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#ifndef QPID_HA_QUEUEREPLICATOR_H
#define QPID_HA_QUEUEREPLICATOR_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 "BrokerInfo.h"
#include "hash.h"
#include "qpid/broker/Exchange.h"
#include <boost/enable_shared_from_this.hpp>
#include <boost/function.hpp>
#include <iosfwd>
namespace qpid {
namespace broker {
class Bridge;
class Link;
class Queue;
class QueueRegistry;
class SessionHandler;
class Deliverable;
}
namespace ha {
class HaBroker;
class Settings;
/**
* Exchange created on a backup broker to replicate a queue on the primary.
*
* Puts replicated messages on the local queue, handles dequeue events.
* Creates a ReplicatingSubscription on the primary by passing special
* arguments to the consume command.
*
* THREAD SAFE: Called in different connection threads.
*/
class QueueReplicator : public broker::Exchange,
public boost::enable_shared_from_this<QueueReplicator>
{
public:
static const std::string QPID_SYNC_FREQUENCY;
static const std::string REPLICATOR_PREFIX;
static std::string replicatorName(const std::string& queueName);
static bool isReplicatorName(const std::string&);
QueueReplicator(HaBroker&,
boost::shared_ptr<broker::Queue> q,
boost::shared_ptr<broker::Link> l);
~QueueReplicator();
void activate(); // Must be called immediately after constructor.
std::string getType() const;
bool bind(boost::shared_ptr<broker::Queue
>, const std::string&, const framing::FieldTable*);
bool unbind(boost::shared_ptr<broker::Queue>, const std::string&, const framing::FieldTable*);
void route(broker::Deliverable&);
bool isBound(boost::shared_ptr<broker::Queue>, const std::string* const, const framing::FieldTable* const);
// Set if the queue has ever been subscribed to, used for auto-delete cleanup.
void setSubscribed() { subscribed = true; }
bool isSubscribed() { return subscribed; }
boost::shared_ptr<broker::Queue> getQueue() const { return queue; }
ReplicationId getMaxId();
protected:
typedef boost::function<void(const std::string&, sys::Mutex::ScopedLock&)> DispatchFn;
typedef qpid::sys::unordered_map<std::string, DispatchFn> DispatchMap;
virtual void deliver(const broker::Message&);
sys::Mutex lock;
HaBroker& haBroker;
const BrokerInfo brokerInfo;
DispatchMap dispatch;
private:
typedef qpid::sys::unordered_map<
ReplicationId, QueuePosition, TrivialHasher<int32_t> > PositionMap;
class ErrorListener;
class QueueObserver;
void initializeBridge(broker::Bridge& bridge, broker::SessionHandler& sessionHandler);
void destroy(); // Called when the queue is destroyed.
// Dispatch functions
void dequeueEvent(const std::string& data, sys::Mutex::ScopedLock&);
void idEvent(const std::string& data, sys::Mutex::ScopedLock&);
std::string logPrefix;
std::string bridgeName;
boost::shared_ptr<broker::Queue> queue;
boost::shared_ptr<broker::Link> link;
boost::shared_ptr<broker::Bridge> bridge;
bool subscribed;
const Settings& settings;
bool destroyed;
PositionMap positions;
ReplicationIdSet idSet; // Set of replicationIds on the queue.
ReplicationId nextId; // ID for next message to arrive.
ReplicationId maxId; // Max ID used so far.
};
}} // namespace qpid::ha
#endif /*!QPID_HA_QUEUEREPLICATOR_H*/
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