{"id":845,"date":"2020-08-18T19:39:34","date_gmt":"2020-08-18T11:39:34","guid":{"rendered":"http:\/\/prayerlaputa.com\/?p=845"},"modified":"2020-08-18T19:39:34","modified_gmt":"2020-08-18T11:39:34","slug":"tomcat%e5%92%8cdubbo%e5%af%b9%e4%ba%8ejdk%e7%ba%bf%e7%a8%8b%e6%b1%a0%e7%9a%84%e4%bf%ae%e6%94%b9","status":"publish","type":"post","link":"http:\/\/prayerlaputa.com\/?p=845","title":{"rendered":"tomcat\u548cdubbo\u5bf9\u4e8eJDK\u7ebf\u7a0b\u6c60\u7684\u4fee\u6539"},"content":{"rendered":"<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u9884\u5907\u77e5\u8bc6<\/span><\/h2>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u8ba1\u7b97\u4efb\u52a1\u7684\u5206\u7c7b<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">CPU\u5bc6\u96c6\u578b\uff1a\u9700\u8981\u7ebf\u7a0b\u957f\u65f6\u95f4\u8fdb\u884c\u7684\u590d\u6742\u7684\u8fd0\u7b97\uff0c\u8fd9\u79cd\u7c7b\u578b\u7684\u4efb\u52a1\u9700\u8981\u5c11\u521b\u5efa\u7ebf\u7a0b\uff0c\u8fc7\u591a\u7684\u7ebf\u7a0b\u5c06\u4f1a\u9891\u7e41\u5f15\u8d77\u4e0a\u6587\u5207\u6362\uff0c\u964d\u4f4e\u4efb\u52a1\u5904\u7406\u5904\u7406\u901f\u5ea6\u3002<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">IO\u5bc6\u96c6\u578b\uff1a\u7531\u4e8e\u7ebf\u7a0b\u5e76\u4e0d\u662f\u4e00\u76f4\u5728\u8fd0\u884c\uff0c\u53ef\u80fd\u5927\u90e8\u5206\u65f6\u95f4\u5728\u7b49\u5f85 IO \u8bfb\u53d6\/\u5199\u5165\u6570\u636e\uff0c\u589e\u52a0\u7ebf\u7a0b\u6570\u91cf\u53ef\u4ee5\u63d0\u9ad8\u5e76\u53d1\u5ea6\uff0c\u5c3d\u53ef\u80fd\u591a\u5904\u7406\u4efb\u52a1\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">JDK\u7ebf\u7a0b\u6c60\uff0c<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>java.util.concurrent.ThreadPoolExecutor<\/code><\/span><span class=\"md-plain\"> \u4f20\u8bf4\u4e2d\u76847\u4e2a\u53c2\u6570\uff0c\u4f5c\u7528\uff0c\u7ebf\u7a0b\u6c60\u8fd0\u884c\u673a\u5236\uff0c\u53c2\u89c1\u4e0b\u56fe\u590d\u4e60<\/span><\/p>\n<p class=\"md-end-block md-p\"><img loading=\"lazy\" class=\" wp-image-846 aligncenter\" src=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/08\/Java\u7ebf\u7a0b\u6c60\u8fd0\u884c\u673a\u5236-300x78.jpg\" alt=\"\" width=\"412\" height=\"107\" srcset=\"http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/08\/Java\u7ebf\u7a0b\u6c60\u8fd0\u884c\u673a\u5236-300x78.jpg 300w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/08\/Java\u7ebf\u7a0b\u6c60\u8fd0\u884c\u673a\u5236-1024x267.jpg 1024w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/08\/Java\u7ebf\u7a0b\u6c60\u8fd0\u884c\u673a\u5236-768x200.jpg 768w, http:\/\/prayerlaputa.com\/wp-content\/uploads\/2020\/08\/Java\u7ebf\u7a0b\u6c60\u8fd0\u884c\u673a\u5236.jpg 1100w\" sizes=\"(max-width: 412px) 100vw, 412px\" \/><\/p>\n<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u6982\u8ff0 <\/span><\/h2>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7ed3\u5408ThreadPoolExecutor\u7684\u8fd0\u884c\u8fc7\u7a0b\uff0c\u53ef\u4ee5\u77e5\u9053ThreadPoolExecutor\u4e3b\u8981\u503e\u5411\u4e8eCPU\u5bc6\u96c6\u578b\u4efb\u52a1\uff0c\u4f46\u5bf9\u4e8e\u5bf9\u4e8e <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>io<\/code><\/span><span class=\"md-plain\"> \u5bc6\u96c6\u578b\u4efb\u52a1\uff0c\u5982\u6570\u636e\u5e93\u67e5\u8be2\uff0crpc \u8bf7\u6c42\u8c03\u7528\u7b49\uff0c\u5c31\u4e0d\u662f\u5f88\u53cb\u597d\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7531\u4e8e Tomcat\/Jetty \u9700\u8981\u5904\u7406\u5927\u91cf\u5ba2\u6237\u7aef\u8bf7\u6c42\u4efb\u52a1\uff0c\u5982\u679c\u91c7\u7528\u539f\u751f\u7ebf\u7a0b\u6c60\uff0c\u4e00\u65e6\u63a5\u53d7\u8bf7\u6c42\u6570\u91cf\u5927\u4e8e\u7ebf\u7a0b\u6c60\u6838\u5fc3\u7ebf\u7a0b\u6570\uff0c\u8fd9\u4e9b\u8bf7\u6c42\u5c31\u4f1a\u88ab\u653e\u5165\u5230\u961f\u5217\u4e2d\uff0c\u7b49\u5f85\u6838\u5fc3\u7ebf\u7a0b\u5904\u7406\u3002\u8fd9\u6837\u505a\u663e\u7136\u964d\u4f4e\u8fd9\u4e9b\u8bf7\u6c42\u603b\u4f53\u5904\u7406\u901f\u5ea6\uff0c\u6240\u4ee5\u4e24\u8005\u90fd\u6ca1\u91c7\u7528 JDK \u539f\u751f\u7ebf\u7a0b\u6c60\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">Jetty\u9009\u62e9\u81ea\u5df1\u5b9e\u73b0\u7ebf\u7a0b\u6c60\u7ec4\u4ef6\uff0c\u53ef\u4ee5\u5b9a\u5236\u5316\u5f00\u53d1\uff0c\u4f46\u96be\u5ea6\u8f83\u5927\uff0c\u800cTomcat\u9009\u62e9\u6269\u5c55ThreadPoolExecutor\uff0c\u76f8\u5bf9\u6bd4\u8f83\u7b80\u5355\u3002<\/span><\/p>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Tomcat\u7ebf\u7a0b\u6c60\u6e90\u7801\u5206\u6790 <\/span><\/h2>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">Tomcat\u6e90\u7801\u4e2d\uff0c\u4e3a\u6269\u5c55\u7ebf\u7a0b\u6c60\uff0c\u4e3b\u8981\u4fee\u6539\u4e86\uff1a<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u81ea\u5b9a\u4e49ThreadPoolExecutor\uff0c\u76f4\u63a5\u7ee7\u627fJDK\u7684ThreadPoolExecutor\uff0c\u91cd\u5199\u90e8\u5206\u903b\u8f91<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5b9e\u73b0TaskQueue\uff0c\u76f4\u63a5\u7ee7\u627f<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>LinkedBlockingQueue<\/code><\/span><span class=\"md-plain\"> \uff0c\u91cd\u5199 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>offer<\/code><\/span><span class=\"md-plain\"> \u65b9\u6cd5\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">ThreadPoolExecutor<\/span><\/h3>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7ebf\u7a0b\u6c60\u6838\u5fc3\u65b9\u6cd5execute()\uff0cTomcat\u7b80\u5355\u505a\u4e86\u4fee\u6539\uff0c\u8fd8\u662f\u5c06\u5de5\u4f5c\u4efb\u52a1\u4ea4\u7ed9\u7236\u7c7b\uff0c\u4e5f\u5c31\u662fJava\u539f\u751f\u7ebf\u7a0b\u6c60\u5904\u7406\uff0c\u4f46\u589e\u52a0\u4e86\u4e00\u4e2a\u91cd\u8bd5\u7b56\u7565\u3002\u5982\u679c\u539f\u751f\u7ebf\u7a0b\u6c60\u6267\u884c\u62d2\u7edd\u7b56\u7565\u7684\u60c5\u51b5\uff0c\u629b\u51fa <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>RejectedExecutionException<\/code><\/span><span class=\"md-plain\"> \u5f02\u5e38\u3002\u8fd9\u91cc\u5c06\u4f1a\u6355\u83b7\uff0c\u7136\u540e\u91cd\u65b0\u518d\u6b21\u5c1d\u8bd5\u5c06\u4efb\u52a1\u52a0\u5165\u5230 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>TaskQueue<\/code><\/span><span class=\"md-plain\"> \uff0c\u5c3d\u6700\u5927\u53ef\u80fd\u6267\u884c\u4efb\u52a1\u3002<\/span><\/p>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"java\" spellcheck=\"false\"><span role=\"presentation\"><span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable-3\">void<\/span> <span class=\"cm-def\">execute<\/span>(<span class=\"cm-variable\">Runnable<\/span> <span class=\"cm-variable\">command<\/span>, <span class=\"cm-variable-3\">long<\/span> <span class=\"cm-variable\">timeout<\/span>, <span class=\"cm-variable\">TimeUnit<\/span> <span class=\"cm-variable\">unit<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">submittedCount<\/span>.<span class=\"cm-variable\">incrementAndGet<\/span>();<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">try<\/span> {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">execute<\/span>(<span class=\"cm-variable\">command<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  } <span class=\"cm-keyword\">catch<\/span> (<span class=\"cm-variable\">RejectedExecutionException<\/span> <span class=\"cm-variable\">var9<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-operator\">!<\/span>(<span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">getQueue<\/span>() <span class=\"cm-keyword\">instanceof<\/span> <span class=\"cm-variable\">TaskQueue<\/span>)) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">submittedCount<\/span>.<span class=\"cm-variable\">decrementAndGet<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-variable\">var9<\/span>;<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">TaskQueue<\/span> <span class=\"cm-variable\">queue<\/span> <span class=\"cm-operator\">=<\/span> (<span class=\"cm-variable\">TaskQueue<\/span>)<span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">getQueue<\/span>();<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">try<\/span> {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/\u62d2\u7edd\u540e\uff0c\u518d\u5c1d\u8bd5\u5165\u961f\uff0c\u8fd8\u4e0d\u884c\u5219\u629b\u51fa\u5f02\u5e38<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-operator\">!<\/span><span class=\"cm-variable\">queue<\/span>.<span class=\"cm-variable\">force<\/span>(<span class=\"cm-variable\">command<\/span>, <span class=\"cm-variable\">timeout<\/span>, <span class=\"cm-variable\">unit<\/span>)) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">submittedCount<\/span>.<span class=\"cm-variable\">decrementAndGet<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-keyword\">new<\/span> <span class=\"cm-variable\">RejectedExecutionException<\/span>(<span class=\"cm-variable\">sm<\/span>.<span class=\"cm-variable\">getString<\/span>(<span class=\"cm-string\">\"threadPoolExecutor.queueFull\"<\/span>));<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  } <span class=\"cm-keyword\">catch<\/span> (<span class=\"cm-variable\">InterruptedException<\/span> <span class=\"cm-variable\">var8<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">submittedCount<\/span>.<span class=\"cm-variable\">decrementAndGet<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-keyword\">new<\/span> <span class=\"cm-variable\">RejectedExecutionException<\/span>(<span class=\"cm-variable\">var8<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span><\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u9700\u8981\u6ce8\u610f <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>submittedCount<\/code><\/span><span class=\"md-plain\"> \u53d8\u91cf\u3002\u8fd9\u662f Tomcat \u7ebf\u7a0b\u6c60\u5185\u90e8\u4e00\u4e2a\u91cd\u8981\u7684\u53c2\u6570\uff0c\u5b83\u662f\u4e00\u4e2a <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>AtomicInteger<\/code><\/span><span class=\"md-plain\"> \u53d8\u91cf\uff0c\u5c06\u4f1a\u5b9e\u65f6\u7edf\u8ba1\u5df2\u7ecf\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60\u4e2d\uff0c\u4f46\u8fd8\u6ca1\u6709\u6267\u884c\u7ed3\u675f\u7684\u4efb\u52a1\u3002\u4e5f\u5c31\u662f\u8bf4 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>submittedCount<\/code><\/span><span class=\"md-plain\"> \u7b49\u4e8e\u7ebf\u7a0b\u6c60\u961f\u5217\u4e2d\u7684\u4efb\u52a1\u6570\u52a0\u4e0a\u7ebf\u7a0b\u6c60\u5de5\u4f5c\u7ebf\u7a0b\u6b63\u5728\u6267\u884c\u7684\u4efb\u52a1\u3002<\/span><\/p>\n<h3 class=\"md-end-block md-heading\"><span class=\"md-plain\">TaskQueue<\/span><\/h3>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"java\" spellcheck=\"false\"><span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"><span class=\"cm-keyword\">public<\/span> <span class=\"cm-keyword\">class<\/span> <span class=\"cm-def\">TaskQueue<\/span> <span class=\"cm-keyword\">extends<\/span> <span class=\"cm-variable\">LinkedBlockingQueue<\/span><span class=\"cm-operator\">&lt;<\/span><span class=\"cm-variable\">Runnable<\/span><span class=\"cm-operator\">&gt;<\/span> {<\/span>\r\n<span role=\"presentation\">    ......<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/tomcat-util-10.0.0-M6.jar<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable-3\">boolean<\/span> <span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">Runnable<\/span> <span class=\"cm-variable\">o<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">parent<\/span> <span class=\"cm-operator\">==<\/span> <span class=\"cm-atom\">null<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/1.\u82e5\u6ca1\u6709\u7ed9\u51fatomcat\u7ebf\u7a0b\u6c60\u5bf9\u8c61\uff0c\u5219\u8c03\u7528\u7236\u7c7b\u65b9\u6cd5<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span> <span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">o<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  } <span class=\"cm-keyword\">else<\/span> <span class=\"cm-keyword\">if<\/span> (<span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">parent<\/span>.<span class=\"cm-variable\">getPoolSize<\/span>() <span class=\"cm-operator\">==<\/span> <span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">parent<\/span>.<span class=\"cm-variable\">getMaximumPoolSize<\/span>()) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/2.\u82e5\u5f53\u524d\u7ebf\u7a0b\u6570\u5df2\u8fbe\u5230\u6700\u5927\u7ebf\u7a0b\u6570\uff0c\u5219\u653e\u5165\u963b\u585e\u961f\u5217<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span> <span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">o<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  } <span class=\"cm-keyword\">else<\/span> <span class=\"cm-keyword\">if<\/span> (<span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">parent<\/span>.<span class=\"cm-variable\">getSubmittedCount<\/span>() <span class=\"cm-operator\">&lt;=<\/span> <span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">parent<\/span>.<span class=\"cm-variable\">getPoolSize<\/span>()) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/3.\u82e5\u5f53\u524d\u5df2\u63d0\u4ea4\u4efb\u52a1\u6570\u91cf\u5c0f\u4e8e\u7b49\u4e8e\u6700\u5927\u7ebf\u7a0b\u6570\uff0c\u8bf4\u660e\u6b64\u65f6\u6709\u7a7a\u95f2\u7ebf\u7a0b\u3002\u6b64\u65f6\u5c06\u4efb\u52a1\u653e\u5165\u961f\u5217\u4e2d\uff0c\u7acb\u523b\u4f1a\u6709\u7a7a\u95f2\u7ebf\u7a0b\u6765\u5904\u7406\u8be5\u4efb\u52a1<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span> <span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">o<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  } <span class=\"cm-keyword\">else<\/span> {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/4.\u82e5\u5f53\u524d\u7ebf\u7a0b\u6570\u5c0f\u4e8e\u6700\u5927\u7ebf\u7a0b\u6570\uff0c\u53d1\u8fd4\u56defalse\uff0c\u6b64\u65f6\u7ebf\u7a0b\u6c60\u5c06\u4f1a\u521b\u5efa\u65b0\u7ebf\u7a0b\uff01\uff01\uff01<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span> <span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">parent<\/span>.<span class=\"cm-variable\">getPoolSize<\/span>() <span class=\"cm-operator\">&lt;<\/span> <span class=\"cm-keyword\">this<\/span>.<span class=\"cm-variable\">parent<\/span>.<span class=\"cm-variable\">getMaximumPoolSize<\/span>() <span class=\"cm-operator\">?<\/span> <span class=\"cm-atom\">false<\/span> : <span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">o<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span>\r\n<span role=\"presentation\">}<\/span>\r\n<span role=\"presentation\">\u200b<\/span><\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6838\u5fc3\u5728\u6700\u540e\u4e00\u4e2a\u4e09\u5143\u5224\u65ad\u4e2d\uff0c\u8fd9\u91cc\u9700\u8981\u7ed3\u5408Java\u7684ThreadPoolExecutor\u4e00\u8d77\u770b\uff1a<\/span><\/p>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"java\" spellcheck=\"false\"><span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> <span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable-3\">void<\/span> <span class=\"cm-def\">execute<\/span>(<span class=\"cm-variable\">Runnable<\/span> <span class=\"cm-variable\">command<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">command<\/span> <span class=\"cm-operator\">==<\/span> <span class=\"cm-atom\">null<\/span>)<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-keyword\">new<\/span> <span class=\"cm-variable\">NullPointerException<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/*<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* Proceed in 3 steps:<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">*<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* 1. If fewer than corePoolSize threads are running, try to<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* start a new thread with the given command as its first<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* task.  The call to addWorker atomically checks runState and<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* workerCount, and so prevents false alarms that would add<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* threads when it shouldn't, by returning false.<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">*<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* 2. If a task can be successfully queued, then we still need<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* to double-check whether we should have added a thread<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* (because existing ones died since last checking) or that<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* the pool shut down since entry into this method. So we<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* recheck state and if necessary roll back the enqueuing if<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* stopped, or start a new thread if there are none.<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">*<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* 3. If we cannot queue task, then we try to add a new<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* thread.  If it fails, we know we are shut down or saturated<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">* and so reject the task.<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-comment\">*\/<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable-3\">int<\/span> <span class=\"cm-variable\">c<\/span> <span class=\"cm-operator\">=<\/span> <span class=\"cm-variable\">ctl<\/span>.<span class=\"cm-variable\">get<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">workerCountOf<\/span>(<span class=\"cm-variable\">c<\/span>) <span class=\"cm-operator\">&lt;<\/span> <span class=\"cm-variable\">corePoolSize<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">addWorker<\/span>(<span class=\"cm-variable\">command<\/span>, <span class=\"cm-atom\">true<\/span>))<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span>;<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">c<\/span> <span class=\"cm-operator\">=<\/span> <span class=\"cm-variable\">ctl<\/span>.<span class=\"cm-variable\">get<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0    <span class=\"cm-comment\">\/\/\u5982\u679c\u963b\u585e\u961f\u5217\u8fd4\u56defalse\uff0c\u5c06\u4f1a\u8d70else\u5206\u652f\uff0c\u53bb\u521b\u5efa\u65b0\u7684\u7ebf\u7a0b<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">isRunning<\/span>(<span class=\"cm-variable\">c<\/span>) <span class=\"cm-operator\">&amp;&amp;<\/span> <span class=\"cm-variable\">workQueue<\/span>.<span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">command<\/span>)) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable-3\">int<\/span> <span class=\"cm-variable\">recheck<\/span> <span class=\"cm-operator\">=<\/span> <span class=\"cm-variable\">ctl<\/span>.<span class=\"cm-variable\">get<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-operator\">!<\/span> <span class=\"cm-variable\">isRunning<\/span>(<span class=\"cm-variable\">recheck<\/span>) <span class=\"cm-operator\">&amp;&amp;<\/span> <span class=\"cm-variable\">remove<\/span>(<span class=\"cm-variable\">command<\/span>))<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">reject<\/span>(<span class=\"cm-variable\">command<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">else<\/span> <span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">workerCountOf<\/span>(<span class=\"cm-variable\">recheck<\/span>) <span class=\"cm-operator\">==<\/span> <span class=\"cm-number\">0<\/span>)<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">addWorker<\/span>(<span class=\"cm-atom\">null<\/span>, <span class=\"cm-atom\">false<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">else<\/span> <span class=\"cm-keyword\">if<\/span> (<span class=\"cm-operator\">!<\/span><span class=\"cm-variable\">addWorker<\/span>(<span class=\"cm-variable\">command<\/span>, <span class=\"cm-atom\">false<\/span>))<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">reject<\/span>(<span class=\"cm-variable\">command<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span><\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u7531\u6b64\uff0c\u5373\u53ef\u770b\u51faTomcat\u901a\u8fc7\u6269\u5c55\u7684\u65b9\u5f0f\u6539\u53d8\u4e86\u7ebf\u7a0b\u6c60\u8fd0\u884c\u673a\u5236\u3002<\/span><\/p>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">Dubbo\u7ebf\u7a0b\u6c60\u6e90\u7801\u5206\u6790<\/span><\/h2>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">dubbo\u4e2d\u4e5f\u91c7\u7528\u4e86\u4e0eTomcat\u4e00\u6837\u7684\u601d\u8def\u53bb\u4fee\u6539Java\u7ebf\u7a0b\u6c60\uff0c\u53ef\u4ee5\u53c2\u8003\u6e90\u7801\u4e2d\u7684EagerThreadPool\uff0c\u4e5f\u662f\u540c\u6837\u7684\u4fee\u6539\uff1a<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u81ea\u5b9a\u4e49ThreadPoolExecutor\uff0c\u76f4\u63a5\u7ee7\u627fJDK\u7684ThreadPoolExecutor\uff0c\u91cd\u5199\u90e8\u5206\u903b\u8f91<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u5b9e\u73b0TaskQueue\uff0c\u76f4\u63a5\u7ee7\u627f<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>LinkedBlockingQueue<\/code><\/span><span class=\"md-plain\"> \uff0c\u91cd\u5199 <\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>offer<\/code><\/span><span class=\"md-plain\"> \u65b9\u6cd5\u3002<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>EagerThreadPoolExecutor<\/code><\/span><span class=\"md-plain\">\u6e90\u7801\u603b\u5171\u5c31\u8fd9\u4e48\u4e00\u4e22\u4e22\uff0c\u91cd\u5199\u7684\u903b\u8f91\u662f\uff1a<\/span><\/p>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">execute\u65b9\u6cd5\u6dfb\u52a0\u4e00\u6b21\u91cd\u8bd5<\/span><\/p>\n<\/li>\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u52a0\u4e0a\u6709\u5173<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>submittedTaskCount<\/code><\/span><span class=\"md-plain\">\u8fd9\u4e2a\u53d8\u91cf\u7684\u7ef4\u62a4\uff0c\u8be5\u53d8\u91cf\u8868\u793a\u5f53\u524d\u6b63\u5728\u88ab\u6267\u884c\u7684\u4efb\u52a1\u6570\u91cf<\/span><\/p>\n<\/li>\n<\/ul>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"java\" spellcheck=\"false\"><span role=\"presentation\"><span class=\"cm-keyword\">public<\/span> <span class=\"cm-keyword\">class<\/span> <span class=\"cm-def\">EagerThreadPoolExecutor<\/span> <span class=\"cm-keyword\">extends<\/span> <span class=\"cm-variable\">ThreadPoolExecutor<\/span> {<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-comment\">\/**<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">* task count<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">*\/<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">private<\/span> <span class=\"cm-keyword\">final<\/span> <span class=\"cm-variable\">AtomicInteger<\/span> <span class=\"cm-variable\">submittedTaskCount<\/span> <span class=\"cm-operator\">=<\/span> <span class=\"cm-keyword\">new<\/span> <span class=\"cm-variable\">AtomicInteger<\/span>(<span class=\"cm-number\">0<\/span>);<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable\">EagerThreadPoolExecutor<\/span>(<span class=\"cm-variable-3\">int<\/span> <span class=\"cm-variable\">corePoolSize<\/span>,<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-variable-3\">int<\/span> <span class=\"cm-variable\">maximumPoolSize<\/span>,<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-variable-3\">long<\/span> <span class=\"cm-variable\">keepAliveTime<\/span>,<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-variable\">TimeUnit<\/span> <span class=\"cm-variable\">unit<\/span>, <span class=\"cm-variable\">TaskQueue<\/span><span class=\"cm-operator\">&lt;<\/span><span class=\"cm-variable\">Runnable<\/span><span class=\"cm-operator\">&gt;<\/span> <span class=\"cm-variable\">workQueue<\/span>,<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-variable\">ThreadFactory<\/span> <span class=\"cm-variable\">threadFactory<\/span>,<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <span class=\"cm-variable\">RejectedExecutionHandler<\/span> <span class=\"cm-variable\">handler<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">super<\/span>(<span class=\"cm-variable\">corePoolSize<\/span>, <span class=\"cm-variable\">maximumPoolSize<\/span>, <span class=\"cm-variable\">keepAliveTime<\/span>, <span class=\"cm-variable\">unit<\/span>, <span class=\"cm-variable\">workQueue<\/span>, <span class=\"cm-variable\">threadFactory<\/span>, <span class=\"cm-variable\">handler<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-comment\">\/**<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">* @return current tasks which are executed<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">*\/<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable-3\">int<\/span> <span class=\"cm-variable\">getSubmittedTaskCount<\/span>() {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span> <span class=\"cm-variable\">submittedTaskCount<\/span>.<span class=\"cm-variable\">get<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-meta\">@Override<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">protected<\/span> <span class=\"cm-variable-3\">void<\/span> <span class=\"cm-variable\">afterExecute<\/span>(<span class=\"cm-variable\">Runnable<\/span> <span class=\"cm-variable\">r<\/span>, <span class=\"cm-variable\">Throwable<\/span> <span class=\"cm-variable\">t<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">submittedTaskCount<\/span>.<span class=\"cm-variable\">decrementAndGet<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-meta\">@Override<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable-3\">void<\/span> <span class=\"cm-variable\">execute<\/span>(<span class=\"cm-variable\">Runnable<\/span> <span class=\"cm-variable\">command<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">command<\/span> <span class=\"cm-operator\">==<\/span> <span class=\"cm-atom\">null<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-keyword\">new<\/span> <span class=\"cm-variable\">NullPointerException<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/ do not increment in method beforeExecute!<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">submittedTaskCount<\/span>.<span class=\"cm-variable\">incrementAndGet<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">try<\/span> {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">execute<\/span>(<span class=\"cm-variable\">command<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  } <span class=\"cm-keyword\">catch<\/span> (<span class=\"cm-variable\">RejectedExecutionException<\/span> <span class=\"cm-variable\">rx<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/ retry to offer the task into queue.<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">final<\/span> <span class=\"cm-variable\">TaskQueue<\/span> <span class=\"cm-variable\">queue<\/span> <span class=\"cm-operator\">=<\/span> (<span class=\"cm-variable\">TaskQueue<\/span>) <span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">getQueue<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">try<\/span> {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-operator\">!<\/span><span class=\"cm-variable\">queue<\/span>.<span class=\"cm-variable\">retryOffer<\/span>(<span class=\"cm-variable\">command<\/span>, <span class=\"cm-number\">0<\/span>, <span class=\"cm-variable\">TimeUnit<\/span>.<span class=\"cm-variable\">MILLISECONDS<\/span>)) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">submittedTaskCount<\/span>.<span class=\"cm-variable\">decrementAndGet<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-keyword\">new<\/span> <span class=\"cm-variable\">RejectedExecutionException<\/span>(<span class=\"cm-string\">\"Queue capacity is full.\"<\/span>, <span class=\"cm-variable\">rx<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  } <span class=\"cm-keyword\">catch<\/span> (<span class=\"cm-variable\">InterruptedException<\/span> <span class=\"cm-variable\">x<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">submittedTaskCount<\/span>.<span class=\"cm-variable\">decrementAndGet<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-keyword\">new<\/span> <span class=\"cm-variable\">RejectedExecutionException<\/span>(<span class=\"cm-variable\">x<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  } <span class=\"cm-keyword\">catch<\/span> (<span class=\"cm-variable\">Throwable<\/span> <span class=\"cm-variable\">t<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/ decrease any way<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">submittedTaskCount<\/span>.<span class=\"cm-variable\">decrementAndGet<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-variable\">t<\/span>;<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span>\r\n<span role=\"presentation\">}<\/span><\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-pair-s\" spellcheck=\"false\"><code>TaskQueue<\/code><\/span><span class=\"md-plain\">\u540c\u6837\u662f\u7ee7\u627f\u81ea<\/span><span class=\"md-pair-s\" spellcheck=\"false\"><code>LinkedBlockingQueue<\/code><\/span><span class=\"md-plain\">\uff0c\u4e5f\u53ea\u662f\u6539\u4e86\u4e00\u4e22\u4e22\uff1a<\/span><\/p>\n<pre class=\"md-fences md-end-block ty-contain-cm modeLoaded\" lang=\"java\" spellcheck=\"false\"><span role=\"presentation\"><span class=\"cm-keyword\">public<\/span> <span class=\"cm-keyword\">class<\/span> <span class=\"cm-def\">TaskQueue<\/span><span class=\"cm-operator\">&lt;<\/span><span class=\"cm-variable\">R<\/span> <span class=\"cm-keyword\">extends<\/span> <span class=\"cm-variable\">Runnable<\/span><span class=\"cm-operator\">&gt;<\/span> <span class=\"cm-keyword\">extends<\/span> <span class=\"cm-variable\">LinkedBlockingQueue<\/span><span class=\"cm-operator\">&lt;<\/span><span class=\"cm-variable\">Runnable<\/span><span class=\"cm-operator\">&gt;<\/span> {<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">private<\/span> <span class=\"cm-keyword\">static<\/span> <span class=\"cm-keyword\">final<\/span> <span class=\"cm-variable-3\">long<\/span> <span class=\"cm-variable\">serialVersionUID<\/span> <span class=\"cm-operator\">=<\/span> <span class=\"cm-operator\">-<\/span><span class=\"cm-number\">2635853580887179627L<\/span>;<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">private<\/span> <span class=\"cm-variable\">EagerThreadPoolExecutor<\/span> <span class=\"cm-variable\">executor<\/span>;<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable\">TaskQueue<\/span>(<span class=\"cm-variable-3\">int<\/span> <span class=\"cm-variable\">capacity<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">super<\/span>(<span class=\"cm-variable\">capacity<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable-3\">void<\/span> <span class=\"cm-variable\">setExecutor<\/span>(<span class=\"cm-variable\">EagerThreadPoolExecutor<\/span> <span class=\"cm-variable\">exec<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable\">executor<\/span> <span class=\"cm-operator\">=<\/span> <span class=\"cm-variable\">exec<\/span>;<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-meta\">@Override<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable-3\">boolean<\/span> <span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">Runnable<\/span> <span class=\"cm-variable\">runnable<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">executor<\/span> <span class=\"cm-operator\">==<\/span> <span class=\"cm-atom\">null<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-keyword\">new<\/span> <span class=\"cm-variable\">RejectedExecutionException<\/span>(<span class=\"cm-string\">\"The task queue does not have executor!\"<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-variable-3\">int<\/span> <span class=\"cm-variable\">currentPoolThreadSize<\/span> <span class=\"cm-operator\">=<\/span> <span class=\"cm-variable\">executor<\/span>.<span class=\"cm-variable\">getPoolSize<\/span>();<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/ have free worker. put task into queue to let the worker deal with task.<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">executor<\/span>.<span class=\"cm-variable\">getSubmittedTaskCount<\/span>() <span class=\"cm-operator\">&lt;<\/span> <span class=\"cm-variable\">currentPoolThreadSize<\/span>) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span> <span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">runnable<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/ return false to let executor create new worker.<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">currentPoolThreadSize<\/span> <span class=\"cm-operator\">&lt;<\/span> <span class=\"cm-variable\">executor<\/span>.<span class=\"cm-variable\">getMaximumPoolSize<\/span>()) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span> <span class=\"cm-atom\">false<\/span>;<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-comment\">\/\/ currentPoolThreadSize &gt;= max<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span> <span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">runnable<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span>\r\n<span role=\"presentation\">\u200b<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-comment\">\/**<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">* retry offer task<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">*<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">* @param o task<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">* @return offer success or not<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">* @throws RejectedExecutionException if executor is terminated.<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 <span class=\"cm-comment\">*\/<\/span><\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0<span class=\"cm-keyword\">public<\/span> <span class=\"cm-variable-3\">boolean<\/span> <span class=\"cm-variable\">retryOffer<\/span>(<span class=\"cm-variable\">Runnable<\/span> <span class=\"cm-variable\">o<\/span>, <span class=\"cm-variable-3\">long<\/span> <span class=\"cm-variable\">timeout<\/span>, <span class=\"cm-variable\">TimeUnit<\/span> <span class=\"cm-variable\">unit<\/span>) <span class=\"cm-keyword\">throws<\/span> <span class=\"cm-variable\">InterruptedException<\/span> {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">if<\/span> (<span class=\"cm-variable\">executor<\/span>.<span class=\"cm-variable\">isShutdown<\/span>()) {<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">throw<\/span> <span class=\"cm-keyword\">new<\/span> <span class=\"cm-variable\">RejectedExecutionException<\/span>(<span class=\"cm-string\">\"Executor is shutdown!\"<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0  }<\/span>\r\n<span role=\"presentation\"> \u00a0 \u00a0 \u00a0 \u00a0<span class=\"cm-keyword\">return<\/span> <span class=\"cm-keyword\">super<\/span>.<span class=\"cm-variable\">offer<\/span>(<span class=\"cm-variable\">o<\/span>, <span class=\"cm-variable\">timeout<\/span>, <span class=\"cm-variable\">unit<\/span>);<\/span>\r\n<span role=\"presentation\"> \u00a0  }<\/span>\r\n<span role=\"presentation\">}<\/span><\/pre>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u91cd\u70b9\u8fd8\u662f\u5728offer\u65b9\u6cd5\u7684\u5b9e\u73b0\uff0c\u5f00\u53d1\u8005\u90fd\u5199\u4e86\u6ce8\u91ca\uff0c\u6211\u5c31\u4e0d\u5e9f\u8bdd\u4e86 \ud83d\ude42 \u771f\u7684\u662f\u548ctomcat\u4e00\u6bdb\u4e00\u6837\u7684\u601d\u8def\u3002<\/span><\/p>\n<p class=\"md-end-block md-p\"><span class=\"md-plain\">\u6536\u5de5\u3002<\/span><\/p>\n<h2 class=\"md-end-block md-heading\"><span class=\"md-plain\">\u53c2\u8003\u8d44\u6599 <\/span><\/h2>\n<ul class=\"ul-list\" data-mark=\"-\">\n<li class=\"md-list-item\">\n<p class=\"md-end-block md-p\"><span class=\"md-meta-i-c  md-link\"><a spellcheck=\"false\" href=\"https:\/\/zhuanlan.zhihu.com\/p\/94679167\"><span class=\"md-plain\">\u539f\u751f\u7ebf\u7a0b\u6c60\u8fd9\u4e48\u5f3a\u5927\uff0cTomcat \u4e3a\u4f55\u8fd8\u9700\u6269\u5c55\u7ebf\u7a0b\u6c60\uff1f<\/span><\/a><\/span><\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u9884\u5907\u77e5\u8bc6 \u8ba1\u7b97\u4efb\u52a1\u7684\u5206\u7c7b CPU\u5bc6\u96c6\u578b\uff1a\u9700\u8981\u7ebf\u7a0b\u957f\u65f6\u95f4\u8fdb\u884c\u7684\u590d\u6742\u7684\u8fd0\u7b97\uff0c\u8fd9\u79cd\u7c7b\u578b\u7684\u4efb\u52a1\u9700\u8981\u5c11\u521b\u5efa\u7ebf\u7a0b\uff0c\u8fc7\u591a\u7684\u7ebf <a href='http:\/\/prayerlaputa.com\/?p=845' class='excerpt-more'>[&#8230;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[6,99,18],"tags":[33,101,50,100],"_links":{"self":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/845"}],"collection":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=845"}],"version-history":[{"count":1,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/845\/revisions"}],"predecessor-version":[{"id":847,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/845\/revisions\/847"}],"wp:attachment":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=845"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}