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#ifndef QPID_BROKER_TRANSACTIONOBSERVER_H
#define QPID_BROKER_TRANSACTIONOBSERVER_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 "DeliveryRecord.h"
#include <boost/shared_ptr.hpp>
namespace qpid {
namespace framing {
class SequenceSet;
}
namespace broker {
class Queue;
class Message;
class TxBuffer;
class DtxBuffer;
/**
* Interface for intercepting events in a transaction.
*/
class TransactionObserver {
public:
typedef boost::shared_ptr<Queue> QueuePtr;
typedef framing::SequenceNumber SequenceNumber;
virtual ~TransactionObserver() {}
/** Message enqueued in the transaction. */
virtual void enqueue(const QueuePtr&, const Message&) = 0;
/**
* Message is dequeued in the transaction (it was accepted by a consumer.)
*@param queuePosition: Sequence number of message on queue.
*@param replicationId: Replication sequence number, may be different.
*/
virtual void dequeue(const QueuePtr& queue,
SequenceNumber queueSeq,
SequenceNumber replicationSeq) = 0;
virtual bool prepare() = 0;
virtual void commit() = 0;
virtual void rollback() = 0;
};
/**
* No-op TransactionObserver.
*/
class NullTransactionObserver : public TransactionObserver {
public:
void enqueue(const QueuePtr&, const Message&) {}
void dequeue(const QueuePtr&, SequenceNumber, SequenceNumber) {}
bool prepare() { return true; }
void commit() {}
void rollback() {}
};
}} // namespace qpid::broker
#endif /*!QPID_BROKER_TRANSACTIONOBSERVER_H*/
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