u90a3\u6b21\u6570\u52a0\u4e00\u4e86\u4ee5\u540e\u5c31\u53ef\u4ee5\u53bb\u6267\u884c`method2`\u4e86\u3002\u5f53\u7136\u4e86\uff0c\u5728\u6267\u884c`method2`\u7684\u65f6\u5019\uff0c\u6211\u4eec\u8fd8\u8981\u5148\u91cd\u7f6e\u4e00\u4e0b\u6709\u6548\u671f\uff0c\u56e0\u4e3a\u554a\u5728`method1`\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u80fd\u5df2\u7ecf\u6d88\u8017\u4e86\u4e00\u5b9a\u7684\u9501\u7684\u65f6\u95f4\u4e86\uff0c\u6240\u4ee5\u5728\u8fd9\u6700\u597d\u91cd\u7f6e\u4e00\u4e0b\uff0c\u8ba9`method2`\u6709\u5145\u8db3\u7684\u65f6\u95f4\u53bb\u6267\u884c\u81ea\u5df1\u7684\u4e1a\u52a1\u3002\u90a3\u5230\u8fd9\u513f\u554a\uff0c\u5176\u5b9e\u5c31\u5b8c\u6210\u4e86\u4e00\u6b21\u9501\u7684\u91cd\u5165\u4e86\u3002<\/p>\n\n\n\n
\u597d\uff0c\u90a3\u7b49`method2`\u6267\u884c\u5b8c\u81ea\u5df1\u7684\u4e1a\u52a1\uff0c\u662f\u4e0d\u662f\u5c31\u53ef\u4ee5\u53bb\u91ca\u653e\u9501\u4e86\u5440\uff1f\u90a3\u91ca\u653e\u9501\u7684\u65f6\u5019\uff0c\u4ee5\u524d\u6211\u4eec\u662f\u5148\u5224\u65ad\u9501\u662f\u4e0d\u662f\u81ea\u5df1\u7684\uff0c\u5982\u679c\u662f\u6211\u4eec\u518d\u53bb\u5220\u554a\uff0c\u907f\u514d\u8bef\u5220\u4e86\u3002\u8fd9\u91cc\u5462\u5176\u5b9e\u4e5f\u662f\u7c7b\u4f3c\uff0c\u9996\u5148\u5462\u80af\u5b9a\u4e5f\u5f97\u5148\u5224\u65ad\u9501\u662f\u4e0d\u662f\u81ea\u5df1\u7684\u3002\u5982\u679c\u8bf4\u8fd9\u4e2a\u9501\u6839\u672c\u5c31\u4e0d\u662f\u4f60\u7684\uff0c\u90a3\u8bc1\u660e\u4ec0\u4e48\uff0c\u8bc1\u660e\u4f60\u8fd9\u4e2a\u9501\u554a\u5df2\u7ecf\u91ca\u653e\u4e86\uff0c\u53ef\u80fd\u662f\u8d85\u65f6\u4e86\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u6240\u4ee5\u8bf4\u5462\u8fd9\u79cd\u60c5\u51b5\u4e0b\u4f60\u5c31\u4e0d\u8981\u7ba1\u4e86\u3002\u4f46\u662f\u5982\u679c\u8fd9\u4e2a\u9501\u662f\u81ea\u5df1\u7684\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u8981\u53bb\u91ca\u653e\u4e86\u3002\u5f53\u7136\u8fd9\u4e2a\u91ca\u653e\u4e0d\u662f\u4e0a\u6765\u5c31\u5220\uff0c\u6211\u4eec\u8bb2\u4e86\uff0c\u6211\u4eec\u8981\u5148\u628a\u9501\u7684\u91cd\u590d\u6b21\u6570\u51cf\u4e00\u554a\uff0c\u7136\u540e\u5462\u624d\u80fd\u53bb\u5224\u65ad\u4e00\u4e0b\u4ec0\u4e48\u5462\uff0c\u8fd9\u4e2a\u503c\u662f\u4e0d\u662f\u5df2\u7ecf\u5230\u96f6\u4e86\u554a\u3002\u5982\u679c\u8bf4\u4ed6\u4e0d\u662f\u96f6\uff0c\u90a3\u8bc1\u660e\u554a\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u6839\u672c\u5c31\u4e0d\u662f\u6700\u5916\u5c42\uff0c\u8fd8\u6709\u522b\u7684\u4e1a\u52a1\uff0c\u6240\u4ee5\u8bf4\u6211\u4eec\u4e0d\u80fd\u5220\uff0c\u800c\u662f\u5e72\u4ec0\u4e48\u5462\uff0c\u54ce\uff0c\u91cd\u7f6e\u6709\u6548\u671f\u554a\u3002\u7136\u540e\u53bb\u6267\u884c\u5176\u4ed6\u4e1a\u52a1\u53bb\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\u5462\uff0c\u8fd9\u91cc\u540c\u6837\u9700\u8981\u53bb\u91cd\u7f6e\u9501\u6709\u6548\u671f\u554a\uff0c\u7ed9\u540e\u7eed\u4e1a\u52a1\u6267\u884c\u554a\u7559\u591f\u5145\u8db3\u7684\u6267\u884c\u65f6\u95f4\u554a\u3002\u6bd4\u65b9\u8bf4\u8fd9\u91cc`method1`\uff0c\u5f53`method1`\u4e1a\u52a1\u6267\u884c\u5b8c\u6bd5\uff0c\u6267\u884c\u5230\u91ca\u653e\u9501\u7684\u65f6\u5019\uff0c\u540c\u6837\u8fd8\u4f1a\u8d70\u8fd9\u4e2a\u903b\u8f91\u3002\u9996\u5148\u5462\u91cd\u590d\u6b21\u6570\u51cf\u4e00\u554a\uff0c\u7136\u540e\u5462\u5224\u65ad\u9501\u6807\u8bc6\u770b\u5b83\u662f\u5426\u4e3a\u96f6\uff0c\u7ed3\u679c\u4e00\u5224\u65ad\u5440\uff0c\u54ce\uff0c\u73b0\u5728\u771f\u7684\u662f\u96f6\uff0c\u90a3\u5c31\u8bf4\u660e\u5df2\u7ecf\u5230\u4e86\u6700\u5916\u5c42\u4e86\u3002\u90a3\u8fd9\u4e2a\u65f6\u5019\u5c31\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u7684\u53bb\u91ca\u653e\u9501\u4e86\u3002\u54ce\uff0c\u8fd9\u4e2a\u5462\u5c31\u662f\u6211\u4eec\u6574\u4e2a\u91ca\u653e\u9501\u7684\u4e00\u4e2a\u6d41\u7a0b\u4e86\u3002<\/p>\n\n\n\n
\u90a3\u5927\u5bb6\u53ef\u4ee5\u770b\u5230\u554a\uff0c\u65e0\u8bba\u662f\u83b7\u53d6\u9501\u8fd8\u662f\u91ca\u653e\u9501\uff0c\u8ddf\u4ee5\u524d\u76f8\u6bd4\u554a\uff0c\u662f\u4e0d\u662f\u5c31\u590d\u6742\u5f88\u591a\u4e86\uff1f\u800c\u4e14\u5462\u8fd9\u4e2a\u5730\u65b9\u554a\u4ee3\u7801\u6709\u591a\u4e2a\u6b65\u9aa4\uff0c\u6240\u4ee5\u8bf4\u5440\uff0c\u50cf\u8fd9\u6837\u7684\u903b\u8f91\uff0c\u54b1\u4e0d\u53ef\u80fd\u554a\u518d\u7528Java\u4ee3\u7801\u53bb\u5b9e\u73b0\u4e86\u3002\u90a3\u8fd9\u5957\u4e1c\u897f\u4e00\u5b9a\u8981\u91c7\u7528\u4ec0\u4e48\u54ce\uff0cLua\u811a\u672c\u6765\u786e\u4fdd\u83b7\u53d6\u9501\u548c\u91ca\u653e\u9501\u7684\u539f\u5b50\u6027\u3002\u90a3\u8fd9\u4e2aLua\u811a\u672c\u53c8\u8be5\u600e\u4e48\u5199\u5462\uff1f<\/p>\n\n\n\n
local key = KEYS[1]; -- \u9501\u7684key\nlocal threadId = ARGV[1]; -- \u7ebf\u7a0b\u552f\u4e00\u6807\u8bc6\nlocal releaseTime = ARGV[2]; -- \u9501\u7684\u81ea\u52a8\u91ca\u653e\u65f6\u95f4\n-- \u5224\u65ad\u662f\u5426\u5b58\u5728\nif(redis.call('exists', key) == 0) then\n -- \u4e0d\u5b58\u5728\uff0c\u83b7\u53d6\u9501\n redis.call('hset', key, threadId, '1');\n -- \u8bbe\u7f6e\u6709\u6548\u671f\n redis.call('expire', key, releaseTime);\n return 1; -- \u8fd4\u56de\u7ed3\u679c\nend;\n-- \u9501\u5df2\u7ecf\u5b58\u5728\uff0c\u5224\u65adthreadId\u662f\u5426\u662f\u81ea\u5df1\nif(redis.call('hexists', key, threadId) == 1) then\n -- \u4e0d\u5b58\u5728\uff0c\u83b7\u53d6\u9501\uff0c\u91cd\u5165\u6b21\u6570+1\n redis.call('hincrby', key, threadId, '1');\n -- \u8bbe\u7f6e\u6709\u6548\u671f\n redis.call('expire', key, releaseTime);\n return 1; -- \u8fd4\u56de\u7ed3\u679c\nend;\nreturn 0; -- \u4ee3\u7801\u8d70\u5230\u8fd9\u91cc\uff0c\u8bf4\u660e\u83b7\u53d6\u9501\u7684\u4e0d\u662f\u81ea\u5df1\uff0c\u83b7\u53d6\u9501\u5931\u8d25<\/code><\/pre>\n\n\n\n\u5728\u8fd9\u5462\u6211\u5c31\u5e26\u7740\u5927\u5bb6\u7b80\u5355\u6765\u770b\u4e00\u770b\u554a\uff0c\u6211\u4eec\u5c31\u4e0d\u4e00\u4e2a\u4e00\u4e2a\u53bb\u5199\u4e86\u554a\u3002\u5176\u5b9e\u6d41\u7a0b\u8ddf\u8fd9\u4e9b\u5dee\u4e0d\u591a\u561b\u3002\u9996\u5148\u5462\u5728\u8fd9\u91cc\u6709\u4e09\u4e2a\u53c2\u6570\u554a\uff0c\u8fd9\u91cc\u7684key\u554a\u5c31\u662f\u6211\u4eec\u9501\u7684\u8fd9\u4e2a\u540d\u79f0\u5c31\u662f\u4e2a`lock`\uff0c\u7136\u540e\u8fd9\u91cc\u7684`t1`\u554a\u5c31\u662f\u7ebf\u7a0b\u7684\u6807\u8bc6\uff0c`releaseTime`\u662f\u9501\u7684\u91ca\u653e\u65f6\u95f4\u3002\u4e0e\u4e4b\u524d\u76f8\u6bd4\u554a\uff0c\u8981\u591a\u4e86\u8fd9\u6837\u4e00\u4e2a\u53c2\u6570\uff0c\u4e3a\u4ec0\u4e48\u9700\u8981\u91ca\u653e\u65f6\u95f4\u5462\uff1f\u56e0\u4e3a\u5728\u83b7\u53d6\u9501\u7684\u8fc7\u7a0b\u5f53\u4e2d\uff0c\u6211\u4eec\u8981\u53bb\u8bbe\u7f6e\u6709\u6548\u671f\uff0c\u6240\u4ee5\u8bf4\u5462\u8fd9\u4e2a\u4e5f\u4f5c\u4e3a\u53c2\u6570\u4e4b\u4e00\u4e86\u3002\u7136\u540e\u5462\u811a\u672c\u5c31\u5f00\u59cb\u4e86\u554a\uff0c\u90a3\u811a\u672c\u5f00\u59cb\u4ee5\u540e\uff0c\u9996\u5148\u8981\u5224\u65ad\u7684\u5c31\u662f\u9501\u662f\u5426\u5b58\u5728\uff0c\u6211\u4eec\u8bb2\u7684\u5c31\u662f`lock`\u662f\u5426\u5b58\u5728\uff0c\u4e0d\u662f\u7528`NX`\u554a\uff0c\u662f\u624b\u52a8\u5224\u65ad\u7684\uff0c\u6240\u4ee5\u5728\u8fd9\u91cc\u7528\u4e86`EXISTS`\u547d\u4ee4\uff0c\u90a3\u8fd9\u4e2akey\u5462\u6bd4\u5982\u8bf4\u662f`lock`\uff0c\u8fd9\u91cc\u5c31\u662f`EXISTS lock`\uff0c\u770b\u662f\u5426\u5b58\u5728\u3002\u90a3\u8fd4\u56de\u96f6\u6216\u8005\u4e00\uff0c\u5982\u679c\u662f\u96f6\uff0c\u5c31\u8bc1\u660e\u662f\u4e0d\u5b58\u5728\u597d\u3002\u90a3\u4e0d\u5b58\u5728\uff0c\u8bf4\u660e\u4f60\u662f\u7b2c\u4e00\u4e2a\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u6765\u83b7\u53d6\u9501\uff0c\u5c31\u662f\u5b58\u4e00\u4e2a\u503c\u8fdb\u53bb\u5b58\u50a8\uff0c\u56e0\u4e3a\u662f\u54c8\u5e0c\u7ed3\u6784\uff0c\u6240\u4ee5\u7528\u7684\u662f`HSET`\u597d\uff0c\u6307\u5b9akey\uff0c\u5728\u6307\u5b9a\u7ebf\u7a0b\u6807\u8bc6\uff0c\u5728\u6307\u5b9a\u8fd9\u4e2a\u4e00\uff0c\u4e5f\u5c31\u662f\u7b2c\u4e00\u6b21\u6765\u7684\u65f6\u5019\u505a\u8fd9\u4e2a\u521d\u59cb\u5316\u7684\u52a8\u4f5c\u3002\u8fd9\u4e2a\u5de5\u4f5c\u505a\u5b8c\u4e86\u4ee5\u540e\u5462\uff0c\u4e0d\u8981\u5fd8\u4e86\u8fd8\u8981\u7ed9\u9501\u8bbe\u7f6e\u6709\u6548\u671f\uff0c\u4e5f\u5c31\u662f\u6267\u884c\u8fd9\u4e2a`EXPIRE`\u547d\u4ee4\uff0c\u7136\u540e\u5462\u8bbe\u7f6e\u8fd9\u4e2a\u91ca\u653e\u65f6\u95f4\uff0c\u4e5f\u5c31\u662f`releaseTime`\u3002\u5230\u8fd9\u513f\u5462\u554a\uff0c\u83b7\u53d6\u9501\u5176\u5b9e\u5c31\u7b97\u662f\u6210\u529f\u4e86\u3002\u90a3\u8fd9\u4e00\u90e8\u5206\u554a\u5176\u5b9e\u5bf9\u5e94\u7684\u5c31\u662f\u6211\u4eec\u4f1a\u4e3a\u9501\u79bb\u554a\uff0c\u8fd9\u4e00\u90e8\u5206\u7684\u4e00\u4e2a\u6d41\u7a0b\u554a\uff0c\u4e5f\u5c31\u662f\u8bf4\u662f\u9501\u4e0d\u5b58\u5728\u7684\u60c5\u51b5\u3002\u90a3\u5982\u679c\u8bf4\u9501\u5df2\u7ecf\u5b58\u5728\u4e86\u5462\uff0c\u90a3\u9501\u5982\u679c\u5b58\u5728\uff0c\u6211\u4eec\u5c31\u8981\u53bb\u5224\u65ad\u9501\u6807\u8bc6\u554a\u662f\u4e0d\u662f\u81ea\u5df1\u7684\u3002\u90a3\u600e\u4e48\u5224\u65ad\u5462\uff1f\u5509\uff0c\u8fd9\u91cc\u6211\u4eec\u4f20\u4e86\u4e00\u4e2a\u7ebf\u7a0b\u7684\u6807\u8bc6threadId\uff0c\u4f60\u5c31\u5224\u65ad\u4e00\u4e0b\u8fd9\u4e2a\u6807\u8bc6\u554a\uff0c\u5728\u6211\u4eec\u8fd9\u4e2a\u54c8\u5e0c\u91cc\u8fb9\u5b58\u4e0d\u5b58\u5728\u5c31\u884c\u4e86\u3002\u6240\u4ee5\u8fd9\u91cc\u7528\u4e86`HEXISTS`\u547d\u4ee4\uff0c\u4f20\u8fd9\u4e2akey\uff0c\u4f20\u8fd9\u4e2a\u7ebf\u7a0b\u6807\u8bc6\u3002\u5982\u679c\u8bf4\u5b83\u5b58\u5728\uff0c\u90a3\u4e48\u7ed3\u679c\u5c31\u662f\u4e00\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u8bc1\u660e\u8fd9\u4e2a\u9501\u662f\u81ea\u5df1\u7684\u597d\u3002\u90a3\u9501\u5982\u679c\u662f\u81ea\u5df1\u7684\u5e72\u4ec0\u4e48\u5440\uff1f\u6211\u4eec\u662f\u4e0d\u662f\u9501\u7684\u8fd9\u4e2a\u91cd\u590d\u7684\u6b21\u6570\u8981\u53bb\u52a0\u4e00\u554a\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u91cd\u590d\u6b21\u6570\u52a0\u4e00\uff0c\u6240\u4ee5\u8bf4\u5728\u8fd9\u6267\u884c\u4e86\u4e2a`HINCRBY`\uff0c\u5c31\u662f\u81ea\u589e\u7684\u610f\u601d\u554a\u3002\u90a3\u4e5f\u5c31\u662f\u8bf4\u5bf9\u5e94\u7684\u8fd9\u4e2akey\u5bf9\u5e94\u8fd9\u4e2a\u6807\u8bc6\uff0c\u7136\u540e\u52a0\u4e00\u554a\u3002\u4e5f\u5c31\u662f\u6267\u884c\u8fd9\u4e2a\u52a0\u5b8c\u4e86\u4ee5\u540e\u91cd\u7f6e\u6709\u6548\u671f\uff0c\u6240\u4ee5\u5927\u5bb6\u770b\u53c8\u4e00\u6b21`EXPIRE`\u554a\uff0c\u6240\u4ee5\u5462\u8fd9\u4e00\u6bb5\u903b\u8f91\u5176\u5b9e\u4e5f\u5c31\u662f\u6211\u4eec\u521a\u6362\u7684\u554a\uff0c\u8fd9\u4e00\u6761\u7ebf\u5c31\u8fd9\u6761\u7ebf\u8fd9\u4e2a\u5206\u652f\u3002\u90a3\u4e5f\u662f\u4e00\u79cd\u83b7\u53d6\u9501\u6210\u529f\u7684\u60c5\u51b5\u554a\u3002\u90a3\u6700\u540e\u4e00\u79cd\u60c5\u51b5\u5462\uff0c\u4e5f\u5c31\u662f\u8bf4\u9501\u6807\u8bc6\u4e0d\u662f\u81ea\u5df1\u7684\uff0c\u8ddf\u4f60\u6ca1\u6709\u4efb\u4f55\u5173\u7cfb\uff0c\u4e5f\u5c31\u9501\u5c31\u5931\u8d25\u4e86\u3002\u90a3\u4e5f\u5c31\u662f\u505a\u5230\u8fd9`return 0`\uff0c\u6240\u4ee5\u5728\u8fd9\u6574\u4e2a\u6d41\u7a0b\u91cc\u8fb9\u554a\uff0c\u8fd4\u56de\u4e00\u7684\u5c31\u662f\u6210\u529f\u4e86\uff0c\u96f6\u5c31\u662f\u5931\u8d25\u7684\u597d\u3002\u8fd9\u662f\u83b7\u53d6\u9501\u7684\u4e00\u4e2a\u6d41\u7a0b\u4e86\u3002<\/p>\n\n\n\n
\u90a3\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0b\u91ca\u653e\u9501\u3002\u91ca\u653e\u9501\u5462\u4e5f\u5c31\u662f\u6211\u4eec\u7684\u4e0b\u534a\u90e8\u5206\u554a\uff0c\u9996\u5148\u540c\u6837\u662f\u8fd9\u4e09\u4e2a\u53c2\u6570\u554a\uff0ckey\u6570\u5b57\u540d\u79f0\uff0c\u7ebf\u7a0b\u6807\u8bc6\u9501\u7684\u91ca\u653e\u65f6\u95f4\u3002\u4e00\u4e0a\u6765\u4ee5\u540e\u554a\uff0c\u540c\u6837\u6211\u4eec\u8981\u5148\u53bb\u505a\u8fd9\u4e2a\u5224\u65ad\uff0c\u5224\u65ad\u4ec0\u4e48\u5462\uff1f\u5224\u65ad\u8fd9\u4e2a\u9501\u7684\u6807\u8bc6\u662f\u4e0d\u662f\u81ea\u5df1\u554a\u3002\u90a3\u540c\u6837\u5462\u5c31\u662f\u62ff\u7740\u7ebf\u7a0bid\u7559`EXISTS`\u53bb\u5224\u65ad\u554a\uff0c\u653e\u5b8c\u4e86\u540e\uff0c\u5982\u679c\u662f\u4e00\u5c31\u662f\u81ea\u5df1\uff0c\u5982\u679c\u662f\u96f6\uff0c\u90a3\u5c31\u4e0d\u662f\u81ea\u5df1\u3002\u4e0d\u662f\u81ea\u5df1\u5c31\u8d70\u5728\u8fd9\u6761\u8def\uff0c\u903b\u8f91\u5427\uff0c\u4ee3\u8868\u9501\u600e\u4e48\u4e86\uff0c\u662f\u4e0d\u662f\u5df2\u7ecf\u88ab\u91ca\u653e\u6389\u4e86\uff1f\u5509\uff0c\u6ca1\u9519\u554a\u3002\u597d\u7136\u540e\u5f80\u4e0b\u8d70\uff0c\u8fd9\u4e2a\u65f6\u5019\u5462\u90a3\u5c31\u8bc1\u660e\u9501\u662f\u81ea\u5df1\u7684\u554a\uff0c\u56e0\u4e3a\u4e0a\u9762\u4e0d\u6210\u7acb\uff0c\u5f80\u4e0b\u8d70\u662f\u4e0d\u662f\u9501\u662f\u81ea\u5df1\u3002\u5982\u679c\u9501\u662f\u81ea\u5df1\u600e\u4e48\u529e\uff0c\u80fd\u505a\u51fa\u7b80\u6613\u9664\u6570\u51cf\u4e00\u600e\u4e48\u51cf\uff0c\u8fd8\u662f`HINCRBY`\uff0c\u53ea\u4e0d\u8fc7\u8fd9\u91cc\u6539\u6210-1\u554a\uff0c`HINCRBY`\u662f\u81ea\u589e\u5417\uff0c\u589e\u51cf\u589e-1\u4e0d\u5c31\u662f\u51cf\u4e00\u5417\uff1f\u54ce\uff0c\u91cd\u590d\u6b21\u6570\u51cf\u4e00\u5b8c\u4e86\u53bb\u5224\u65ad\u6807\u8bc6\u554a\uff0c\u662f\u4e0d\u662f\u96f6\uff1f\u90a3\u8fd9\u4e2a\u65f6\u5019\u5c31\u662f\u770b\u5b83\u662f\u5426\u5927\u4e8e\u96f6\u554a\u3002\u4f46\u5982\u679c\u5927\u4e8e\u96f6\uff0c\u8bc1\u660e\u4ec0\u4e48\uff0c\u8bc1\u660e\u73b0\u5728\u8fd8\u6ca1\u6709\u5230\u6700\u5916\u5c42\uff0c\u662f\u4e0d\u662f\u5e94\u8be5\u53bb\u91cd\u7f6e\u6709\u6548\u671f\u554a\uff1f\u7136\u540e\u53bb\u6267\u884c\u4e1a\u52a1\u5440\u3002\u6240\u4ee5\u5728\u8fd9`EXPIRE`\u91cd\u7f6e\u6709\u6548\u671f\u3002\u90a3\u8fd9\u4e00\u90e8\u5206\u903b\u8f91\uff0c\u540c\u5b66\u4eec\u5176\u5b9e\u5c31\u5bf9\u5e94\u4e86\u8fd9\u91cc\u5f00\u59cb\u554a\uff0c\u8fd9\u4e00\u6761\u5206\u652f\u5bf9\u5427\u3002\u90a3\u5982\u679c\u8bf4\u6211\u4eec\u6700\u7ec8\u7684\u5224\u65ad\u5b83\u662f\u96f6\u5462\uff1f\u662f\u96f6\u662f\u4e0d\u662f\u5c31\u53ef\u4ee5\u53bb\u91ca\u653e\u9501\u505a\u8fd9\u4e2a`DEL`\u7684\u64cd\u4f5c\u4e86\uff1f\u6240\u4ee5\u554a\u8fd9\u4e00\u6bb5\u903b\u8f91\u5bf9\u5e94\u7684\uff0c\u5176\u5b9e\u5c31\u662f\u4ece\u8fd9\u5f00\u59cb\u7684\u8fd9\u90e8\u5206\u3002ok\uff0c\u90a3\u6574\u4e2a\u811a\u672c\u6211\u4eec\u5c31\u770b\u5b8c\u4e86\u3002<\/p>\n\n\n\n
\u90a3\u4e48\u6211\u4eec\u7684Redisson\u554a\u662f\u4e0d\u662f\u8fd9\u4e48\u5b9e\u73b0\u7684\u5462\uff1f\u4e0b\u9762\u5462\u6211\u4eec\u5c31\u4e00\u8d77\u8ddf\u8e2a\u4e00\u4e0b\u6e90\u7801\u6765\u770b\u4e00\u4e0b\u3002\u597d\uff0c\u6211\u4eec\u6253\u5f00IDEA\uff0c\u5728\u8fd9\u5462\u6211\u63d0\u524d\u51c6\u5907\u597d\u4e86\u4e00\u4e2a\u5355\u5143\u6d4b\u8bd5\u554a\uff0c\u8fd9\u91cc\u662fRedisson\u63d0\u4f9b\u7684\u4e00\u4e2a\u9501\uff0c\u7136\u540e\u5462\u5728`method1`\u65b9\u6cd5\u5f53\u4e2d\u554a\uff0c\u6211\u4f1a\u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u7136\u540e\u4f1a\u53bb\u5931\u8d25\u4e86\uff0c\u5c31\u7ed3\u675f\uff0c\u4f1a\u6210\u529f\u4e86\uff0c\u6211\u5c31\u53eb`method2`\uff0c\u5728`method2`\u91cc\u518d\u6b21\u83b7\u53d6\u9501\uff0c\u7136\u540e\u5462\u53bb\u6267\u884c\u4e1a\u52a1\uff0c\u6700\u540e\u91ca\u653e\u9501\u3002\u8fd9\u5c31\u662f\u4e00\u4e2a\u53ef\u91cd\u5165\u7684\u4e00\u4e2ademo\u4e86\u5bf9\u5427\u3002\u4e0b\u9762\u5462\u6211\u4eec\u5728\u8fd9\u6253\u4e0a\u4e00\u4e2a\u65ad\u70b9\u554a\uff0c\u53bb\u8fd0\u884c\u4e00\u4e0b\uff0c\u770b\u4e00\u4e0b\u554a\u3002\u5728\u8fd9\u5462\u6211\u4eec\u8d70debug\uff0c\u597d\u8fdb\u5165\u7684\u70b9\uff0c\u7136\u540e\u8fd9\u91cc\u5462\u6211\u4eec\u53bb\u653e\u884c\u4e00\u4e0b\uff0c\u8d70\u597d\u56de\u9501\u6210\u529f\u662f\u4e2a`true`\u5bf9\u5427\u3002\u6211\u4eec\u6253\u5f00\u8fd9\u4e2a\u684c\u9762\u5ba2\u6237\u7aef\u5237\u65b0\u4e00\u4e0b\uff0c\u53ef\u4ee5\u770b\u5230\u5462\u8fd9\u91cc\u6709\u4e2a`order`\u7684\uff0c\u56e0\u4e3a\u6211\u4eec\u9501\u540d\u79f0\u8d77\u7684\u662f`order`\uff0c\u53ef\u4ee5\u770b\u5230\u8fd9\u91cc\u8fb9\u6709\u4e00\u4e2akey\uff0c\u8fd9\u4e2a\u5c31\u662f\u90a3\u4e2a\u9501\u7684\u6807\u8bc6\u554a\uff0c\u540e\u9762\u5462\u662f\u4e00\u4e2avalue\u503c\u4e3a\u4e00\uff0c\u5c31\u662f\u91cd\u590d\u6b21\u6570\u4e3a\u4e00\u561b\u3002\u8fd9\u6837\u5462\u6211\u4eec\u5f80\u4e0b\u8d70\uff0c\u7136\u540e\u8d70\u8d70\u8fdb\u5165`method2`\uff0c\u8fdb\u5165`method2`\uff0c\u53c8\u4e00\u6b21\u4f1a\u9501\uff0c\u4f60\u770b\u53c8\u662f`true`\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u90a3\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0bRedis\uff0c\u597d\uff0c\u6765\u5728\u8fd9\u5237\u65b0\u4e00\u4e0b\u554a\u3002\u597d\u5927\u5bb6\u770b\u770b\u5230\u503c\u662f\u4e0d\u662f\u53d8\u6210\u4e8c\u4e86\uff0c\u4e5f\u5c31\u662f\u8bf4\u91cd\u5165\u6b21\u6570\u662f\u4e0d\u662f\u52a0\u4e86\u4e00\u54ce\uff0c\u6ca1\u95ee\u9898\u554a\u3002\u597d\u5f80\u4e0b\u8d70\uff0c\u7136\u540e\u62ff\u8d70\u8d70\u5230\u8fd9\u91cc\u5f80\u4e0b\u91ca\u653e\u9501\uff0c\u90a3\u4e48\u91ca\u653e\u9501\u4ee5\u540e\u91cd\u7f6e\u6b21\u6570\u5e94\u8be5\u4f1a\u51cf\u4e00\uff0c\u5bf9\u4e0d\u5bf9\uff1f\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0b\uff0c\u5728\u8fd9\u91cc\u554a\uff0c\u518d\u53bb\u91cd\u7f6e\u4e00\u4e0b\uff0c\u770b\u662f\u4e0d\u662f\u51cf\u4e00\u4e86\uff1f\u5509\uff0c\u6ca1\u6709\u771f\u7684\u5220\u9664\u554a\uff0c\u662f\u51cf\u4e00\uff0c\u7136\u540e\u51fa\u6765\u51fa\u6765\u4ee5\u540e\u53c8\u56de\u5230\u4e86\u8c01\uff0c\u56de\u5230\u4e86`method1`\uff0c\u5728`method1`\u91cc\uff0c\u4ed6\u5f80\u4e0b\u8d70\u4e5f\u4f1a\u53bb\u91ca\u653e\u9501\uff0c\u90a3\u4e48\u8fd9\u6b21\u91ca\u653e\u9501\u518d\u770b\u597d\uff0c\u56de\u6765\u8fd9\u91cc\u518d\u70b9\u4e00\u6b21\u662f\u4e0d\u662f\u5c31\u6ca1\u6709\u4e86\uff1f\u8bf4\u660e\u8fd9\u4e2a\u9501\u88ab\u5220\u9664\u4e86\u3002\u6240\u4ee5\u8fd9\u5c31\u662f\u6211\u4eec\u521a\u521a\u5206\u6790\u7684\u90a3\u4e2a\u903b\u8f91\u554a\uff0c\u901a\u8fc7\u91cd\u590d\u6b21\u6570\u6765\u53bb\u8bb0\u5f55\u8fd9\u4e2a\u53ef\u91cd\u5165\u9501\u597d\uff0c\u6574\u4e2a\u6d41\u7a0b\u5462\u5c31\u5206\u6790\u5b8c\u6bd5\u4e86\u554a\u3002<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/165abcc2c6404c379130a2f5b832bda9.png\")
<\/p>\n\n\n\n\u6765\u770b\u4e00\u4e0b\u6574\u4e2a\u8fd9\u91cc\u4e5f\u662f\u6309\u7167\u6211\u4eec\u521a\u624d\u5206\u6790\u7684\uff0c\u5148\u662f\u9501`method1`\uff0c\u7136\u540e\u5462\u9501`method2`\u6267\u884c\u4e1a\u52a1\u4e8c\uff0c\u4e16\u8d38\u9501`method2`\u6267\u884c\u4e1a\u52a1\u4e00\uff0c\u4e16\u8d38\u9501`method1`\uff0c\u5c31\u662f\u6309\u7167\u4e00\u4e2a\u91cd\u590d\u7684\u4e00\u4e2a\u6d41\u7a0b\u5427\uff0c\u6ca1\u6709\u95ee\u9898\u3002\u90a3\u4e48\u6211\u4eec\u4e5f\u53ef\u4ee5\u53bb\u8ddf\u8e2a\u4e00\u4e0b\u6211\u4eecRedisson\u7684\u6e90\u7801\uff0c\u6765\u770b\u4e00\u4e0b\u54c8\u3002`tryLock`\uff0c\u90a3\u4e48\u5728`tryLock`\u91cc\uff0c\u6211\u4eec\u5f80\u4e0b\u8ddf\u627e\u5230\u5b83\u7684\u5b9e\u73b0\u7c7b\u554a\uff0c\u8fd9\u91cc\u6211\u4eec\u91c7\u7528\u7684\u662f\u4e00\u4e2a\u6700\u666e\u901a\u7684`RLock`\u5bf9\u5427\u3002\u597d\u5728\u8fd9\u5462\u6389\u4e86\u4e00\u4e2a`getLock`\uff0c\u91cc\u8fb9\u6709\u4e2a`tryLockInner`\uff0c\u6211\u4eec\u6839\u636e\u8fd9\u4e2a\u5728\u8fd9\u4e2a\u65b9\u6cd5\u91cc\u9762\u7ee7\u7eed\u878d\u5165\u8fdb\u53bb\uff0c\u8fd9\u91cc\u5462`tryAcquireOnce`\u8d70\uff0c\u90a3\u5728\u8fd9\u91cc\u5462\u4ed6\u4f1a\u5148\u5224\u65ad\u8fd9\u4e2a`leaseTime`\u662f\u5426\u7b49\u4e8e-1\uff0c\u8fd9`leaseTime`\u5440\uff0c\u5c31\u662f\u6211\u4eec\u4e4b\u524d\u8bb2\u8fc7\u7684\u9501\u81ea\u52a8\u91ca\u653e\u7684\u4e00\u4e2a\u65f6\u95f4\u3002\u8fd9\u91cc\u5176\u5b9e\u6211\u4eec\u662f\u6ca1\u6709\u4f20\u7684\uff0c\u90a3\u5728\u6ca1\u4f20\u7684\u60c5\u51b5\u4e0b\uff0c\u5927\u5bb6\u53ef\u4ee5\u770b\u5230\u4ed6\u7ed9\u7684\u662f\u4e00\u4e2a-1\u554a\u3002\u6240\u4ee5\u8bf4\u5462\u5728\u8fdb\u5165\u8fd9\u4e2a\u65b9\u6cd5\u4ee5\u540e\u554a\uff0c\u4ed6\u53bb\u5224\u65ad\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u5730\u65b9\u80af\u5b9a\u4e0d\u6210\u7acb\uff0c\u90a3\u4e8e\u662f\u5462\u5c31\u4f1a\u5f80\u4e0b\u8d70\uff0c\u8d70\u5230\u8fd9\u884c\uff0c\u90a3\u8fd9\u4e00\u884c\u5462\u4ed6\u4f1a\u53bb`tryLock`\uff0c\u4e5f\u5c31\u662f\u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u6240\u5176\u5b9e\u554a\u8ddf\u8fd9\u5757\u4e24\u4e2a\u903b\u8f91\u662f\u4e00\u6837\u7684\uff0c\u53ea\u4e0d\u8fc7\u5462\u5982\u679c\u8bf4\u4f60\u7ed9\u4e86\u91ca\u653e\u65f6\u95f4\uff0c\u4ed6\u5c31\u4f1a\u7528\u4f60\u7ed9\u7684\u90a3\u4e2a\u503c\u554a\u3002\u5982\u679c\u4f60\u6ca1\u7ed9\uff0c\u4ed6\u4f1a\u8d70\u4e00\u4e2a\u9ed8\u8ba4\u503c\u3002\u6240\u4ee5\u6700\u7ec8\u5462\u90fd\u662f\u4f1a\u8fdb\u5230\u8fd9\u4e2a\u65b9\u6cd5\u554a\uff0c\u90a3\u6211\u4eec\u8ddf\u8fdb\u53bb\u597d\uff0c\u8fd8\u662f\u8fd9\u4e2a`releaseLock`\u3002\u8fdb\u6765\u4e86\uff0c\u8fdb\u6765\u4ee5\u540e\u5462\uff0c\u5927\u5bb6\u5c31\u4f1a\u770b\u5230\u8fd9\u91cc\u6709\u4e00\u6bb5\u903b\u8f91\uff0c\u8fd9\u6bb5\u903b\u8f91\u554a\u5c31\u662f\u4e00\u4e2aLua\u811a\u672c\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230Redisson\u5462\u662f\u628a\u8fd9\u4e2a\u811a\u672c\u554a\u901a\u8fc7\u5b57\u7b26\u4e32\u4e5f\u662f\u76f4\u63a5\u5199\u6b7b\u7684\uff0c\u4e0d\u9700\u8981\u6211\u4eec\u4e4b\u524d\u662f\u901a\u8fc7\u4e00\u4e2a\u6587\u4ef6\u554a\uff0c\u554a\u8fd9\u79cd\u65b9\u5f0f\u5176\u5b9e\u4e5f\u53ef\u4ee5\u3002\u90a3\u8fd9\u6bb5\u811a\u672c\u5462\u5927\u5bb6\u5982\u679c\u4ed4\u7ec6\u53bb\u770b\u554a\uff0c\u8ddf\u6211\u4eec\u521a\u521aPPT\u4e0a\u7684\u811a\u672c\u5c31\u662f\u4e00\u6837\u7684\u3002\u9996\u5148\u5224\u65ad\u9501\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u7b49\u4e8e\u96f6\uff0c\u4ee3\u8868\u4e0d\u5b58\u5728\uff0c\u4e0d\u5b58\u5728\u600e\u4e48\u529e\u5440\uff1f\u54ce\uff0c\u5f53\u7136\u662f\u53bb\u83b7\u53d6\u9501\u4e86\u3002\u4ed6\u5728\u8fd9\u4e2a\u5730\u65b9\u662f\u76f4\u63a5`HINCRBY`\u4e86\uff0c\u4e5f\u5c31\u662f\u81ea\u589e\u4e00\u81ea\u589e\u4e00\u554a\uff0c\u5982\u679c\u4f60\u4e0d\u5b58\u5728\uff0c\u5b83\u4f1a\u81ea\u52a8\u5e2e\u4f60\u521b\u5efa\u554a\uff0c\u6240\u4ee5\u8ddf\u90a3\u4e2a`HSET`\u7684\u6548\u679c\u662f\u4e00\u6837\u7684\u3002\u7d27\u63a5\u7740\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u7136\u540e\u5462\u7ed3\u675f\u597d\uff0c\u8fd9\u662f\u4e0d\u5b58\u5728\uff0c\u76f4\u63a5\u56de\u6eaf\u3002\u90a3\u5982\u679c\u5b58\u5728\u5462\uff0c\u5b58\u5728\u4e5f\u4e0d\u8981\u7d27\uff0c\u6211\u5224\u65ad\u4e00\u4e0b\u8fd9\u4e2a\u9501\u662f\u4e0d\u662f\u81ea\u5df1\u7b49\u4e8e\u4e00\uff0c\u4ee3\u8868\u662f\u81ea\u5df1\u662f\u81ea\u5df1\u600e\u4e48\u529e\uff0c\u540c\u6837\u662f\u52a0\u4e00\uff0c\u7136\u540e\u8bd5\u7740\u8fc7\u671f\u65f6\u95f4\uff0c\u7136\u540e\u7ed3\u675f\u3002\u6240\u4ee5\u8fd9\u4e24\u4e2a\u5c31\u662f\u83b7\u53d6\u9501\u6210\u529f\u7684\u60c5\u51b5\u3002\u90a3\u5176\u4ed6\u60c5\u51b5\u5c31\u662f\u5931\u8d25\u4e86\u3002<\/p>\n\n\n\n
\u597d\uff0c\u90a3\u4e48\u8fd9\u4e2a\u6d41\u7a0b\u5c31\u770b\u5b8c\u4e86\u3002\u90a3\u7136\u540e\u5462\u6211\u4eec\u518d\u6765\u770b\u4e00\u4e0b\u91ca\u653e\u9501\u554a\uff0c\u6211\u518d\u56de\u6765\u3002\u90a3\u91ca\u653e\u9501\u4e0a\u8d70\u7684\u662f\u8fd9\u4e2a`unlock`\uff0c\u6211\u4eec\u8ddf\u8fdb\u53bb\u3002\u90a3\u4e48`unlock`\u80fd\u7ec4\u7684`RLock`\u554a\uff0c\u9996\u5148\u5728\u8fd9\u91cc\u8c03\u7528\u8fd9\u4e2a`unlockSync`\uff0c\u7ee7\u7eed\u8ddf\u5165\u3002\u5728\u8fd9\u91cc\u6211\u4eec\u7ee7\u7eed\u8ddf\u8fd9\u4e2a`unlockEnterSync`\uff0c\u597d\u91ca\u653e\uff0c\u540c\u6837\u662f\u627e\u5230\u8fd9\u4e2a`RLock`\u91cc\u9762\u3002\u5927\u5bb6\u53ef\u4ee5\u770b\u5230\u540c\u6837\u6709\u4e00\u6bb5Lua\u811a\u672c\uff0c<\/p>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/69008a8895c2449cad244436f479c349.png\")
<\/p>\n\n\n\n\u90a3\u4e48\u8fd9\u6bb5Lua\u811a\u672c\u554a\uff0c\u5c31\u662f\u6211\u4eec\u521a\u521a\u5206\u6790\u7684\u4e00\u6bb5\u554a\u3002\u9996\u5148\u4e00\u6837\u5148\u5224\u65ad\u9501\u662f\u4e0d\u662f\u81ea\u5df1\u7684\u554a\uff0c\u662f\u5426\u5b58\u5728\u597d\u3002\u5982\u679c\u8bf4\u5462\u5b83\u7b49\u4e8e\u96f6\uff0c\u5c31\u662f\u4e0d\u5b58\u5728\uff0c\u90a3\u5c31\u76f4\u63a5\u7ed3\u675f\u4e86\u554a\u3002\u56e0\u4e3a\u8fd9\u79cd\u5c31\u662f\u8bf4\u9501\u65e9\u5c31\u5df2\u7ecf\u91ca\u653e\u4e86\uff0c\u4f60\u5c31\u4e0d\u7528\u7ba1\u4e86\u3002\u7136\u540e\u5462\u54ce\u8ba9\u4ed6\u9501\u62bd\u7684\u6b21\u6570\u51cf\u4e00\uff0c\u4f60\u770b`HINCRBY`\uff0c\u7136\u540e-1\uff0c\u8fd9\u5c31\u662f\u51cf\u4e00\u7684\u610f\u601d\u3002\u89e3\u5b8c\u4e86\u4ee5\u540e\u554a\uff0c\u5224\u65ad\u4e00\u4e0b\u9501\u91cd\u5165\u6b21\u6570\u662f\u4e0d\u662f\u96f6\u3002\u5982\u679c\u5927\u4e8e\u96f6\u554a\uff0c\u8bc1\u660e\u597d\u6211\u4eec\u73b0\u5728\u8fd8\u4e0d\u5728\u6700\u4e0b\u5c42\uff0c\u600e\u4e48\u529e\uff0c\u91cd\u7f6e\u6709\u6548\u671f`EXPIRE`\uff0c\u90a3\u8fd9\u4e00\u90e8\u5206\u903b\u8f91\uff0c\u540c\u5b66\u4eec\u5176\u5b9e\u5c31\u5bf9\u5e94\u4e86\u8fd9\u91cc\u5f00\u59cb\u554a\uff0c\u8fd9\u4e00\u6761\u5206\u652f\u5bf9\u5427\u3002\u90a3\u5982\u679c\u8bf4\u6211\u4eec\u6700\u7ec8\u7684\u5224\u65ad\u5b83\u662f\u96f6\u5462\uff0c\u662f\u96f6\u662f\u4e0d\u662f\u5c31\u53ef\u4ee5\u53bb\u91ca\u653e\u9501\u505a\u8fd9\u4e2a`DEL`\u5220\u9664\u4ed6\u3002\u8fd9\u91cc\u8fd8\u6267\u884c\u4e86\u4e00\u4e2a`PUBLISH`\uff0c\u8fd9\u4e2a\u662f\u5e72\u4ec0\u4e48\u7684\uff1f\u540e\u9762\u6211\u4eec\u4f1a\u8bb2\u4ed6\u5176\u5b9e\u662f\u53d1\u4e86\u4e00\u6761\u6d88\u606f\u554a\uff0c\u4e5f\u5c31\u662f\u53bb\u901a\u77e5\u5927\u5bb6\u8fd9\u4e2a\u9501\u6211\u91ca\u653e\u4e86\u3002\u90a3\u6709\u4ec0\u4e48\u7528\u5462\uff1f\u540e\u8fb9\u6211\u4eec\u518d\u53bb\u7ed9\u5927\u5bb6\u8bb2\u597d\u4e86\u3002<\/p>\n\n\n\n
\u6211\u4eec\u56de\u5230PPT\uff0c\u5230\u8fd9\u513f\u5462\u554aRedisson\u53ef\u91cd\u5165\u9501\u7684\u8fd9\u4e2a\u539f\u7406\uff0c\u6211\u4eec\u5c31\u5206\u6790\u5b8c\u6bd5\u4e86\u3002\u83b7\u53d6\u9501\u548c\u91ca\u653e\u9501\u7684\u6574\u4e2a\u6d41\u7a0b\u554a\uff0c\u5728\u8fd9\u91cc\u901a\u8fc7\u8fd9\u5e45\u56fe\u554a\u5c31\u7ed9\u5927\u5bb6\u8bb2\u8ff0\u5b8c\u6bd5\u4e86\u3002\u5176\u6838\u5fc3\u5c31\u662f\u5229\u7528\u4e00\u4e2a\u54c8\u5e0c\u7ed3\u6784\u554a\uff0c\u7136\u540e\u53bb\u8bb0\u5f55\u83b7\u53d6\u9501\u7684\u7ebf\u7a0b\u4ee5\u53ca\u91cd\u5165\u7684\u6b21\u6570\uff0c\u4e0e\u6211\u4eec\u554a`ReentrantLock` JDK\u91cc\u9762\u63d0\u4f9b\u54ea\u4e2a\uff0c\u5b83\u7684\u539f\u7406\u662f\u4e00\u81f4\u7684\u3002\u597d\u4e86\uff0c\u90a3\u6211\u4eec\u8fd9\u8282\u8bfe\u7684\u5185\u5bb9\u554a\uff0c\u5c31\u5230\u8fd9\u91cc\u3002\u4e0b\u8282\u8bfe\u5462\u6211\u4eec\u7ee7\u7eed\u53bb\u5206\u6790\u554aRedisson\u5b83\u63d0\u4f9b\u7684\u5176\u4ed6\u7684\u4e00\u4e9b\u529f\u80fd\u3002<\/p>\n\n\n\n
redisson\u5982\u4f55\u89e3\u51b3\u4e09\u5927\u95ee\u9898\uff1f<\/h3>\n\n\n\n
01
\u4e0d\u53ef\u91cd\u5165
\u540c\u4e00\u4e2a\u7ebf\u7a0b\u65e0\u6cd5\u591a\u6b21\u83b7\u53d6\u540c\u628a\u9501<\/p>\n\n\n\n02
\u4e0d\u53ef\u91cd\u8bd5
\u83b7\u53d6\u9501\u53ea\u5c1d\u8bd5\u4e00\u6b21\u5c31\u8fd4\u56defalse\uff0c\u6ca1\u6709\u91cd\u8bd5\u673a\u5236<\/p>\n\n\n\n03
\u8d85\u65f6\u91ca\u653e
\u9501\u8d85\u65f6\u91ca\u653e\u867d\u7136\u53ef\u4ee5\u907f\u514d\u6b7b\u9501\uff0c\u4f46\u5982\u679c\u662f\u4e1a\u52a1\u6267\u884c\u8017\u65f6\u8f83\u957f\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u9501\u91ca\u653e\uff0c\u5b58\u5728\u5b89\u5168\u9690\u60a3<\/p>\n\n\n\n04
\u4e3b\u4ece\u4e00\u81f4\u6027
\u5982\u679cRedis\u63d0\u4f9b\u4e86\u4e3b\u4ece\u96c6\u7fa4\uff0c\u4e3b\u4ece\u540c\u6b65\u5b58\u5728\u5ef6\u8fdf\uff0c\u5f53\u4e3b\u5ca9\u673a\u65f6\uff0c\u5982\u679c\u4ece\u5e76\u540c\u6b65\u4e3b\u4e2d\u7684\u9501\u6570\u636e\uff0c\u5219\u4f1a\u51fa\u73b0\u9501\u5b9e\u73b0<\/p>\n\n\n\n\u5b9e\u6218\u7bc7-20.\u5206\u5e03\u5f0f\u9501-Redisson\u7684\u9501\u91cd\u8bd5\u548cWatchDog\u673a\u5236_\u54d4\u54e9\u54d4\u54e9_bilibili<\/a>\u8be6\u7ec6\u9610\u8ff0\u7684RedissonLock.java\u7684\u5b8c\u6574\u6d41\u7a0b\u7684\u5168\u90e8\u4ee3\u7801\uff0c\u54ce\u5440\u611f\u6168\u524d\u4eba\u7684\u667a\u6167\uff0c\u542c\u8bf4\u4ee3\u7801\u968f\u60f3\u5f55\u661f\u7403\u91cc\u9762\u8fd8\u6709\u4ec0\u4e48\u624b\u6413spring\uff0cRPC\u54ce\u5440\u6211\u64cd\uff0c\u8fd9\u5c31\u662fcpp\u9009\u624b\u7684\u9ad8\u6df1\uff0c\u91cd\u89c6\u5e95\u5c42\u4ee3\u7801<\/p>\n\n\n\n
- \u60b2\u89c2\u9501
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/0b950e31ca0c4e1aa7d1ea00f50c97ca.png\")
<\/p>\n\n\n\n![\"\"](\"https:\/\/i-blog.csdnimg.cn\/direct\/4aa099ef8bf047a797468fbbadad78c3.png\")
<\/p>\n\n\n\n