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Example of ThreadPoolExecutor.DiscardPolicy in Java

By Arvind Rai, January 11, 2013
1. ThreadPoolExecutor.DiscardPolicy belongs to java.util.concurrent package. It has been introduced in JDK 1.5.
2. ThreadPoolExecutor.DiscardPolicy is the handler for rejected task by ThreadPoolExecutor. It silently discards the rejected task and throws no error.
3. ThreadPoolExecutor.DiscardPolicy has a method rejectedExecution(Runnable r, ThreadPoolExecutor e) which accepts a Runnable task and ThreadPoolExecutor.

ThreadPoolExecutor.DiscardPolicy is passed as an argument while initializing ThreadPoolExecutor.
ThreadPoolExecutor  tpool= new ThreadPoolExecutor(2,3,500, TimeUnit.MILLISECONDS,
		 new LinkedBlockingQueue<Runnable>(), new ThreadPoolExecutor.DiscardPolicy());
Find the sample example.

DiscardPolicyDemo.java
package com.concretepage;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class DiscardPolicyDemo {
	   class DemoThread implements Runnable {
		   public void run() {
		    	 System.out.println("Hello World");
	           }
	   }
	   public static void main(String... args) {
		   Runnable th=new DiscardPolicyDemo().new DemoThread();
		     
		   ThreadPoolExecutor  tpool= new ThreadPoolExecutor(2,3,500, TimeUnit.MILLISECONDS,
		    		 new LinkedBlockingQueue<Runnable>(), new ThreadPoolExecutor.DiscardPolicy());
		     
		   tpool.execute(th);
	   }
}

Output
Hello World 
POSTED BY
ARVIND RAI
ARVIND RAI
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