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MasterTransactionCommitProcess.java
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MasterTransactionCommitProcess.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.ha;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.ha.transaction.TransactionPropagator;
import org.neo4j.kernel.impl.api.TransactionCommitProcess;
import org.neo4j.kernel.impl.api.TransactionToApply;
import org.neo4j.kernel.impl.transaction.state.IntegrityValidator;
import org.neo4j.kernel.impl.transaction.tracing.CommitEvent;
import org.neo4j.storageengine.api.TransactionApplicationMode;
/**
* Commit process on the master side in HA, where transactions either comes in from slaves committing,
* or gets created and committed directly on the master.
*/
public class MasterTransactionCommitProcess implements TransactionCommitProcess
{
private final TransactionCommitProcess inner;
private final TransactionPropagator txPropagator;
private final IntegrityValidator validator;
private final Monitor monitor;
public interface Monitor
{
void missedReplicas( int number );
}
public MasterTransactionCommitProcess( TransactionCommitProcess commitProcess, TransactionPropagator txPropagator,
IntegrityValidator validator, Monitor monitor )
{
this.inner = commitProcess;
this.txPropagator = txPropagator;
this.validator = validator;
this.monitor = monitor;
}
@Override
public long commit( TransactionToApply batch, CommitEvent commitEvent, TransactionApplicationMode mode )
throws TransactionFailureException
{
validate( batch );
long result = inner.commit( batch, commitEvent, mode );
// Assuming all the transactions come from the same author
int missedReplicas = txPropagator.committed( result, batch.transactionRepresentation().getAuthorId() );
if ( missedReplicas > 0 )
{
monitor.missedReplicas( missedReplicas );
}
return result;
}
private void validate( TransactionToApply batch ) throws TransactionFailureException
{
while ( batch != null )
{
validator.validateTransactionStartKnowledge(
batch.transactionRepresentation().getLatestCommittedTxWhenStarted() );
batch = batch.next();
}
}
}