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.
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*/
import java.nio.ByteBuffer;
import org.apache.qpid.transport.Connection;
import org.apache.qpid.transport.DeliveryProperties;
import org.apache.qpid.transport.MessageAcceptMode;
import org.apache.qpid.transport.MessageAcquireMode;
import org.apache.qpid.transport.MessageCreditUnit;
import org.apache.qpid.transport.MessageTransfer;
import org.apache.qpid.transport.Option;
import org.apache.qpid.transport.Session;
import org.apache.qpid.transport.SessionException;
import org.apache.qpid.transport.SessionListener;
public class TopicListener implements SessionListener
{
public void opened(Session ssn) {}
public void message(Session ssn, MessageTransfer xfr)
{
DeliveryProperties dp = xfr.getHeader().get(DeliveryProperties.class);
System.out.println("Message: " + xfr + " with routing_key " + dp.getRoutingKey());
}
public void exception(Session ssn, SessionException exc)
{
exc.printStackTrace();
}
public void closed(Session ssn) {}
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,
MessageAcceptMode.NONE,
MessageAcquireMode.PRE_ACQUIRED,
null, 0, null);
// issue credits
// XXX: need to be able to set to null
session.messageFlow(queueName, MessageCreditUnit.BYTE, Session.UNLIMITED_CREDIT);
session.messageFlow(queueName, MessageCreditUnit.MESSAGE, 24);
}
public void cancelSubscription(Session session,String dest)
{
session.messageCancel(dest);
}
public static void main(String[] args) throws InterruptedException
{
// Create connection
Connection con = new Connection();
con.connect("localhost", 5672, "test", "guest", "guest",false);
// Create session
Session session = con.createSession(0);
// Create an instance of the listener
TopicListener listener = new TopicListener();
session.setSessionListener(listener);
listener.prepareQueue(session,"usa", "usa.#");
listener.prepareQueue(session,"europe", "europe.#");
listener.prepareQueue(session,"news", "#.news");
listener.prepareQueue(session,"weather", "#.weather");
// confirm completion
session.sync();
System.out.println("Waiting 100 seconds for messages");
Thread.sleep(100*1000);
System.out.println("Shutting down listeners");
listener.cancelSubscription(session,"usa");
listener.cancelSubscription(session,"europe");
listener.cancelSubscription(session,"news");
listener.cancelSubscription(session,"weather");
//cleanup
session.close();
con.close();
}
}