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PositionAwarePhysicalFlushableChannel.java
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PositionAwarePhysicalFlushableChannel.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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.transaction.log;
import java.io.Flushable;
import java.io.IOException;
/**
* Decorator around a {@link LogVersionedStoreChannel} making it expose {@link FlushablePositionAwareChannel}. This
* implementation uses a {@link PhysicalFlushableChannel}, which provides buffering for write operations over the
* decorated channel.
*/
public class PositionAwarePhysicalFlushableChannel implements FlushablePositionAwareChannel
{
private LogVersionedStoreChannel logVersionedStoreChannel;
private final PhysicalFlushableChannel channel;
public PositionAwarePhysicalFlushableChannel( LogVersionedStoreChannel logVersionedStoreChannel) {
this.logVersionedStoreChannel = logVersionedStoreChannel;
this.channel = new PhysicalFlushableChannel( logVersionedStoreChannel );
}
public PositionAwarePhysicalFlushableChannel( LogVersionedStoreChannel logVersionedStoreChannel, int bufferSize )
{
this.logVersionedStoreChannel = logVersionedStoreChannel;
this.channel = new PhysicalFlushableChannel( logVersionedStoreChannel, bufferSize );
}
@Override
public LogPositionMarker getCurrentPosition( LogPositionMarker positionMarker ) throws IOException
{
positionMarker.mark( logVersionedStoreChannel.getVersion(), channel.position() );
return positionMarker;
}
@Override
public Flushable prepareForFlush() throws IOException
{
return channel.prepareForFlush();
}
@Override
public FlushableChannel put( byte value ) throws IOException
{
return channel.put( value );
}
@Override
public FlushableChannel putShort( short value ) throws IOException
{
return channel.putShort( value );
}
@Override
public FlushableChannel putInt( int value ) throws IOException
{
return channel.putInt( value );
}
@Override
public FlushableChannel putLong( long value ) throws IOException
{
return channel.putLong( value );
}
@Override
public FlushableChannel putFloat( float value ) throws IOException
{
return channel.putFloat( value );
}
@Override
public FlushableChannel putDouble( double value ) throws IOException
{
return channel.putDouble( value );
}
@Override
public FlushableChannel put( byte[] value, int length ) throws IOException
{
return channel.put( value, length );
}
@Override
public void close() throws IOException
{
channel.close();
}
void setChannel( LogVersionedStoreChannel channel )
{
this.logVersionedStoreChannel = channel;
this.channel.setChannel( channel );
}
public void setCurrentPosition( LogPosition position ) throws IOException, UnsupportedOperationException
{
channel.position( position.getByteOffset() );
}
}