Java ThreadPool Executor awaitTermination() Method

The awaitTermination() method of ThreadPoolExecutor class blocks until tasks in the thread pool completes the execution or time for execution elapses.

Syntax

public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException

Parameter

timeout - the maximum time to wait

unit - the time unit of the timeout argument

Returns

True if this executor terminated and false if the timeout elapsed before termination

Throw

InterruptedException - if interrupted while waiting

Example 1

import java.util.concurrent.*;
import java.lang.Thread;
import java.util.logging.Level;
import java.util.logging.Logger;
 class MYThreadPoolExecutor7 extends ThreadPoolExecutor {
  public MYThreadPoolExecutor7() { 
       super(1,10,60,TimeUnit.SECONDS,new ArrayBlockingQueue<Runnable>(1000));
   }
   @Override
   protected void afterExecute(Runnable r, Throwable t) {
     super.afterExecute(r, t);
     if (t == null && r instanceof Future<?>) {
       try {
         Object Obj = ((Future<?>) r).get();
         System.out.println(Obj);
       } catch (InterruptedException | ExecutionException e) {  } 
     }
   }
 }
 public class ThreadPoolExecuteawaitTerminationExample1 {
    public static void main(String args[]) throws InterruptedException{
        System.out.println("creating service");
        MYThreadPoolExecutor7 obj2 = new MYThreadPoolExecutor7();
        Future<?> sb = obj2.submit(() -> {
            try {
                obj2.awaitTermination(10, TimeUnit.SECONDS);                   //await termination method
            } catch (InterruptedException ex) {
Logger.getLogger(ThreadPoolExecuteawaitTerminationExample1.class.getName()).log(Level.SEVERE, null, ex);
            }
             System.out.println("await termination for thread:"+Thread.currentThread().getName());
        });
        obj2.shutdown();
           }
}

Test it Now

Output:

creating service
await termination for thread:pool-1-thread-1
null

Example 2

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
public class ThreadPoolExecuteawaitTerminationExample2  {
	public static void main(String[] args) throws InterruptedException {
		//Creating a thread pool
		ThreadPoolExecutor obj = new ThreadPoolExecuteawaitTerminationExample2 ().new MyThreadExecutor(2, 3, 1, TimeUnit.SECONDS, new LinkedBlockingQueue<>());
	 obj.execute(() -> {
                            System.out.println("In Runnable!");
                              try {
                                    obj.awaitTermination(10, TimeUnit.MILLISECONDS);
                                  } catch (InterruptedException ex) {
 Logger.getLogger(ThreadPoolExecuteawaitTerminationExample2.class.getName()).log(Level.SEVERE, null, ex);
                                                            }
                                         
                          });
           obj.shutdown();
	                                                  }
  
    class MyThreadExecutor extends ThreadPoolExecutor {
  public MyThreadExecutor(int PoolSize, int maxPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) throws InterruptedException
                          {
			           super(PoolSize, maxPoolSize, keepAliveTime, unit, workQueue);                               			            if (this.allowsCoreThreadTimeOut())
                                            this.awaitTermination(5, TimeUnit.SECONDS);
			             else
                                              System.out.println("allowCoreThreadTimeOut  is already true");
		             }
		                            }        
}

Test it Now

Output:

allowCoreThreadTimeOut  is already true
In Runnable!

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