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#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*/
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