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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 "qpid/broker/BrokerImportExport.h"
+#include "qpid/broker/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, bool isSync = false);
+ 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();
+ void observe(Queue&, bool enqueueOnly);
+ //process all outstanding events
+ QPID_BROKER_EXTERN void shutdown();
+ QPID_BROKER_EXTERN bool isSync();
+ 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
+ bool sync;
+
+ EventQueue::Batch::const_iterator handle(const EventQueue::Batch& e);
+
+};
+}} // namespace qpid::broker
+
+#endif /*!QPID_BROKER_QUEUEEVENTS_H*/