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import javax.jms.*;
import java.util.concurrent.CountDownLatch;

/**
 * The AsyncTopicConsumerExample.class receives messages from
 * a topic using asynchronous message delivery.
 * 

* Run this program in conjunction with AsyncTopicProducerExample * Specify a topic name on the command line when you run * the program. By default, the program receives one message. Specify a number * after the topic name to receive that number of messages. */ public class AsyncTopicConsumerExample { private String destName = null; private int noOfMsgs; static int exitcode = 0; /** * Main method. * * @param args the topic used by the example and, optionally, the * number of messages to receive */ public static void main(String args[]) { if ( (args.length < 1) || (args.length > 2) ) { System.out.println("Usage: java AsyncTopicConsumerExample []"); System.exit(1); } AsyncTopicConsumerExample recvMsg = new AsyncTopicConsumerExample(); recvMsg.parseArgs(args); try { // Receive messages from topic recvMsg.receivemsgs(); }catch(JMSException ex) { ex.printStackTrace(); exitcode = 1; } System.exit(exitcode); } /** * parseArgs method. * * @param args the arguments that are passed through main method */ public void parseArgs(String[] args){ destName = new String(args[0]); System.out.println("Topic name is " + destName); if (args.length == 2){ noOfMsgs = (new Integer(args[1])).intValue(); } else { noOfMsgs = 1; } } /** * Receive messages asynchronously from the topic destination * * @param none * @throws JMSException */ public void receivemsgs() throws JMSException { // Create connection factory for the MQ client ConnectionFactory cf = new com.sun.messaging.ConnectionFactory(); // JMSContext will be closed automatically with the try-with-resources block try (JMSContext jmsContext = cf.createContext(JMSContext.AUTO_ACKNOWLEDGE);) { System.out.println("Created jms context successfully"); // Create topic Topic topic = jmsContext.createTopic(destName); System.out.println("Created topic successfully"); // Create consumer JMSConsumer consumer = jmsContext.createConsumer(topic); MessageHandler listener = new MessageHandler(noOfMsgs); // Set message listener on consumer consumer.setMessageListener(listener); jmsContext.start(); listener.await(); } } /** * The MessageHandler class implements the MessageListener interface by * defining an onMessage method for the AsyncTopicConsumerExample class. */ static class MessageHandler implements javax.jms.MessageListener { private CountDownLatch countDownLatch; private int msgsRecv; private int totalMsgs; MessageHandler(int noOfMsgs) { totalMsgs = noOfMsgs; countDownLatch = new CountDownLatch(1); } /** * Casts the message to a TextMessage and displays its text. * The message listener sets its CounDownLatch to all * done processing messages. * * @param message the incoming message */ public void onMessage(Message message) { //Receive messages TextMessage msg = (TextMessage) message; try { if(msg != null) { msgsRecv ++; // Get message body as String String body = msg.getBody(String.class); System.out.println("Message Received : "+body); } if ( msgsRecv == totalMsgs) { countDownLatch.countDown(); } } catch( JMSException ex) { System.out.println("Exception in onMessage(): " + ex.toString()); countDownLatch.countDown(); } } public void await() { try { countDownLatch.await(); } catch (InterruptedException e) { e.printStackTrace(); } } } }





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