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AbstractLuceneIndex.java
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AbstractLuceneIndex.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 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.api.impl.index;
import org.apache.lucene.index.CheckIndex;
import org.apache.lucene.index.IndexFileNames;
import org.apache.lucene.store.Directory;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.locks.ReentrantLock;
import java.util.stream.Stream;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.helpers.ArrayUtil;
import org.neo4j.helpers.Exceptions;
import org.neo4j.helpers.collection.Iterables;
import org.neo4j.io.IOUtils;
import org.neo4j.kernel.api.impl.index.partition.IndexPartition;
import org.neo4j.kernel.api.impl.index.partition.PartitionSearcher;
import org.neo4j.kernel.api.impl.index.storage.PartitionedIndexStorage;
import static java.util.stream.Collectors.toList;
// todo: this component has an implicit possibility to be opened and closed multiple times. we should revisit and at least test it.
public abstract class AbstractLuceneIndex implements Closeable
{
protected final ReentrantLock commitCloseLock = new ReentrantLock();
protected final ReentrantLock readWriteLock = new ReentrantLock();
protected final PartitionedIndexStorage indexStorage;
private List<IndexPartition> partitions = new CopyOnWriteArrayList<>();
private volatile boolean open;
public AbstractLuceneIndex( PartitionedIndexStorage indexStorage )
{
this.indexStorage = indexStorage;
}
public void create() throws IOException
{
indexStorage.prepareFolder( indexStorage.getIndexFolder() );
indexStorage.reserveIndexFailureStorage();
createNewPartitionFolder();
}
public void open() throws IOException
{
Map<File,Directory> indexDirectories = indexStorage.openIndexDirectories();
for ( Map.Entry<File,Directory> indexDirectory : indexDirectories.entrySet() )
{
partitions.add( new IndexPartition( indexDirectory.getKey(), indexDirectory.getValue() ) );
}
open = true;
}
public boolean exists()
{
List<File> folders = indexStorage.listFolders();
if ( folders.isEmpty() )
{
return false;
}
for ( File folder : folders )
{
String[] files = folder.list();
if ( files == null || !containsSegmentFile( files ) )
{
return false;
}
}
return true;
}
public boolean isValid()
{
if ( open )
{
return true;
}
Collection<Directory> directories = null;
try
{
directories = indexStorage.openIndexDirectories().values();
for ( Directory directory : directories )
{
// it is ok for index directory to be empty
// this can happen if it is opened and closed without any writes in between
if ( !ArrayUtil.isEmpty( directory.listAll() ) )
{
try ( CheckIndex checker = new CheckIndex( directory ) )
{
CheckIndex.Status status = checker.checkIndex();
if ( !status.clean )
{
return false;
}
}
}
}
}
catch ( IOException e )
{
return false;
}
finally
{
IOUtils.closeAllSilently( directories );
}
return true;
}
public void drop() throws IOException
{
close();
indexStorage.cleanupFolder( indexStorage.getIndexFolder() );
}
public void flush() throws IOException
{
// TODO: do we need it?
}
@Override
public void close() throws IOException
{
commitCloseLock.lock();
try
{
IOUtils.closeAll( partitions );
partitions.clear();
open = false;
}
finally
{
commitCloseLock.unlock();
}
}
public LuceneAllDocumentsReader allDocumentsReader()
{
ensureOpen();
readWriteLock.lock();
try
{
List<PartitionSearcher> searchers = new ArrayList<>( partitions.size() );
try
{
for ( IndexPartition partition : partitions )
{
searchers.add( partition.acquireSearcher() );
}
List<LucenePartitionAllDocumentsReader> partitionReaders = searchers.stream()
.map( LucenePartitionAllDocumentsReader::new )
.collect( toList() );
return new LuceneAllDocumentsReader( partitionReaders );
}
catch ( IOException e )
{
IOUtils.closeAllSilently( searchers );
throw new UncheckedIOException( e );
}
}
finally
{
readWriteLock.unlock();
}
}
public ResourceIterator<File> snapshot() throws IOException
{
ensureOpen();
commitCloseLock.lock();
List<ResourceIterator<File>> snapshotIterators = null;
try
{
List<IndexPartition> partitions = getPartitions();
snapshotIterators = new ArrayList<>( partitions.size() );
for ( IndexPartition partition : partitions )
{
snapshotIterators.add( partition.snapshot() );
}
return Iterables.concatResourceIterators( snapshotIterators.iterator() );
}
catch ( Exception e )
{
if ( snapshotIterators != null )
{
try
{
IOUtils.closeAll( snapshotIterators );
}
catch ( IOException ex )
{
throw Exceptions.withCause( ex, e );
}
}
throw e;
}
finally
{
commitCloseLock.unlock();
}
}
// todo: remove and always use maybeRefreshBlocking?
public void maybeRefresh() throws IOException
{
readWriteLock.lock();
try
{
for ( IndexPartition partition : getPartitions() )
{
partition.maybeRefresh();
}
}
finally
{
readWriteLock.unlock();
}
}
public void maybeRefreshBlocking() throws IOException
{
readWriteLock.lock();
try
{
for ( IndexPartition partition : getPartitions() )
{
partition.maybeRefreshBlocking();
}
}
finally
{
readWriteLock.unlock();
}
}
List<IndexPartition> getPartitions()
{
ensureOpen();
return partitions;
}
IndexPartition addNewPartition() throws IOException
{
ensureOpen();
readWriteLock.lock();
try
{
File partitionFolder = createNewPartitionFolder();
IndexPartition indexPartition = new IndexPartition( partitionFolder,
indexStorage.openDirectory( partitionFolder ) );
partitions.add( indexPartition );
return indexPartition;
}
finally
{
readWriteLock.unlock();
}
}
protected void ensureOpen()
{
if ( !open )
{
throw new IllegalStateException( "Please open lucene index before working with it." );
}
}
private static boolean containsSegmentFile( String[] files )
{
return Stream.of( files ).anyMatch( file -> file.startsWith( IndexFileNames.SEGMENTS ) );
}
private File createNewPartitionFolder() throws IOException
{
File partitionFolder = indexStorage.getPartitionFolder( partitions.size() + 1 );
indexStorage.prepareFolder( partitionFolder );
return partitionFolder;
}
}