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package org.apache.qpid.example.amqpexample.direct;
/*
*
* 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;
/**
* This listens to messages on a queue and terminates
* when it sees the final message
*
*/
public class Listener implements MessageListener
{
boolean finish = false;
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);
if (data != null && data.equals("That's all, folks!"))
{
finish = true;
}
}
public boolean isFinished()
{
return finish;
}
/**
* This sends 10 messages to the
* amq.direct exchange using the
* routing key as "routing_key"
*
*/
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
Listener listener = new Listener();
// create a subscription
session.messageSubscribe("message_queue",
"listener_destination",
Session.TRANSFER_CONFIRM_MODE_NOT_REQUIRED,
Session.TRANSFER_ACQUIRE_MODE_PRE_ACQUIRE,
new MessagePartListenerAdapter(listener), null);
// issue credits
// XXX
session.messageFlow("listener_destination", MessageCreditUnit.BYTE, Session.MESSAGE_FLOW_MAX_BYTES);
session.messageFlow("listener_destination", MessageCreditUnit.MESSAGE, 11);
// 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");
session.messageCancel("listener_destination");
//cleanup
session.sessionDetach(session.getName());
try
{
con.close();
}
catch(Exception e)
{
System.out.print("Error closing broker connection");
e.printStackTrace();
}
}
}
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