![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/fbc44bcd27cca5f489a64680eb3fe72b.png\")
<\/p>\n\n\n\n20240826_dev_coupon-template-query_cache_ding.ma<\/p>\n\n\n\n
\u5728\u5206\u53d1\u670d\u52a1\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u8c03\u7528\u4f18\u60e0\u5238\u6a21\u677f\u7684\u76f8\u5173\u4fe1\u606f\u3002\u4e3a\u4e86\u907f\u514d\u5404\u4e2a\u670d\u52a1\u4e2d\u91cd\u590d\u5b9e\u73b0\u6a21\u677f\u67e5\u8be2\u529f\u80fd\uff0c\u6211\u4eec\u9996\u5148\u7f16\u5199\u4e86\u4e00\u4e2a\u901a\u7528\u7684\u5f15\u64ce\u5c42\u6a21\u677f\u67e5\u8be2\u65b9\u6cd5\uff0c\u4ee5\u652f\u6301 C \u7aef\u7528\u6237\u548c\u5185\u90e8\u5e94\u7528\u7684\u67e5\u8be2\u3002\u50cf\u8fd9\u79cd\u5927\u6d41\u91cf\u7684\u63a5\u53e3\uff0c\u80af\u5b9a\u662f\u9700\u8981\u653e\u5230\u7f13\u5b58\u7684\u3002<\/p>\n\n\n\n
\u7528\u6237\u5e38\u89c4\u8bbf\u95ee\u4f18\u60e0\u5238\u6a21\u677f\u65f6\u5e8f\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n
<\/p>\n\n\n\n
\u7f13\u5b58\u51fb\u7a7f\u6307\u5728\u9ad8\u5e76\u53d1\u7684\u7cfb\u7edf\u4e2d\uff0c\u4e00\u4e2a\u70ed\u70b9\u6570\u636e\u7f13\u5b58\u8fc7\u671f\u6216\u8005\u5728\u7f13\u5b58\u4e2d\u4e0d\u5b58\u5728<\/strong>\uff0c\u5bfc\u81f4\u5927\u91cf\u5e76\u53d1\u8bf7\u6c42\u76f4\u63a5\u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u4ece\u800c\u7ed9\u6570\u636e\u5e93\u9020\u6210\u5de8\u5927\u538b\u529b\uff0c\u751a\u81f3\u53ef\u80fd\u5f15\u8d77\u5b95\u673a\u3002<\/p>\n\n\n\n \u5177\u4f53\u6765\u8bf4\uff0c\u5f53\u67d0\u4e2a\u70ed\u70b9\u6570\u636e\u5728\u7f13\u5b58\u4e2d\u8fc7\u671f\u65f6\uff0c\u5982\u679c\u6b64\u65f6\u6709\u5927\u91cf\u5e76\u53d1\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u8fd9\u4e2a\u6570\u636e<\/strong>\uff0c\u7531\u4e8e\u7f13\u5b58\u4e2d\u4e0d\u5b58\u5728\uff0c\u6240\u6709\u8bf7\u6c42\u90fd\u4f1a\u76f4\u63a5\u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u5bfc\u81f4\u6570\u636e\u5e93\u8d1f\u8f7d\u6025\u5267\u589e\u52a0\u3002<\/p>\n\n\n\n \u4f2a\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n \u4e00\u822c\u6765\u8bf4\uff0c\u6211\u4eec\u4f1a\u901a\u8fc7\u9884\u70ed\u548c\u7f13\u5b58\u6c38\u4e0d\u8fc7\u671f\u7684\u673a\u5236\u8ba9\u7f13\u5b58\u4e0d\u51fb\u7a7f\uff0c\u8fd9\u6837\u5373\u4f7f\u518d\u5927\u7684\u6d41\u91cf\u4e5f\u53ef\u4ee5\u901a\u8fc7\u7f13\u5b58\u53bb\u6297\u3002<\/p>\n\n\n\n \u4e0a\u9762\u4e24\u4e2a\u4e00\u822c\u90fd\u662f\u642d\u914d\u4e00\u8d77\u4f7f\u7528\u7684\u3002\u7b49\u5bf9\u5e94\u70ed\u70b9\u7f13\u5b58\u7684\u6d3b\u52a8\u7ed3\u675f\u540e\uff0c\u8fd9\u4e9b\u6570\u636e\u8bbf\u95ee\u91cf\u5c31\u6bd4\u8f83\u4f4e\u4e86\uff0c\u53ef\u4ee5\u901a\u8fc7\u540e\u53f0\u4efb\u52a1\u7684\u65b9\u6848\u5bf9\u6307\u5b9a\u7f13\u5b58\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u8fd9\u6837\u53ef\u4ee5\u6709\u6548\u964d\u4f4e Redis \u5b58\u50a8\u538b\u529b\u3002<\/p>\n\n\n\n \u5206\u5e03\u5f0f\u9501\u7684\u89e3\u51b3\u65b9\u6848\u5c31\u662f\u4fdd\u8bc1\u53ea\u6709\u4e00\u4e2a\u8bf7\u6c42\u53ef\u4ee5\u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u5176\u5b83\u8bf7\u6c42\u7b49\u5f85\u7ed3\u679c<\/strong>\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u5927\u91cf\u7684\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n \u5728\u539f\u6709\u57fa\u7840\u4e0a\u7ee7\u7eed\u6539\u8fdb\uff0c\u4f2a\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n \u4f46\u662f\u8fd9\u79cd\u7684\u8bdd\u6709\u4e00\u4e2a\u5f0a\u7aef\uff0c\u90a3\u5c31\u662f\u83b7\u53d6\u5206\u5e03\u5f0f\u9501\u7684\u8bf7\u6c42\uff0c\u90fd\u4f1a\u6267\u884c\u4e00\u904d\u67e5\u8be2\u6570\u636e\u5e93<\/strong>\uff0c\u5e76\u66f4\u65b0\u5230\u7f13\u5b58\u3002\u7406\u8bba\u4e0a\u53ea\u6709\u7b2c\u4e00\u4e2a\u52a0\u8f7d\u6570\u636e\u5e93\u8bb0\u5f55\u8bf7\u6c42\u662f\u6709\u6548\u7684<\/strong>\u3002<\/p>\n\n\n\n \u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u901a\u8fc7\u53cc\u91cd\u5224\u5b9a\u9501\u7684\u5f62\u5f0f\uff0c\u5728\u83b7\u53d6\u5230\u5206\u5e03\u5f0f\u9501\u4e4b\u540e\uff0c\u518d\u6b21\u67e5\u8be2\u4e00\u6b21\u7f13\u5b58\u662f\u5426\u5b58\u5728<\/strong>\u3002\u5982\u679c\u7f13\u5b58\u4e2d\u5b58\u5728\u6570\u636e\uff0c\u5c31\u76f4\u63a5\u8fd4\u56de\uff1b\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u624d\u7ee7\u7eed\u6267\u884c\u67e5\u8be2\u6570\u636e\u5e93\u7684\u64cd\u4f5c\u3002\u8fd9\u6837\u5c31\u53ef\u4ee5\u907f\u514d\u5927\u91cf\u8bf7\u6c42\u8bbf\u95ee\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n \u4f2a\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n \u4e0b\u9762\u662f\u8fd9\u79cd\u573a\u666f\u4e0b\u89e3\u51b3\u65b9\u6848\u7684\u4e00\u822c\u6b65\u9aa4\uff1a<\/p>\n\n\n\n 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\u8fd8\u6709\u4e00\u79cd\u6bd4\u8f83\u4f18\u96c5\u7684\u89e3\u51b3\u65b9\u6848\u662f\u901a\u8fc7\u5206\u5e03\u5f0f\u9501\u5206\u7247\u7684\u5f62\u5f0f\uff0c\u8ba9\u5e76\u884c\u7684\u7ebf\u7a0b\u66f4\u591a\u4e00\u4e9b\u3002\u56e0\u4e3a\u540c\u4e00\u65f6\u95f4\u6709\u591a\u4e2a\u7ebf\u7a0b\u80fd\u540c\u65f6\u64cd\u4f5c\uff0c\u6240\u4ee5\u7406\u8bba\u4e0a\uff0c\u8bbe\u7f6e\u5206\u7247\u91cf\u7684\u591a\u5c11\uff0c\u4e5f\u5c31\u662f\u6027\u80fd\u63d0\u5347\u4e86\u8fd1\u591a\u5c11\u500d\u3002<\/p>\n\n\n\n \u4f2a\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n \u7b2c\u4e00\u7248\u672c\u7684\u4ee3\u7801\u662f\u6700\u4e3a\u539f\u59cb\u7684\u76f4\u63a5\u67e5\u8be2\u6570\u636e\u5e93\uff0c\u6570\u636e\u91cf\u5927\u7684\u65f6\u5019\uff0c\u80af\u5b9a\u662f\u6ca1\u529e\u6cd5\u625b\u4f4f\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u63a5\u4e0b\u6765\u5f15\u5165\u89e3\u51b3\u4e86\u7f13\u5b58\u51fb\u7a7f\u7684\u7248\u672c\u3002<\/p>\n\n\n\n \u6211\u4eec\u7701\u53bb\u4e86\u7b80\u5355\u7684\u5206\u5e03\u5f0f\u8fc7\u7a0b\uff0c\u4e0a\u9762\u5df2\u7ecf\u6709\u7b80\u5355\u7684\u793a\u4f8b\uff0c\u76f4\u63a5\u7528\u8f83\u5e38\u89c1\u7684\u53cc\u91cd\u5224\u5b9a\u9501\u3002<\/p>\n\n\n\n @Override }<\/p>\n\n\n\n \u770b\u4e86\u4e0a\u9762\u7f13\u5b58\u51fb\u7a7f\u7406\u8bba\u77e5\u8bc6\u540e\uff0c\u8fd9\u4e2a\u4ee3\u7801\u5c31\u6bd4\u8f83\u5bb9\u6613\u7406\u89e3\u3002\u5176\u4e2d\u56e0\u4e3a\u6211\u4eec\u8981\u8fdb\u884c\u51c6\u6362 Hash putAll \u65b9\u6cd5\u6240\u4ee5\u9700\u8981\u8fdb\u884c\u591a\u6b21 Map \u8f6c\u6362\uff0c\u8fd9\u4e2a\u5c5e\u4e8e\u662f\u4e1a\u52a1\u590d\u6742\u6027\u5bfc\u81f4\uff0c\u5982\u679c\u53ea\u662f\u7b80\u5355\u653e\u4e2a String \u4ee3\u7801\u6d41\u7a0b\u4f1a\u7b80\u5355\u5f88\u591a\u3002<\/p>\n\n\n\n \u4f18\u60e0\u5238\u6a21\u677f\u7f13\u5b58\u51fb\u7a7f\u67e5\u8be2\u65f6\u5e8f\u56fe\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n \u867d\u7136\u6211\u4eec\u8bb2\u4e86\u591a\u79cd\u7f13\u5b58\u51fb\u7a7f\u7684\u65b9\u6848\uff0c\u5176\u4e2d\u8bf4\u5230\u7684 tryLock \u548c\u5206\u5e03\u5f0f\u9501\u5206\u7247\u4e00\u822c\u53ea\u4f1a\u51fa\u73b0\u5728\u9762\u8bd5\u4e2d\uff0c\u56e0\u4e3a\u56fd\u5185 99.99% \u7684\u516c\u53f8\u4e0d\u5b58\u5728\u5b58\u5728\u9ad8\u5e76\u53d1\u6781\u7aef\u7684\u60c5\u51b5\uff0c\u5199\u4e2a\u53cc\u91cd\u5224\u5b9a\u9501\u5df2\u7ecf\u662f\u5bf9\u4e1a\u52a1\u7684\u5c0a\u91cd\u4e86\u3002\u53ef\u4ee5\u80cc\u516b\u80a1\uff0c\u4f46\u522b\u88ab\u516b\u80a1\u5e26\u8fdb\u53bb\u3002<\/p>\n\n\n\n \u4f18\u60e0\u5238\u6a21\u677f\u6709\u6709\u6548\u671f\u5f00\u59cb\u65f6\u95f4\u3001\u7ed3\u675f\u65f6\u95f4\u4e24\u4e2a\u5b57\u6bb5\uff0c\u6240\u4ee5\u628a\u7f13\u5b58\u7684\u8fc7\u671f\u65f6\u95f4\u8bbe\u7f6e\u6210\u548c\u4f18\u60e0\u5238\u6a21\u677f\u6709\u6548\u671f\u7684\u7ed3\u675f\u65f6\u95f4\u4e00\u81f4\uff0c\u67e5\u4e0d\u5230\u7f13\u5b58\u5c31\u76f4\u63a5\u63d0\u793a\u7528\u6237\u4f18\u60e0\u5238\u6a21\u677f\u5df2\u7ecf\u5931\u6548\uff0c\u662f\u4e0d\u662f\u5c31\u80fd\u4e0d\u7528\u8003\u8651\u7f13\u5b58\u51fb\u7a7f\u95ee\u9898\u4e86<\/strong><\/p>\n\n\n\n \u6211\u60f3\u53ef\u80fd\u6709\u4e9b\u573a\u666f\u4e0b\u67d0\u4e2a\u4f18\u60e0\u5238\u53ea\u80fd\u5728\u6709\u6548\u671f\u65f6\u95f4\u5185\u7684\u6307\u5b9a\u65f6\u95f4\u4f7f\u7528\uff0c\u6240\u4ee5\u8003\u8651\u5230\u8fd9\u70b9\u5c31\u6ca1\u7528\u4f60\u8bf4\u7684\u65b9\u6cd5\uff1f<\/strong><\/p>\n\n\n\n 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\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u7ed3\u5408\u4f7f\u7528\u3002\u4ec5\u4ec5\u4f9d\u9760\u7f13\u5b58\u9884\u70ed\u548c\u8bbe\u7f6e\u6570\u636e\u6c38\u4e0d\u8fc7\u671f\u5e76\u4e0d\u662f\u4e00\u4e2a\u5168\u9762\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u8fd8\u9700\u8981\u8003\u8651\u5408\u9002\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u6765\u4fdd\u969c\u7f13\u5b58\u51fb\u7a7f\u65b9\u6848\u6709\u6548\u6267\u884c\u3002<\/p>\n\n\n\n \u5185\u5b58\u603b\u662f\u6709\u9650\u7684\uff0c\u56e0\u6b64\u5f53 Redis \u5185\u5b58\u8d85\u51fa\u6700\u5927\u5185\u5b58\u65f6\uff0c\u5c31\u9700\u8981\u6839\u636e\u4e00\u5b9a\u7684\u7b56\u7565\u53bb\u4e3b\u52a8\u7684\u6dd8\u6c70\u4e00\u4e9b Key\uff0c\u6765\u817e\u51fa\u5185\u5b58\uff0c\u8fd9\u5c31\u662f\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u914d\u7f6e\u6587\u4ef6\u4e2d\u901a\u8fc7 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\u4ece\u6dd8\u6c70\u8303\u56f4\u6765\u8bf4\u53ef\u4ee5\u5206\u4e3a\u4e0d\u6dd8\u6c70\u4efb\u4f55\u6570\u636e\u3001\u53ea\u4ece\u8bbe\u7f6e\u4e86\u5230\u671f\u65f6\u95f4\u7684\u952e\u4e2d\u6dd8\u6c70\u548c\u4ece\u6240\u6709\u952e\u4e2d\u6dd8\u6c70\u4e09\u7c7b\u3002\u800c\u4ece\u6dd8\u6c70\u7b97\u6cd5\u6765\u5206\uff0c\u53c8\u4e3b\u8981\u5206\u4e3a Random\uff08\u968f\u673a\uff09\uff0cLRU\uff08\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\uff09\uff0c\u4ee5\u53ca LFU\uff08\u6700\u8fd1\u6700\u4e0d\u5e38\u4f7f\u7528\uff09\u4e09\u79cd\u3002<\/p>\n\n\n\n \u5176\u4e2d\uff0c\u5173\u4e8e LRU \u7b97\u6cd5\uff0c\u5b83\u662f\u4e00\u79cd\u975e\u5e38\u5e38\u89c1\u7684\u7f13\u5b58\u6dd8\u6c70\u7b97\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u7406\u89e3\u4e3a Redis \u4f1a\u5728\u6bcf\u6b21\u8bbf\u95ee Key \u7684\u65f6\u5019\u8bb0\u5f55\u8bbf\u95ee\u65f6\u95f4\uff0c\u5f53\u6dd8\u6c70\u65f6\uff0c\u4f18\u5148\u6dd8\u6c70\u6700\u540e\u4e00\u6b21\u8bbf\u95ee\u8ddd\u79bb\u73b0\u5728\u6700\u65e9\u7684 Key\u3002<\/p>\n\n\n\n \u800c\u5bf9\u4e8e LFU \u7b97\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u4e3a Redis \u4f1a\u5728\u8bbf\u95ee Key \u65f6\uff0c\u6839\u636e\u4e24\u6b21\u8bbf\u95ee\u65f6\u95f4\u7684\u95f4\u9694\u8ba1\u7b97\u5e76\u7d2f\u52a0\u8bbf\u95ee\u9891\u7387\u6307\u6807\uff0c\u5f53\u6dd8\u6c70\u65f6\uff0c\u4f18\u5148\u6dd8\u6c70\u8bbf\u95ee\u9891\u7387\u6307\u6807\u6700\u4f4e\u7684 key\u3002\u76f8\u6bd4 LRU \u7b97\u6cd5\uff0c\u5b83\u907f\u514d\u4e86\u4f4e\u9891\u7387\u7684\u5927\u6279\u91cf\u67e5\u8be2\u9020\u6210\u7684\u7f13\u5b58\u6c61\u67d3\u95ee\u9898\u3002<\/p>\n\n\n\n LRU \u6709\u4e2a\u6700\u5927\u95ee\u9898\uff0c\u5c31\u662f\u5b83\u53ea\u8ba4\u6700\u8fd1\u4e00\u6b21\u8bbf\u95ee\u65f6\u95f4\u3002\u800c\u5982\u679c\u51fa\u73b0\u7cfb\u7edf\u5076\u5c14\u9700\u8981\u4e00\u6b21\u6027\u8bfb\u53d6\u5927\u91cf\u6570\u636e\u7684\u65f6\u5019\uff0c\u4f1a\u5927\u89c4\u6a21\u66f4\u65b0 Key \u7684\u6700\u8fd1\u8bbf\u95ee\u65f6\u95f4\uff0c\u4ece\u800c\u5bfc\u81f4\u771f\u6b63\u9700\u8981\u88ab\u9891\u7e41\u8bbf\u95ee\u7684 Key \u56e0\u4e3a\u6700\u8fd1\u4e00\u6b21\u8bbf\u95ee\u65f6\u95f4\u66f4\u65e9\u800c\u88ab\u76f4\u63a5\u6dd8\u6c70\u3002\u8fd9\u79cd\u60c5\u51b5\u88ab\u79f0\u4e3a\u7f13\u5b58\u6c61\u67d3\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528 LFU \u7b97\u6cd5\u6765\u89e3\u51b3\u3002<\/p>\n\n\n\n \u4e3e\u4e2a\u4f8b\u5b50\uff0c\u6211\u4eec\u64cd\u4f5c\u4e86\u7f13\u5b58\u9884\u70ed\u548c\u8bbe\u7f6e Redis \u6c38\u4e0d\u8fc7\u671f\uff0c\u5982\u679c\u8bf4\u8bbe\u7f6e Redis \u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u662f\u4ee5\u4e0b\u7c7b\u578b\uff1a<\/p>\n\n\n\n \u56e0\u4e3a\u662f\u4ece\u6240\u6709\u952e\u4e2d\u53bb\u6267\u884c\u6dd8\u6c70\u7b97\u6cd5\uff0c\u662f\u5426\u6709\u53ef\u80fd\u5c06\u54b1\u4eec\u8bbe\u7f6e\u7684\u70ed Key \u6216\u8005\u8bf4\u8bbf\u95ee\u8f83\u591a\u7684 Key \u7ed9\u6dd8\u6c70\u6389\uff1f\u7b2c\u4e00\u79cd\u7edd\u5bf9\u6709\u53ef\u80fd\uff0c\u7b2c\u4e8c\u4e09\u79cd\u867d\u7136\u6982\u7387\u6bd4\u8f83\u5c0f\uff0c\u4f46\u662f\u4e5f\u4e0d\u662f\u6ca1\u53ef\u80fd\u3002<\/p>\n\n\n\n \u6240\u4ee5\uff0c\u6211\u4eec\u53ea\u80fd\u4ece\u8fd9\u51e0\u4e2a\u6dd8\u6c70\u7b97\u6cd5\u4e2d\u8fdb\u884c\u9009\u62e9\uff1a<\/p>\n\n\n\n \u4ece\u5e38\u89c4\u4e0a\u6765\u8bf4\uff0c\u5982\u679c\u5927\u5bb6\u516c\u53f8 Redis \u6bd4\u8f83\u8c6a\uff0c\u4e5f\u5c31\u662f\u4e1a\u52a1\u6323\u94b1\uff0c\u5728\u8d44\u6e90\u4e0a\u4e0d\u541d\u556c\uff0c\u5fc5\u7136\u6beb\u4e0d\u72b9\u8c6b\u9009\u62e9 \u7b80\u5355\u7684\u6765\u8bf4\uff0c\u5982\u679c\u4f60\u7684\u4e1a\u52a1\u6570\u636e\u7684\u8bbf\u95ee\u6bd4\u8f83\u5e73\u5747\uff0c\u4e0d\u5b58\u5728\u660e\u663e\u7684\u51b7\u70ed\u533a\u522b\uff0c\u90a3\u4e48 LRU \u53ef\u4ee5\u6ee1\u8db3\u4e00\u822c\u7684\u4f7f\u7528\u9700\u6c42\u3002\u5982\u679c\u4f60\u7684\u4e1a\u52a1\u5177\u5907\u5f88\u5f3a\u7684\u65f6\u6548\u6027\uff0c\u800c\u4e14\u662f\u5b58\u5728\u5927\u4fc3\u5546\u54c1\u8fd9\u79cd\u660e\u663e\u7684\u70ed\u70b9\u6570\u636e\uff0c\u90a3\u4e48\u63a8\u8350\u4f60\u4f7f\u7528 LFU\u3002<\/p>\n\n\n\n \u56e0\u4e3a\u725b\u5238\u91cc\u7684\u4e00\u4e9b\u6a21\u677f\u4e5f\u4e0d\u5168\u662f\u5e38\u7528\u7684\uff0c\u9002\u5f53\u5185\u5b58\u5403\u7d27\u7684\u65f6\u5019\u53ef\u4ee5\u6dd8\u6c70\u4e00\u90e8\u5206\u5e26\u8fc7\u671f\u65f6\u95f4\u7684 Key\uff0c\u518d\u52a0\u4e0a\u725b\u5238\u4e2d\u7684\u4f18\u60e0\u5238\u5b58\u5728\u660e\u663e\u7684\u51b7\u70ed\u6570\u636e\u73b0\u8c61\uff0c\u6211\u5efa\u8bae\u4f7f\u7528 \u4ee5\u4e0b\u5185\u5bb9\u4e86\u89e3\u5373\u53ef\uff0c\u5982\u4e0d\u5bb9\u6613\u7406\u89e3\uff0c\u53ef\u8df3\u8fc7\u77e5\u9053\u5982\u4f55\u5e94\u7528\u5373\u53ef\u3002<\/p>\n\n\n\n Redis \u5185\u5b58\u6dd8\u6c70\u6267\u884c\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n\n\n\n \u5728\u62bd\u6837\u8fd9\u4e00\u6b65\uff0c\u6d89\u53ca\u5230\u4ece\u5b57\u5178\u4e2d\u968f\u673a\u62bd\u6837\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u7531\u4e8e\u54c8\u5e0c\u8868\u7684 Key \u662f\u6563\u5217\u5206\u5e03\u7684\uff0c\u56e0\u6b64\u4f1a\u6709\u5f88\u591a\u6876\u90fd\u662f\u7a7a\u7684\uff0c\u7eaf\u968f\u673a\u6548\u7387\u53ef\u80fd\u4f1a\u5f88\u4f4e\u3002\u56e0\u6b64\uff0cRedis \u91c7\u7528\u4e86\u4e00\u4e2a\u7279\u522b\u7684\u505a\u6cd5\uff0c\u90a3\u5c31\u662f\u5148\u8fde\u7eed\u904d\u5386\u6570\u4e2a\u6876\uff0c\u5982\u679c\u90fd\u662f\u7a7a\u7684\uff0c\u518d\u968f\u673a\u8c03\u5230\u53e6\u4e00\u4e2a\u4f4d\u7f6e\uff0c\u518d\u8fde\u7eed\u904d\u5386\u51e0\u4e2a\u6876\u2026\u2026\u5982\u6b64\u5faa\u73af\uff0c\u76f4\u5230\u7ed3\u675f\u62bd\u6837\u3002<\/p>\n\n\n\n \u4f60\u53ef\u4ee5\u53c2\u7167\u6e90\u7801\u7406\u89e3\u8fd9\u4e2a\u8fc7\u7a0b\uff1a<\/p>\n\n\n\n LRU \u7684\u5168\u79f0\u4e3a \u5b83\u662f\u4e00\u79cd\u975e\u5e38\u5e38\u89c1\u7684\u7f13\u5b58\u56de\u6536\u7b97\u6cd5\uff0c\u5728\u8bf8\u5982 \u4f20\u7edf\u7684 LRU \u7b97\u6cd5\u5b9e\u73b0\u901a\u5e38\u4f1a\u7ef4\u62a4\u4e00\u4e2a\u94fe\u8868\uff0c\u5f53\u8bbf\u95ee\u8fc7\u67d0\u4e2a\u8282\u70b9\u540e\u5c31\u5c06\u8be5\u8282\u70b9\u79fb\u81f3\u94fe\u8868\u5934\u90e8\u3002\u5982\u6b64\u53cd\u590d\u540e\uff0c\u94fe\u8868\u7684\u8282\u70b9\u5c31\u4f1a\u6309\u6700\u8fd1\u4e00\u6b21\u8bbf\u95ee\u65f6\u95f4\u6392\u5e8f\u3002\u5f53\u7f13\u5b58\u6570\u91cf\u5230\u8fbe\u4e0a\u9650\u540e\uff0c\u6211\u4eec\u76f4\u63a5\u79fb\u9664\u5c3e\u8282\u70b9\uff0c\u5373\u53ef\u79fb\u9664\u6700\u8fd1\u6700\u5c11\u8bbf\u95ee\u7684\u7f13\u5b58\u3002<\/p>\n\n\n\n \u4e0d\u8fc7\uff0c\u5bf9\u4e8e Redis \u6765\u8bf4\uff0c\u5982\u679c\u6bcf\u4e2a Key \u6dfb\u52a0\u7684\u65f6\u5019\u90fd\u9700\u8981\u989d\u5916\u7684\u7ef4\u62a4\u5e76\u64cd\u4f5c\u8fd9\u6837\u4e00\u6761\u94fe\u8868\uff0c\u8981\u989d\u5916\u4ed8\u51fa\u7684\u4ee3\u4ef7\u663e\u7136\u662f\u4e0d\u53ef\u63a5\u53d7\u7684\uff0c\u56e0\u6b64 Redis \u4e2d\u7684 LRU \u662f\u8fd1\u4f3c LRU\uff08 \u5f53\u6bcf\u6b21\u8bbf\u95ee Key \u65f6\uff0cRedis \u4f1a\u5728\u7ed3\u6784\u4f53\u4e2d\u8bb0\u5f55\u672c\u6b21\u8bbf\u95ee\u65f6\u95f4\uff0c\u800c\u5f53\u9700\u8981\u6dd8\u6c70 Key \u65f6\uff0c\u5c06\u4f1a\u4ece\u5168\u90e8\u6570\u636e\u4e2d\u8fdb\u884c\u62bd\u6837\uff0c\u7136\u540e\u518d\u79fb\u9664\u6837\u672c\u4e2d\u4e0a\u6b21\u8bbf\u95ee\u65f6\u95f4\u6700\u65e9\u7684 key\u3002<\/p>\n\n\n\n \u5b83\u7684\u7279\u70b9\u662f\uff1a<\/p>\n\n\n\n![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/89f3970c0522a1bf42b474d803197096.png\")
<\/p>\n\n\n\npublic String selectTrain(String id) { String cacheData = cache.get(id); \/\/ \u67e5\u8be2\u7f13\u5b58\u4e0d\u5b58\u5728\uff0c\u53bb\u6570\u636e\u5e93\u67e5\u8be2\u5e76\u653e\u5165\u5230\u7f13\u5b58 if (StrUtil.isBlank(cacheData)) { \/\/ \u83b7\u53d6\u6570\u636e\u5e93\u4e2d\u5b58\u5728\u7684\u6570\u636e String dbData = trainMapper.selectId(id); if (StrUtil.isNotBlank(dbData)) { \/\/ \u5c06\u67e5\u8be2\u5230\u7684\u6570\u636e\u653e\u5165\u7f13\u5b58\uff0c\u4e0b\u6b21\u67e5\u8be2\u5c31\u6709\u6570\u636e\u4e86 cahce.set(id, dbData); cacheData = dbData; } } return cacheData; }<\/code><\/p>\n\n\n\n\u7f13\u5b58\u51fb\u7a7f\u89e3\u51b3\u65b9\u6848<\/h2>\n\n\n\n
1. \u9884\u70ed\u548c\u7f13\u5b58\u6c38\u4e0d\u8fc7\u671f<\/h3>\n\n\n\n
\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/2699357f6a49c8cede8f4a6f5d46dee1.png\")
<\/p>\n\n\n\n2. \u5206\u5e03\u5f0f\u9501\u4e4b\u53cc\u91cd\u5224\u5b9a\u9501<\/h3>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/f447a2ad18495763f92decc75f39d9cd.png\")
<\/p>\n\n\n\npublic String selectTrain(String id) {\n String cacheData = cache.get(id); \/\/ \u67e5\u8be2\u7f13\u5b58\n if (StrUtil.isBlank(cacheData)) { \/\/ \u7f13\u5b58\u4e0d\u5b58\u5728\uff0c\u53bb\u6570\u636e\u5e93\u67e5\u8be2\u5e76\u653e\u5165\u7f13\u5b58\n Lock lock = getLock(id); \/\/ \u83b7\u53d6\u5206\u5e03\u5f0f\u9501\n lock.lock();\n try {\n String dbData = trainMapper.selectId(id); \/\/ \u67e5\u8be2\u6570\u636e\u5e93\n if (StrUtil.isNotBlank(dbData)) { \/\/ \u6570\u636e\u5e93\u4e2d\u6709\u6570\u636e\n cache.set(id, dbData); \/\/ \u5c06\u6570\u636e\u653e\u5165\u7f13\u5b58\n cacheData = dbData;\n }\n } finally {\n lock.unlock(); \/\/ \u91ca\u653e\u9501\n }\n }\n return cacheData;\n}<\/code><\/pre>\n\n\n\n![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/76faba6e64e865ead6c6b475291dd22c.png\")
<\/p>\n\n\n\npublic String selectTrain(String id) {\n \/\/ \u67e5\u8be2\u7f13\u5b58\n String cacheData = cache.get(id);\n \/\/ \u67e5\u8be2\u7f13\u5b58\u4e0d\u5b58\u5728\uff0c\u53bb\u6570\u636e\u5e93\u67e5\u8be2\u5e76\u653e\u5165\u5230\u7f13\u5b58\n if (StrUtil.isBlank(cacheData)) {\n \/\/ \u4e3a\u907f\u514d\u5927\u91cf\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u901a\u8fc7\u5206\u5e03\u5f0f\u9501\u51cf\u5c11\u6570\u636e\u5e93\u8bbf\u95ee\u91cf\n Lock lock = getLock(id);\n lock.lock();\n try {\n \/\/ \u83b7\u53d6\u9501\u540e\u53cc\u91cd\u5224\u5b9a\n cacheData = cache.get(id);\n \/\/ \u7406\u8bba\u4e0a\u53ea\u6709\u7b2c\u4e00\u4e2a\u8bf7\u6c42\u52a0\u8f7d\u6570\u636e\u5e93\u662f\u6709\u6548\u7684\uff0c\u56e0\u4e3a\u5b83\u52a0\u8f7d\u540e\u4f1a\u628a\u6570\u636e\u653e\u5230\u7f13\u5b58\n \/\/ \u540e\u9762\u7684\u8bf7\u6c42\u518d\u8bf7\u6c42\u6570\u636e\u5e93\u52a0\u8f7d\u7f13\u5b58\u5c31\u6ca1\u6709\u5fc5\u8981\u4e86\n if (StrUtil.isBlank(cacheData)) {\n \/\/ \u83b7\u53d6\u6570\u636e\u5e93\u4e2d\u5b58\u5728\u7684\u6570\u636e\n String dbData = trainMapper.selectId(id);\n if (StrUtil.isNotBlank(dbData)) {\n \/\/ \u5c06\u67e5\u8be2\u5230\u7684\u6570\u636e\u653e\u5165\u7f13\u5b58\uff0c\u4e0b\u6b21\u67e5\u8be2\u5c31\u6709\u6570\u636e\u4e86\n cache.set(id, dbData);\n cacheData = dbData;\n }\n }\n } finally {\n lock.unlock();\n }\n }\n return cacheData;\n}<\/code><\/pre>\n\n\n\n\n
3. \u9ad8\u5e76\u53d1\u6781\u7aef\u60c5\u51b5<\/h3>\n\n\n\n
\n
3.1 \u5c1d\u8bd5\u83b7\u53d6\u9501 tryLock<\/h4>\n\n\n\n
tryLock<\/code> API\uff0c\u5b83\u7684\u8bed\u4e49\u662f\u5982\u679c\u62ff\u9501\u5931\u8d25\u76f4\u63a5\u8fd4\u56de\uff0c\u800c\u4e0d\u662f\u963b\u585e\u7b49\u5f85\u76f4\u5230\u83b7\u53d6\u9501\u3002<\/p>\n\n\n\npublic String selectTrain(String id) {\n \/\/ \u67e5\u8be2\u7f13\u5b58\u4e0d\u5b58\u5728\uff0c\u53bb\u6570\u636e\u5e93\u67e5\u8be2\u5e76\u653e\u5165\u5230\u7f13\u5b58\n String cacheData = cache.get(id);\n if (StrUtil.isBlank(cacheData)) {\n \/\/ \u4e3a\u907f\u514d\u5927\u91cf\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u901a\u8fc7\u5206\u5e03\u5f0f\u9501\u51cf\u5c11\u6570\u636e\u5e93\u8bbf\u95ee\u91cf\n Lock lock = getLock(id);\n \/\/ \u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u83b7\u53d6\u5931\u8d25\u76f4\u63a5\u8fd4\u56de\u7528\u6237\u8bf7\u6c42\uff0c\u5e76\u63d0\u9192\u7528\u6237\u7a0d\u540e\u518d\u8bd5\n if (!lock.tryLock()) {\n throw new RuntimeException(\"\u5f53\u524d\u8bbf\u95ee\u4eba\u6570\u8fc7\u591a\uff0c\u8bf7\u7a0d\u5019\u518d\u8bd5...\");\n }\n try {\n \/\/ \u83b7\u53d6\u6570\u636e\u5e93\u4e2d\u5b58\u5728\u7684\u6570\u636e\n String dbData = trainMapper.selectId(id);\n if (StrUtil.isNotBlank(dbData)) {\n \/\/ \u5c06\u67e5\u8be2\u5230\u7684\u6570\u636e\u653e\u5165\u7f13\u5b58\uff0c\u4e0b\u6b21\u67e5\u8be2\u5c31\u6709\u6570\u636e\u4e86\n cache.set(id, dbData);\n cacheData = dbData;\n }\n } finally {\n lock.unlock();\n }\n }\n return cacheData;\n}<\/code><\/pre>\n\n\n\n3.2 \u5206\u5e03\u5f0f\u9501\u5206\u7247<\/h4>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/32996d60607760a4089e5b610afb3d59.png\")
<\/p>\n\n\n\npublic String selectTrain(String id, String userId) {\n \/\/ \u67e5\u8be2\u7f13\u5b58\u4e0d\u5b58\u5728\uff0c\u53bb\u6570\u636e\u5e93\u67e5\u8be2\u5e76\u653e\u5165\u5230\u7f13\u5b58\n String cacheData = cache.get(id);\n if (StrUtil.isBlank(cacheData)) {\n \/\/ \u5047\u8bbe\u8bbe\u7f6e10\u628a\u5206\u5e03\u5f0f\u9501\uff0c\u90a3\u4e48\u5c31\u901a\u8fc7\u552f\u4e00\u6807\u8bc6\uff08\u8fd9\u91cc\u53d6\u7528\u6237ID\uff09\u8fdb\u884c\u53d6\u6a21\u83b7\u53d6\u5206\u7247\u4e0b\u6807\n int idx = Math.abs(userId.hashCode()) % 10;\n \/\/ \u4e3a\u907f\u514d\u5927\u91cf\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u901a\u8fc7\u5206\u5e03\u5f0f\u9501\u51cf\u5c11\u6570\u636e\u5e93\u8bbf\u95ee\u91cf\n Lock lock = getLock(id + idx);\n lock.lock();\n try {\n \/\/ \u83b7\u53d6\u9501\u540e\u53cc\u91cd\u5224\u5b9a\n cacheData = cache.get(id);\n \/\/ \u7406\u8bba\u4e0a\u53ea\u6709\u7b2c\u4e00\u4e2a\u8bf7\u6c42\u52a0\u8f7d\u6570\u636e\u5e93\u662f\u6709\u6548\u7684\uff0c\u56e0\u4e3a\u5b83\u52a0\u8f7d\u540e\u4f1a\u628a\u6570\u636e\u653e\u5230\u7f13\u5b58\n \/\/ \u540e\u9762\u7684\u8bf7\u6c42\u518d\u8bf7\u6c42\u6570\u636e\u5e93\u52a0\u8f7d\u7f13\u5b58\u5c31\u6ca1\u6709\u5fc5\u8981\u4e86\n if (StrUtil.isBlank(cacheData)) {\n \/\/ \u83b7\u53d6\u6570\u636e\u5e93\u4e2d\u5b58\u5728\u7684\u6570\u636e\n String dbData = trainMapper.selectId(id);\n if (StrUtil.isNotBlank(dbData)) {\n \/\/ \u5c06\u67e5\u8be2\u5230\u7684\u6570\u636e\u653e\u5165\u7f13\u5b58\uff0c\u4e0b\u6b21\u67e5\u8be2\u5c31\u6709\u6570\u636e\u4e86\n cache.set(id, dbData);\n cacheData = dbData;\n }\n }\n } finally {\n lock.unlock();\n }\n }\n return cacheData;\n}<\/code><\/pre>\n\n\n\n\u5f00\u53d1\u4f18\u60e0\u5238\u6a21\u677f\u67e5\u8be2<\/h2>\n\n\n\n
1. \u5e38\u89c4\u4f18\u60e0\u5238\u6a21\u677f\u67e5\u8be2<\/h3>\n\n\n\n
package com.nageoffer.onecoupon.engine.service.impl;\n\nimport cn.hutool.core.bean.BeanUtil;\nimport com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;\nimport com.baomidou.mybatisplus.core.toolkit.Wrappers;\nimport com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;\nimport com.nageoffer.onecoupon.engine.common.enums.CouponTemplateStatusEnum;\nimport com.nageoffer.onecoupon.engine.dao.entity.CouponTemplateDO;\nimport com.nageoffer.onecoupon.engine.dao.mapper.CouponTemplateMapper;\nimport com.nageoffer.onecoupon.engine.dto.req.CouponTemplateQueryReqDTO;\nimport com.nageoffer.onecoupon.engine.dto.resp.CouponTemplateQueryRespDTO;\nimport com.nageoffer.onecoupon.engine.service.CouponTemplateService;\nimport lombok.RequiredArgsConstructor;\nimport lombok.extern.slf4j.Slf4j;\nimport org.springframework.stereotype.Service;\n\n\/**\n * \u4f18\u60e0\u5238\u6a21\u677f\u4e1a\u52a1\u903b\u8f91\u5b9e\u73b0\u5c42\n * <p>\n * \u4f5c\u8005\uff1a\u9a6c\u4e01\n * \u52a0\u9879\u76ee\u7fa4\uff1a\u65e9\u52a0\u5165\u5c31\u662f\u4f18\u52bf\uff01500\u4eba\u5185\u90e8\u9879\u76ee\u7fa4\uff0c\u5206\u4eab\u7684\u77e5\u8bc6\u603b\u6709\u4f60\u9700\u8981\u7684 <a href=\"https:\/\/t.zsxq.com\/cw7b9 \" \/>\n * \u5f00\u53d1\u65f6\u95f4\uff1a2024-07-08\n *\/\n@Slf4j\n@Service\n@RequiredArgsConstructor\npublic class CouponTemplateServiceImpl extends ServiceImpl<CouponTemplateMapper, CouponTemplateDO> implements CouponTemplateService {\n\n private final CouponTemplateMapper couponTemplateMapper;\n\n @Override\n public CouponTemplateQueryRespDTO findCouponTemplate(CouponTemplateQueryReqDTO requestParam) {\n LambdaQueryWrapper<CouponTemplateDO> queryWrapper = Wrappers.lambdaQuery(CouponTemplateDO.class)\n .eq(CouponTemplateDO::getShopNumber, Long.parseLong(requestParam.getShopNumber()))\n .eq(CouponTemplateDO::getId, Long.parseLong(requestParam.getCouponTemplateId()))\n .eq(CouponTemplateDO::getStatus, CouponTemplateStatusEnum.ACTIVE.getStatus());\n CouponTemplateDO couponTemplateDO = couponTemplateMapper.selectOne(queryWrapper);\n return BeanUtil.toBean(couponTemplateDO, CouponTemplateQueryRespDTO.class);\n }\n}<\/code><\/pre>\n\n\n\n2. \u67e5\u8be2\u4f18\u60e0\u5238\u6a21\u677f\u7f13\u5b58<\/h3>\n\n\n\n
public CouponTemplateQueryRespDTO findCouponTemplate(CouponTemplateQueryReqDTO requestParam) {
\/\/ \u67e5\u8be2 Redis \u7f13\u5b58\u4e2d\u662f\u5426\u5b58\u5728\u4f18\u60e0\u5238\u6a21\u677f\u4fe1\u606f
String couponTemplateCacheKey = String.format(EngineRedisConstant.COUPON_TEMPLATE_KEY, requestParam.getCouponTemplateId());
Map couponTemplateCacheMap = stringRedisTemplate.opsForHash().entries(couponTemplateCacheKey);<\/p>\n\n\n\n\/\/ \u5982\u679c\u5b58\u5728\u76f4\u63a5\u8fd4\u56de\uff0c\u4e0d\u5b58\u5728\u9700\u8981\u901a\u8fc7\u53cc\u91cd\u5224\u5b9a\u9501\u7684\u5f62\u5f0f\u8bfb\u53d6\u6570\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55\nif (MapUtil.isEmpty(couponTemplateCacheMap)) {\n \/\/ \u83b7\u53d6\u4f18\u60e0\u5238\u6a21\u677f\u5206\u5e03\u5f0f\u9501\n \/\/ \u5173\u4e8e\u7f13\u5b58\u51fb\u7a7f\u66f4\u591a\u6ce8\u91ca\u4e8b\u9879\uff0c\u6b22\u8fce\u67e5\u770b\u6211\u7684B\u7ad9\u89c6\u9891\uff1ahttps:\/\/www.bilibili.com\/video\/BV1qz421z7vC\n RLock lock = redissonClient.getLock(String.format(EngineRedisConstant.LOCK_COUPON_TEMPLATE_KEY, requestParam.getCouponTemplateId()));\n lock.lock();\n\n try {\n \/\/ \u901a\u8fc7\u53cc\u91cd\u5224\u5b9a\u9501\u4f18\u5316\u5927\u91cf\u8bf7\u6c42\u65e0\u610f\u4e49\u67e5\u8be2\u6570\u636e\u5e93\n couponTemplateCacheMap = stringRedisTemplate.opsForHash().entries(couponTemplateCacheKey);\n if (MapUtil.isEmpty(couponTemplateCacheMap)) {\n LambdaQueryWrapper<CouponTemplateDO> queryWrapper = Wrappers.lambdaQuery(CouponTemplateDO.class)\n .eq(CouponTemplateDO::getShopNumber, Long.parseLong(requestParam.getShopNumber()))\n .eq(CouponTemplateDO::getId, Long.parseLong(requestParam.getCouponTemplateId()))\n .eq(CouponTemplateDO::getStatus, CouponTemplateStatusEnum.ACTIVE.getStatus());\n CouponTemplateDO couponTemplateDO = couponTemplateMapper.selectOne(queryWrapper);\n\n \/\/ \u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\u6216\u8005\u5df2\u8fc7\u671f\u76f4\u63a5\u629b\u51fa\u5f02\u5e38\n if (couponTemplateDO == null) {\n throw new ClientException(\"\u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\u6216\u5df2\u8fc7\u671f\");\n }\n\n \/\/ \u901a\u8fc7\u5c06\u6570\u636e\u5e93\u7684\u8bb0\u5f55\u5e8f\u5217\u5316\u6210 JSON \u5b57\u7b26\u4e32\u653e\u5165 Redis \u7f13\u5b58\n CouponTemplateQueryRespDTO actualRespDTO = BeanUtil.toBean(couponTemplateDO, CouponTemplateQueryRespDTO.class);\n Map<String, Object> cacheTargetMap = BeanUtil.beanToMap(actualRespDTO, false, true);\n Map<String, String> actualCacheTargetMap = cacheTargetMap.entrySet().stream()\n .collect(Collectors.toMap(\n Map.Entry::getKey,\n entry -> entry.getValue() != null ? entry.getValue().toString() : \"\"\n ));\n\n \/\/ \u901a\u8fc7 LUA \u811a\u672c\u6267\u884c\u8bbe\u7f6e Hash \u6570\u636e\u4ee5\u53ca\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\n String luaScript = \"redis.call('HMSET', KEYS[1], unpack(ARGV, 1, #ARGV - 1)) \" +\n \"redis.call('EXPIREAT', KEYS[1], ARGV[#ARGV])\";\n\n List<String> keys = Collections.singletonList(couponTemplateCacheKey);\n List<String> args = new ArrayList<>(actualCacheTargetMap.size() * 2 + 1);\n actualCacheTargetMap.forEach((key, value) -> {\n args.add(key);\n args.add(value);\n });\n\n \/\/ \u4f18\u60e0\u5238\u6d3b\u52a8\u8fc7\u671f\u65f6\u95f4\u8f6c\u6362\u4e3a\u79d2\u7ea7\u522b\u7684 Unix \u65f6\u95f4\u6233\n args.add(String.valueOf(couponTemplateDO.getValidEndTime().getTime() \/ 1000));\n\n \/\/ \u6267\u884c LUA \u811a\u672c\n stringRedisTemplate.execute(\n new DefaultRedisScript<>(luaScript, Long.class),\n keys,\n args.toArray()\n );\n\n couponTemplateCacheMap = cacheTargetMap.entrySet()\n .stream()\n .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));\n }\n } finally {\n lock.unlock();\n }\n}\n\nreturn BeanUtil.mapToBean(couponTemplateCacheMap, CouponTemplateQueryRespDTO.class, false, CopyOptions.create());<\/code><\/pre>\n\n\n\n![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/b6b9c2a046f4fbf6d59d246fcc61e71a.png\")
\u200b<\/p>\n\n\n\n\u6587\u672b\u603b\u7ed3<\/h2>\n\n\n\n
\n@Slf4j\n@Service\n@RequiredArgsConstructor\npublic class CouponTemplateServiceImpl extends ServiceImpl<CouponTemplateMapper, CouponTemplateDO> implements CouponTemplateService {\n\n private final CouponTemplateMapper couponTemplateMapper;\n private final StringRedisTemplate stringRedisTemplate;\n private final RedissonClient redissonClient;\n\n @Override\n public CouponTemplateQueryRespDTO findCouponTemplate(CouponTemplateQueryReqDTO requestParam) {\n \/\/ \u67e5\u8be2 Redis \u7f13\u5b58\u4e2d\u662f\u5426\u5b58\u5728\u4f18\u60e0\u5238\u6a21\u677f\u4fe1\u606f\n String couponTemplateCacheKey = String.format(EngineRedisConstant.COUPON_TEMPLATE_KEY, requestParam.getCouponTemplateId());\n Map<Object, Object> couponTemplateCacheMap = stringRedisTemplate.opsForHash().entries(couponTemplateCacheKey);\n\n \/\/ \u5982\u679c\u5b58\u5728\u76f4\u63a5\u8fd4\u56de\uff0c\u4e0d\u5b58\u5728\u9700\u8981\u901a\u8fc7\u53cc\u91cd\u5224\u5b9a\u9501\u7684\u5f62\u5f0f\u8bfb\u53d6\u6570\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55\n if (MapUtil.isEmpty(couponTemplateCacheMap)) {\n \/\/ \u83b7\u53d6\u4f18\u60e0\u5238\u6a21\u677f\u5206\u5e03\u5f0f\u9501\n \/\/ \u5173\u4e8e\u7f13\u5b58\u51fb\u7a7f\u66f4\u591a\u6ce8\u91ca\u4e8b\u9879\uff0c\u6b22\u8fce\u67e5\u770b\u6211\u7684B\u7ad9\u89c6\u9891\uff1ahttps:\/\/www.bilibili.com\/video\/BV1qz421z7vC\n RLock lock = redissonClient.getLock(String.format(EngineRedisConstant.LOCK_COUPON_TEMPLATE_KEY, requestParam.getCouponTemplateId()));\n lock.lock();\n\n try {\n \/\/ \u901a\u8fc7\u53cc\u91cd\u5224\u5b9a\u9501\u4f18\u5316\u5927\u91cf\u8bf7\u6c42\u65e0\u610f\u4e49\u67e5\u8be2\u6570\u636e\u5e93\n couponTemplateCacheMap = stringRedisTemplate.opsForHash().entries(couponTemplateCacheKey);\n if (MapUtil.isEmpty(couponTemplateCacheMap)) {\n LambdaQueryWrapper<CouponTemplateDO> queryWrapper = Wrappers.lambdaQuery(CouponTemplateDO.class)\n .eq(CouponTemplateDO::getShopNumber, Long.parseLong(requestParam.getShopNumber()))\n .eq(CouponTemplateDO::getId, Long.parseLong(requestParam.getCouponTemplateId()))\n .eq(CouponTemplateDO::getStatus, CouponTemplateStatusEnum.ACTIVE.getStatus());\n CouponTemplateDO couponTemplateDO = couponTemplateMapper.selectOne(queryWrapper);\n\n \/\/ \u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\u6216\u8005\u5df2\u8fc7\u671f\u76f4\u63a5\u629b\u51fa\u5f02\u5e38\n if (couponTemplateDO == null) {\n throw new ClientException(\"\u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\u6216\u5df2\u8fc7\u671f\");\n }\n\n \/\/ \u901a\u8fc7\u5c06\u6570\u636e\u5e93\u7684\u8bb0\u5f55\u5e8f\u5217\u5316\u6210 JSON \u5b57\u7b26\u4e32\u653e\u5165 Redis \u7f13\u5b58\n CouponTemplateQueryRespDTO actualRespDTO = BeanUtil.toBean(couponTemplateDO, CouponTemplateQueryRespDTO.class);\n Map<String, Object> cacheTargetMap = BeanUtil.beanToMap(actualRespDTO, false, true);\n Map<String, String> actualCacheTargetMap = cacheTargetMap.entrySet().stream()\n .collect(Collectors.toMap(\n Map.Entry::getKey,\n entry -> entry.getValue() != null ? entry.getValue().toString() : \"\"\n ));\n\n \/\/ \u901a\u8fc7 LUA \u811a\u672c\u6267\u884c\u8bbe\u7f6e Hash \u6570\u636e\u4ee5\u53ca\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\n String luaScript = \"redis.call('HMSET', KEYS[1], unpack(ARGV, 1, #ARGV - 1)) \" +\n \"redis.call('EXPIREAT', KEYS[1], ARGV[#ARGV])\";\n\n List<String> keys = Collections.singletonList(couponTemplateCacheKey);\n List<String> args = new ArrayList<>(actualCacheTargetMap.size() * 2 + 1);\n actualCacheTargetMap.forEach((key, value) -> {\n args.add(key);\n args.add(value);\n });\n\n \/\/ \u4f18\u60e0\u5238\u6d3b\u52a8\u8fc7\u671f\u65f6\u95f4\u8f6c\u6362\u4e3a\u79d2\u7ea7\u522b\u7684 Unix \u65f6\u95f4\u6233\n args.add(String.valueOf(couponTemplateDO.getValidEndTime().getTime() \/ 1000));\n\n \/\/ \u6267\u884c LUA \u811a\u672c\n stringRedisTemplate.execute(\n new DefaultRedisScript<>(luaScript, Long.class),\n keys,\n args.toArray()\n );\n couponTemplateCacheMap = cacheTargetMap.entrySet()\n .stream()\n .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));\n }\n } finally {\n lock.unlock();\n }\n }\n\n return BeanUtil.mapToBean(couponTemplateCacheMap, CouponTemplateQueryRespDTO.class, false, CopyOptions.create());\n }\n}\n<\/code><\/pre>\n\n\n\npublic final class EngineRedisConstant {\n\n \/**\n * \u4f18\u60e0\u5238\u6a21\u677f\u7f13\u5b58 Key\n *\/\n public static final String COUPON_TEMPLATE_KEY = \"one-coupon_engine:template:%s\";\n\n \/**\n * \u4f18\u60e0\u5238\u6a21\u677f\u7f13\u5b58\u5206\u5e03\u5f0f\u9501 Key\n *\/\n public static final String LOCK_COUPON_TEMPLATE_KEY = \"one-coupon_engine:lock:template:%s\";\n}\n<\/code><\/pre>\n\n\n\n![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/09\/1758203693-image.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/eve2333.top\/wp-content\/uploads\/2025\/09\/1758203709-\u5c4f\u5e55\u622a\u56fe-2025-09-18-214530.png\")
<\/figure>\n\n\n\n\u7b2c17\u5c0f\u8282\uff1a\u7528\u6237\u67e5\u8be2\u4f18\u60e0\u5238\u4e4b\u7f13\u5b58\u7a7f\u900f<\/h2>\n\n\n\n
\u4e1a\u52a1\u80cc\u666f<\/h2>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/59830d1da733c00890702f5621eb48e5.png\")
<\/p>\n\n\n\nGit \u5206\u652f<\/h2>\n\n\n\n
\u4ec0\u4e48\u662f\u7f13\u5b58\u7a7f\u900f\uff1f<\/h2>\n\n\n\n
public String selectUser(String userId) {\n String cacheData = cache.get(userId);\n if (StrUtil.isBlank(cacheData)) {\n String dbData = userMapper.selectId(userId);\n if (StrUtil.isNotBlank(dbData)) {\n cahce.set(userId, dbData);\n cacheData = dbData;\n } else {\n throw new RuntimeException();\n }\n }\n return cacheData;\n}<\/code><\/pre>\n\n\n\n\u7f13\u5b58\u7a7f\u900f\u5e38\u89c1\u89e3\u51b3\u65b9\u6848<\/h2>\n\n\n\n
1. \u7a7a\u5bf9\u8c61\u7f13\u5b58<\/h3>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/34107453aa6c24412dff698037a51a5d.png\")
<\/p>\n\n\n\npublic String selectUser(String userId) {\n String cacheData = cache.get(userId);\n if (StrUtil.isBlank(cacheData)) {\n \/\/ \u5224\u65ad Key \u662f\u5426\u5305\u542b\u7a7a\u503c\u7f13\u5b58\uff0c\u5b58\u5728\u76f4\u63a5\u8fd4\u56de\uff0c\u4e0d\u5b58\u5728\u7ee7\u7eed\u6d41\u7a0b\n Boolean cacheIsNull = cache.hasKey(\"is-null_\" + userId);\n if (cacheIsNull) {\n throw new RuntimeException();\n }\n String dbData = userMapper.selectId(userId);\n if (StrUtil.isNotBlank(dbData)) {\n cahce.set(userId, dbData);\n cacheData = dbData;\n } else {\n \/\/ \u67e5\u8be2\u6570\u636e\u5e93\u4e2d\u4e0d\u5b58\u5728\u6570\u636e\uff0c\u6dfb\u52a0\u7a7a\u503c\u7f13\u5b58\u5e76\u8fd4\u56de\n cache.set(\"is-null_\" + userId, \u8f83\u77ed\u8fc7\u671f\u65f6\u95f4);\n throw new RuntimeException();\n }\n }\n return cacheData;\n}<\/code><\/pre>\n\n\n\n2. \u5e03\u9686\u8fc7\u6ee4\u5668<\/h3>\n\n\n\n
2.1 \u4ec0\u4e48\u662f\u5e03\u9686\u8fc7\u6ee4\u5668<\/h4>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/6e97a26ac070458a0d07fb5ccf5cb6be.png\")
<\/p>\n\n\n\n\n
2.2 \u5e03\u9686\u8fc7\u6ee4\u5668\u4f18\u7f3a\u70b9<\/h4>\n\n\n\n
2.3 \u5e03\u9686\u8fc7\u6ee4\u5668\u89e3\u51b3\u7f13\u5b58\u7a7f\u900f<\/h4>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/bfb11ac2d74c0918ad0b2687176836f9.png\")
<\/p>\n\n\n\npublic String selectUser(String userId) {\n String cacheData = cache.get(userId);\n if (StrUtil.isBlank(cacheData)) {\n if (!bloomFilter.contains(fullShortUrl)) {\n throw new RuntimeException();\n }\n String dbData = userMapper.selectId(userId);\n if (StrUtil.isNotBlank(dbData)) {\n cahce.set(userId, dbData);\n cacheData = dbData;\n }\n }\n return cacheData;\n}<\/code><\/pre>\n\n\n\n\n
3. \u5e03\u9686\u8fc7\u6ee4\u5668+\u7a7a\u503c\u7f13\u5b58+\u5206\u5e03\u5f0f\u9501<\/h3>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/d8c6667fdf75b3ca118528873007016e.png\")
<\/p>\n\n\n\npublic String selectUser(String userId) {\n String cacheData = cache.get(userId);\n if (StrUtil.isBlank(cacheData)) {\n \/\/ \u5224\u65ad Key \u662f\u5426\u5b58\u5728\u5e03\u9686\u8fc7\u6ee4\u5668\uff0c\u5b58\u5728\u5219\u7ee7\u7eed\u6d41\u7a0b\uff0c\u5426\u5219\u76f4\u63a5\u8fd4\u56de\n if (!bloomFilter.contains(fullShortUrl)) {\n throw new RuntimeException();\n }\n\u200b\n \/\/ \u5224\u65ad Key \u662f\u5426\u5305\u542b\u7a7a\u503c\u7f13\u5b58\uff0c\u5b58\u5728\u76f4\u63a5\u8fd4\u56de\uff0c\u4e0d\u5b58\u5728\u7ee7\u7eed\u6d41\u7a0b\n Boolean cacheIsNull = cache.hasKey(\"is-null_\" + userId);\n if (cacheIsNull) {\n throw new RuntimeException();\n }\n\u200b\n \/\/ \u83b7\u53d6\u5206\u5e03\u5f0f\u9501\n Lock lock = getLock(userId);\n lock.lock();\n\u200b\n try {\n \/\/ \u62ff\u5230\u9501\u4e4b\u540e\u8fdb\u884c\u53cc\u91cd\u5224\u5b9a\uff0c\u5982\u679c\u7f13\u5b58\u5df2\u7ecf\u5b58\u5728\u5219\u76f4\u63a5\u8fd4\u56de\u5373\u53ef\n cacheData = cache.get(userId);\n if (StrUtil.isBlank(cacheData)) {\n String dbData = userMapper.selectId(userId);\n if (StrUtil.isNotBlank(dbData)) {\n cahce.set(userId, dbData);\n cacheData = dbData;\n } else {\n \/\/ \u67e5\u8be2\u6570\u636e\u5e93\u4e2d\u4e0d\u5b58\u5728\u6570\u636e\uff0c\u6dfb\u52a0\u7a7a\u503c\u7f13\u5b58\u5e76\u8fd4\u56de\n cache.set(\"is-null_\" + userId, \u8f83\u77ed\u8fc7\u671f\u65f6\u95f4);\n throw new RuntimeException();\n }\n }\n } finally {\n lock.unlock();\n }\n }\n return cacheData;\n}<\/code><\/pre>\n\n\n\npublic String selectUser(String userId) {\n String cacheData = cache.get(userId);\n if (StrUtil.isBlank(cacheData)) {\n \/\/ \u5224\u65ad Key \u662f\u5426\u5b58\u5728\u5e03\u9686\u8fc7\u6ee4\u5668\uff0c\u5b58\u5728\u5219\u7ee7\u7eed\u6d41\u7a0b\uff0c\u5426\u5219\u76f4\u63a5\u8fd4\u56de\n if (!bloomFilter.contains(fullShortUrl)) {\n throw new RuntimeException();\n }\n\u200b\n \/\/ \u5224\u65ad Key \u662f\u5426\u5305\u542b\u7a7a\u503c\u7f13\u5b58\uff0c\u5b58\u5728\u76f4\u63a5\u8fd4\u56de\uff0c\u4e0d\u5b58\u5728\u7ee7\u7eed\u6d41\u7a0b\n Boolean cacheIsNull = cache.hasKey(\"is-null_\" + userId);\n if (cacheIsNull) {\n throw new RuntimeException();\n }\n\u200b\n \/\/ \u83b7\u53d6\u5206\u5e03\u5f0f\u9501\n Lock lock = getLock(userId);\n lock.lock();\n\u200b\n try {\n \/\/ \u62ff\u5230\u9501\u4e4b\u540e\u8fdb\u884c\u53cc\u91cd\u5224\u5b9a\uff0c\u5982\u679c\u7f13\u5b58\u5df2\u7ecf\u5b58\u5728\u5219\u76f4\u63a5\u8fd4\u56de\u5373\u53ef\n cacheData = cache.get(userId);\n if (StrUtil.isNotBlank(cacheData)) {\n return cacheData;\n }\n\u200b\n \/\/ \u62ff\u5230\u9501\u4e4b\u540e\u8fdb\u884c\u53cc\u91cd\u5224\u5b9a\uff0c\u5982\u679c\u7a7a\u503c\u7f13\u5b58\u5df2\u7ecf\u5b58\u5728\u5219\u76f4\u63a5\u7ec8\u6b62\u6d41\u7a0b\u5373\u53ef\n cacheIsNull = cache.hasKey(\"is-null_\" + userId);\n if (!cacheIsNull) {\n throw new RuntimeException();\n }\n\u200b\n \/\/ \u6839\u636e\u7528\u6237\u6807\u8bc6\u67e5\u8be2\u6570\u636e\u5e93\u8bb0\u5f55\n String dbData = userMapper.selectId(userId);\n if (StrUtil.isNotBlank(dbData)) {\n cahce.set(userId, dbData);\n cacheData = dbData;\n } else {\n \/\/ \u67e5\u8be2\u6570\u636e\u5e93\u4e2d\u4e0d\u5b58\u5728\u6570\u636e\uff0c\u6dfb\u52a0\u7a7a\u503c\u7f13\u5b58\u5e76\u8fd4\u56de\n cache.set(\"is-null_\" + userId, \u8f83\u77ed\u8fc7\u671f\u65f6\u95f4);\n throw new RuntimeException();\n }\n } finally {\n lock.unlock();\n }\n }\n return cacheData;\n}<\/code><\/pre>\n\n\n\n\u4f18\u60e0\u5238\u6a21\u677f\u5f15\u5165\u7f13\u5b58\u7a7f\u900f\u89e3\u51b3\u65b9\u6848<\/h2>\n\n\n\n
1. \u521b\u5efa\u5e03\u9686\u8fc7\u6ee4\u5668<\/h3>\n\n\n\n
@Configuration\npublic class RBloomFilterConfiguration {\n\n \/**\n * \u4f18\u60e0\u5238\u67e5\u8be2\u7f13\u5b58\u7a7f\u900f\u5e03\u9686\u8fc7\u6ee4\u5668\n *\/\n @Bean\n public RBloomFilter<String> couponTemplateQueryBloomFilter(RedissonClient redissonClient) {\n RBloomFilter<String> bloomFilter = redissonClient.getBloomFilter(\"couponTemplateQueryBloomFilter\");\n bloomFilter.tryInit(640L, 0.001);\n return bloomFilter;\n }\n}\n<\/code><\/pre>\n\n\n\ntryInit<\/code> \u6709\u4e24\u4e2a\u53c2\u6570\uff0c\u4ee3\u8868\u9884\u4f30\u63d2\u5165\u91cf\u548c\u9519\u8bef\u6982\u7387\uff0c\u56e0\u4e3a\u4f1a\u6839\u636e\u8fd9\u4e24\u4e2a\u53c2\u6570\u8fdb\u884c\u521d\u59cb\u5316\u5e03\u9686\u8fc7\u6ee4\u5668\u7684\u4f4d\u6570\u7ec4\uff0c\u4e0d\u5efa\u8bae\u5927\u5bb6\u8bbe\u7f6e\u592a\u5927\u3002<\/p>\n\n\n\n2.1 \u9884\u8ba1\u63d2\u5165\u91cf expectedInsertions<\/h4>\n\n\n\n
2.2 \u9519\u8bef\u6982\u7387 falseProbability<\/h4>\n\n\n\n
2. \u521b\u5efa\u4f18\u60e0\u5238\u6a21\u677f\u6dfb\u52a0\u5e03\u9686\u8fc7\u6ee4\u5668<\/h3>\n\n\n\n
@Slf4j\n@Service\n@RequiredArgsConstructor\npublic class CouponTemplateServiceImpl extends ServiceImpl<CouponTemplateMapper, CouponTemplateDO> implements CouponTemplateService {\n\u200b\n \/\/ ......\n private final RBloomFilter<String> couponTemplateQueryBloomFilter;\n\u200b\n @Override\n public void createCouponTemplate(CouponTemplateSaveReqDTO requestParam) {\n \/\/ ......\n \/\/ \u6dfb\u52a0\u4f18\u60e0\u5238\u6a21\u677f ID \u5230\u5e03\u9686\u8fc7\u6ee4\u5668\n couponTemplateQueryBloomFilter.add(String.valueOf(couponTemplateDO.getId()));\n }\n}<\/code><\/pre>\n\n\n\n3. \u6539\u9020\u4f18\u60e0\u5238\u6a21\u677f\u67e5\u8be2\u7f13\u5b58\u7a7f\u900f<\/h3>\n\n\n\n
@Slf4j\n@Service\n@RequiredArgsConstructor\npublic class CouponTemplateServiceImpl extends ServiceImpl<CouponTemplateMapper, CouponTemplateDO> implements CouponTemplateService {\n\u200b\n private final RBloomFilter<String> couponTemplateQueryBloomFilter;\n\u200b\n @Override\n public CouponTemplateQueryRespDTO findCouponTemplate(CouponTemplateQueryReqDTO requestParam) {\n if (!couponTemplateQueryBloomFilter.contains(requestParam.getCouponTemplateId())) {\n throw new ClientException(\"\u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\");\n }\n\u200b\n LambdaQueryWrapper<CouponTemplateDO> queryWrapper = Wrappers.lambdaQuery(CouponTemplateDO.class)\n .eq(CouponTemplateDO::getShopNumber, Long.parseLong(requestParam.getShopNumber()))\n .eq(CouponTemplateDO::getId, Long.parseLong(requestParam.getCouponTemplateId()))\n .eq(CouponTemplateDO::getStatus, CouponTemplateStatusEnum.ACTIVE.getStatus());\n CouponTemplateDO couponTemplateDO = couponTemplateMapper.selectOne(queryWrapper);\n\u200b\n return BeanUtil.toBean(couponTemplateDO, CouponTemplateQueryRespDTO.class);\n }\n}<\/code><\/pre>\n\n\n\n4. \u6539\u9020\u7ec4\u5408\u65b9\u6848<\/h3>\n\n\n\n
@Slf4j\n@Service\n@RequiredArgsConstructor\npublic class CouponTemplateServiceImpl extends ServiceImpl<CouponTemplateMapper, CouponTemplateDO> implements CouponTemplateService {\n\n private final CouponTemplateMapper couponTemplateMapper;\n private final StringRedisTemplate stringRedisTemplate;\n private final RedissonClient redissonClient;\n private final RBloomFilter<String> couponTemplateQueryBloomFilter;\n\n @Override\n public CouponTemplateQueryRespDTO findCouponTemplate(CouponTemplateQueryReqDTO requestParam) {\n \/\/ \u67e5\u8be2 Redis \u7f13\u5b58\u4e2d\u662f\u5426\u5b58\u5728\u4f18\u60e0\u5238\u6a21\u677f\u4fe1\u606f\n String couponTemplateCacheKey = String.format(EngineRedisConstant.COUPON_TEMPLATE_KEY, requestParam.getCouponTemplateId());\n Map<Object, Object> couponTemplateCacheMap = stringRedisTemplate.opsForHash().entries(couponTemplateCacheKey);\n\n \/\/ \u5982\u679c\u5b58\u5728\u76f4\u63a5\u8fd4\u56de\uff0c\u4e0d\u5b58\u5728\u9700\u8981\u901a\u8fc7\u5e03\u9686\u8fc7\u6ee4\u5668\u3001\u7f13\u5b58\u7a7a\u503c\u4ee5\u53ca\u53cc\u91cd\u5224\u5b9a\u9501\u7684\u5f62\u5f0f\u8bfb\u53d6\u6570\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55\n if (MapUtil.isEmpty(couponTemplateCacheMap)) {\n \/\/ \u5224\u65ad\u5e03\u9686\u8fc7\u6ee4\u5668\u662f\u5426\u5b58\u5728\u6307\u5b9a\u6a21\u677f ID\uff0c\u4e0d\u5b58\u5728\u76f4\u63a5\u8fd4\u56de\u9519\u8bef\n if (!couponTemplateQueryBloomFilter.contains(requestParam.getCouponTemplateId())) {\n throw new ClientException(\"\u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\");\n }\n\n \/\/ \u67e5\u8be2 Redis \u7f13\u5b58\u4e2d\u662f\u5426\u5b58\u5728\u4f18\u60e0\u5238\u6a21\u677f\u7a7a\u503c\u4fe1\u606f\uff0c\u5982\u679c\u6709\u4ee3\u8868\u6a21\u677f\u4e0d\u5b58\u5728\uff0c\u76f4\u63a5\u8fd4\u56de\n String couponTemplateIsNullCacheKey = String.format(EngineRedisConstant.COUPON_TEMPLATE_IS_NULL_KEY, requestParam.getCouponTemplateId());\n Boolean hasKeyFlag = stringRedisTemplate.hasKey(couponTemplateIsNullCacheKey);\n if (hasKeyFlag) {\n throw new ClientException(\"\u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\");\n }\n\n \/\/ \u83b7\u53d6\u4f18\u60e0\u5238\u6a21\u677f\u5206\u5e03\u5f0f\u9501\n \/\/ \u5173\u4e8e\u7f13\u5b58\u51fb\u7a7f\u66f4\u591a\u6ce8\u91ca\u4e8b\u9879\uff0c\u6b22\u8fce\u67e5\u770b\u6211\u7684B\u7ad9\u89c6\u9891\uff1ahttps:\/\/www.bilibili.com\/video\/BV1qz421z7vC\n RLock lock = redissonClient.getLock(String.format(EngineRedisConstant.LOCK_COUPON_TEMPLATE_KEY, requestParam.getCouponTemplateId()));\n lock.lock();\n\n try {\n \/\/ \u53cc\u91cd\u5224\u5b9a\u7a7a\u503c\u7f13\u5b58\u662f\u5426\u5b58\u5728\uff0c\u5b58\u5728\u5219\u7ee7\u7eed\u629b\u5f02\u5e38\n hasKeyFlag = stringRedisTemplate.hasKey(couponTemplateIsNullCacheKey);\n if (hasKeyFlag) {\n throw new ClientException(\"\u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\");\n }\n\n \/\/ \u901a\u8fc7\u53cc\u91cd\u5224\u5b9a\u9501\u4f18\u5316\u5927\u91cf\u8bf7\u6c42\u65e0\u610f\u4e49\u67e5\u8be2\u6570\u636e\u5e93\n couponTemplateCacheMap = stringRedisTemplate.opsForHash().entries(couponTemplateCacheKey);\n if (MapUtil.isEmpty(couponTemplateCacheMap)) {\n LambdaQueryWrapper<CouponTemplateDO> queryWrapper = Wrappers.lambdaQuery(CouponTemplateDO.class)\n .eq(CouponTemplateDO::getShopNumber, Long.parseLong(requestParam.getShopNumber()))\n .eq(CouponTemplateDO::getId, Long.parseLong(requestParam.getCouponTemplateId()))\n .eq(CouponTemplateDO::getStatus, CouponTemplateStatusEnum.ACTIVE.getStatus());\n CouponTemplateDO couponTemplateDO = couponTemplateMapper.selectOne(queryWrapper);\n\n \/\/ \u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\u6216\u8005\u5df2\u8fc7\u671f\u52a0\u5165\u7a7a\u503c\u7f13\u5b58\uff0c\u5e76\u4e14\u629b\u51fa\u5f02\u5e38\n if (couponTemplateDO == null) {\n stringRedisTemplate.opsForValue().set(couponTemplateIsNullCacheKey, \"\", 30, TimeUnit.MINUTES);\n throw new ClientException(\"\u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\u6216\u5df2\u8fc7\u671f\");\n }\n\n \/\/ \u901a\u8fc7\u5c06\u6570\u636e\u5e93\u7684\u8bb0\u5f55\u5e8f\u5217\u5316\u6210 JSON \u5b57\u7b26\u4e32\u653e\u5165 Redis \u7f13\u5b58\n CouponTemplateQueryRespDTO actualRespDTO = BeanUtil.toBean(couponTemplateDO, CouponTemplateQueryRespDTO.class);\n Map<String, Object> cacheTargetMap = BeanUtil.beanToMap(actualRespDTO, false, true);\n Map<String, String> actualCacheTargetMap = cacheTargetMap.entrySet().stream()\n .collect(Collectors.toMap(\n Map.Entry::getKey,\n entry -> entry.getValue() != null ? entry.getValue().toString() : \"\"\n ));\n\n \/\/ \u901a\u8fc7 LUA \u811a\u672c\u6267\u884c\u8bbe\u7f6e Hash \u6570\u636e\u4ee5\u53ca\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\n String luaScript = \"redis.call('HMSET', KEYS[1], unpack(ARGV, 1, #ARGV - 1)) \" +\n \"redis.call('EXPIREAT', KEYS[1], ARGV[#ARGV])\";\n\n List<String> keys = Collections.singletonList(couponTemplateCacheKey);\n List<String> args = new ArrayList<>(actualCacheTargetMap.size() * 2 + 1);\n actualCacheTargetMap.forEach((key, value) -> {\n args.add(key);\n args.add(value);\n });\n\n \/\/ \u4f18\u60e0\u5238\u6d3b\u52a8\u8fc7\u671f\u65f6\u95f4\u8f6c\u6362\u4e3a\u79d2\u7ea7\u522b\u7684 Unix \u65f6\u95f4\u6233\n args.add(String.valueOf(couponTemplateDO.getValidEndTime().getTime() \/ 1000));\n\n \/\/ \u6267\u884c LUA \u811a\u672c\n stringRedisTemplate.execute(\n new DefaultRedisScript<>(luaScript, Long.class),\n keys,\n args.toArray()\n );\n couponTemplateCacheMap = cacheTargetMap.entrySet()\n .stream()\n .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));\n }\n } finally {\n lock.unlock();\n }\n }\n\n return BeanUtil.mapToBean(couponTemplateCacheMap, CouponTemplateQueryRespDTO.class, false, CopyOptions.create());\n }\n\n \/**\n * \u7f13\u5b58\u51fb\u7a7f\u89e3\u51b3\u65b9\u6848\n *\/\n public CouponTemplateQueryRespDTO findCouponTemplateV1(CouponTemplateQueryReqDTO requestParam) {\n \/\/ \u67e5\u8be2 Redis \u7f13\u5b58\u4e2d\u662f\u5426\u5b58\u5728\u4f18\u60e0\u5238\u6a21\u677f\u4fe1\u606f\n String couponTemplateCacheKey = String.format(EngineRedisConstant.COUPON_TEMPLATE_KEY, requestParam.getCouponTemplateId());\n Map<Object, Object> couponTemplateCacheMap = stringRedisTemplate.opsForHash().entries(couponTemplateCacheKey);\n\n \/\/ \u5982\u679c\u5b58\u5728\u76f4\u63a5\u8fd4\u56de\uff0c\u4e0d\u5b58\u5728\u9700\u8981\u901a\u8fc7\u53cc\u91cd\u5224\u5b9a\u9501\u7684\u5f62\u5f0f\u8bfb\u53d6\u6570\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55\n if (MapUtil.isEmpty(couponTemplateCacheMap)) {\n \/\/ \u83b7\u53d6\u4f18\u60e0\u5238\u6a21\u677f\u5206\u5e03\u5f0f\u9501\n \/\/ \u5173\u4e8e\u7f13\u5b58\u51fb\u7a7f\u66f4\u591a\u6ce8\u91ca\u4e8b\u9879\uff0c\u6b22\u8fce\u67e5\u770b\u6211\u7684B\u7ad9\u89c6\u9891\uff1ahttps:\/\/www.bilibili.com\/video\/BV1qz421z7vC\n RLock lock = redissonClient.getLock(String.format(EngineRedisConstant.LOCK_COUPON_TEMPLATE_KEY, requestParam.getCouponTemplateId()));\n lock.lock();\n\n try {\n \/\/ \u901a\u8fc7\u53cc\u91cd\u5224\u5b9a\u9501\u4f18\u5316\u5927\u91cf\u8bf7\u6c42\u65e0\u610f\u4e49\u67e5\u8be2\u6570\u636e\u5e93\n couponTemplateCacheMap = stringRedisTemplate.opsForHash().entries(couponTemplateCacheKey);\n if (MapUtil.isEmpty(couponTemplateCacheMap)) {\n LambdaQueryWrapper<CouponTemplateDO> queryWrapper = Wrappers.lambdaQuery(CouponTemplateDO.class)\n .eq(CouponTemplateDO::getShopNumber, Long.parseLong(requestParam.getShopNumber()))\n .eq(CouponTemplateDO::getId, Long.parseLong(requestParam.getCouponTemplateId()))\n .eq(CouponTemplateDO::getStatus, CouponTemplateStatusEnum.ACTIVE.getStatus());\n CouponTemplateDO couponTemplateDO = couponTemplateMapper.selectOne(queryWrapper);\n\n \/\/ \u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\u6216\u8005\u5df2\u8fc7\u671f\u76f4\u63a5\u629b\u51fa\u5f02\u5e38\n if (couponTemplateDO == null) {\n throw new ClientException(\"\u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\u6216\u5df2\u8fc7\u671f\");\n }\n\n \/\/ \u901a\u8fc7\u5c06\u6570\u636e\u5e93\u7684\u8bb0\u5f55\u5e8f\u5217\u5316\u6210 JSON \u5b57\u7b26\u4e32\u653e\u5165 Redis \u7f13\u5b58\n CouponTemplateQueryRespDTO actualRespDTO = BeanUtil.toBean(couponTemplateDO, CouponTemplateQueryRespDTO.class);\n Map<String, Object> cacheTargetMap = BeanUtil.beanToMap(actualRespDTO, false, true);\n Map<String, String> actualCacheTargetMap = cacheTargetMap.entrySet().stream()\n .collect(Collectors.toMap(\n Map.Entry::getKey,\n entry -> entry.getValue() != null ? entry.getValue().toString() : \"\"\n ));\n\n \/\/ \u901a\u8fc7 LUA \u811a\u672c\u6267\u884c\u8bbe\u7f6e Hash \u6570\u636e\u4ee5\u53ca\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\n String luaScript = \"redis.call('HMSET', KEYS[1], unpack(ARGV, 1, #ARGV - 1)) \" +\n \"redis.call('EXPIREAT', KEYS[1], ARGV[#ARGV])\";\n\n List<String> keys = Collections.singletonList(couponTemplateCacheKey);\n List<String> args = new ArrayList<>(actualCacheTargetMap.size() * 2 + 1);\n actualCacheTargetMap.forEach((key, value) -> {\n args.add(key);\n args.add(value);\n });\n\n \/\/ \u4f18\u60e0\u5238\u6d3b\u52a8\u8fc7\u671f\u65f6\u95f4\u8f6c\u6362\u4e3a\u79d2\u7ea7\u522b\u7684 Unix \u65f6\u95f4\u6233\n args.add(String.valueOf(couponTemplateDO.getValidEndTime().getTime() \/ 1000));\n\n \/\/ \u6267\u884c LUA \u811a\u672c\n stringRedisTemplate.execute(\n new DefaultRedisScript<>(luaScript, Long.class),\n keys,\n args.toArray()\n );\n couponTemplateCacheMap = cacheTargetMap.entrySet()\n .stream()\n .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));\n }\n } finally {\n lock.unlock();\n }\n }\n\n return BeanUtil.mapToBean(couponTemplateCacheMap, CouponTemplateQueryRespDTO.class, false, CopyOptions.create());\n }\n\n \/**\n * \u7f13\u5b58\u7a7f\u900f\u89e3\u51b3\u65b9\u6848\u4e4b\u5e03\u9686\u8fc7\u6ee4\u5668\n *\/\n public CouponTemplateQueryRespDTO findCouponTemplateV2(CouponTemplateQueryReqDTO requestParam) {\n \/\/ \u5224\u65ad\u5e03\u9686\u8fc7\u6ee4\u5668\u662f\u5426\u5b58\u5728\u6307\u5b9a\u6a21\u677f ID\uff0c\u4e0d\u5b58\u5728\u76f4\u63a5\u8fd4\u56de\u9519\u8bef\n if (!couponTemplateQueryBloomFilter.contains(requestParam.getCouponTemplateId())) {\n throw new ClientException(\"\u4f18\u60e0\u5238\u6a21\u677f\u4e0d\u5b58\u5728\");\n }\n\n LambdaQueryWrapper<CouponTemplateDO> queryWrapper = Wrappers.lambdaQuery(CouponTemplateDO.class)\n .eq(CouponTemplateDO::getShopNumber, Long.parseLong(requestParam.getShopNumber()))\n .eq(CouponTemplateDO::getId, Long.parseLong(requestParam.getCouponTemplateId()))\n .eq(CouponTemplateDO::getStatus, CouponTemplateStatusEnum.ACTIVE.getStatus());\n CouponTemplateDO couponTemplateDO = couponTemplateMapper.selectOne(queryWrapper);\n\n return BeanUtil.toBean(couponTemplateDO, CouponTemplateQueryRespDTO.class);\n }\n}\n<\/code><\/pre>\n\n\n\n\n
\u5e38\u89c1\u95ee\u9898\u7b54\u7591<\/h2>\n\n\n\n
1. \u5e03\u9686\u8fc7\u6ee4\u5668\u8bbe\u7f6e\u591a\u5927\u5bb9\u91cf\uff1f<\/h3>\n\n\n\n
Bloom filter size can't be greater than 4294967294. But calculated size is 431327626981<\/code><\/p>\n\n\n\nBloom filter size can't be greater than 4294967294. But calculated size is 287551751321<\/code><\/p>\n\n\n\n![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/954e1480ea8b110721b975e9ed3c22b8.png\")
<\/p>\n\n\n\n2. \u5206\u5e03\u5f0f\u9501 lock \u4f1a\u89e6\u53d1\u957f\u65f6\u95f4\u963b\u585e\u4e48\uff1f<\/h3>\n\n\n\n
\u7b2c18\u5c0f\u8282\uff1a\u5982\u4f55\u8bbe\u7f6eRedis\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff1f<\/h2>\n\n\n\n
\u4e1a\u52a1\u80cc\u666f<\/h2>\n\n\n\n
\u4ec0\u4e48\u662f\u5185\u5b58\u6dd8\u6c70\uff1f<\/h2>\n\n\n\n
maxmemory-policy<\/code> \u914d\u7f6e\u6307\u5b9a\u7b56\u7565\u3002<\/p>\n\n\n\n\n
noeviction<\/code>\uff0c\u4e0d\u6dd8\u6c70\u4efb\u4f55 key\uff0c\u76f4\u63a5\u62a5\u9519\u3002\u5b83\u662f\u9ed8\u8ba4\u7b56\u7565\u3002<\/li>\n\n\n\nvolatile-random<\/code>\uff1a\u4ece\u6240\u6709\u8bbe\u7f6e\u4e86\u5230\u671f\u65f6\u95f4\u7684 Key \u4e2d\uff0c\u968f\u673a\u6dd8\u6c70\u4e00\u4e2a Key\u3002<\/li>\n\n\n\nvolatile-lru<\/code>\uff1a \u4ece\u6240\u6709\u8bbe\u7f6e\u4e86\u5230\u671f\u65f6\u95f4\u7684 Key \u4e2d\uff0c\u6dd8\u6c70\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684 Key\u3002<\/li>\n\n\n\nvolatile-lfu<\/code>\uff1a \u4ece\u6240\u6709\u8bbe\u7f6e\u4e86\u5230\u671f\u65f6\u95f4\u7684 Key \u4e2d\uff0c\u6dd8\u6c70\u6700\u8fd1\u6700\u4e0d\u5e38\u7528\u4f7f\u7528\u7684 Key\uff084.0 \u65b0\u589e\uff09\u3002<\/li>\n\n\n\nvolatile-ttl<\/code>\uff1a \u4ece\u6240\u6709\u8bbe\u7f6e\u4e86\u5230\u671f\u65f6\u95f4\u7684 Key \u4e2d\uff0c\u4f18\u5148\u6dd8\u6c70\u6700\u65e9\u8fc7\u671f\u7684 Key\u3002<\/li>\n\n\n\nallkeys-random<\/code>\uff1a\u4ece\u6240\u6709 Key \u4e2d\uff0c\u968f\u673a\u6dd8\u6c70\u4e00\u4e2a\u952e\u3002<\/li>\n\n\n\nallkeys-lru<\/code>\uff1a \u4ece\u6240\u6709 Key \u4e2d\uff0c\u6dd8\u6c70\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684 Key\u3002<\/li>\n\n\n\nallkeys-lfu<\/code>\uff1a \u4ece\u6240\u6709 Key \u4e2d\uff0c\u6dd8\u6c70\u6700\u8fd1\u6700\u4e0d\u5e38\u7528\u4f7f\u7528\u7684\u952e\uff084.0 \u65b0\u589e\uff09\u3002<\/li>\n<\/ul>\n\n\n\n\u4ec0\u4e48\u662f\u7f13\u5b58\u6c61\u67d3\u95ee\u9898\uff1f<\/h2>\n\n\n\n
\u6dd8\u6c70\u7b56\u7565\u5bf9\u7f13\u5b58\u51fb\u7a7f\u7684\u5f71\u54cd\uff1f<\/h2>\n\n\n\n
\n
allkeys-random<\/code>\uff1a\u4ece\u6240\u6709 Key \u4e2d\uff0c\u968f\u673a\u6dd8\u6c70\u4e00\u4e2a\u952e\u3002<\/li>\n\n\n\nallkeys-lru<\/code>\uff1a \u4ece\u6240\u6709 Key \u4e2d\uff0c\u6dd8\u6c70\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684 Key\u3002<\/li>\n\n\n\nallkeys-lfu<\/code>\uff1a \u4ece\u6240\u6709 Key \u4e2d\uff0c\u6dd8\u6c70\u6700\u8fd1\u6700\u4e0d\u5e38\u7528\u4f7f\u7528\u7684\u952e\uff084.0 \u65b0\u589e\uff09\u3002<\/li>\n<\/ul>\n\n\n\n\n
noeviction<\/code>\uff0c\u4e0d\u6dd8\u6c70\u4efb\u4f55 Key\uff0c\u76f4\u63a5\u62a5\u9519\u3002<\/li>\n\n\n\nvolatile-random<\/code>\uff1a\u4ece\u6240\u6709\u8bbe\u7f6e\u4e86\u5230\u671f\u65f6\u95f4\u7684 Key \u4e2d\uff0c\u968f\u673a\u6dd8\u6c70\u4e00\u4e2a Key\u3002<\/li>\n\n\n\nvolatile-lru<\/code>\uff1a \u4ece\u6240\u6709\u8bbe\u7f6e\u4e86\u5230\u671f\u65f6\u95f4\u7684 Key \u4e2d\uff0c\u6dd8\u6c70\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684 Key\u3002<\/li>\n\n\n\nvolatile-lfu<\/code>\uff1a \u4ece\u6240\u6709\u8bbe\u7f6e\u4e86\u5230\u671f\u65f6\u95f4\u7684 Key \u4e2d\uff0c\u6dd8\u6c70\u6700\u8fd1\u6700\u4e0d\u5e38\u7528\u4f7f\u7528\u7684 Key\uff084.0 \u65b0\u589e\uff09\u3002<\/li>\n\n\n\nvolatile-ttl<\/code>\uff1a \u4ece\u6240\u6709\u8bbe\u7f6e\u4e86\u5230\u671f\u65f6\u95f4\u7684 Key \u4e2d\uff0c\u4f18\u5148\u6dd8\u6c70\u6700\u65e9\u8fc7\u671f\u7684 Key\u3002<\/li>\n<\/ul>\n\n\n\n\u725b\u5238\u9009\u62e9\u54ea\u4e2a\u6dd8\u6c70\u7b56\u7565\uff1f<\/h2>\n\n\n\n
noeviction<\/code> \u4e0d\u6dd8\u6c70\u4efb\u4f55\u4efb\u4f55\u6570\u636e\u3002<\/p>\n\n\n\nvolatile-lfu<\/code>\uff0c\u53ef\u4ee5\u6709\u6548\u907f\u514d LRU \u7684\u7f13\u5b58\u6c61\u67d3\u95ee\u9898\u3002<\/p>\n\n\n\n
\n\n\n\n\u5185\u5b58\u6dd8\u6c70\u5e95\u5c42\u539f\u7406<\/h2>\n\n\n\n
1. \u6dd8\u6c70\u8fc7\u7a0b<\/h3>\n\n\n\n
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maxmemory<\/code>\uff0c\u5e76\u8bbe\u7f6e\u4e86\u6dd8\u6c70\u7b56\u7565\u5f0f\uff0c\u5219\u4f1a\u5c1d\u8bd5\u8fdb\u884c\u4e00\u6b21 Key \u6dd8\u6c70\uff1b<\/li>\n\n\n\nmaxmemory<\/code>\uff0c\u5982\u679c\u6ca1\u6709\u5219\u76f4\u63a5\u8fd4\u56de\uff0c\u5426\u5219\u5c06\u8ba1\u7b97\u5f53\u524d\u9700\u8981\u91ca\u653e\u591a\u5c11\u5185\u5b58\uff0c\u968f\u540e\u5f00\u59cb\u6839\u636e\u7b56\u7565\u6dd8\u6c70\u7b26\u5408\u6761\u4ef6\u7684 Key\uff1b\u5f53\u5f00\u59cb\u8fdb\u884c\u6dd8\u6c70\u65f6\uff0c\u5c06\u4f1a\u4f9d\u6b21\u5bf9\u6bcf\u4e2a\u6570\u636e\u5e93\u8fdb\u884c\u62bd\u6837\uff0c\u62bd\u6837\u7684\u6570\u636e\u8303\u56f4\u7531\u7b56\u7565\u51b3\u5b9a\uff0c\u800c\u6837\u672c\u6570\u91cf\u5219\u7531 maxmemory-samples<\/code>\u914d\u7f6e\u51b3\u5b9a\uff1b<\/li>\n\n\n\nEvictionPoolLRU<\/code> \u6570\u7ec4\u4e2d\uff0c\u5b83\u76f8\u5f53\u4e8e\u4e00\u4e2a\u4e34\u65f6\u7f13\u51b2\u533a\uff0c\u5f53\u6570\u7ec4\u586b\u6ee1\u4ee5\u540e\u5373\u5c06\u91cc\u9762\u5168\u90e8\u7684 Key \u8fdb\u884c\u5220\u9664\u3002<\/li>\n\n\n\nunsigned int dictGetSomeKeys(dict *d, dictEntry **des, unsigned int count) {\n unsigned long j; \/* internal hash table id, 0 or 1. *\/\n unsigned long tables; \/* 1 or 2 tables? *\/\n unsigned long stored = 0, maxsizemask;\n unsigned long maxsteps;\n\u200b\n if (dictSize(d) < count) count = dictSize(d);\n maxsteps = count*10;\n\u200b\n \/\/ \u5982\u679c\u5b57\u5178\u6b63\u5728\u8fc1\u79fb\uff0c\u5219\u534f\u52a9\u8fc1\u79fb\n for (j = 0; j < count; j++) {\n if (dictIsRehashing(d))\n _dictRehashStep(d);\n else\n break;\n }\n\u200b\n tables = dictIsRehashing(d) ? 2 : 1;\n maxsizemask = d->ht[0].sizemask;\n if (tables > 1 && maxsizemask < d->ht[1].sizemask)\n maxsizemask = d->ht[1].sizemask;\n\u200b\n unsigned long i = random() & maxsizemask;\n unsigned long emptylen = 0;\n\u200b\n \/\/ \u5f53\u5df2\u7ecf\u91c7\u96c6\u5230\u8db3\u591f\u7684\u6837\u672c\uff0c\u6216\u8005\u91cd\u8bd5\u5df2\u8fbe\u4e0a\u9650\u5219\u7ed3\u675f\u91c7\u6837\n while(stored < count && maxsteps--) {\n for (j = 0; j < tables; j++) {\n if (tables == 2 && j == 0 && i < (unsigned long) d->rehashidx) {\n if (i >= d->ht[1].size)\n i = d->rehashidx;\n else\n continue;\n }\n\u200b\n \/\/ \u5982\u679c\u4e00\u4e2a\u5e93\u7684\u5230\u671f\u5b57\u5178\u5df2\u7ecf\u5904\u7406\u5b8c\u6bd5\uff0c\u5219\u5904\u7406\u4e0b\u4e00\u4e2a\u5e93\n if (i >= d->ht[j].size) continue;\n dictEntry *he = d->ht[j].table[i];\n\u200b\n \/\/ \u8fde\u7eed\u904d\u5386\u591a\u4e2a\u6876\uff0c\u5982\u679c\u591a\u4e2a\u6876\u90fd\u662f\u7a7a\u7684\uff0c\u90a3\u4e48\u968f\u673a\u8df3\u5230\u53e6\u4e00\u4e2a\u4f4d\u7f6e\uff0c\u7136\u540e\u518d\u91cd\u590d\u6b64\u6b65\u9aa4 \n if (he == NULL) {\n emptylen++;\n if (emptylen >= 5 && emptylen > count) {\n i = random() & maxsizemask;\n emptylen = 0;\n }\n } else {\n emptylen = 0;\n while (he) {\n *des = he;\n des++;\n he = he->next;\n stored++;\n if (stored == count) return stored;\n }\n }\n }\n\u200b\n \/\/ \u67e5\u627e\u4e0b\u4e00\u4e2a\u6876\n i = (i+1) & maxsizemask;\n }\n return stored;\n}<\/code><\/pre>\n\n\n\n2. LRU \u5b9e\u73b0<\/h3>\n\n\n\n
Least Recently Used<\/code>\uff0c\u4e5f\u5c31\u662f\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u3002\u4e00\u822c\u6765\u8bf4\uff0cLRU \u4f1a\u4ece\u4e00\u6279 Key \u4e2d\u6dd8\u6c70\u4e0a\u6b21\u8bbf\u95ee\u65f6\u95f4\u6700\u65e9\u7684 key\u3002<\/p>\n\n\n\nGuava Cache<\/code>\u3001Caffeine<\/code>\u7b49\u7f13\u5b58\u5e93\u4e2d\u90fd\u63d0\u4f9b\u4e86\u7c7b\u4f3c\u7684\u5b9e\u73b0\u3002\u6211\u4eec\u81ea\u5df1\u4e5f\u53ef\u4ee5\u57fa\u4e8e JDK \u7684 LinkedHashMap<\/code> \u5b9e\u73b0\u652f\u6301 LRU \u7b97\u6cd5\u7684\u7f13\u5b58\u529f\u80fd\u3002<\/p>\n\n\n\n2.1 \u8fd1\u4f3c LRU<\/h4>\n\n\n\n
![\"\"](\"https:\/\/i-blog.csdnimg.cn\/img_convert\/f9a85633ef9c457710f624cd90bda6a9.png\")
\u200b<\/p>\n\n\n\nNearlyLRU<\/code>\uff09\u3002<\/p>\n\n\n\n
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