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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 three programs designed to be used
* together. These programs do not specify the exchange type - the
* default exchange type is the direct exchange.
*
* declare_queues.cpp:
*
* Creates a queue on a broker, binding a routing key to route
* messages to that queue.
*
* direct_producer.cpp:
*
* Publishes to a broker, specifying a routing key.
*
* listener.cpp (this program):
*
* Reads from a queue on the broker using a message listener.
*
*/
#include <qpid/client/Dispatcher.h>
#include <qpid/client/Connection.h>
#include <qpid/client/Session.h>
#include <qpid/client/Message.h>
#include <qpid/client/MessageListener.h>
#include <unistd.h>
#include <cstdlib>
#include <iostream>
using namespace qpid::client;
using namespace qpid::framing;
class Listener : public MessageListener{
private:
std::string destination_name;
Dispatcher dispatcher;
public:
Listener(Session& session, string destination_name):
destination_name(destination_name),
dispatcher(session)
{};
virtual void listen();
virtual void received(Message& message);
~Listener() { };
};
void Listener::listen() {
std::cout << "Activating listener for: " <<destination_name << std::endl;
dispatcher.listen(destination_name, this);
// The following line gives up control
dispatcher.run();
}
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 " <<destination_name << std::endl;
dispatcher.stop();
}
}
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;
Message msg;
try {
connection.open(host, port);
Session session = connection.newSession();
//--------- Main body of program --------------------------------------------
// Subscribe to the queue, route it to a client destination for
// the listener. (The destination name merely identifies the
// destination in the listener, you can use any name as long as
// you use the same name for the listener).
session.messageSubscribe(arg::queue="message_queue", arg::destination="listener_destination");
//##############
session.messageFlow(arg::destination="listener_destination", arg::unit=0, arg::value=1);//messages ### Define a constant?
session.messageFlow(arg::destination="listener_destination", arg::unit=1, arg::value=0xFFFFFFFF);//bytes ###### Define a constant?
// Tell the listener to listen to the destination we just
// created above.
Listener listener(session, "listener_destination");
listener.listen();
//-----------------------------------------------------------------------------
connection.close();
return 0;
} catch(const std::exception& error) {
std::cout << error.what() << std::endl;
}
return 1;
}
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