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/*
*
* 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/QueueEvents.h"
#include "qpid/broker/Queue.h"
#include "qpid/broker/QueueObserver.h"
#include "qpid/Exception.h"
#include "qpid/log/Statement.h"
namespace qpid {
namespace broker {
QueueEvents::QueueEvents(const boost::shared_ptr<sys::Poller>& poller, bool isSync) :
eventQueue(boost::bind(&QueueEvents::handle, this, _1), poller), enabled(true), sync(isSync)
{
if (!sync) eventQueue.start();
}
QueueEvents::~QueueEvents()
{
if (!sync) eventQueue.stop();
}
void QueueEvents::enqueued(const QueuedMessage& m)
{
if (enabled) {
Event enq(ENQUEUE, m);
if (sync) {
for (Listeners::iterator j = listeners.begin(); j != listeners.end(); j++)
j->second(enq);
} else {
eventQueue.push(enq);
}
}
}
void QueueEvents::dequeued(const QueuedMessage& m)
{
if (enabled) {
Event deq(DEQUEUE, m);
if (sync) {
for (Listeners::iterator j = listeners.begin(); j != listeners.end(); j++)
j->second(deq);
} else {
eventQueue.push(Event(DEQUEUE, m));
}
}
}
void QueueEvents::registerListener(const std::string& id, const EventListener& listener)
{
qpid::sys::Mutex::ScopedLock l(lock);
if (listeners.find(id) == listeners.end()) {
listeners[id] = listener;
} else {
throw Exception(QPID_MSG("Event listener already registered for '" << id << "'"));
}
}
void QueueEvents::unregisterListener(const std::string& id)
{
qpid::sys::Mutex::ScopedLock l(lock);
if (listeners.find(id) == listeners.end()) {
throw Exception(QPID_MSG("No event listener registered for '" << id << "'"));
} else {
listeners.erase(id);
}
}
QueueEvents::EventQueue::Batch::const_iterator
QueueEvents::handle(const EventQueue::Batch& events) {
qpid::sys::Mutex::ScopedLock l(lock);
for (EventQueue::Batch::const_iterator i = events.begin(); i != events.end(); ++i) {
for (Listeners::iterator j = listeners.begin(); j != listeners.end(); j++) {
j->second(*i);
}
}
return events.end();
}
void QueueEvents::shutdown()
{
if (!sync && !eventQueue.empty() && !listeners.empty()) eventQueue.shutdown();
}
void QueueEvents::enable()
{
enabled = true;
QPID_LOG(debug, "Queue events enabled");
}
void QueueEvents::disable()
{
enabled = false;
QPID_LOG(debug, "Queue events disabled");
}
bool QueueEvents::isSync()
{
return sync;
}
class EventGenerator : public QueueObserver
{
public:
EventGenerator(QueueEvents& mgr, bool enqOnly) : manager(mgr), enqueueOnly(enqOnly) {}
void enqueued(const QueuedMessage& m)
{
manager.enqueued(m);
}
void dequeued(const QueuedMessage& m)
{
if (!enqueueOnly) manager.dequeued(m);
}
private:
QueueEvents& manager;
const bool enqueueOnly;
};
void QueueEvents::observe(Queue& queue, bool enqueueOnly)
{
boost::shared_ptr<QueueObserver> observer(new EventGenerator(*this, enqueueOnly));
queue.addObserver(observer);
}
QueueEvents::Event::Event(EventType t, const QueuedMessage& m) : type(t), msg(m) {}
}} // namespace qpid::broker
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