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Diffstat (limited to 'cpp/include/qpid/client/MessageListener.h')
-rw-r--r-- | cpp/include/qpid/client/MessageListener.h | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/cpp/include/qpid/client/MessageListener.h b/cpp/include/qpid/client/MessageListener.h new file mode 100644 index 0000000000..d200f8cf21 --- /dev/null +++ b/cpp/include/qpid/client/MessageListener.h @@ -0,0 +1,101 @@ +/* + * + * 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 <string> +#include "qpid/client/ClientImportExport.h" + +#ifndef _MessageListener_ +#define _MessageListener_ + +#include "qpid/client/Message.h" + +namespace qpid { +namespace client { + + /** + * Implement a subclass of MessageListener and subscribe it using + * the SubscriptionManager to receive messages. + * + * Another way to receive messages is by using a LocalQueue. + * + * \ingroup clientapi + * \details + * + * <h2>Using a MessageListener</h2> + * + * <ul> + * <li> + * <p>The received() function is called when a message arrives:</p> + * <pre>virtual void received(Message& message)=0;</pre> + * </li> + * <li> + * <p>Derive your own listener, implement the received() function:</p> + * <pre> + * 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()); + * } + * } + *</pre> + * <pre> + * SubscriptionManager subscriptions(session); + * + * // Create a listener and subscribe it to the queue named "message_queue" + * Listener listener(subscriptions); + * subscriptions.subscribe(listener, "message_queue"); + * + * // Receive messages until the subscription is cancelled + * // by Listener::received() + * subscriptions.run(); + * </pre> + * </li> + * </ul> + * + */ + + class MessageListener{ + public: + QPID_CLIENT_EXTERN virtual ~MessageListener(); + + /** Called for each message arriving from the broker. Override + * in your own subclass to process messages. + */ + virtual void received(Message& msg) = 0; + }; + +} +} + + +#endif |