mq5.0-source.src.share.java.examples.jms20.syncqueue.SyncQueueConsumer Maven / Gradle / Ivy
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import javax.jms.*;
import java.io.Serializable;
/**
* The SyncQueueConsumer.class receives messages from
* a queue using synchronous message delivery.
*
* Run this program in conjunction with SendObjectMsgsToQueue.
* Specify a queue name on the command line when you run
* the program. By default, the program receives one message. Specify a number
* after the queue name to receive that number of messages.
*/
public class SyncQueueConsumer {
private String destName = null;
private int noOfMsgs;
static int exitcode = 0;
/**
* Main method.
*
* @param args the queue 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 SyncQueueConsumer []");
System.exit(1);
}
SyncQueueConsumer recvMsg = new SyncQueueConsumer();
recvMsg.parseArgs(args);
try {
// Receive messages from queue
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("Queue name is " + destName);
if (args.length == 2){
noOfMsgs = (new Integer(args[1])).intValue();
} else {
noOfMsgs = 1;
}
}
/**
* Receive object messages synchronously from the queue 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 queue
Queue queue = jmsContext.createQueue(destName);
System.out.println("Created queue successfully");
// Create consumer
JMSConsumer consumer = jmsContext.createConsumer(queue);
jmsContext.start();
// Receive msgs
for (int i = 0; i < noOfMsgs; i++) {
//Receive messages using receiveBody(Class c, long timeout)
MyObject payload = consumer.receiveBody(MyObject.class, 1000);
if( payload != null ) {
System.out.println("Message Received : "+payload.getValue());
} else {
System.out.println("Message not received");
exitcode=1;
break;
}
}
}
}
}