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ReplayableCommitProcess.java
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ReplayableCommitProcess.java
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/*
* Copyright (c) 2002-2015 "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.coreedge.raft.replication.tx;
import java.util.concurrent.atomic.AtomicLong;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.impl.api.TransactionApplicationMode;
import org.neo4j.kernel.impl.api.TransactionCommitProcess;
import org.neo4j.kernel.impl.api.TransactionToApply;
import org.neo4j.kernel.impl.transaction.tracing.CommitEvent;
/**
* Counts transactions, and only applies new transactions once it has already seen enough transactions to reproduce
* the current state of the store.
*/
public class ReplayableCommitProcess implements TransactionCommitProcess
{
private final AtomicLong lastLocalTxId = new AtomicLong( 1 );
private final TransactionCommitProcess localCommitProcess;
private final TransactionCounter transactionCounter;
public ReplayableCommitProcess( TransactionCommitProcess localCommitProcess, TransactionCounter transactionCounter )
{
this.localCommitProcess = localCommitProcess;
this.transactionCounter = transactionCounter;
}
@Override
public long commit( TransactionToApply batch,
CommitEvent commitEvent,
TransactionApplicationMode mode ) throws TransactionFailureException
{
long txId = lastLocalTxId.incrementAndGet();
if ( txId > transactionCounter.lastCommittedTransactionId() )
{
return localCommitProcess.commit( batch, commitEvent, mode );
}
return txId;
}
}