Rob Davies wrote:
On 14 Sep 2009, at 00:00, czy11421 wrote:
Rob Davies wrote:
On 13 Sep 2009, at 20:03, czy11421 wrote:
Rob Davies wrote:
On 13 Sep 2009, at 17:55, czy11421 wrote:
Rob,
Thanks for your reply.
Here is another question. If I use MessageListener, how could I
start to receive message ? Coding as below, the Listener will NOT
output message. Did I miss something ?
Thanks.
Edward
//---------------------------------
session = conn.createTopicSession(false,
TopicSession.AUTO_ACKNOWLEDGE);
javax.jms.Topic mytopic =
session.createTopic("STOCKS.SUNW");
Test2.MyListener listener = new Test2.MyListener();
javax.jms.TopicSubscriber subscriber =
session.createSubscriber(mytopic);
/** == works
while(true){
Message message = subscriber.receive();
TextMessage text = (TextMessage) message;
System.out.println(text.getText());
Thread.sleep(1000);
}
**/
subscriber.setMessageListener(listener);
//-------------------------------------------
//-----------------------------------
static class MyListener implements MessageListener {
public void onMessage(Message message) {
System.out.println("Message: ");
TextMessage text = (TextMessage) message;
try {
System.out.println("Message: " + text.getText());
} catch (Exception e) {
e.printStackTrace();
}
}
}
//-----------------------------------
You shouldn't set the listener on the same subscriber after
calling receive() - its best to create a new session for each new
subscriber
cheers,
Rob
Rob Davies
twitter.com/rajdavies
I work here: http://fusesource.com
My Blog: http://rajdavies.blogspot.com/
I'm writing this: http://www.manning.com/snyder/
Rob,
Thanks. I did not "set the listener on the same subscriber after
calling receive()", as you see, the coding has been commented out.
If I use while(true){...}, it will work, but I switch to
MessageListener, it can't output received message .
Thanks.
Edward
Hi Edward,
thats very strange - and certainly not normal behaviour - could you
send a test case - to replicate what you are doing ?
cheers,
Rob
Rob Davies
http://twitter.com/rajdavies
I work here: http://fusesource.com
My Blog: http://rajdavies.blogspot.com/
I'm writing this: http://www.manning.com/snyder/
Hi, Rob,
The coding is below. The topic is using Market Data demo shipped with
ActiveMQ.
Thanks.
Edward
///////////////////////
package com;
import java.util.Properties;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;
import javax.jms.TopicSession;
import javax.naming.Context;
import javax.naming.InitialContext;
public class Test2 {
static javax.jms.TopicConnection conn;
static javax.jms.TopicSession session;
static class MyListener implements MessageListener {
public void onMessage(Message message) {
System.out.println("Message: ");
TextMessage text = (TextMessage) message;
try {
System.out.println("Message: " + text.getText());
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void main(String[] aaa) throws Exception {
try {
Properties props = new Properties();
props.setProperty(Context.INITIAL_CONTEXT_FACTORY,
"org.apache.activemq.jndi.ActiveMQInitialContextFactory");
props.setProperty(Context.PROVIDER_URL,
"tcp://localhost:61616");
javax.naming.Context ctx = new InitialContext(props);
// lookup the connection factory
javax.jms.TopicConnectionFactory factory =
(javax.jms.TopicConnectionFactory) ctx.lookup("ConnectionFactory");
conn = factory.createTopicConnection();
System.out.println(conn);
conn.start();
session = conn.createTopicSession(false,
TopicSession.AUTO_ACKNOWLEDGE);
javax.jms.Topic mytopic = session.createTopic("STOCKS.SUNW");
Test2.MyListener listener = new Test2.MyListener();
javax.jms.TopicSubscriber subscriber =
session.createSubscriber(mytopic);
/** == works
while(true){
Message message = subscriber.receive();
TextMessage text = (TextMessage) message;
System.out.println(text.getText());
Thread.sleep(1000);
}
**/
subscriber.setMessageListener(listener);
} catch (Exception e) {
e.printStackTrace();
} finally {
session.close();
conn.close();
}
}
}
/////////////////////////
Hi Edward,
you need to put a long sleep at the end of the main method - as all
the threads are daemon threads - there has to be a least one
application thread running
cheers,
Rob
Rob Davies
http://twitter.com/rajdavies
I work here: http://fusesource.com
My Blog: http://rajdavies.blogspot.com/
I'm writing this: http://www.manning.com/snyder/
Hi, Rob,
Oh,yes, at least I need to keep main thread alive.I fix it, it works
now. Learned a lot from you. Thanks.
Edward.
