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#ifndef QPID_BROKER_REPLICATINGSUBSCRIPTION_H
#define QPID_BROKER_REPLICATINGSUBSCRIPTION_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 "QueueReplicator.h" // For DEQUEUE_EVENT_KEY
#include "BrokerInfo.h"
#include "qpid/broker/SemanticState.h"
#include "qpid/broker/QueueObserver.h"
#include "qpid/broker/ConsumerFactory.h"
#include "qpid/types/Uuid.h"
#include <iosfwd>
namespace qpid {
namespace broker {
class Message;
class Queue;
struct QueuedMessage;
class OwnershipToken;
}
namespace framing {
class Buffer;
}
namespace ha {
class QueueGuard;
/**
* A susbcription that replicates to a remote backup.
*
* Runs on the primary. In conjunction with a QueueGuard, delays
* completion of messages till the backup has acknowledged, informs
* backup of locally dequeued messages.
*
* THREAD SAFE: Called in subscription's connection thread but also
* in arbitrary connection threads via dequeued.
*
* Lifecycle: broker::Queue holds shared_ptrs to this as a consumer.
*
*/
class ReplicatingSubscription : public broker::SemanticState::ConsumerImpl
{
public:
struct Factory : public broker::ConsumerFactory {
boost::shared_ptr<broker::SemanticState::ConsumerImpl> create(
broker::SemanticState* parent,
const std::string& name, boost::shared_ptr<broker::Queue> ,
bool ack, bool acquire, bool exclusive, const std::string& tag,
const std::string& resumeId, uint64_t resumeTtl,
const framing::FieldTable& arguments);
};
// Argument names for consume command.
static const std::string QPID_REPLICATING_SUBSCRIPTION;
static const std::string QPID_BACK;
static const std::string QPID_FRONT;
static const std::string QPID_BROKER_INFO;
// TODO aconway 2012-05-23: these don't belong on ReplicatingSubscription
/** Get position of front message on queue.
*@return false if queue is empty.
*/
static bool getFront(broker::Queue&, framing::SequenceNumber& result);
/** Get next message after from in queue.
*@return false if none found.
*/
static bool getNext(broker::Queue&, framing::SequenceNumber from,
framing::SequenceNumber& result);
static bool isEmpty(broker::Queue&);
ReplicatingSubscription(broker::SemanticState* parent,
const std::string& name, boost::shared_ptr<broker::Queue> ,
bool ack, bool acquire, bool exclusive, const std::string& tag,
const std::string& resumeId, uint64_t resumeTtl,
const framing::FieldTable& arguments);
~ReplicatingSubscription();
// Called via QueueGuard::dequeued
void dequeued(const broker::QueuedMessage& qm);
// Consumer overrides.
bool deliver(broker::QueuedMessage& msg);
void cancel();
void acknowledged(const broker::QueuedMessage&);
bool browseAcquired() const { return true; }
bool hideDeletedError();
/** Initialization that must be done after construction because it
* requires a shared_ptr to this to exist. Will attach to guard
*/
void initialize();
BrokerInfo getBrokerInfo() const { return info; }
protected:
bool doDispatch();
private:
std::string logPrefix;
boost::shared_ptr<broker::Queue> dummy; // Used to send event messages
framing::SequenceSet dequeues;
framing::SequenceNumber readyPosition;
framing::SequenceNumber backupPosition;
bool ready;
BrokerInfo info;
boost::shared_ptr<QueueGuard> guard;
void sendDequeueEvent(sys::Mutex::ScopedLock&);
void sendPositionEvent(framing::SequenceNumber, sys::Mutex::ScopedLock&);
void setReady(sys::Mutex::ScopedLock&);
void sendEvent(const std::string& key, framing::Buffer&);
friend struct Factory;
};
}} // namespace qpid::broker
#endif /*!QPID_BROKER_REPLICATINGSUBSCRIPTION_H*/
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