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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.
*
*/
/**
* topic_publisher.cpp:
*
* This program is one of two programs designed to be used
* together. These programs implement a publish-subscribe example
* using the "amq.topic" exchange.
*
* topic_publisher.cpp (this program)
*
* Sends messages to the "amq.topic" exchange, using the
* multipart routing keys "usa.news", "usa.weather",
* "europe.news", and "europe.weather".
*
* topic_listener.cpp
*
* Creates private queues for "news", "weather", "usa", and
* "europe", binding them to the amq.topic exchange using
* bindings that match the corresponding parts of the multipart
* routing keys.
*
* Multiple listeners can be run at the same time.
*
*/
#include <qpid/client/Connection.h>
#include <qpid/client/Session.h>
#include <qpid/client/AsyncSession.h>
#include <qpid/client/Message.h>
#include <unistd.h>
#include <cstdlib>
#include <iostream>
#include <sstream>
using namespace qpid::client;
using namespace qpid::framing;
using std::stringstream;
using std::string;
void publish_messages(Session& session, string routing_key)
{
Message message;
// Set the routing key once, we'll use the same routing key for all
// messages.
message.getDeliveryProperties().setRoutingKey(routing_key);
for (int i=0; i<5; i++) {
stringstream message_data;
message_data << "Message " << i;
message.setData(message_data.str());
// Asynchronous transfer sends messages as quickly as
// possible without waiting for confirmation.
async(session).messageTransfer(arg::content=message, arg::destination="amq.topic");
}
}
/*
* no_more_messages()
*
* Send a message to indicate that no more messages are coming.
* Use the 'control' routing key (see comments in topic_config_queues.cpp).
*
*/
void no_more_messages(Session& session)
{
Message message;
message.getDeliveryProperties().setRoutingKey("control");
message.setData("That's all, folks!");
session.messageTransfer(arg::content=message, arg::destination="amq.topic");
}
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 --------------------------------------------
publish_messages(session, "usa.news");
publish_messages(session, "usa.weather");
publish_messages(session, "europe.news");
publish_messages(session, "europe.weather");
no_more_messages(session);
//-----------------------------------------------------------------------------
connection.close();
return 0;
} catch(const std::exception& error) {
std::cout << error.what() << std::endl;
}
return 1;
}
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