{"id":3675,"date":"2025-04-26T19:42:38","date_gmt":"2025-04-26T11:42:38","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3675"},"modified":"2025-04-26T19:42:38","modified_gmt":"2025-04-26T11:42:38","slug":"%e7%ba%bf%e7%a8%8b%e6%b1%a0%e5%ae%9e%e6%88%98%e7%bb%8f%e9%aa%8c","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/04\/26\/%e7%ba%bf%e7%a8%8b%e6%b1%a0%e5%ae%9e%e6%88%98%e7%bb%8f%e9%aa%8c\/","title":{"rendered":"\u7ebf\u7a0b\u6c60\u5b9e\u6218\u7ecf\u9a8c"},"content":{"rendered":"\n

\u672c\u7ae0\u8282\u6574\u7406\u4e00\u7248\u7ebf\u7a0b\u6c60\u5b9e\u6218\u7ecf\u9a8c<\/strong>\uff0c\u8fd9\u90e8\u5206\u975e\u5e38\u8d34\u8fd1\u9762\u8bd5\u5b98\u7231\u8003<\/strong>\u3001\u73b0\u573a\u5de5\u4f5c\u7231\u7528<\/strong>\u7684\u5185\u5bb9\uff0c\u4f9b\u5927\u5bb6\u53c2\u8003\uff01<\/p>\n\n\n\n

\n\n\n\n

1. \u5982\u4f55\u81ea\u5b9a\u4e49 ThreadFactory\uff1f\u8981\u6ce8\u610f\u4ec0\u4e48\uff1f<\/h2>\n\n\n\n

\u6807\u51c6\u56de\u7b54\uff1a<\/strong><\/p>\n\n\n\n

    \n
  • \u81ea\u5b9a\u4e49 ThreadFactory<\/code>\uff0c\u901a\u5e38\u662f\u4e3a\u4e86\uff1a<\/li>\n\n\n\n
  • \u7ed9\u7ebf\u7a0b\u547d\u540d<\/strong>\uff0c\u4fbf\u4e8e\u65e5\u5fd7\u6392\u67e5\u3001\u76d1\u63a7\u3002<\/li>\n\n\n\n
  • \u8bbe\u7f6e\u662f\u5426\u662f\u5b88\u62a4\u7ebf\u7a0b<\/strong>\uff08Daemon\uff09\u3002<\/li>\n\n\n\n
  • \u8bbe\u7f6e\u7ebf\u7a0b\u4f18\u5148\u7ea7<\/strong>\uff0c\u5fc5\u8981\u65f6\u4f7f\u7528\u3002<\/li>\n<\/ul>\n\n\n\n

    \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n\n\n\n

    ThreadFactory customThreadFactory = runnable -> {\n    Thread thread = new Thread(runnable);\n    thread.setName(\"my-pool-thread-\" + thread.getId());\n    thread.setDaemon(false); \/\/ \u751f\u4ea7\u4e00\u822c\u8bbe\u7f6e\u4e3a\u975e\u5b88\u62a4\u7ebf\u7a0b\n    return thread;\n};<\/code><\/pre>\n\n\n\n
    \u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n\n\n\n
      \n
    • \u4fdd\u8bc1\u7ebf\u7a0b\u521b\u5efa\u903b\u8f91\u7b80\u5355\u3001\u7a33\u5b9a\uff0c\u4e0d\u80fd\u6709\u526f\u4f5c\u7528\u3002<\/li>\n\n\n\n
    • \u547d\u540d\u7edf\u4e00\u89c4\u8303\uff0c\u4fbf\u4e8e\u6392\u67e5\u95ee\u9898\u3002<\/li>\n\n\n\n
    • \u907f\u514d\u7ebf\u7a0b\u521b\u5efa\u8fc7\u591a\u5bfc\u81f4\u8d44\u6e90\u8017\u5c3d\u3002<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n
      2. \u5982\u4f55\u907f\u514d\u7ebf\u7a0b\u6c60\u4e2d\u7684\u5185\u5b58\u6cc4\u6f0f\u95ee\u9898\uff1f<\/h2>\n\n\n\n
      \u6807\u51c6\u56de\u7b54\uff1a<\/strong><\/p>\n\n\n\n
        \n
      • \u6839\u672c\u539f\u56e0<\/strong>\uff1a\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60\u7684\u4efb\u52a1\u5bf9\u8c61\u6301\u6709\u5927\u5bf9\u8c61\u5f15\u7528\uff0c\u5bfc\u81f4\u4efb\u52a1\u5373\u4f7f\u5b8c\u6210\u4e5f\u4e0d\u80fd\u88ab GC\u3002<\/li>\n\n\n\n
      • \u5e38\u89c1\u573a\u666f<\/strong>\uff1a\u533f\u540d\u5185\u90e8\u7c7b\u3001Lambda \u6355\u83b7\u5916\u90e8\u5927\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n\n\n\n
        \u89e3\u51b3\u65b9\u6cd5\uff1a<\/strong><\/p>\n\n\n\n
          \n
        • \u4e0d\u8981\u5728\u4efb\u52a1\u4e2d\u4e0d\u5c0f\u5fc3\u5f15\u7528\u5916\u90e8\u5927\u5bf9\u8c61<\/strong>\u3002<\/li>\n\n\n\n
        • \u7528\u9759\u6001\u5185\u90e8\u7c7b\u4ee3\u66ff\u975e\u9759\u6001\u5185\u90e8\u7c7b\uff0c\u51cf\u5c11\u5bf9\u5916\u90e8\u5f15\u7528\u7684\u9690\u5f0f\u6301\u6709\u3002<\/li>\n\n\n\n
        • \u5b9a\u65f6\u6e05\u7406\u8fc7\u671f\u4efb\u52a1\uff0c\u6216\u8005\u4f7f\u7528\u5408\u7406\u7684\u751f\u547d\u5468\u671f\u7ba1\u7406\u3002<\/li>\n<\/ul>\n\n\n\n
          \u4e3e\u4e2a\u5751\u4f8b\u5b50\uff1a<\/strong><\/p>\n\n\n\n
          BigObject bigObject = new BigObject();\nexecutor.submit(() -> {\n    \/\/ \u9519\u8bef\uff01\u8fd9\u91cc Lambda \u6355\u83b7\u4e86 bigObject\n    bigObject.doSomething();\n});<\/code><\/pre>\n\n\n\n
          \u5e94\u8be5\u6539\u6210\uff1a<\/strong><\/p>\n\n\n\n
          executor.submit(new BigObjectTask(bigObject));<\/code><\/pre>\n\n\n\n
          \n\n\n\n
          3. \u4e0d\u540c\u4e1a\u52a1\u573a\u666f\uff0c\u7ebf\u7a0b\u6c60\u53c2\u6570\u5e94\u8be5\u600e\u4e48\u914d\uff1f<\/h2>\n\n\n\n
          \u6807\u51c6\u56de\u7b54\uff1a<\/strong><\/p>\n\n\n\n
          \u4e1a\u52a1\u7c7b\u578b<\/th>corePoolSize \/ maximumPoolSize<\/th>\u961f\u5217\u7c7b\u578b<\/th>\u7279\u70b9<\/th><\/tr><\/thead>
          CPU\u5bc6\u96c6\u578b\uff08\u8ba1\u7b97\u3001\u52a0\u5bc6\uff09<\/td>\u6838\u5fc3\u7ebf\u7a0b\u6570 = CPU\u6838\u6570\uff08n\uff09\u6216 n+1<\/td>SynchronousQueue \u6216 ArrayBlockingQueue<\/td>\u4fdd\u8bc1 CPU \u4e0d\u5207\u6362\u4e0a\u4e0b\u6587<\/td><\/tr>
          IO\u5bc6\u96c6\u578b\uff08\u6570\u636e\u5e93\u3001\u6587\u4ef6\uff09<\/td>\u6838\u5fc3\u7ebf\u7a0b\u6570 = 2n ~ 4n<\/td>LinkedBlockingQueue<\/td>\u907f\u514d IO \u963b\u585e\u5bfc\u81f4 CPU \u7a7a\u95f2<\/td><\/tr>
          \u9ad8\u5e76\u53d1\u4f4e\u5ef6\u8fdf\u7cfb\u7edf<\/td>\u6838\u5fc3\u7ebf\u7a0b\u6570 = 2n\uff0c\u6700\u5927\u7ebf\u7a0b\u6570\u5f88\u5927<\/td>SynchronousQueue<\/td>\u54cd\u5e94\u5feb\uff0c\u727a\u7272\u4e00\u4e9b\u8d44\u6e90\u6d88\u8017<\/td><\/tr>
          \u666e\u901a\u540e\u53f0\u5904\u7406<\/td>\u6838\u5fc3\u5c0f\uff08\u59822-4\uff09\uff0c\u6700\u5927\u9002\u4e2d\uff08\u59828-16\uff09<\/td>LinkedBlockingQueue<\/td>\u4fdd\u6301\u7cfb\u7edf\u7a33\u5b9a\u6027\u4f18\u5148<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
          \u603b\u7ed3\u4e00\u53e5\u8bdd<\/strong>\uff1a<\/p>\n\n\n\n
          \n
          \u201cCPU \u5bc6\u96c6\u9650\u6570\u91cf\uff0cIO \u5bc6\u96c6\u653e\u5bbd\uff0c\u5ef6\u8fdf\u654f\u611f\u5feb\u6269\u5bb9\u3002\u201d<\/p>\n<\/blockquote>\n\n\n\n
          \n\n\n\n
          4. \u5982\u4f55\u5408\u7406\u8bbe\u7f6e keepAliveTime\uff1f<\/h2>\n\n\n\n
          \u6807\u51c6\u56de\u7b54\uff1a<\/strong><\/p>\n\n\n\n
            \n
          • \u5982\u679c\u7ebf\u7a0b\u6269\u5c55\u4e3b\u8981\u7528\u4e8e\u77ed\u65f6\u6d41\u91cf\u9ad8\u5cf0<\/strong>\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u8f83\u5c0f\u7684 keepAliveTime\uff0c\u6bd4\u5982 30 \u79d2<\/strong>\u300160 \u79d2<\/strong>\u3002<\/li>\n\n\n\n
          • \u5982\u679c\u5e0c\u671b\u7ebf\u7a0b\u5b58\u6d3b\u65f6\u95f4\u957f\u4e00\u70b9\uff08\u51cf\u5c11\u9891\u7e41\u9500\u6bc1\u5e26\u6765\u7684\u5f00\u9500\uff09\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u5927\u4e00\u70b9\uff0c\u6bd4\u5982 5 \u5206\u949f<\/strong>\u3002<\/li>\n\n\n\n
          • \u5bf9\u6838\u5fc3\u7ebf\u7a0b\u8c03\u7528 allowCoreThreadTimeOut(true)<\/code> \u65f6\uff0c\u8981\u7279\u522b\u5c0f\u5fc3\uff0c\u9632\u6b62\u7ebf\u7a0b\u6c60\u6536\u5149\uff0c\u5bfc\u81f4\u7ebf\u7a0b\u6c60\u9891\u7e41\u521b\u5efa\u65b0\u7ebf\u7a0b \u2794 \u53cd\u800c\u66f4\u6162\u3002<\/li>\n<\/ul>\n\n\n\n
            \u7ecf\u9a8c\u503c<\/strong>\uff1a<\/p>\n\n\n\n
            \n
            \u4e00\u822c keepAliveTime = 1\u5206\u949f\u4ee5\u5185\u5c31\u591f\u7528\uff0c\u7279\u4f8b\u9664\u5916\u3002<\/p>\n<\/blockquote>\n\n\n\n
            \n\n\n\n
            5. \u7ebf\u7a0b\u6c60\u8c03\u4f18\u65f6\u6709\u54ea\u4e9b\u76d1\u63a7\u6307\u6807\u5fc5\u987b\u76ef\u4f4f\uff1f<\/h2>\n\n\n\n
            \u6807\u51c6\u56de\u7b54\uff1a<\/strong><\/p>\n\n\n\n
            \u5173\u952e\u6307\u6807\uff1a<\/p>\n\n\n\n
            \u6307\u6807<\/th>\u8bf4\u660e<\/th>\u91cd\u70b9<\/th><\/tr><\/thead>
            activeCount<\/td>\u6b63\u5728\u8fd0\u884c\u7684\u7ebf\u7a0b\u6570<\/td>\u8fc7\u9ad8\u8bf4\u660e\u7ebf\u7a0b\u5fd9\u4e0d\u8fc7\u6765<\/td><\/tr>
            queueSize<\/td>\u961f\u5217\u4e2d\u7b49\u5f85\u7684\u4efb\u52a1\u6570<\/td>\u6301\u7eed\u4e0a\u5347\u8bf4\u660e\u5904\u7406\u4e0d\u8fc7\u6765<\/td><\/tr>
            completedTaskCount<\/td>\u5df2\u5b8c\u6210\u4efb\u52a1\u6570<\/td>\u53cd\u6620\u5904\u7406\u80fd\u529b<\/td><\/tr>
            largestPoolSize<\/td>\u66fe\u7ecf\u8fbe\u5230\u7684\u6700\u5927\u7ebf\u7a0b\u6570<\/td>\u8bc4\u4f30\u914d\u7f6e\u662f\u5426\u5408\u7406<\/td><\/tr>
            rejectionCount<\/td>\u88ab\u62d2\u7edd\u7684\u4efb\u52a1\u6570\u91cf<\/td>\u76d1\u63a7\u4e1a\u52a1\u5f02\u5e38\u98ce\u9669<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
            \u7ed3\u8bba<\/strong>\uff1a<\/p>\n\n\n\n
            \n
            \u76d1\u63a7 \u2794 \u8c03\u6574\u53c2\u6570 \u2794 \u9632\u6b62\u6392\u961f\u5806\u79ef \u2794 \u4fdd\u8bc1\u7cfb\u7edf\u7a33\u5b9a\u3002<\/p>\n<\/blockquote>\n\n\n\n
            \n\n\n\n
            6. \u5927\u91cf\u77ed\u4efb\u52a1\u9002\u5408\u600e\u6837\u7684\u7ebf\u7a0b\u6c60\u8bbe\u8ba1\uff1f<\/h2>\n\n\n\n
            \u6807\u51c6\u56de\u7b54\uff1a<\/strong><\/p>\n\n\n\n
              \n
            • \u5982\u679c\u4efb\u52a1\u5f88\u77ed\uff08\u6bd4\u5982\u51e0\u5341\u6beb\u79d2\u5185\u5b8c\u6210\uff09\uff0c\u5e94\u8be5\uff1a<\/li>\n\n\n\n
            • \u8bbe\u7f6e\u8f83\u5927\u7684\u6838\u5fc3\u7ebf\u7a0b\u6570\uff0c\u907f\u514d\u9891\u7e41\u63d0\u4ea4\u3001\u6392\u961f\u3002<\/li>\n\n\n\n
            • \u4f7f\u7528\u8f83\u5c0f\u6216\u8005\u540c\u6b65\u578b\u7684\u961f\u5217\uff08\u5982 SynchronousQueue<\/code>\uff09\u3002<\/li>\n\n\n\n
            • \u4fdd\u8bc1 CPU \u5c3d\u91cf\u4fdd\u6301\u5fd9\u788c\uff0c\u800c\u4e0d\u662f\u9891\u7e41\u5207\u6362\u4e0a\u4e0b\u6587\u3002<\/li>\n<\/ul>\n\n\n\n
              \u9009\u578b\u63a8\u8350<\/strong>\uff1a<\/p>\n\n\n\n
              \n
              ThreadPoolExecutor + SynchronousQueue<\/code>\uff0c\u914d\u5408\u5408\u7406\u7684\u6700\u5927\u7ebf\u7a0b\u6570\uff0c\u6700\u9002\u5408\u5904\u7406\u9ad8\u9891\u77ed\u4efb\u52a1\u3002<\/p>\n<\/blockquote>\n\n\n\n
              \n\n\n\n
              7. \u5982\u4f55\u9632\u6b62\u7ebf\u7a0b\u6c60\u4e2d\u7684\u4efb\u52a1\u201c\u5361\u6b7b\u201d\uff1f<\/h2>\n\n\n\n
              \u6807\u51c6\u56de\u7b54\uff1a<\/strong><\/p>\n\n\n\n
                \n
              • \u7ed9\u4efb\u52a1\u8bbe\u7f6e\u8d85\u65f6\uff0c\u6bd4\u5982\u901a\u8fc7 Future.get(timeout, TimeUnit)<\/code> \u6765\u9650\u65f6\u62ff\u7ed3\u679c\u3002<\/li>\n\n\n\n
              • \u5728\u7ebf\u7a0b\u6c60\u5916\u63a7\u5236\u6bcf\u4e2a\u4efb\u52a1\u7684\u6700\u5927\u6267\u884c\u65f6\u95f4\u3002<\/li>\n\n\n\n
              • \u63d0\u4ea4\u53ef\u53d6\u6d88\u7684\u4efb\u52a1\uff08\u6bd4\u5982\u7528 Callable<\/code> \u800c\u4e0d\u662f Runnable<\/code>\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
                \u4f8b\u5b50\uff1a<\/strong><\/p>\n\n\n\n
                Future<?> future = executor.submit(task);\ntry {\n    future.get(5, TimeUnit.SECONDS); \/\/ \u6700\u591a\u7b495\u79d2\n} catch (TimeoutException e) {\n    future.cancel(true); \/\/ \u8d85\u65f6\u540e\u53d6\u6d88\u4efb\u52a1\n}<\/code><\/pre>\n\n\n\n
                \u7ed3\u8bba<\/strong>\uff1a<\/p>\n\n\n\n
                \n
                \u4e0d\u4fe1\u4efb\u4efb\u4f55\u4efb\u52a1\u80fd\u5feb\u901f\u5b8c\u6210\uff0c\u8981\u81ea\u5df1\u515c\u5e95\u3002<\/p>\n<\/blockquote>\n\n\n\n
                \n\n\n\n
                \u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
                \u672c\u7ae0\u8282\u6574\u7406\u4e00\u7248\u7ebf\u7a0b\u6c60\u5b9e\u6218\u7ecf\u9a8c\uff0c\u8fd9\u90e8\u5206\u975e\u5e38\u8d34\u8fd1\u9762\u8bd5\u5b98\u7231\u8003\u3001\u73b0\u573a\u5de5\u4f5c\u7231\u7528\u7684\u5185\u5bb9\uff0c\u4f9b\u5927\u5bb6\u53c2\u8003\uff01 1. \u5982\u4f55\u81ea\u5b9a\u4e49 T […]<\/p>\n","protected":false},"author":1,"featured_media":3676,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-3675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3675","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3675"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3675\/revisions"}],"predecessor-version":[{"id":3677,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3675\/revisions\/3677"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3676"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3675"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3675"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}