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如何在運行時停止/殺死長時間運行的 Java 線程？ 超時 -> 取消 -> 中斷狀態

已發表: 2021-07-17

如何殺死比預期更長的Java線程完成？超時 -> 取消 -> 中斷狀態

你有沒有想過如何殺死長時間運行的 Java 線程？ 您有以下任何問題嗎？

  • 一段時間後殺死/停止線程
  • 在Java中的某個指定時間限制後殺死線程
  • 如何殺死一個 Java 線程
  • 如何通過示例停止 Java 中的線程
  • 如何在java代碼示例中停止線程
  • 如何在不使用停止方法的情況下停止java中的線程

如果您有以下任何問題，那麼您來對地方了。 今天我們將通過一個簡單的例子來演示 Java8 殺死長時間運行的線程的方法。

什麼是邏輯：

  1. 創建類 CrunchifyJavaTaskTimeout.java
  2. 創建只有 1 個線程池大小的 Java 線程執行器。
  3. 為CrunchifyRunner對象創建 4 個未來任務，超時時間為 3 秒
  4. CrunchifyRunner.java 是一個實現call()方法的簡單類
    • 如果futureTask = 4 ，它會引入20 seconds的延遲
  5. 一旦未來達到3 seconds的時間，如果線程仍在運行，它會創建超時異常
    • 一旦超時，我們需要使用 crunchifyFuture 取消任務。 cancel( true ) ；
    • 一旦futureTask被取消，它就會觸發InterruptedException （當線程正在等待、休眠或以其他方式被佔用，並且線程在活動之前或活動期間被中斷時拋出。有時一個方法可能希望測試當前線程是否已被中斷，如果是這樣，立即拋出這個異常。）

讓我們開始吧：

Step-1 創建 CrunchifyRunner.java 類

CrunchifyRunner.java
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package crunchify . java . tutorials ;
 
import java . text . SimpleDateFormat ;
import java . util . Date ;
import java . util . concurrent . Callable ;
 
/**
* @author Crunchify.com
* Version: 1.0.1
*
*/
 
public class CrunchifyRunner implements Callable < Boolean > {
 
private int workerNumber ;
 
public int getNumber ( ) {
return workerNumber ;
}
 
public void setNumber ( int workerNumber ) {
this . workerNumber = workerNumber ;
}
 
public CrunchifyRunner ( int workerNumber ) {
this . workerNumber = workerNumber ;
setNumber ( workerNumber ) ;
}
 
SimpleDateFormat crunchifyFormatter = new SimpleDateFormat ( "dd-MMMMM-yyyy hh:mm:ss" ) ;
 
public Boolean call ( ) throws InterruptedException {
try {
if ( workerNumber == 4 ) {
 
// Sleep for 20 Seconds to generate long running thread.
Thread . sleep ( 20000 ) ;
} else {
Thread . sleep ( 50 ) ;
}
} catch ( InterruptedException ie ) {
log ( "\n" + crunchifyFormatter . format ( new Date ( ) ) + " crunchifyWorker task " + workerNumber + " interrupted." ) ;
log ( "\n=======> Basically once thread is timed out, it should be cancelled and interrupted. (timedout ==> cancelled ==> interrupted)" ) ;
}
 
// Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted, either before or during the activity. Occasionally a
// method may wish to test whether the current thread has been interrupted, and if so, to immediately throw this exception.
return true ;
}
 
public void log ( String info ) {
System . out . println ( info ) ;
 
}
}

Step-2 創建類 CrunchifyJavaTaskTimeout.java

CrunchifyJavaTaskTimeout.java
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package crunchify . java . tutorials ;
 
import java . text . SimpleDateFormat ;
import java . util . ArrayList ;
import java . util . Collection ;
import java . util . Date ;
import java . util . List ;
import java . util . concurrent . Callable ;
import java . util . concurrent . CompletionService ;
import java . util . concurrent . ExecutionException ;
import java . util . concurrent . ExecutorCompletionService ;
import java . util . concurrent . Executors ;
import java . util . concurrent . Future ;
import java . util . concurrent . TimeUnit ;
 
/**
* @author Crunchify.com
* Version: 1.0.2
*
*/
 
public class CrunchifyJavaTaskTimeout {
 
@ SuppressWarnings ( { "rawtypes" , "unchecked" } )
 
public static void main ( final String [ ] args ) {
 
// Creates an ExecutorCompletionService using the supplied executor for base task execution and a LinkedBlockingQueue as a completion queue.
CompletionService < Boolean > crunchifyService = new ExecutorCompletionService < Boolean > ( Executors . newFixedThreadPool ( 1 ) ) ;
 
Collection < CrunchifyRunner > crunchifyThreads = new ArrayList < CrunchifyRunner > ( 50 ) ;
 
crunchifyThreads . add ( new CrunchifyRunner ( 1 ) ) ;
crunchifyThreads . add ( new CrunchifyRunner ( 2 ) ) ;
crunchifyThreads . add ( new CrunchifyRunner ( 3 ) ) ;
crunchifyThreads . add ( new CrunchifyRunner ( 4 ) ) ;
 
SimpleDateFormat crunchifyFormatter = new SimpleDateFormat ( "dd-MMMMM-yyyy hh:mm:ss" ) ;
 
List < Future < Boolean > > crunchifyFutures = new ArrayList < Future < Boolean > > ( crunchifyThreads . size ( ) ) ;
try {
 
// Let's first add all tasks to future
for ( Callable crunchifyTask : crunchifyThreads ) {
 
crunchifyFutures . add ( crunchifyService . submit ( crunchifyTask ) ) ;
}
for ( int count = 1 ; count < = crunchifyFutures . size ( ) ; count ++ ) {
 
// Let's put Future timeout to 3 Seconds
Future < Boolean > crunchifyResult = crunchifyService . poll ( 3000 , TimeUnit . MILLISECONDS ) ;
if ( crunchifyResult == null ) {
 
log ( crunchifyFormatter . format ( new Date ( ) ) + "\n ==> crunchifyWorker task " + count + " timedout." ) ;
 
// So lets cancel the first futures we find that haven't completed
for ( Future crunchifyFuture : crunchifyFutures ) {
if ( crunchifyFuture . isDone ( ) ) {
continue ;
} else {
crunchifyFuture . cancel ( true ) ;
log ( " ==> crunchifyWorker task " + count + " cancelled." ) ;
break ;
}
}
continue ;
} else {
try {
if ( crunchifyResult . isDone ( ) && !crunchifyResult.isCancelled() && crunchifyResult.get()) {
log(crunchifyFormatter.format(new Date()) + " ==> crunchifyWorker task " + count + " completed.");
 
} else {
log ( crunchifyFormatter . format ( new Date ( ) ) + " ==> crunchifyWorker task failed" ) ;
}
} catch ( ExecutionException exception ) {
log ( exception . getMessage ( ) ) ;
}
}
}
} catch ( InterruptedException exception ) {
 
// Log exception message
log ( exception . getMessage ( ) ) ;
} finally {
 
// Cancel by interrupting any existing tasks currently running in Executor Service
for ( Future < Boolean > future : crunchifyFutures ) {
future . cancel ( true ) ;
}
}
log ( "\n=======> All tasks completed. Now long running thread 4 should be interrupted immediately after this." ) ;
System . exit ( 0 ) ;
}
 
private static void log ( String string ) {
System . out . println ( string ) ;
 
}
 
}

第三步

右鍵單擊 CrunchifyJavaTaskTimeout.java 並將其作為 Java 應用程序運行。

您將在 Eclipse 控制台中看到以下結果。

如何在運行時殺死停止java線程

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27 - November - 2018 10 : 32 : 29 == > crunchifyWorker task 1 completed .
27 - November - 2018 10 : 32 : 29 == > crunchifyWorker task 2 completed .
27 - November - 2018 10 : 32 : 29 == > crunchifyWorker task 3 completed .
27 - November - 2018 10 : 32 : 32
== > crunchifyWorker task 4 timedout .
== > crunchifyWorker task 4 cancelled .
 
======= > All tasks completed . Now long running thread 4 should be interrupted immediately after this .
 
27 - November - 2018 10 : 32 : 32 crunchifyWorker task 4 interrupted .
 
======= > Basically once thread is timed out , it should be cancelled and interrupted . ( timedout == > cancelled == > interrupted )

如果您對此主題有任何疑問，請告訴我。