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SlaveTransactionCommitProcess.java
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SlaveTransactionCommitProcess.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.kernel.ha;
import java.io.IOException;
import org.neo4j.com.ComException;
import org.neo4j.com.RequestContext;
import org.neo4j.com.Response;
import org.neo4j.graphdb.TransientTransactionFailureException;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.ha.com.RequestContextFactory;
import org.neo4j.kernel.ha.com.master.Master;
import org.neo4j.kernel.impl.api.TransactionApplicationMode;
import org.neo4j.kernel.impl.api.TransactionCommitProcess;
import org.neo4j.kernel.impl.locking.LockGroup;
import org.neo4j.kernel.impl.transaction.TransactionRepresentation;
import org.neo4j.kernel.impl.transaction.tracing.CommitEvent;
/**
* Commit process on slaves in HA. Transactions aren't committed here, but sent to the master, committed
* there and streamed back. Look at {@link org.neo4j.com.storecopy.TransactionCommittingResponseUnpacker}
*/
public class SlaveTransactionCommitProcess implements TransactionCommitProcess
{
private final Master master;
private final RequestContextFactory requestContextFactory;
public SlaveTransactionCommitProcess( Master master, RequestContextFactory requestContextFactory )
{
this.master = master;
this.requestContextFactory = requestContextFactory;
}
@Override
public long commit( TransactionRepresentation representation, LockGroup locks, CommitEvent commitEvent,
TransactionApplicationMode mode ) throws TransactionFailureException
{
try
{
RequestContext context = requestContextFactory.newRequestContext( representation.getLockSessionId() );
try ( Response<Long> response = master.commit( context, representation ) )
{
return response.response();
}
}
catch ( IOException e )
{
throw new TransactionFailureException(
Status.Transaction.CouldNotCommit, e, "Could not commit transaction on the master" );
}
catch ( ComException e )
{
throw new TransientTransactionFailureException(
"Cannot commit this transaction on the master. " +
"The master is either down, or we have network connectivity problems.", e );
}
}
}