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Example of Exchanger in Java

By Arvind Rai, December 17, 2012
Exchanger class in available from jdk1.5. Exchanger class in java exchanges objects between the threads at any synchronization point. The class Exchanger has only one method i.e exchange. Exchange method accepts the object as argument and returns the object. Find the example for better understanding.
ExchangerTest.java
package com.concretepage;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Exchanger;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class ExchangerTest {
          Exchanger<List<String>> exchanger = new Exchanger<List<String>>();
	  List<String>  exchnagerList= new ArrayList<String>();
	   class AddList implements Runnable {
	     public void run() {
	       try {
	         while (true) {
	           exchnagerList.add("1");
	           if (exchnagerList.size()==1){
	        	   exchnagerList = exchanger.exchange(exchnagerList);
	        	   
	           }
	         }
	       } catch (InterruptedException ex) { System.out.println(ex); }
	     }
	   }
	   class SubtractList implements Runnable {
	     public void run() {
	       try {
	         while (true) {
	        	 exchnagerList.remove("1");
	        	 if (exchnagerList.size()==0){
	        	   exchnagerList = exchanger.exchange(exchnagerList);
	        	   
	                 }
	         }
	       } catch (InterruptedException ex) { System.out.println(ex);}
	     }
	   }
	   public static void main(String... args) {
		   final ExecutorService exService = Executors.newFixedThreadPool(2);
		   ExchangerTest ob = new ExchangerTest();
		   exService.execute(ob.new SubtractList());
		   exService.execute(ob.new AddList());
	   }
} 
POSTED BY
ARVIND RAI
ARVIND RAI
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