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#ifndef QPID_HA_IDSETTER_H
#define QPID_HA_IDSETTER_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 "types.h"
#include "qpid/broker/Message.h"
#include "qpid/broker/MessageInterceptor.h"
#include "qpid/log/Statement.h"
#include "qpid/sys/Mutex.h"
#include "qpid/sys/AtomicValue.h"
namespace qpid {
namespace ha {
class LogPrefix;
/**
* A MessageInterceptor that sets the ReplicationId on each message as it is
* enqueued on a primary queue.
*
* THREAD UNSAFE: Called sequentially under the queue lock.
*/
class IdSetter : public broker::MessageInterceptor
{
public:
IdSetter(const LogPrefix& lp, const std::string& q, ReplicationId firstId=1) :
logPrefix(lp), queue(q), nextId(firstId)
{}
void record(broker::Message& m) {
// Record is called when a message is first delivered to a queue, before it has
// been enqueued or saved in a transaction buffer. This is when we normally want
// to assign a replication-id.
m.setReplicationId(nextId++);
}
void publish(broker::Message& m) {
// Publish is called when a message is assigned a position on the queue,
// after any transaction has comitted. Normally this is too late to
// assign a replication-id but during broker start-up and recovery from
// store record() is not called, so set the ID now if not already set.
if (!m.hasReplicationId()) {
m.setReplicationId(nextId++);
}
}
private:
const LogPrefix& logPrefix;
std::string queue;
sys::AtomicValue<uint32_t> nextId;
};
}} // namespace qpid::ha
#endif /*!QPID_HA_IDSETTER_H*/
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