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package org.apache.qpid.example.amqpexample.pubsub;
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
import java.nio.ByteBuffer;
import org.apache.qpid.api.Message;
import org.apache.qpid.nclient.Client;
import org.apache.qpid.nclient.Connection;
import org.apache.qpid.nclient.Session;
import org.apache.qpid.nclient.util.MessageListener;
import org.apache.qpid.nclient.util.MessagePartListenerAdapter;
import org.apache.qpid.transport.MessageCreditUnit;
import org.apache.qpid.transport.Option;
public class TopicListener implements MessageListener
{
boolean finish = false;
int count = 0;
public void onMessage(Message m)
{
String data = null;
try
{
ByteBuffer buf = m.readData();
byte[] b = new byte[buf.remaining()];
buf.get(b);
data = new String(b);
}
catch(Exception e)
{
System.out.print("Error reading message");
e.printStackTrace();
}
System.out.println("Message: " + data + " with routing_key " + m.getDeliveryProperties().getRoutingKey());
if (data != null && data.equals("That's all, folks!"))
{
count++;
if (count == 4){
finish = true;
}
}
}
public void prepareQueue(Session session,String queueName,String bindingKey)
{
session.queueDeclare(queueName, null, null, Option.EXCLUSIVE, Option.AUTO_DELETE);
session.exchangeBind(queueName, "amq.topic", bindingKey, null);
session.exchangeBind(queueName, "amq.topic", "control", null);
session.messageSubscribe(queueName,queueName,
Session.TRANSFER_CONFIRM_MODE_NOT_REQUIRED,
Session.TRANSFER_ACQUIRE_MODE_PRE_ACQUIRE,
new MessagePartListenerAdapter(this),
null, Option.NONE);
// issue credits
// XXX: need to be able to set to null
session.messageFlow(queueName, MessageCreditUnit.BYTE, Session.MESSAGE_FLOW_MAX_BYTES);
session.messageFlow(queueName, MessageCreditUnit.MESSAGE, 24);
}
public void cancelSubscription(Session session,String dest)
{
session.messageCancel(dest);
}
public boolean isFinished()
{
return finish;
}
public static void main(String[] args)
{
// Create connection
Connection con = Client.createConnection();
try
{
con.connect("localhost", 5672, "test", "guest", "guest");
}
catch(Exception e)
{
System.out.print("Error connecting to broker");
e.printStackTrace();
}
// Create session
Session session = con.createSession(0);
// Create an instance of the listener
TopicListener listener = new TopicListener();
listener.prepareQueue(session,"usa", "usa.#");
listener.prepareQueue(session,"europe", "europe.#");
listener.prepareQueue(session,"news", "#.news");
listener.prepareQueue(session,"weather", "#.weather");
// confirm completion
session.sync();
// check to see if we have received all the messages
while (!listener.isFinished()){}
System.out.println("Shutting down listener for listener_destination");
listener.cancelSubscription(session,"usa");
listener.cancelSubscription(session,"europe");
listener.cancelSubscription(session,"news");
listener.cancelSubscription(session,"weather");
//cleanup
session.sessionDetach(session.getName());
try
{
con.close();
}
catch(Exception e)
{
System.out.print("Error closing broker connection");
e.printStackTrace();
}
}
}
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