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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_listener.cpp:
+ *
+ * This program is one of three programs designed to be used
+ * together. These programs use the topic exchange.
+ *
+ * topic_config_queues.cpp:
+ *
+ * Creates a queue on a broker, binding a routing key to route
+ * messages to that queue.
+ *
+ * topic_publisher.cpp:
+ *
+ * Publishes to a broker, specifying a routing key.
+ *
+ * topic_listener.cpp (this program):
+ *
+ * Reads from a queue on the broker using a message listener.
+ *
+ */
+
+#include <qpid/client/Connection.h>
+#include <qpid/client/Session.h>
+#include <qpid/client/Message.h>
+#include <qpid/client/MessageListener.h>
+#include <qpid/client/Queue.h>
+#include <qpid/client/SubscriptionManager.h>
+
+#include <unistd.h>
+#include <cstdlib>
+#include <iostream>
+#include <set>
+
+using namespace qpid::client;
+using namespace qpid::framing;
+
+
+class Listener : public MessageListener {
+ private:
+ Session& session;
+ SubscriptionManager subscriptions;
+ public:
+ Listener(Session& session);
+ virtual void prepareQueue(std::string queue, std::string routing_key);
+ virtual void received(Message& message);
+ virtual void listen();
+ ~Listener() { };
+};
+
+
+/*
+ * Listener::Listener
+ *
+ * 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).
+ */
+
+Listener::Listener(Session& session) :
+ session(session),
+ subscriptions(session)
+{
+}
+
+
+void Listener::prepareQueue(std::string queue, std::string routing_key) {
+
+ /* Create a unique queue name for this consumer by concatenating
+ * the queue name parameter with the Session ID.
+ */
+
+ queue += session.getId().str();
+ std::cout << "Declaring queue: " << queue << std::endl;
+
+ /* Declare an exclusive queue on the broker
+ */
+
+ session.queueDeclare(arg::queue=queue, arg::exclusive=true);
+
+ /* Route messages to the new queue if they match the routing key.
+ *
+ * Also route any messages to with the "control" routing key to
+ * this queue so we know when it's time to stop. A publisher sends
+ * a message with the content "That's all, Folks!", using the
+ * "control" routing key, when it is finished.
+ */
+
+ session.queueBind(arg::exchange="amq.topic", arg::queue=queue, arg::routingKey=routing_key);
+ session.queueBind(arg::exchange="amq.topic", arg::queue=queue, arg::routingKey="control");
+
+ /*
+ * subscribe to the queue using the subscription manager.
+ */
+
+ std::cout << "Subscribing to queue " << queue << std::endl;
+ subscriptions.subscribe(*this, queue);
+}
+
+void Listener::received(Message& message) {
+ std::cout << "Message: " << message.getData() << " from " << message.getDestination() << std::endl;
+
+ if (message.getData() == "That's all, folks!") {
+ std::cout << "Shutting down listener for " << message.getDestination() << std::endl;
+ subscriptions.cancel(message.getDestination());
+ }
+}
+
+void Listener::listen() {
+ // Receive messages
+ subscriptions.run();
+}
+
+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(ASYNC);
+
+ //--------- Main body of program --------------------------------------------
+
+ // Create a listener for the session
+
+ Listener listener(session);
+
+ // Subscribe to messages on the queues we are interested in
+
+ listener.prepareQueue("usa", "usa.#");
+ listener.prepareQueue("europe", "europe.#");
+ listener.prepareQueue("news", "#.news");
+ listener.prepareQueue("weather", "#.weather");
+
+ // Wait for the broker to indicate that our queues have been created.
+ session.sync();
+
+ std::cout << "Listening for messages ..." << std::endl;
+
+ // Give up control and receive messages
+ listener.listen();
+
+
+ //-----------------------------------------------------------------------------
+
+ connection.close();
+ return 0;
+ } catch(const std::exception& error) {
+ std::cout << error.what() << std::endl;
+ }
+ return 1;
+}
+
+