{"id":1232,"date":"2025-09-16T14:20:45","date_gmt":"2025-09-16T06:20:45","guid":{"rendered":"https:\/\/eve2333.top\/?p=1232"},"modified":"2025-09-16T14:20:45","modified_gmt":"2025-09-16T06:20:45","slug":"java70%e8%a1%8c%e4%bb%a3%e7%a0%81%e6%89%8b%e6%90%93%e5%ae%9a%e6%97%b6%e4%bb%bb%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/eve2333.top\/?p=1232","title":{"rendered":"java70\u884c\u4ee3\u7801\u624b\u6413\u5b9a\u65f6\u4efb\u52a1"},"content":{"rendered":"\n

\u200b<\/p>\n\n\n\n

\u611f\u8c22\u5b66java\u7684\u751f\u751f\u63d0\u4f9b\u7684\u89c6\u9891\uff0c\u8ba9\u6211\u80fd\u591f\u901f\u6210\u90e8\u5206\u5b9e\u8df5\u516b\u80a1\uff0c\u5f25\u8865\u4e86\u6211\u6ca1\u6709\u597d\u597d\u770b\u548c\u5b66\u4e60\u56fd\u5916CS\u8bfe\u7a0b\u7684\u7f3a\u61be<\/p>\n\n\n\n

\u73b0\u5728\u6709\u4e00\u4e2aMain\u51fd\u6570\uff0c\u6211\u4eec\u8981\u5b9e\u73b0\u91cc\u9762scheduleService\u65b9\u6cd5\uff08\u5c31\u662f\u5b9e\u73b0@Schedule\u6ce8\u89e3\uff09\uff0c\u8ba9main\u51fd\u6570\u6b63\u5e38\u5b9e\u4e60<\/p>\n\n\n\n

package tech.insight;\n\n\/**\n * @author gongxuanzhangmeit@gmail.com\n *\/\npublic class Main {\n    public static void main(String[] args) throws InterruptedException {\n        ScheduleService scheduleService = new ScheduleService();\n        scheduleService.schedule(() -> {\n            System.out.println(1);\n        }, 1000);\n\n        Thread.sleep(1000);\n        System.out.println(\"\u6dfb\u52a0\u4e00\u4e2a\u6bcf200\u6beb\u79d2\u6253\u5370\u4e00\u4e2a2\u7684\u5b9a\u65f6\u4efb\u52a1\");\n        scheduleService.schedule(() -> {\n            System.out.println(2);\n        }, 200);\n    }\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
package tech.insight;\n\n\/**\n * @author gongxuanzhangmelt@gmail.com\n *\/\npublic class ScheduleService {\n\n    void schedule(Runnable task, long delay) {\n        \/\/ TODO\n    }\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u8fd9\u662f\u4e00\u4e2a\u65b0\u7684\u5de5\u7a0b\u3002\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u7c7b\uff0c\u8fd9\u4e2a\u7c7b\u6709\u4e00\u4e2a\u51fd\u6570 `schedule`\uff0c\u5b83\u6709\u4e24\u4e2a\u53c2\u6570\uff1a\u7b2c\u4e00\u4e2a\u662f\u4e00\u4e2a\u4efb\u52a1\uff08task\uff09\uff0c\u7b2c\u4e8c\u4e2a\u662f\u4e00\u4e2a\u5ef6\u8fdf\u65f6\u95f4\uff08delay\uff09\uff0c\u5355\u4f4d\u662f\u6beb\u79d2\u3002\u6bcf\u9694\u8fd9\u4e48\u591a\u6beb\u79d2\uff0c\u6211\u4eec\u4f1a\u8ba9\u8fd9\u4e2a\u4efb\u52a1\u81ea\u52a8\u6267\u884c\u4e00\u6b21\u3002\u4e00\u822c\u6765\u8bf4\u8fd9\u91cc\u53ef\u4ee5\u52a0\u4e00\u4e2a `TimeUnit`\uff0c\u4f46\u6211\u4eec\u9ed8\u8ba4\u4f7f\u7528\u6beb\u79d2\u3002<\/p>\n\n\n\n
\u6211\u4eec\u53ef\u4ee5\u5148\u5199\u4e00\u4e2a\u201c\u6162\u51fd\u6570\u201d\uff0c\u8fd9\u4e2a\u6162\u51fd\u6570\u76f4\u63a5\u8c03\u7528\u67d0\u4e2a\u65b9\u6cd5\uff0c\u6bd4\u5982\u6253\u5370\u4e00\u4e2a\u201c1\u201d\u3002\u6211\u4eec\u5e0c\u671b\u5b83\u6bcf\u9694100\u6beb\u79d2\u6253\u5370\u4e00\u6b21\u201c1\u201d\u3002\u5f53\u7136\uff0c\u5728\u4e3b\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u4e0d\u80fd\u963b\u585e\u4e3b\u7ebf\u7a0b\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5728\u4e3b\u51fd\u6570\u91cc\u5148\u7761\u7720\u4e00\u79d2\uff0c\u7136\u540e\u6dfb\u52a0\u4e00\u4e2a\u6bcf200\u6beb\u79d2\u6253\u5370\u4e00\u6b21\u201c2\u201d\u7684\u5b9a\u65f6\u4efb\u52a1\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u5728\u4e00\u79d2\u4e4b\u540e\uff0c\u518d\u6dfb\u52a0\u4e00\u4e2a\u6bcf200\u6beb\u79d2\u6253\u5370\u201c2\u201d\u7684\u4efb\u52a1\u3002<\/p>\n\n\n\n
\u63a5\u4e0b\u6765\u6211\u4eec\u8981\u5b9e\u73b0 `schedule` \u65b9\u6cd5\uff0c\u4f7f\u5f97\u8fd9\u4e2a\u201c\u6162\u51fd\u6570\u201d\u80fd\u591f\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n\n\n\n
\u9996\u5148\u601d\u8003\u4e00\u4e2a\u95ee\u9898\uff1a\u8fd9\u4e2a\u4efb\u52a1\u662f\u7531\u8c01\u6765\u6267\u884c\u7684\uff1f\u6211\u4eec\u53ef\u4ee5\u968f\u4fbf\u5b9a\u4e49\u4e00\u4e2a\u7ebf\u7a0b\u6c60\uff0c\u65e0\u6240\u8c13\u3002\u95ee\u9898\u662f\uff0c\u5982\u4f55\u7528\u7ebf\u7a0b\u6c60\u53bb\u6267\u884c\u4e00\u4e2a\u5e26\u5ef6\u8fdf\u7684\u4efb\u52a1\uff1f \u6700\u76f4\u89c2\u7684\u60f3\u6cd5\u5c31\u662f\u65b0\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u6c60\u7ebf\u7a0b\uff0c\u8ba9\u4ed6\u6309\u7167\u8981\u6c42sleep\u90a3\u4e48\u51e0\u79d2\uff0c\u4f46\u662f\u6709\u95ee\u9898\uff1a\u4e0b\u4e00\u6b21\u4ec0\u4e48\u65f6\u5019\u80fd\u6267\u884c\uff1f\u76ee\u524d\u8fd9\u4e2a\u4efb\u52a1\u53ea\u80fd\u6267\u884c\u4e00\u6b21\uff0c\u4e5f\u6ca1\u6709\u5ef6\u8fdf\u3002\u6211\u4eec\u80fd\u4e0d\u80fd\u7b80\u5355\u7c97\u66b4\u5730\u8ba9\u7ebf\u7a0b\u5148 `sleep(delay)` \u6beb\u79d2\uff0c\u7136\u540e\u76f4\u63a5\u8c03\u7528 `task.run()`\uff1f\u5176\u5b9e\u662f\u53ef\u4ee5\u7684\uff0c\u4f46\u8fd9\u4f1a\u5e26\u6765\u51e0\u4e2a\u95ee\u9898\u3002<\/p>\n\n\n\n
void schedule(Runnable task, long delay) {\n    ExecutorService executorService = Executors.newFixedThreadPool(6);\n    executorService.execute(() -> {\n        Thread.sleep(delay);\n        task.run();\n    });\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u7b2c\u4e00\u4e2a\u95ee\u9898\u662f\uff1a\u4e0b\u4e00\u6b21\u4ec0\u4e48\u65f6\u5019\u6267\u884c\uff1f\u6211\u4eec\u53ef\u4ee5\u5199\u4e00\u4e2a\u6b7b\u5faa\u73af\uff0c\u5728\u4efb\u52a1\u6267\u884c\u5b8c\u540e\u518d\u6b21\u7761\u7720 `delay` \u65f6\u95f4\uff0c\u7136\u540e\u7ee7\u7eed\u6267\u884c\u3002\u4f46\u8fd9\u6837\u53c8\u5f15\u51fa\u53e6\u4e00\u4e2a\u95ee\u9898\uff1a\u5982\u679c\u6211\u4eec\u4f7f\u7528\u7684\u7ebf\u7a0b\u6c60\u53ea\u6709\u516d\u4e2a\u7ebf\u7a0b\uff0c\u90a3\u4e48\u6700\u591a\u53ea\u80fd\u540c\u65f6\u5904\u7406\u516d\u4e2a\u4efb\u52a1\u3002\u5f53\u7528\u6237\u7b2c\u4e03\u6b21\u8c03\u7528 `schedule` \u65f6\uff0c\u7ebf\u7a0b\u6c60\u5c31\u4f1a\u8017\u5c3d\uff0c\u65e0\u6cd5\u63d0\u4ea4\u65b0\u4efb\u52a1\uff0c\u663e\u7136\u8fd9\u4e0d\u7b26\u5408\u6211\u4eec\u7684\u9700\u6c42\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u66f4\u597d\u7684\u8bbe\u8ba1\u601d\u8def\u3002\u8bbe\u60f3\u6709\u4e00\u4e2a\u7ec4\u4ef6\uff0c\u5b83\u53ef\u4ee5\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u70b9\u81ea\u52a8\u628a\u4efb\u52a1\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60\u4e2d\uff0c\u800c\u4e0d\u662f\u5728\u8c03\u7528 `schedule` \u7684\u65f6\u5019\u7acb\u5373\u63d0\u4ea4\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5982\u679c\u6709\u4e00\u4e2a\u7ec4\u4ef6\u53eb\u201c\u89e6\u53d1\u5668\u201d\uff08Trigger\uff09\uff0c\u5b83\u8d1f\u8d23\u7b49\u5f85\u5408\u9002\u7684\u65f6\u95f4\uff0c\u7136\u540e\u628a\u4efb\u52a1\u6254\u8fdb\u7ebf\u7a0b\u6c60\uff0c\u800c\u7ebf\u7a0b\u6c60\u53ea\u8d1f\u8d23\u6267\u884c\u4efb\u52a1\u672c\u8eab\uff0c\u4e0d\u8d1f\u8d23\u8c03\u5ea6\u65f6\u95f4\uff0c\u90a3\u662f\u4e0d\u662f\u5c31\u80fd\u89e3\u51b3\u95ee\u9898\u4e86\uff1f<\/p>\n\n\n\n
\u6240\u4ee5\u8fd9\u4e2a\u5b9a\u65f6\u4efb\u52a1\u7684\u6838\u5fc3\u5c31\u5728\u4e8e\u8fd9\u4e2a\u201c\u89e6\u53d1\u5668\u201d\u5982\u4f55\u5b9e\u73b0\u3002<\/p>\n\n\n\n
\u6839\u636e\u4e0a\u9762\u7684\u5206\u6790\uff0c\u6211\u4eec\u91cd\u65b0\u8c03\u6574\u4ee3\u7801\u7ed3\u6784\u3002\u9996\u5148\uff0c\u628a\u771f\u6b63\u6267\u884c\u4efb\u52a1\u7684\u7ebf\u7a0b\u6c60\u4f5c\u4e3a\u6210\u5458\u53d8\u91cf\u6216\u5c40\u90e8\u53d8\u91cf\u521b\u5efa\u51fa\u6765\uff0c\u7ebf\u7a0b\u6c60\u7684\u5177\u4f53\u7c7b\u578b\u53ef\u4ee5\u6839\u636e\u9700\u8981\u914d\u7f6e\u3002\u7136\u540e\u6211\u4eec\u5b9a\u4e49\u4e00\u4e2a\u5185\u90e8\u7c7b\uff0c\u53eb\u505a `Trigger`\uff0c\u5b83\u7684\u804c\u8d23\u975e\u5e38\u5355\u4e00\uff1a\u7b49\u5f85\u6b63\u786e\u7684\u6267\u884c\u65f6\u95f4\uff0c\u5e76\u5c06\u4efb\u52a1\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60\u3002<\/p>\n\n\n\n
\u90a3\u4e48\u600e\u4e48\u5b9e\u73b0\u8fd9\u4e2a `Trigger` \u5462\uff1f\u7531\u4e8e\u5b83\u9700\u8981\u6301\u7eed\u76d1\u542c\u4efb\u52a1\u5e76\u963b\u585e\u7b49\u5f85\uff0c\u4f46\u5b83\u672c\u8eab\u4e0d\u80fd\u963b\u585e\u4e3b\u7ebf\u7a0b\uff0c\u6240\u4ee5 `Trigger` \u5185\u90e8\u5fc5\u987b\u6709\u4e00\u4e2a\u72ec\u7acb\u7684\u7ebf\u7a0b\u6765\u8fd0\u884c\u3002<\/p>\n\n\n\n
\u6211\u4eec\u6765\u601d\u8003\u8fd9\u4e2a\u7ebf\u7a0b\u8981\u505a\u4ec0\u4e48\u3002\u9996\u5148\uff0c\u5b83\u9700\u8981\u83b7\u53d6\u6240\u6709\u5f85\u6267\u884c\u7684\u4efb\u52a1\uff0c\u5e76\u4e14\u51c6\u786e\u77e5\u9053\u6bcf\u4e2a\u4efb\u52a1\u7684\u6267\u884c\u65f6\u95f4\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u5c01\u88c5\u4e00\u4e2a\u7c7b\u53eb `Job`\u3002\u8fd9\u4e2a `Job` \u662f\u5bf9\u4efb\u52a1\u7684\u5305\u88c5\uff0c\u5305\u542b\u4e24\u4e2a\u5173\u952e\u4fe1\u606f\uff1a\u4e00\u662f\u771f\u6b63\u7684\u4efb\u52a1\uff08`Runnable task`\uff09\uff0c\u4e8c\u662f\u4efb\u52a1\u7684\u4e0b\u4e00\u6b21\u6267\u884c\u65f6\u95f4\uff08`startTime`\uff09\u3002\u6211\u4eec\u4e3a\u5b83\u63d0\u4f9b getter \u548c setter \u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u5f53 `Trigger` \u63a5\u6536\u5230\u4e00\u4e2a `Job` \u65f6\uff0c\u5b83\u9700\u8981\u5224\u65ad\u5f53\u524d\u65f6\u95f4\u548c `Job` \u7684 `startTime` \u7684\u5173\u7cfb\u3002\u7528 `startTime - System.currentTimeMillis()` \u5f97\u5230\u4e00\u4e2a\u5dee\u503c\uff0c\u79f0\u4e3a `waitTime`\u3002\u5982\u679c `waitTime > 0`\uff0c\u8bf4\u660e\u8fd8\u6ca1\u5230\u6267\u884c\u65f6\u95f4\uff0c\u9700\u8981\u7b49\u5f85\uff1b\u5982\u679c `waitTime <= 0`\uff0c\u8bf4\u660e\u5df2\u7ecf\u5230\u4e86\u6216\u9519\u8fc7\u4e86\u6267\u884c\u65f6\u95f4\uff0c\u5e94\u8be5\u7acb\u5373\u6267\u884c\u4efb\u52a1\u3002<\/p>\n\n\n\n
\u8fd9\u5c31\u662f\u6574\u4e2a `Trigger` \u7684\u57fa\u672c\u601d\u8def\u3002<\/p>\n\n\n\n
public class Job {\n    private Runnable task;\n    private long startTime = now;\n\n    public Runnable getTask() {\n        return task;\n    }\n\n    public Job setTask(Runnable task) {\n        this.task = task;\n        return this;\n    }\n\n    public long getStartTime() {\n        return startTime;\n    }\n\n    public Job setStartTime(long startTime) {\n        this.startTime = startTime;\n    }\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u5177\u4f53\u5b9e\u73b0\u4e0a\uff0c\u8fd9\u4e2a\u7ebf\u7a0b\u4f1a\u4ece\u67d0\u4e2a\u5bb9\u5668\u4e2d\u53d6\u51fa\u4e00\u4e2a `Job`\uff0c\u5224\u65ad\u662f\u5426\u9700\u8981\u7b49\u5f85\uff0c\u5982\u679c\u9700\u8981\u5c31\u7b49\u5f85\u5bf9\u5e94\u65f6\u95f4\uff0c\u7136\u540e\u5c06\u4efb\u52a1\u63d0\u4ea4\u7ed9\u7ebf\u7a0b\u6c60\u6267\u884c\u3002<\/p>\n\n\n\n
\u6211\u4eec\u53ef\u4ee5\u5148\u7b80\u5355\u5199\u4e00\u4e2a\u6b7b\u5faa\u73af\uff1a<\/p>\n\n\n\n
\/\/ \u7b49\u5f85\u5408\u9002\u7684\u65f6\u95f4\uff0c\u628a\u5bf9\u5e94\u7684\u4efb\u52a1\u6254\u5230\u7ebf\u7a0b\u6c60\u4e2d\nclass Trigger{\n    List<Job> jobList = new ArrayList<>();\n\n    Thread thread = new Thread(() -> {\n        while (true) {\n            \/\/ 1 job wait 1s  2 job wait 500ms\n            for (Job job : jobList) {\n                long waitTime = job.getStartTime() - System.currentTimeMillis();\n                if (waitTime > 0) {\n                    Thread.sleep(waitTime);\n                }\n                executorService.execute(job.getTask());\n            }\n        }\n    });\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u4f46\u8fd9\u6bb5\u4ee3\u7801\u5b58\u5728\u4e24\u4e2a\u660e\u663e\u95ee\u9898\uff1a<\/p>\n\n\n\n
\u7b2c\u4e00\uff0c\u5f53 `jobList` \u662f\u7a7a\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u6b7b\u5faa\u73af\u4f1a\u4e0d\u65ad\u8f6e\u8be2\uff0c\u9020\u6210 CPU \u8d44\u6e90\u6d6a\u8d39\u3002<\/p>\n\n\n\n
\u7b2c\u4e8c\uff0c\u5047\u8bbe `jobList` \u4e2d\u6709\u4e24\u4e2a\u4efb\u52a1\uff1a\u4e00\u4e2a\u9700\u8981\u7b49\u5f85 1 \u79d2\uff0c\u53e6\u4e00\u4e2a\u9700\u8981\u7b49\u5f85 500 \u6beb\u79d2\u3002\u5982\u679c\u6211\u4eec\u6309\u987a\u5e8f\u5904\u7406\uff0c\u4ecd\u7136\u4f1a\u5148\u7b49 1 \u79d2\uff0c\u5bfc\u81f4\u7b2c\u4e8c\u4e2a\u4efb\u52a1\u5ef6\u8fdf\u6267\u884c\u3002\u6240\u4ee5\u6211\u4eec\u9700\u8981\u786e\u4fdd\u4efb\u52a1\u662f\u6709\u5e8f\u7684\u2014\u2014\u5148\u6267\u884c\u7684\u4efb\u52a1\u6392\u5728\u524d\u9762\u3002<\/p>\n\n\n\n
\u56e0\u6b64\uff0c\u6211\u4eec\u5fc5\u987b\u5bf9 `Job` \u5b9e\u73b0\u6392\u5e8f\u903b\u8f91\uff0c\u6bd4\u5982\u5b9e\u73b0 `Comparable<Job>` \u63a5\u53e3\uff0c\u6bd4\u8f83\u4f9d\u636e\u5c31\u662f `startTime`\u3002\u6bcf\u6b21\u53d6\u4efb\u52a1\u524d\u5bf9\u5217\u8868\u6392\u5e8f\uff0c\u4ee5\u4fdd\u8bc1\u6700\u5148\u6267\u884c\u7684\u4efb\u52a1\u5728\u6700\u524d\u9762\u3002<\/p>\n\n\n\n
Collections.sort(jobList);<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u4f46\u8fd9\u6837\u505a\u4e5f\u6709\u95ee\u9898\uff1a\u6bcf\u6b21\u6392\u5e8f\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(n log n)\uff0c\u9891\u7e41\u63d2\u5165\u4efb\u52a1\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\uff1b\u800c\u4e14\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u6392\u5e8f\u8fc7\u7a0b\u4e2d\u5982\u679c\u6709\u65b0\u4efb\u52a1\u52a0\u5165\uff0c\u4f1a\u4ea7\u751f\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u3002<\/p>\n\n\n\n
\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e24\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u5c06\u5bb9\u5668\u6362\u6210\u4e00\u4e2a**\u963b\u585e\u5f0f\u7684\u4f18\u5148\u7ea7\u961f\u5217**\uff08`PriorityBlockingQueue`\uff09\u3002\u5982\u679c\u4f60\u4e0d\u719f\u6089\u8fd9\u4e2a\u7c7b\uff0c\u53ef\u4ee5\u67e5\u9605\u76f8\u5173\u6587\u6863\u3002\u4f60\u53ef\u4ee5\u628a\u5b83\u7406\u89e3\u4e3a\u4e00\u4e2a\u81ea\u52a8\u6392\u5e8f\u3001\u7ebf\u7a0b\u5b89\u5168\u3001\u652f\u6301\u963b\u585e\u64cd\u4f5c\u7684\u4f18\u5148\u961f\u5217\u3002<\/p>\n\n\n\n
\u6211\u4eec\u5c06 `jobList` \u66ff\u6362\u4e3a `PriorityBlockingQueue<Job> queue`\u3002\u8fd9\u6837\u6211\u4eec\u4e0d\u9700\u8981\u624b\u52a8\u6392\u5e8f\uff0c\u6bcf\u6b21\u53d6\u51fa\u7684\u4efb\u52a1\u81ea\u7136\u662f\u6700\u5148\u8981\u6267\u884c\u7684\u90a3\u4e2a\u3002<\/p>\n\n\n\n
\u4fee\u6539\u540e\u7684\u903b\u8f91\u5982\u4e0b\uff1a<\/p>\n\n\n\n
class Trigger{\n    PriorityQueue<Job> queue = new PriorityBlockingQueue<>();\n\n    Thread thread = new Thread(() ->{\n        while (true){\n            if(!queue.isEmpty()){\n                Job job = queue.poll();\n                long waitTime = job.getStartTime() - System.currentTimeMillis();\n                if(waitTime > 0){\n                    Thread.sleep(waitTime);\n                }\n                executorService.execute(job.getTask());\n            }\n        }\n    });\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u4f46\u662f\u8fd9\u91cc\u8fd8\u6709\u4e00\u4e2a\u95ee\u9898\uff1a\u5982\u679c\u6211\u4eec\u6b63\u5728\u7b49\u5f85\u4e00\u4e2a 1 \u79d2\u540e\u6267\u884c\u7684\u4efb\u52a1\uff0c\u6b64\u65f6\u7528\u6237\u53c8\u6dfb\u52a0\u4e86\u4e00\u4e2a 500 \u6beb\u79d2\u540e\u6267\u884c\u7684\u4efb\u52a1\uff0c\u539f\u6765\u7684\u7b49\u5f85\u4ecd\u7136\u4f1a\u6301\u7eed 1 \u79d2\uff0c\u65b0\u4efb\u52a1\u65e0\u6cd5\u63d0\u524d\u89e6\u53d1\u3002\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u201c\u5524\u9192\u673a\u5236\u201d\uff0c\u8ba9\u6b63\u5728\u7b49\u5f85\u7684\u7ebf\u7a0b\u80fd\u88ab\u53ca\u65f6\u5524\u9192\uff0c\u91cd\u65b0\u68c0\u67e5\u961f\u5217\u3002<\/p>\n\n\n\n
\u5bf9\u4e8e `Thread.sleep()`\uff0c\u552f\u4e00\u7684\u5524\u9192\u65b9\u5f0f\u662f\u8c03\u7528 `interrupt()`\uff0c\u4f46\u8fd9\u662f JDK \u4e0d\u63a8\u8350\u7684\u505a\u6cd5\uff0c\u8fd8\u9700\u8981\u6355\u83b7 `InterruptedException`\uff0c\u4ee3\u7801\u4e0d\u4f18\u96c5\u3002<\/p>\n\n\n\n
\u6211\u4eec\u6539\u7528 `LockSupport.park()` \u548c `LockSupport.unpark()`\u3002`park()` \u53ef\u4ee5\u963b\u585e\u7ebf\u7a0b\uff0c`unpark(Thread t)` \u53ef\u4ee5\u5524\u9192\u6307\u5b9a\u7ebf\u7a0b\u3002\u6211\u4eec\u53ef\u4ee5\u5728 `Trigger` \u4e2d\u66b4\u9732\u4e00\u4e2a `wakeup()` \u65b9\u6cd5\uff0c\u7528\u4e8e\u5524\u9192\u81ea\u5df1\u3002<\/p>\n\n\n\n
\u4e8e\u662f\u6211\u4eec\u4fee\u6539\u903b\u8f91\uff1a\u6bcf\u5f53\u6dfb\u52a0\u65b0\u4efb\u52a1\u65f6\uff0c\u5c31\u8c03\u7528\u4e00\u6b21 `wakeup()`\uff0c\u786e\u4fdd\u89e6\u53d1\u5668\u80fd\u91cd\u65b0\u68c0\u67e5\u961f\u5217\u3002<\/p>\n\n\n\n
\u4f46\u73b0\u5728\u53c8\u51fa\u73b0\u4e00\u4e2a\u95ee\u9898\uff1a\u5047\u8bbe\u6211\u4eec\u6b63\u5728\u7b49\u5f85 1 \u79d2\uff0c\u8fd9\u65f6\u6dfb\u52a0\u4e86\u4e00\u4e2a 500 \u6beb\u79d2\u7684\u4efb\u52a1\u5e76\u5524\u9192\u4e86\u7ebf\u7a0b\uff0c\u7ebf\u7a0b\u88ab\u5524\u9192\u540e\u7ee7\u7eed\u6267\u884c\uff0c\u4f46\u5b83\u4ecd\u7136\u4f1a\u53bb\u6267\u884c\u90a3\u4e2a 1 \u79d2\u7684\u4efb\u52a1\uff0c\u800c\u4e0d\u662f\u65b0\u7684 500 \u6beb\u79d2\u4efb\u52a1\u3002\u8fd9\u8bf4\u660e\u6211\u4eec\u7684\u903b\u8f91\u6709\u95ee\u9898\u3002<\/p>\n\n\n\n
\u6b63\u786e\u7684\u505a\u6cd5\u662f\uff1a**\u6bcf\u6b21\u88ab\u5524\u9192\u540e\uff0c\u90fd\u5e94\u8be5\u91cd\u65b0\u4ece\u961f\u5217\u4e2d\u83b7\u53d6\u6700\u8fd1\u7684\u4efb\u52a1\uff0c\u91cd\u65b0\u5224\u65ad\u662f\u5426\u9700\u8981\u7b49\u5f85**\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u6211\u4eec\u91cd\u6784\u903b\u8f91\uff1a<\/p>\n\n\n\n
class Trigger{\n    PriorityQueue<Job> queue = new PriorityBlockingQueue<>();\n\n    Thread thread = new Thread(() ->{\n        while (true){\n            if (queue.isEmpty()) {\n                LockSupport.park();\n            }\n            Job latelyJob = queue.peek();\n            if (latelyJob.getStartTime() < System.currentTimeMillis()) {\n                latelyJob = queue.poll();\n                executorService.execute(latelyJob.getTask());\n            }else{\n                LockSupport.parkUntil(latelyJob.getStartTime());\n            }\n        }\n    });\n\n    if(!queue.isEmpty()){\n        \/\/ wait 1s\n        Job job = queue.poll();\n        long waitTime = job.getStartTime() - System.currentTimeMillis();\n        if(waitTime > 0){\n            LockSupport.park(1s);\n        }\n        executorService.execute(job.getTask());\n    }\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u6ce8\u610f\u8fd9\u91cc\u4f7f\u7528\u4e86 `peek()` \u5148\u67e5\u770b\u4efb\u52a1\uff0c\u518d\u51b3\u5b9a\u662f\u5426 `poll()`\u3002\u56e0\u4e3a\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c`peek()` \u8fd4\u56de\u7684\u5bf9\u8c61\u548c `poll()` \u8fd4\u56de\u7684\u5bf9\u8c61\u53ef\u80fd\u4e0d\u662f\u540c\u4e00\u4e2a\u2014\u2014\u6bd4\u5982\u5728 `peek()` \u4e4b\u540e\u3001`poll()` \u4e4b\u524d\uff0c\u53c8\u6709\u66f4\u65e9\u7684\u4efb\u52a1\u88ab\u63d2\u5165\u3002<\/p>\n\n\n\n
\u4f46\u56e0\u4e3a\u662f\u4f18\u5148\u961f\u5217\uff0c\u53ea\u8981\u6211\u4eec\u6bcf\u6b21\u53d6\u201c\u6700\u8fd1\u201d\u7684\u4efb\u52a1\uff0c\u5c31\u80fd\u4fdd\u8bc1\u6b63\u786e\u6027\u3002<\/p>\n\n\n\n
\u6b64\u5916\u8fd8\u6709\u4e00\u4e2a\u91cd\u8981\u95ee\u9898\uff1a**\u865a\u5047\u5524\u9192**\uff08spurious wakeup\uff09\u3002\u5373\u4f7f\u6ca1\u6709\u8c03\u7528 `unpark()`\uff0c`park()` \u4e5f\u53ef\u80fd\u88ab\u968f\u673a\u5524\u9192\u3002\u7c7b\u4f3c `Object.wait()` \u7684\u63a8\u8350\u5199\u6cd5\u662f\u4f7f\u7528 `while` \u800c\u4e0d\u662f `if` \u6765\u5224\u65ad\u6761\u4ef6\u3002\u56e0\u6b64\u6211\u4eec\u4e5f\u5e94\u8be5\u628a `queue.peek()` \u7684\u5224\u65ad\u653e\u5728 `while` \u5faa\u73af\u4e2d\u3002<\/p>\n\n\n\n
\u6700\u7ec8\u4fee\u6b63\u7248\u903b\u8f91\uff1a<\/p>\n\n\n\n
\/\/ \u7b49\u5f85\u5408\u9002\u7684\u65f6\u95f4\uff0c\u628a\u5bf9\u5e94\u7684\u4efb\u52a1\u6254\u5230\u7ebf\u7a0b\u6c60\u4e2d\nclass Trigger{\n    PriorityQueue<Job> queue = new PriorityBlockingQueue<>();\n\n    Thread thread = new Thread(() ->{\n        while (true){\n            while (queue.isEmpty()) {\n                LockSupport.park();\n            }\n            Job latelyJob = queue.peek();\n            if (latelyJob.getStartTime() < System.currentTimeMillis()) {\n                latelyJob = queue.poll();\n                executorService.execute(latelyJob.getTask());\n            }else{\n                LockSupport.parkUntil(latelyJob.getStartTime());\n            }\n        }\n    });\n\n    void wakeUp(){\n        LockSupport.unpark(thread);\n    }\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u8fd9\u6837\u5c31\u89e3\u51b3\u4e86\u7a7a\u961f\u5217\u963b\u585e\u3001\u865a\u5047\u5524\u9192\u3001\u53ca\u65f6\u54cd\u5e94\u65b0\u4efb\u52a1\u7b49\u95ee\u9898\u3002<\/p>\n\n\n\n
\u63a5\u4e0b\u6765\u6211\u4eec\u5b8c\u5584 `schedule` \u65b9\u6cd5\u3002\u6bcf\u6b21\u8c03\u7528 `schedule(task, delay)` \u65f6\uff0c\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2a `Job`\uff0c\u8bbe\u7f6e\u5176 `task` \u548c `startTime`\uff08\u5f53\u524d\u65f6\u95f4 + delay\uff09\uff0c\u7136\u540e\u653e\u5165\u961f\u5217\uff0c\u5e76\u8c03\u7528 `trigger.wakeup()` \u5524\u9192\u89e6\u53d1\u5668\u7ebf\u7a0b\u3002<\/p>\n\n\n\n
void schedule(Runnable task, long delay) {\n    Job job = new Job();\n    job.setTask(task);\n    job.setStartTime(System.currentTimeMillis() + delay);\n    trigger.queue.offer(job);\n    trigger.wakeUp();\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u6ce8\u610f\uff1a`Trigger` \u7684\u7ebf\u7a0b\u5fc5\u987b\u5728\u9996\u6b21\u8c03\u7528 `schedule` \u524d\u542f\u52a8\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u7c7b\u521d\u59cb\u5316\u65f6\u5c31 `new Thread(triggerRunnable).start()`\uff0c\u6216\u8005\u5728\u7b2c\u4e00\u6b21\u6dfb\u52a0\u4efb\u52a1\u65f6\u542f\u52a8\u3002\u4e5f\u53ef\u4ee5\u52a0\u4e00\u53e5\u65e5\u5fd7\uff1a\u201c\u89e6\u53d1\u5668\u5df2\u542f\u52a8\u201d\u3002<\/p>\n\n\n\n
\u73b0\u5728\u8fd8\u6709\u4e00\u4e2a\u95ee\u9898\uff1a\u76ee\u524d\u7684\u4efb\u52a1\u53ea\u6267\u884c\u4e00\u6b21\u3002\u6211\u4eec\u8981\u5b9e\u73b0\u5468\u671f\u6027\u4efb\u52a1\uff0c\u5c31\u5fc5\u987b\u5728\u4efb\u52a1\u6267\u884c\u540e\uff0c\u8ba1\u7b97\u4e0b\u4e00\u6b21\u6267\u884c\u65f6\u95f4\uff0c\u751f\u6210\u65b0\u7684 `Job` \u5e76\u91cd\u65b0\u653e\u5165\u961f\u5217\u3002<\/p>\n\n\n\n
\u4e3a\u6b64\uff0c\u6211\u4eec\u5728 `Job` \u7c7b\u4e2d\u589e\u52a0\u4e00\u4e2a\u5b57\u6bb5\uff1a`delay`\uff0c\u8868\u793a\u4efb\u52a1\u7684\u6267\u884c\u95f4\u9694\u3002\u5728\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 `Job`\uff1a<\/p>\n\n\n\n
\u8fd9\u6837\u5c31\u80fd\u5b9e\u73b0\u65e0\u9650\u5faa\u73af\u7684\u5b9a\u65f6\u4efb\u52a1\u3002<\/p>\n\n\n\n
\/\/ \u7b49\u5f85\u5408\u9002\u7684\u65f6\u95f4\uff0c\u628a\u5bf9\u5e94\u7684\u4efb\u52a1\u6254\u5230\u7ebf\u7a0b\u6c60\u4e2d\nclass Trigger {\n    PriorityQueue<Job> queue = new PriorityBlockingQueue<>();\n\n    Thread thread = new Thread(() -> {\n        while (true) {\n            while (queue.isEmpty()) {\n                LockSupport.park();\n            }\n            Job latelyJob = queue.peek();\n            if (latelyJob.getStartTime() < System.currentTimeMillis()) {\n                latelyJob = queue.poll();\n                executorService.execute(latelyJob.getTask());\n                Job nextJob = new Job();\n                nextJob.setTask(latelyJob.getTask());\n                nextJob.setDelay(latelyJob.getDelay());\n                nextJob.setStartTime(System.currentTimeMillis() + latelyJob.getDelay());\n                queue.offer(nextJob);\n            } else {\n                LockSupport.parkUntil(latelyJob.getStartTime());\n            }\n        }\n    });\n    \n    {\n        thread.start();\n        System.out.println(\"\u89e6\u53d1\u5668\u542f\u52a8\u4e86\");\n    }\n}<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u6211\u4eec\u6d4b\u8bd5\u4e00\u4e0b\uff1a\u4e3b\u51fd\u6570\u4e2d\u5148 schedule \u4e00\u4e2a\u6bcf 100ms \u6253\u5370\u201c1\u201d\u7684\u4efb\u52a1\uff0csleep 1\u79d2\u540e\uff0c\u518d\u6dfb\u52a0\u4e00\u4e2a\u6bcf 200ms \u6253\u5370\u201c2\u201d\u7684\u4efb\u52a1\u3002\u6253\u5370\u5185\u5bb9\u52a0\u4e0a\u65f6\u95f4\u6233\u683c\u5f0f\u5316\u8f93\u51fa\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n
 
System.out.println(LocalDateTime.now().format(DateTimeFormatter.ofPattern(\"HH:mm:ss.SSS\")) + \" - \u8fd9\u662f100ms\u4e00\u6b21\u7684\u4efb\u52a1\");
 <\/p>\n\n\n\n
\u89c2\u5bdf\u8f93\u51fa\uff0c\u867d\u7136\u65f6\u95f4\u95f4\u9694\u7565\u6709\u504f\u5dee\uff08\u53d7\u7ebf\u7a0b\u8c03\u5ea6\u5f71\u54cd\uff09\uff0c\u4f46\u57fa\u672c\u7b26\u5408\u9884\u671f\u3002200ms \u7684\u4efb\u52a1\u4e5f\u5927\u81f4\u6309\u5468\u671f\u6267\u884c\u3002<\/p>\n\n\n\n
\u603b\u7ed3\u4e00\u4e0b\uff0c\u6211\u4eec\u5927\u7ea6\u7528\u4e8670\u884c\u4ee3\u7801\uff08\u53bb\u6389\u7a7a\u884c\u548c\u6ce8\u91ca\u540e\u7ea650\u884c\uff09\uff0c\u5b9e\u73b0\u4e86\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u7684\u5b9a\u65f6\u4efb\u52a1\u8c03\u5ea6\u5668\uff0c\u6838\u5fc3\u601d\u60f3\u662f\uff1a<\/p>\n\n\n\n
- \u4f7f\u7528\u72ec\u7acb\u7684 `Trigger` \u7ebf\u7a0b\u8d1f\u8d23\u8c03\u5ea6\uff1b
- \u4f7f\u7528 `PriorityBlockingQueue` \u7ba1\u7406\u4efb\u52a1\uff0c\u6309\u6267\u884c\u65f6\u95f4\u6392\u5e8f\uff1b
- \u4f7f\u7528 `LockSupport.parkUntil()` \u5b9e\u73b0\u7cbe\u51c6\u963b\u585e\uff1b
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\u6700\u540e\u7559\u4e00\u4e2a\u601d\u8003\u9898\uff1a\u4f60\u80fd\u5b9e\u73b0\u4e00\u4e2a\u53ef\u4ee5\u4e2d\u65ad\u7684 `Job` \u5417\uff1f\u6bd4\u5982\u7528\u6237\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u53d6\u6d88\u67d0\u4e2a\u5b9a\u65f6\u4efb\u52a1\u3002\u53e6\u5916\uff0c\u8bf7\u601d\u8003\uff1aChrome \u4e2d\u7684 `setTimeout` \/ `setInterval` \u548c\u6211\u4eec\u8fd9\u79cd\u57fa\u4e8e\u7ebf\u7a0b\u6c60+\u4f18\u5148\u961f\u5217\u7684\u5b9a\u65f6\u4efb\u52a1\u5b9e\u73b0\u6709\u4ec0\u4e48\u533a\u522b\uff1f \u200b<\/p>\n\n\n\n
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