examples/messaging/server_reconnect.cpp

/*
 *
 * 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.
 *
 */

#include <qpid/messaging/Address.h>
#include <qpid/messaging/Connection.h>
#include <qpid/messaging/exceptions.h>
#include <qpid/messaging/Message.h>
#include <qpid/messaging/Receiver.h>
#include <qpid/messaging/Sender.h>
#include <qpid/messaging/Session.h>

#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <memory>
#include <sstream>

using namespace qpid::messaging;

using std::stringstream;
using std::string;

int main(int argc, char** argv) {
    std::string url = argc>1 ? argv[1] : "amqp:tcp:127.0.0.1:5672";
    std::string connectionOptions = argc > 2 ? argv[2] : "";

    Connection connection(url, connectionOptions);
    try {
        connection.open();
        Session session = connection.createSession();
        Receiver receiver = session.createReceiver("service_queue; {create: always}");

        while (true) {
            try {
                if (!connection.isOpen()) {
                    // This demonstrates use of application controlled
                    // reconnect; the reconnect connection option may
                    // also be used to automatcially handle
                    // reconnection
                    if (url.empty()) {
                        connection.reconnect();
                    } else {
                        connection.reconnect(url);
                    }
                    std::cout << "Reconnected to " << connection.getUrl() << std::endl;
                }
                Message request = receiver.fetch();
                const Address& address = request.getReplyTo();
                if (address) {
                    Sender sender = session.createSender(address);
                    std::string s = request.getContent();
                    std::transform(s.begin(), s.end(), s.begin(), toupper);
                    Message response(s);
                    sender.send(response);
                    std::cout << "Processed request: "
                              << request.getContent()
                              << " -> "
                              << response.getContent() << std::endl;
                    session.acknowledge();
                    sender.close();
                } else {
                    std::cerr << "Error: no reply address specified for request: " << request.getContent() << std::endl;
                    session.reject(request);
                }
            } catch (const TransportFailure&) {
                std::cout << "Connection to broker was lost, please enter URL to reconnect to (or hit return to use original url):" << std::endl;
                if (!std::getline(std::cin, url)) {
                    return 1;
                }
            }
        }
        connection.close();
        return 0;
    } catch(const std::exception& error) {
        std::cout << error.what() << std::endl;
        connection.close();
    }
    return 1;
}