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ReplicatedTransactionCommitProcess.java
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ReplicatedTransactionCommitProcess.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.coreedge.raft.replication.tx;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.neo4j.coreedge.catchup.tx.core.TxRetryMonitor;
import org.neo4j.coreedge.raft.replication.Replicator;
import org.neo4j.coreedge.raft.replication.Replicator.ReplicationFailedException;
import org.neo4j.coreedge.raft.replication.session.LocalSessionPool;
import org.neo4j.coreedge.raft.replication.session.OperationContext;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.impl.api.TransactionCommitProcess;
import org.neo4j.kernel.impl.api.TransactionToApply;
import org.neo4j.kernel.impl.logging.LogService;
import org.neo4j.kernel.impl.transaction.tracing.CommitEvent;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.logging.Log;
import org.neo4j.storageengine.api.TransactionApplicationMode;
import static org.neo4j.coreedge.raft.replication.tx.ReplicatedTransactionFactory.createImmutableReplicatedTransaction;
import static org.neo4j.kernel.api.exceptions.Status.Transaction.CouldNotCommit;
public class ReplicatedTransactionCommitProcess extends LifecycleAdapter implements TransactionCommitProcess
{
private final Replicator replicator;
private final Replicator.ReplicatedContentListener replicatedTxListener;
private final long retryIntervalMillis;
private final LocalSessionPool sessionPool;
private final Log log;
private final CommittingTransactions txFutures;
private final TxRetryMonitor txRetryMonitor;
public ReplicatedTransactionCommitProcess( Replicator replicator, LocalSessionPool sessionPool,
Replicator.ReplicatedContentListener replicatedTxListener,
long retryIntervalMillis, LogService logging,
CommittingTransactions txFutures, Monitors monitors)
{
this.sessionPool = sessionPool;
this.replicatedTxListener = replicatedTxListener;
this.replicator = replicator;
this.retryIntervalMillis = retryIntervalMillis;
this.log = logging.getInternalLog( getClass() );
this.txFutures = txFutures;
txRetryMonitor = monitors.newMonitor( TxRetryMonitor.class );
replicator.subscribe( this.replicatedTxListener );
}
@Override
public long commit( final TransactionToApply tx,
final CommitEvent commitEvent,
TransactionApplicationMode mode ) throws TransactionFailureException
{
OperationContext operationContext = sessionPool.acquireSession();
ReplicatedTransaction transaction;
try
{
transaction = createImmutableReplicatedTransaction( tx.transactionRepresentation(),
operationContext.globalSession(), operationContext.localOperationId() );
}
catch ( IOException e )
{
throw new TransactionFailureException( "Could not create immutable transaction for replication", e );
}
boolean hasNeverReplicated = true;
boolean interrupted = false;
try ( CommittingTransaction futureTxId = txFutures.register( operationContext.localOperationId() ) )
{
while ( true )
{
try
{
replicator.replicate( transaction );
hasNeverReplicated = false;
}
catch ( ReplicationFailedException e )
{
if ( hasNeverReplicated )
{
throw new TransactionFailureException( CouldNotCommit, "Failed to replicate transaction", e );
}
log.warn( "Transaction replication failed, but a previous attempt may have succeeded," +
"so commit process must keep waiting for possible success.", e );
txRetryMonitor.retry();
}
try
{
Long txId = futureTxId.waitUntilCommitted( retryIntervalMillis, TimeUnit.MILLISECONDS );
sessionPool.releaseSession( operationContext );
return txId;
}
catch ( InterruptedException e )
{
interrupted = true;
log.info( "Replication of %s was interrupted; retrying.", operationContext );
txRetryMonitor.retry();
}
catch ( TimeoutException e )
{
log.info( "Replication of %s timed out after %d %s; retrying.",
operationContext, retryIntervalMillis, TimeUnit.MILLISECONDS );
txRetryMonitor.retry();
}
}
}
finally
{
if ( interrupted )
{
Thread.currentThread().interrupt();
}
}
}
@Override
public void stop()
{
replicator.unsubscribe( replicatedTxListener );
}
}