mq5.0-source.src.share.java.examples.jms20.sharedsub.SharedDuraConsumerExample Maven / Gradle / Ivy
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import java.util.*;
import javax.jms.*;
/**
* The SharedDuraConsumerExample class demonstrates
* the use of multiple dura subscribers
* sharing messages that are published.
*
* The program contains a Subscriber class,
* a main method, and a method that runs the subscriber
* threads.
*
* The program creates two instances of the Subscriber class
* that displays the messages that
* the shared durable subscribers receive. Because all the
* objects run in threads, the displays are interspersed when the program runs.
*
* Specify a topic name & no of msgs on the command line when you run the program.
*/
public class SharedDuraConsumerExample {
static int exitcode = 0;
private String destName = null;
private int noOfMsgs;
static int msgsReceived = 0;
static boolean doneSignal = false;
/**
* Reads the topic name from the command line, then calls the
* run_threads method to execute the program threads.
*
* @param args the topic used by the example
*/
public static void main(String[] args) {
if ( (args.length < 1) || (args.length > 2) ) {
System.out.println("Usage: java SharedDuraConsumerExample []");
System.exit(1);
}
SharedDuraConsumerExample receiveMsg = new SharedDuraConsumerExample();
receiveMsg.parseArgs(args);
try {
// Receive messages from topic
receiveMsg.run_threads();
}catch(Exception 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;
}
}
/**
* Each instance of the Subscriber class creates a subscriber.
* It receives messages using receive(timeout).
* It does not exit till the both subscribers get messages.
*/
public class Subscriber extends Thread {
int subscriberNumber;
/**
* Constructor.
* subscriberNumber based on Subscriber array index.
*
* @param num the index of the Subscriber array
*/
public Subscriber(int num) {
subscriberNumber = num + 1;
}
/**
* Runs the thread.
*/
public void run() {
ConnectionFactory connectionFactory = null;
JMSContext context = null;
Topic topic = null;
String selector = null;
JMSConsumer msgConsumer = null;
connectionFactory =
new com.sun.messaging.ConnectionFactory();
try {
context =
connectionFactory.createContext();
topic = context.createTopic(destName);
/*
* Create durable subscriber with shared subscription name.
* Start message delivery.
* Wait till all messages have arrived.
*/
msgConsumer =
context.createSharedDurableConsumer(topic,"durasubid");
context.start();
/*
* Start receiving messages
* Block until all subscribers receive msgs.
*/
while(!doneSignal) {
TextMessage txtMsg = (TextMessage) msgConsumer.receive(15000);
if((txtMsg == null) && (doneSignal = true)) {
break;
}
if(txtMsg != null) {
System.out.println("SUBSCRIBER " + subscriberNumber
+ " : Message received: "
+ txtMsg.getText());
msgsReceived++;
} else {
System.out.println("SUBSCRIBER " + subscriberNumber
+ " : No message received");
break;
}
if ( msgsReceived == noOfMsgs)
{
System.out.println("Received all messages");
doneSignal = true;
}
}
} catch (Exception e) {
System.out.println("Exception occurred: " + e.toString());
exitcode = 1;
} finally {
if( context != null) {
context.close();
}
}
}
}
/**
* Creates an array of Subscriber objects and starts their threads.
* Calls the join method to wait for the threads to die.
*/
public void run_threads() {
final int NUM_SUBSCRIBERS = 2;
Subscriber subscriberArray[] = new Subscriber[NUM_SUBSCRIBERS];
subscriberArray[0] = new Subscriber(0);
subscriberArray[0].start();
subscriberArray[1] = new Subscriber(1);
subscriberArray[1].start();
for (int i = 0; i < subscriberArray.length; i++) {
try {
subscriberArray[i].join();
} catch (InterruptedException e) {}
}
}
}