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Diffstat (limited to 'qpid/cpp/include/qpid/client/LocalQueue.h')
-rw-r--r-- | qpid/cpp/include/qpid/client/LocalQueue.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/qpid/cpp/include/qpid/client/LocalQueue.h b/qpid/cpp/include/qpid/client/LocalQueue.h new file mode 100644 index 0000000000..1a19a8499d --- /dev/null +++ b/qpid/cpp/include/qpid/client/LocalQueue.h @@ -0,0 +1,120 @@ +#ifndef QPID_CLIENT_LOCALQUEUE_H +#define QPID_CLIENT_LOCALQUEUE_H + +/* + * + * 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/client/ClientImportExport.h" +#include "qpid/client/Handle.h" +#include "qpid/client/Message.h" +#include "qpid/sys/Time.h" + +namespace qpid { +namespace client { + +class LocalQueueImpl; +template <class T> class PrivateImplRef; + +/** + * A local queue to collect messages retrieved from a remote broker + * queue. Create a queue and subscribe it using the SubscriptionManager. + * Messages from the remote queue on the broker will be stored in the + * local queue until you retrieve them. + * + * \ingroup clientapi + * + * \details Using a Local Queue + * + * <pre> + * LocalQueue local_queue; + * subscriptions.subscribe(local_queue, string("message_queue")); + * for (int i=0; i<10; i++) { + * Message message = local_queue.get(); + * std::cout << message.getData() << std::endl; + * } + * </pre> + * + * <h2>Getting Messages</h2> + * + * <ul><li> + * <p>get()</p> + * <pre>Message message = local_queue.get();</pre> + * <pre>// Specifying timeouts (TIME_SEC, TIME_MSEC, TIME_USEC, TIME_NSEC) + *#include <qpid/sys/Time.h> + *Message message; + *local_queue.get(message, 5*sys::TIME_SEC);</pre></li></ul> + * + * <h2>Checking size</h2> + * <ul><li> + * <p>empty()</p> + * <pre>if (local_queue.empty()) { ... }</pre></li> + * <li><p>size()</p> + * <pre>std::cout << local_queue.size();</pre></li> + * </ul> + */ + +class QPID_CLIENT_CLASS_EXTERN LocalQueue : public Handle<LocalQueueImpl> { + public: + /** Create a local queue. Subscribe the local queue to a remote broker + * queue with a SubscriptionManager. + * + * LocalQueue is an alternative to implementing a MessageListener. + */ + QPID_CLIENT_EXTERN LocalQueue(); + QPID_CLIENT_EXTERN LocalQueue(const LocalQueue&); + QPID_CLIENT_EXTERN ~LocalQueue(); + QPID_CLIENT_EXTERN LocalQueue& operator=(const LocalQueue&); + + /** Wait up to timeout for the next message from the local queue. + *@param result Set to the message from the queue. + *@param timeout wait up this timeout for a message to appear. + *@return true if result was set, false if queue was empty after timeout. + */ + QPID_CLIENT_EXTERN bool get(Message& result, sys::Duration timeout=0); + + /** Get the next message off the local queue, or wait up to the timeout + * for message from the broker queue. + *@param timeout wait up this timeout for a message to appear. + *@return message from the queue. + *@throw ClosedException if subscription is closed or timeout exceeded. + */ + QPID_CLIENT_EXTERN Message get(sys::Duration timeout=sys::TIME_INFINITE); + + /** Synonym for get() */ + QPID_CLIENT_EXTERN Message pop(sys::Duration timeout=sys::TIME_INFINITE); + + /** Return true if local queue is empty. */ + QPID_CLIENT_EXTERN bool empty() const; + + /** Number of messages on the local queue */ + QPID_CLIENT_EXTERN size_t size() const; + + LocalQueue(LocalQueueImpl*); ///<@internal + + + private: + typedef LocalQueueImpl Impl; + friend class PrivateImplRef<LocalQueue>; +}; + +}} // namespace qpid::client + +#endif /*!QPID_CLIENT_LOCALQUEUE_H*/ |