/**
* Copyright (c) 2002-2011 "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 java.nio.channels.ReadableByteChannel;
import javax.transaction.TransactionManager;
import org.neo4j.kernel.ha.zookeeper.ZooKeeperException;
import org.neo4j.kernel.impl.transaction.TxManager;
import org.neo4j.kernel.impl.transaction.xaframework.LogBuffer;
import org.neo4j.kernel.impl.transaction.xaframework.TxIdGenerator;
import org.neo4j.kernel.impl.transaction.xaframework.TxIdGeneratorFactory;
import org.neo4j.kernel.impl.transaction.xaframework.XaDataSource;
public class SlaveTxIdGenerator implements TxIdGenerator
{
public static class SlaveTxIdGeneratorFactory implements TxIdGeneratorFactory
{
private final Broker broker;
private final ResponseReceiver receiver;
public SlaveTxIdGeneratorFactory( Broker broker, ResponseReceiver receiver )
{
this.broker = broker;
this.receiver = receiver;
}
public TxIdGenerator create( TransactionManager txManager )
{
return new SlaveTxIdGenerator( broker, receiver, txManager );
}
}
private final Broker broker;
private final ResponseReceiver receiver;
private final TxManager txManager;
public SlaveTxIdGenerator( Broker broker, ResponseReceiver receiver,
TransactionManager txManager )
{
this.broker = broker;
this.receiver = receiver;
this.txManager = (TxManager) txManager;
}
public long generate( final XaDataSource dataSource, final int identifier )
{
try
{
final int eventIdentifier = txManager.getEventIdentifier();
Response<Long> response = broker.getMaster().first().commitSingleResourceTransaction(
receiver.getSlaveContext( eventIdentifier ),
dataSource.getName(), new TxExtractor()
{
public void extract( LogBuffer buffer )
{
try
{
dataSource.getPreparedTransaction( identifier, buffer );
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
}
public ReadableByteChannel extract()
{
try
{
return dataSource.getPreparedTransaction( identifier );
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
}
});
return receiver.receive( response );
}
catch ( ZooKeeperException e )
{
receiver.newMaster( null, e );
throw e;
}
catch ( HaCommunicationException e )
{
receiver.newMaster( null, e );
throw e;
}
}
public int getCurrentMasterId()
{
return this.broker.getMaster().other().getMachineId();
}
}