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LuceneLabelScanStoreChaosIT.java
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LuceneLabelScanStoreChaosIT.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.graphdb;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.Collections;
import java.util.List;
import java.util.stream.Stream;
import org.neo4j.kernel.api.impl.labelscan.LuceneLabelScanIndexBuilder;
import org.neo4j.test.rule.DatabaseRule;
import static java.util.stream.Collectors.toList;
import static org.junit.Assert.assertTrue;
import static org.neo4j.io.fs.FileUtils.deleteRecursively;
public class LuceneLabelScanStoreChaosIT extends LabelScanStoreChaosIT
{
@Override
protected DatabaseRule.RestartAction corruptTheLabelScanStoreIndex()
{
return ( fs, storeDirectory ) -> {
try
{
int filesCorrupted = 0;
List<File> partitionDirs = labelScanStoreIndexDirectories( storeDirectory );
for ( File partitionDir : partitionDirs )
{
for ( File file : partitionDir.listFiles() )
{
scrambleFile( file );
filesCorrupted++;
}
}
assertTrue( "No files found to corrupt", filesCorrupted > 0 );
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
};
}
@Override
protected DatabaseRule.RestartAction deleteTheLabelScanStoreIndex()
{
return ( fs, storeDirectory ) -> {
try
{
List<File> partitionDirs = labelScanStoreIndexDirectories( storeDirectory );
for ( File dir : partitionDirs )
{
assertTrue( "We seem to want to delete the wrong directory here", dir.exists() );
assertTrue( "No index files to delete", dir.listFiles().length > 0 );
deleteRecursively( dir );
}
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
};
}
private List<File> labelScanStoreIndexDirectories( File storeDirectory )
{
File rootDir = new File( new File( new File( new File( storeDirectory, "schema" ), "label" ), "lucene" ),
LuceneLabelScanIndexBuilder.DEFAULT_INDEX_IDENTIFIER );
File[] partitionDirs = rootDir.listFiles( File::isDirectory );
return (partitionDirs == null) ? Collections.emptyList() : Stream.of( partitionDirs ).collect( toList() );
}
private void scrambleFile( File file ) throws IOException
{
try ( RandomAccessFile fileAccess = new RandomAccessFile( file, "rw" );
FileChannel channel = fileAccess.getChannel() )
{
// The files will be small, so OK to allocate a buffer for the full size
byte[] bytes = new byte[(int) channel.size()];
putRandomBytes( bytes );
ByteBuffer buffer = ByteBuffer.wrap( bytes );
channel.position( 0 );
channel.write( buffer );
}
}
private void putRandomBytes( byte[] bytes )
{
for ( int i = 0; i < bytes.length; i++ )
{
bytes[i] = (byte) randomRule.nextInt();
}
}
}