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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 "qpid/broker/SemanticState.h"
#include "qpid/broker/QueueObserver.h"
#include "qpid/broker/ConsumerFactory.h"
#include <iosfwd>
namespace qpid {
namespace broker {
class Message;
class Queue;
class QueuedMessage;
class OwnershipToken;
}
namespace framing {
class Buffer;
}
namespace ha {
/**
* A susbcription that represents a backup replicating a queue.
*
* Runs on the primary. Delays completion of messages till the backup
* has acknowledged, informs backup of locally dequeued messages.
*
* THREAD SAFE: Used as a consumer in subscription's connection
* thread, and as a QueueObserver in arbitrary connection threads.
*/
class ReplicatingSubscription : public broker::SemanticState::ConsumerImpl,
public broker::QueueObserver
{
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;
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();
void cancel();
bool deliver(broker::QueuedMessage& msg);
void enqueued(const broker::QueuedMessage&);
void dequeued(const broker::QueuedMessage&);
void acquired(const broker::QueuedMessage&) {}
void requeued(const broker::QueuedMessage&) {}
bool isDelayedCompletion() const { return true; }
protected:
bool doDispatch();
private:
std::string logPrefix;
boost::shared_ptr<broker::Queue> events;
boost::shared_ptr<broker::Consumer> consumer;
qpid::framing::SequenceSet dequeues;
framing::SequenceNumber backupPosition;
void sendDequeueEvent(const sys::Mutex::ScopedLock&);
void sendPositionEvent(framing::SequenceNumber, const sys::Mutex::ScopedLock&);
void sendEvent(const std::string& key, framing::Buffer&,
const sys::Mutex::ScopedLock&);
class DelegatingConsumer : public Consumer
{
public:
DelegatingConsumer(ReplicatingSubscription&);
~DelegatingConsumer();
bool deliver(broker::QueuedMessage& msg);
void notify();
bool filter(boost::intrusive_ptr<broker::Message>);
bool accept(boost::intrusive_ptr<broker::Message>);
void cancel();
bool isDelayedCompletion() const { return false; }
broker::OwnershipToken* getSession();
private:
ReplicatingSubscription& delegate;
};
};
}} // namespace qpid::broker
#endif /*!QPID_BROKER_REPLICATINGSUBSCRIPTION_H*/
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