| #ifndef QPID_BROKER_QUEUELISTENERS_H |
| #define QPID_BROKER_QUEUELISTENERS_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/broker/Consumer.h" |
| #include <deque> |
| |
| namespace qpid { |
| namespace broker { |
| |
| /** |
| * Track and notify components that wish to be notified of messages |
| * that become available on a queue. |
| * |
| * None of the methods defined here are protected by locking. However |
| * the populate method allows a 'snapshot' to be taken of the |
| * listeners to be notified. NotificationSet::notify() may then be |
| * called outside of any lock that protects the QueueListeners |
| * instance from concurrent access. |
| */ |
| class QueueListeners |
| { |
| public: |
| typedef std::deque<Consumer::shared_ptr> Listeners; |
| |
| class NotificationSet |
| { |
| public: |
| void notify(); |
| private: |
| Listeners browsers; |
| Consumer::shared_ptr consumer; |
| friend class QueueListeners; |
| }; |
| |
| class ListenerSet |
| { |
| public: |
| void notifyAll(); |
| private: |
| Listeners listeners; |
| friend class QueueListeners; |
| }; |
| |
| void addListener(Consumer::shared_ptr); |
| void removeListener(Consumer::shared_ptr); |
| void populate(NotificationSet&); |
| void snapshot(ListenerSet&); |
| bool contains(Consumer::shared_ptr c) const; |
| void notifyAll(); |
| |
| template <class F> void eachListener(F f) { |
| std::for_each(browsers.begin(), browsers.end(), f); |
| std::for_each(consumers.begin(), consumers.end(), f); |
| } |
| |
| private: |
| Listeners consumers; |
| Listeners browsers; |
| |
| void add(Listeners&, Consumer::shared_ptr); |
| void remove(Listeners&, Consumer::shared_ptr); |
| |
| }; |
| }} // namespace qpid::broker |
| |
| #endif /*!QPID_BROKER_QUEUELISTENERS_H*/ |