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JumpingFileSystemAbstraction.java
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JumpingFileSystemAbstraction.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.core;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import org.neo4j.graphdb.factory.GraphDatabaseSettings;
import org.neo4j.graphdb.mockfs.DelegatingFileSystemAbstraction;
import org.neo4j.graphdb.mockfs.EphemeralFileSystemAbstraction;
import org.neo4j.io.fs.StoreChannel;
import org.neo4j.io.fs.StoreFileChannel;
import org.neo4j.kernel.impl.store.SchemaStore;
import org.neo4j.kernel.impl.store.format.standard.DynamicRecordFormat;
import org.neo4j.kernel.impl.store.format.standard.NodeRecordFormat;
import org.neo4j.kernel.impl.store.format.standard.PropertyRecordFormat;
import org.neo4j.kernel.impl.store.format.standard.RelationshipGroupRecordFormat;
import org.neo4j.kernel.impl.store.format.standard.RelationshipRecordFormat;
import org.neo4j.test.impl.ChannelInputStream;
import org.neo4j.test.impl.ChannelOutputStream;
public class JumpingFileSystemAbstraction extends DelegatingFileSystemAbstraction
{
private final EphemeralFileSystemAbstraction ephemeralFileSystem;
private final int sizePerJump;
public JumpingFileSystemAbstraction( int sizePerJump )
{
this( new EphemeralFileSystemAbstraction(), sizePerJump );
}
private JumpingFileSystemAbstraction( EphemeralFileSystemAbstraction ephemeralFileSystem, int sizePerJump )
{
super( ephemeralFileSystem );
this.ephemeralFileSystem = ephemeralFileSystem;
this.sizePerJump = sizePerJump;
}
@Override
public StoreChannel open( File fileName, String mode ) throws IOException
{
StoreFileChannel channel = (StoreFileChannel) super.open( fileName, mode );
if (
fileName.getName().equals( "neostore.nodestore.db" ) ||
fileName.getName().equals( "neostore.nodestore.db.labels" ) ||
fileName.getName().equals( "neostore.relationshipstore.db" ) ||
fileName.getName().equals( "neostore.propertystore.db" ) ||
fileName.getName().equals( "neostore.propertystore.db.strings" ) ||
fileName.getName().equals( "neostore.propertystore.db.arrays" ) ||
fileName.getName().equals( "neostore.relationshipgroupstore.db" ) )
{
return new JumpingFileChannel( channel, recordSizeFor( fileName ) );
}
return channel;
}
@Override
public OutputStream openAsOutputStream( File fileName, boolean append ) throws IOException
{
return new ChannelOutputStream( open( fileName, "rw" ), append );
}
@Override
public InputStream openAsInputStream( File fileName ) throws IOException
{
return new ChannelInputStream( open( fileName, "r" ) );
}
@Override
public Reader openAsReader( File fileName, Charset charset ) throws IOException
{
return new InputStreamReader( openAsInputStream( fileName ), charset );
}
@Override
public Writer openAsWriter( File fileName, Charset charset, boolean append ) throws IOException
{
return new OutputStreamWriter( openAsOutputStream( fileName, append ), charset );
}
@Override
public StoreChannel create( File fileName ) throws IOException
{
return open( fileName, "rw" );
}
public static int getRecordSize( int dataSize )
{
return dataSize + DynamicRecordFormat.RECORD_HEADER_SIZE;
}
private int recordSizeFor( File fileName )
{
if ( fileName.getName().endsWith( "nodestore.db" ) )
{
return NodeRecordFormat.RECORD_SIZE;
}
else if ( fileName.getName().endsWith( "relationshipstore.db" ) )
{
return RelationshipRecordFormat.RECORD_SIZE;
}
else if ( fileName.getName().endsWith( "propertystore.db.strings" ) ||
fileName.getName().endsWith( "propertystore.db.arrays" ) )
{
return getRecordSize( PropertyRecordFormat.DEFAULT_DATA_BLOCK_SIZE );
}
else if ( fileName.getName().endsWith( "propertystore.db" ) )
{
return PropertyRecordFormat.RECORD_SIZE;
}
else if ( fileName.getName().endsWith( "nodestore.db.labels" ) )
{
return Integer.parseInt( GraphDatabaseSettings.label_block_size.getDefaultValue() ) +
DynamicRecordFormat.RECORD_HEADER_SIZE;
}
else if ( fileName.getName().endsWith( "schemastore.db" ) )
{
return getRecordSize( SchemaStore.BLOCK_SIZE );
}
else if ( fileName.getName().endsWith( "relationshipgroupstore.db" ) )
{
return getRecordSize( RelationshipGroupRecordFormat.RECORD_SIZE );
}
throw new IllegalArgumentException( fileName.getPath() );
}
public class JumpingFileChannel extends StoreFileChannel
{
private final int recordSize;
public JumpingFileChannel( StoreFileChannel actual, int recordSize )
{
super( actual );
this.recordSize = recordSize;
}
private long translateIncoming( long position )
{
return translateIncoming( position, false );
}
private long translateIncoming( long position, boolean allowFix )
{
long actualRecord = position/recordSize;
if ( actualRecord < sizePerJump/2 )
{
return position;
}
else
{
long jumpIndex = (actualRecord+sizePerJump)/0x100000000L;
long diff = actualRecord - jumpIndex * 0x100000000L;
diff = assertWithinDiff( diff, allowFix );
long offsettedRecord = jumpIndex*sizePerJump + diff;
return offsettedRecord*recordSize;
}
}
private long translateOutgoing( long offsettedPosition )
{
long offsettedRecord = offsettedPosition/recordSize;
if ( offsettedRecord < sizePerJump/2 )
{
return offsettedPosition;
}
else
{
long jumpIndex = (offsettedRecord-sizePerJump/2) / sizePerJump + 1;
long diff = ((offsettedRecord-sizePerJump/2) % sizePerJump) - sizePerJump/2;
assertWithinDiff( diff, false );
long actualRecord = jumpIndex*0x100000000L - sizePerJump/2 + diff;
return actualRecord*recordSize;
}
}
private long assertWithinDiff( long diff, boolean allowFix )
{
if ( diff < -sizePerJump/2 || diff > sizePerJump/2 )
{
if ( allowFix )
{
// This is needed for shutdown() to work, PropertyStore
// gives an invalid offset for truncate.
if ( diff < -sizePerJump / 2 )
{
return -sizePerJump / 2;
}
else
{
return sizePerJump / 2;
}
}
throw new IllegalArgumentException( "" + diff );
}
return diff;
}
@Override
public long position() throws IOException
{
return translateOutgoing( super.position() );
}
@Override
public JumpingFileChannel position( long newPosition ) throws IOException
{
super.position( translateIncoming( newPosition ) );
return this;
}
@Override
public long size() throws IOException
{
return translateOutgoing( super.size() );
}
@Override
public JumpingFileChannel truncate( long size ) throws IOException
{
super.truncate( translateIncoming( size, true ) );
return this;
}
@Override
public int read( ByteBuffer dst, long position ) throws IOException
{
return super.read( dst, translateIncoming( position ) );
}
@Override
public int write( ByteBuffer src, long position ) throws IOException
{
return super.write( src, translateIncoming( position ) );
}
}
public void shutdown()
{
ephemeralFileSystem.close();
}
}