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小編這次要給大家分享的是詳解Java中ExcutorService如何優(yōu)雅關(guān)閉,文章內(nèi)容豐富,感興趣的小伙伴可以來(lái)了解一下,希望大家閱讀完這篇文章之后能夠有所收獲。
關(guān)閉時(shí)可使用如下代碼
public static void waitUntilTerminate(final ExecutorService executorService, final int timeout) { try { executorService.shutdown(); if (!executorService.awaitTermination(timeout, TimeUnit.SECONDS)) { //超時(shí)后直接關(guān)閉 executorService.shutdownNow(); } } catch (InterruptedException e) { //awaitTermination 出現(xiàn)中斷異常也將觸發(fā)關(guān)閉 executorService.shutdownNow(); } }
但是實(shí)際使用中,可能會(huì)出現(xiàn)即使使用了shutdownNow方法,還是無(wú)法終止線(xiàn)程的問(wèn)題,那是因?yàn)槟愕木€(xiàn)程無(wú)法被中斷
shutdownNow方法簡(jiǎn)單理解就是給在運(yùn)行的線(xiàn)程發(fā)一個(gè)中斷信號(hào),如果你的線(xiàn)程忽略這個(gè)信號(hào),那就無(wú)法停下來(lái)
舉個(gè)例子來(lái)說(shuō)明這個(gè)問(wèn)題
public class ShutDownUtilsTest { private ExecutorService executorService; @Before public void init() { executorService = Executors.newFixedThreadPool(1); } @Test public void shutDownOKTest() { ShutDownUtils.waitUntilTerminate(executorService, 1); CommonUtils.sleep(1); //等待線(xiàn)程處理中斷 Assert.assertTrue(executorService.isTerminated()); } @Test public void shutDownNowFailTest() { executorService.execute(this::canNotStopThread); ShutDownUtils.waitUntilTerminate(executorService, 0); CommonUtils.sleep(1); //等待線(xiàn)程處理中斷 Assert.assertFalse(executorService.isTerminated()); } @Test public void shutDownNowOKTest() { executorService.execute(this::stopThread); ShutDownUtils.waitUntilTerminate(executorService, 0); CommonUtils.sleep(1); //等待線(xiàn)程處理中斷 Assert.assertTrue(executorService.isTerminated()); } private void canNotStopThread() { for (long i = 0; i < Long.MAX_VALUE; i++) { } } private void stopThread() { for (long i = 0; i < Long.MAX_VALUE && !Thread.currentThread().isInterrupted(); i++) { } } }
從上面的測(cè)試用例可以看到canNotStopThread無(wú)法被shutDownNow終止
然而stopThread可以被正常終止,因?yàn)橥ㄟ^(guò)Thread.currentThread().isInterrupted()在判斷線(xiàn)程是否收到了中斷信號(hào)
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