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#ifndef QPID_BROKER_QUEUEEVENTS_H
#define QPID_BROKER_QUEUEEVENTS_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 "BrokerImportExport.h"
#include "QueuedMessage.h"
#include "qpid/sys/Mutex.h"
#include "qpid/sys/PollableQueue.h"
#include <map>
#include <string>
#include <boost/function.hpp>
namespace qpid {
namespace broker {
/**
* Event manager for queue events. Allows queues to indicate when
* events have occured; allows listeners to register for notification
* of this. The notification happens asynchronously, in a separate
* thread.
*/
class QueueEvents
{
public:
enum EventType {ENQUEUE, DEQUEUE};
struct Event
{
EventType type;
QueuedMessage msg;
QPID_BROKER_EXTERN Event(EventType, const QueuedMessage&);
};
typedef boost::function<void (Event)> EventListener;
QPID_BROKER_EXTERN QueueEvents(const boost::shared_ptr<sys::Poller>& poller);
QPID_BROKER_EXTERN ~QueueEvents();
QPID_BROKER_EXTERN void enqueued(const QueuedMessage&);
QPID_BROKER_EXTERN void dequeued(const QueuedMessage&);
QPID_BROKER_EXTERN void registerListener(const std::string& id,
const EventListener&);
QPID_BROKER_EXTERN void unregisterListener(const std::string& id);
void enable();
void disable();
//process all outstanding events
QPID_BROKER_EXTERN void shutdown();
private:
typedef qpid::sys::PollableQueue<Event> EventQueue;
typedef std::map<std::string, EventListener> Listeners;
EventQueue eventQueue;
Listeners listeners;
volatile bool enabled;
qpid::sys::Mutex lock;//protect listeners from concurrent access
void handle(EventQueue::Queue& e);
};
}} // namespace qpid::broker
#endif /*!QPID_BROKER_QUEUEEVENTS_H*/
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