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/*
*
* 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.
*
*/
/**
* listener.cpp
*
* This program is one of two programs designed to be used
* together.
*
* fanout_producer.cpp
*
* Publishes messages to the "amq.fanout" exchange.
*
* listener.cpp (this program)
*
* Creates a private queue, binds it to the "amq.fanout"
* exchange, and reads messages from its queue as they
* arrive. Messages sent before the listener binds the queue are
* not received.
*
* Multiple listeners can run at the same time.
*
*/
#include <qpid/client/Connection.h>
#include <qpid/client/Session.h>
#include <qpid/client/Message.h>
#include <qpid/client/MessageListener.h>
#include <qpid/client/SubscriptionManager.h>
#include <cstdlib>
#include <iostream>
using namespace qpid::client;
using namespace qpid::framing;
class Listener : public MessageListener{
private:
SubscriptionManager& subscriptions;
public:
Listener(SubscriptionManager& subscriptions);
virtual void received(Message& message);
};
Listener::Listener(SubscriptionManager& subs) : subscriptions(subs)
{}
void Listener::received(Message& message) {
std::cout << "Message: " << message.getData() << std::endl;
if (message.getData() == "That's all, folks!") {
std::cout << "Shutting down listener for " << message.getDestination()
<< std::endl;
subscriptions.cancel(message.getDestination());
}
}
int main(int argc, char** argv) {
const char* host = argc>1 ? argv[1] : "127.0.0.1";
int port = argc>2 ? atoi(argv[2]) : 5672;
Connection connection;
try {
connection.open(host, port);
Session session = connection.newSession();
//--------- Main body of program --------------------------------------------
// Each client creates its own private queue, using the
// session id to guarantee a unique name. It then routes
// all messages from the fanout exchange to its own queue
// by binding to the queue.
//
// The binding specifies a binding key, but for a fanout
// exchange, the binding key is optional and is not used
// for routing decisions. It can be useful for tracking
// messages and routing in logs.
std::string myQueue=session.getId().getName();
session.queueDeclare(arg::queue=myQueue, arg::exclusive=true,
arg::autoDelete=true);
session.exchangeBind(arg::exchange="amq.fanout", arg::queue=myQueue, arg::bindingKey="my-key");
// Create a listener and subscribe it to my queue.
SubscriptionManager subscriptions(session);
Listener listener(subscriptions);
subscriptions.subscribe(listener, myQueue);
// Receive messages until the subscription is cancelled
// by Listener::received()
std::cout << "Listening" << std::endl;
subscriptions.run();
//---------------------------------------------------------------------------
connection.close();
return 0;
} catch(const std::exception& error) {
std::cout << error.what() << std::endl;
}
return 1;
}
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