{"id":1331,"date":"2023-05-28T10:20:14","date_gmt":"2023-05-28T02:20:14","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=1331"},"modified":"2023-05-28T10:20:14","modified_gmt":"2023-05-28T02:20:14","slug":"%e9%9d%a2%e8%af%95%e5%ae%98-%e7%ba%bf%e7%a8%8b%e6%b1%a0%e6%98%af%e5%a6%82%e4%bd%95%e5%81%9a%e5%88%b0%e7%ba%bf%e7%a8%8b%e5%a4%8d%e7%94%a8%e7%9a%84%ef%bc%9f%e6%9c%89%e4%ba%86%e8%a7%a3%e8%bf%87%e5%90%97","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/java\/%e9%9d%a2%e8%af%95%e5%ae%98-%e7%ba%bf%e7%a8%8b%e6%b1%a0%e6%98%af%e5%a6%82%e4%bd%95%e5%81%9a%e5%88%b0%e7%ba%bf%e7%a8%8b%e5%a4%8d%e7%94%a8%e7%9a%84%ef%bc%9f%e6%9c%89%e4%ba%86%e8%a7%a3%e8%bf%87%e5%90%97\/","title":{"rendered":"\u9762\u8bd5\u5b98: \u7ebf\u7a0b\u6c60\u662f\u5982\u4f55\u505a\u5230\u7ebf\u7a0b\u590d\u7528\u7684\uff1f\u6709\u4e86\u89e3\u8fc7\u5417\uff0c\u8bf4\u8bf4\u770b"},"content":{"rendered":"
\n
\n

\u9762\u8bd5\u5b98: \u7ebf\u7a0b\u6c60\u662f\u5982\u4f55\u505a\u5230\u7ebf\u7a0b\u590d\u7528\u7684\uff1f\u6709\u4e86\u89e3\u8fc7\u5417\uff0c\u8bf4\u8bf4\u770b<\/span><\/h1>\n

\u524d\u8a00<\/span><\/h2>\n

\u76ee\u524d\u6b63\u5728\u51fa\u4e00\u4e2aJava\u591a\u7ebf\u7a0b\u4e13\u9898<\/code>\u957f\u671f\u7cfb\u5217\u6559\u7a0b\uff0c\u4ece\u5165\u95e8\u5230\u8fdb\u9636\u542b\u6e90\u7801\u89e3\u8bfb<\/code>, \u7bc7\u5e45\u4f1a\u8f83\u591a, \u559c\u6b22\u7684\u8bdd\uff0c\u7ed9\u4e2a\u5173\u6ce8\u2764\ufe0f ~<\/p>\n

<\/section>\n

\u627f\u63a5\u4e0a\u8282\u7684\u95ee\u9898\uff0c\u6211\u4eec\u7ee7\u7eed\u63a2\u8ba8ThreadPoolExecutor<\/code>,\u4e00\u8d77\u6765\u770b\u4e0b\u5427~<\/p>\n

ThreadPoolExecutor\u4e2d\u662f\u5982\u4f55\u505a\u5230\u7ebf\u7a0b\u590d\u7528\u7684\u2753<\/span><\/h2>\n

\u6211\u4eec\u77e5\u9053\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u5728\u521b\u5efa\u7684\u65f6\u5019\u4f1a\u6307\u5b9a\u4e00\u4e2a\u7ebf\u7a0b\u4efb\u52a1\uff0c\u5f53\u6267\u884c\u5b8c\u8fd9\u4e2a\u7ebf\u7a0b\u4efb\u52a1\u4e4b\u540e\uff0c\u7ebf\u7a0b\u81ea\u52a8\u9500\u6bc1\u3002\u4f46\u662f\u7ebf\u7a0b\u6c60\u5374\u53ef\u4ee5\u590d\u7528\u7ebf\u7a0b\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u5b8c\u7ebf\u7a0b\u4efb\u52a1\u540e\u4e0d\u9500\u6bc1\uff0c\u7ee7\u7eed\u6267\u884c\u53e6\u5916\u7684\u7ebf\u7a0b\u4efb\u52a1\u3002\u90a3\u4e48\u5b83\u662f\u5982\u4f55\u505a\u5230\u7684\u2753\u8fd9\u5f97\u4eceaddWorker()<\/code>\u8bf4\u8d77<\/p>\n

addWorker()<\/span><\/h3>\n
    \n
  • \n
    \u5148\u770b\u4e0a\u534a\u90e8\u5206addWorker()<\/code><\/section>\n<\/li>\n<\/ul>\n
    private<\/span>\u00a0Runnable\u00a0getTask<\/span>()<\/span>\u00a0<\/span>{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0boolean<\/span>\u00a0timedOut\u00a0=\u00a0false<\/span>;\u00a0\/\/\u00a0Did\u00a0the\u00a0last\u00a0poll()\u00a0time\u00a0out?<\/span>\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0for<\/span>\u00a0(;;)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int<\/span>\u00a0c\u00a0=\u00a0ctl.get();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int<\/span>\u00a0rs\u00a0=\u00a0runStateOf(c);\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0Check\u00a0if\u00a0queue\u00a0empty\u00a0only\u00a0if\u00a0necessary.<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if<\/span>\u00a0(rs\u00a0>=\u00a0SHUTDOWN\u00a0&&\u00a0(rs\u00a0>=\u00a0STOP\u00a0||\u00a0workQueue.isEmpty()))\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0decrementWorkerCount();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0null<\/span>;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int<\/span>\u00a0wc\u00a0=\u00a0workerCountOf(c);\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0boolean<\/span>\u00a0timed\u00a0=\u00a0allowCoreThreadTimeOut\u00a0||\u00a0wc\u00a0>\u00a0corePoolSize;\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u5982\u679c\u8fd0\u884c\u7ebf\u7a0b\u6570\u8d85\u8fc7\u4e86\u6700\u5927\u7ebf\u7a0b\u6570\uff0c\u4f46\u662f\u7f13\u5b58\u961f\u5217\u5df2\u7ecf\u7a7a\u4e86\uff0c\u8fd9\u65f6\u9012\u51cfworker\u6570\u91cf\u3002<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u5982\u679c\u6709\u8bbe\u7f6e\u5141\u8bb8\u7ebf\u7a0b\u8d85\u65f6\u6216\u8005\u7ebf\u7a0b\u6570\u91cf\u8d85\u8fc7\u4e86\u6838\u5fc3\u7ebf\u7a0b\u6570\u91cf\uff0c\u5e76\u4e14\u7ebf\u7a0b\u5728\u89c4\u5b9a\u65f6\u95f4\u5185\u5747\u672apoll\u5230\u4efb\u52a1\u4e14\u961f\u5217\u4e3a\u7a7a\u5219\u9012\u51cfworker\u6570\u91cf<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if<\/span>\u00a0((wc\u00a0>\u00a0maximumPoolSize\u00a0||\u00a0(timed\u00a0&&\u00a0timedOut))\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0&&\u00a0(wc\u00a0>\u00a01<\/span>\u00a0||\u00a0workQueue.isEmpty()))\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if<\/span>\u00a0(compareAndDecrementWorkerCount(c))\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0null<\/span>;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0continue<\/span>;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0try<\/span>\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u5982\u679ctimed\u4e3atrue,\u5219\u4f1a\u8c03\u7528workQueue\u7684poll\u65b9\u6cd5\u83b7\u53d6\u4efb\u52a1.<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u8d85\u65f6\u65f6\u95f4\u662fkeepAliveTime\u3002\u5982\u679c\u8d85\u8fc7keepAliveTime\u65f6\u957f\uff0c<\/span>\n\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u5982\u679ctimed\u4e3afalse, \u5219\u4f1a\u8c03\u7528workQueue\u7684take\u65b9\u6cd5\u963b\u585e\u5728\u5f53\u524d\u3002<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u961f\u5217\u4e2d\u6709\u4efb\u52a1\u52a0\u5165\u65f6\uff0c\u7ebf\u7a0b\u88ab\u5524\u9192\uff0ctake\u65b9\u6cd5\u8fd4\u56de\u4efb\u52a1\uff0c\u5e76\u6267\u884c\u3002<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Runnable\u00a0r\u00a0=\u00a0timed\u00a0?\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0workQueue.poll(keepAliveTime,\u00a0TimeUnit.NANOSECONDS)\u00a0:\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0workQueue.take();\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if<\/span>\u00a0(r\u00a0!=\u00a0null<\/span>)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0r;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0timedOut\u00a0=\u00a0true<\/span>;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0catch<\/span>\u00a0(InterruptedException\u00a0retry)\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0timedOut\u00a0=\u00a0false<\/span>;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0}\n<\/code><\/pre>\n
    \u5927\u5bb6\u6709\u6ca1\u6709\u60f3\u8fc7\u8fd9\u91cc\u4e3a\u5565\u8981\u7528take<\/code>\u548cpoll<\/code>,\u5b83\u4eec\u90fd\u662f\u51fa\u961f\u7684\u64cd\u4f5c\uff0c\u8fd9\u4e48\u505a\u6709\u4ec0\u4e48\u597d\u5904?<\/p>\n
    take & poll<\/span><\/h3>\n
    \u6211\u4eec\u8bf4take()<\/code>\u65b9\u6cd5\u4f1a\u5c06\u6838\u5fc3\u7ebf\u7a0b\u963b\u585e\u6302\u8d77\uff0c\u8fd9\u6837\u4e00\u6765\u5b83\u5c31\u4e0d\u4f1a\u5360\u7528\u592a\u591a\u7684cpu\u8d44\u6e90,\u76f4\u5230\u62ff\u5230Runnable<\/code> \u7136\u540e\u8fd4\u56de\u3002<\/p>\n
    \u5982\u679c\u300callowCoreThreadTimeOut\u300d<\/strong>\u8bbe\u7f6e\u4e3atrue<\/code>,\u90a3\u4e48\u6838\u5fc3\u7ebf\u7a0b\u5c31\u4f1a\u53bb\u8c03\u7528poll<\/code>\u65b9\u6cd5\uff0c\u56e0\u4e3apoll<\/code>\u53ef\u80fd\u4f1a\u8fd4\u56denull<\/code>,\u6240\u4ee5\u8fd9\u65f6\u5019\u6838\u5fc3\u7ebf\u7a0b\u6ee1\u8db3\u8d85\u65f6\u6761\u4ef6\u4e5f\u4f1a\u88ab\u9500\u6bc1<\/p>\n
    \u975e\u6838\u5fc3\u7ebf\u7a0b\u4f1aworkQueue.poll(keepAliveTime, TimeUnit.NANOSECONDS)\uff0c\u5982\u679c\u8d85\u65f6\u8fd8\u6ca1\u6709\u62ff\u5230\uff0c\u4e0b\u4e00\u6b21\u5faa\u73af\u5224\u65ad\u300ccompareAndDecrementWorkerCount\u300d<\/strong>\u5c31\u4f1a\u8fd4\u56denull<\/code>,Worker\u5bf9\u8c61\u7684run()<\/code>\u65b9\u6cd5\u5faa\u73af\u4f53\u7684\u5224\u65ad\u4e3anull<\/code>,\u4efb\u52a1\u7ed3\u675f\uff0c\u7136\u540e\u7ebf\u7a0b\u88ab\u7cfb\u7edf\u56de\u6536 \u3002<\/p>\n
    \u518d\u56de\u5934\u770b\u4e00\u4e0brunWorker()<\/code>\u662f\u4e0d\u662f\u8bbe\u8ba1\u7684\u5f88\u5de7\u5999~<\/p>\n
    \u7ed3\u675f\u8bed<\/span><\/h2>\n
    \u672c\u8282\u5185\u5bb9\u4e0d\u662f\u5f88\u597d\u7406\u89e3\uff0c\u60f3\u7ee7\u7eed\u63a2\u8ba8\u7684\u540c\u5b66\u53ef\u4ee5\u7ee7\u7eed\u9605\u8bfb\u5b83\u7684\u6e90\u7801\uff0c\u8fd9\u90e8\u5206\u5185\u5bb9\u4e86\u89e3\u4e00\u4e0b\u5c31\u597d\uff0c\u5176\u5b9e\u6211\u4eec\u4ece\u6e90\u7801\u4e2d\u53ef\u4ee5\u770b\u5230\u5927\u91cf\u7684\u7ebf\u7a0b\u72b6\u6001\u68c0\u67e5\uff0c\u4ee3\u7801\u5199\u7684\u5f88\u5065\u58ee<\/code>,\u53ef\u4ee5\u4ece\u4e2d\u5b66\u4e60\u4e00\u4e0b\u3002\u4e0b\u4e00\u8282, \u5e26\u5927\u5bb6\u5b66\u4e60\u4e00\u4e0b\u963b\u585e\u961f\u5217BlockingQueue<\/code> ~<\/p>\n<\/section>\n
    \u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8e\u5fae\u4fe1\u516c\u4f17\u53f7: \u7a0b\u5e8f\u5458\u76ae\u5361\u79cb<\/p><\/blockquote>\n<\/div>\n","raw":"","protected":false},"excerpt":{"rendered":"
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