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IndexPartition.java
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IndexPartition.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.api.impl.index.partition;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.search.SearcherFactory;
import org.apache.lucene.search.SearcherManager;
import org.apache.lucene.store.Directory;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.io.IOUtils;
import org.neo4j.kernel.api.impl.index.backup.LuceneIndexSnapshotFileIterator;
/**
* Represents a single partition of a partitioned lucene index. Each partition is a separate Lucene index.
* Contains and manages lifecycle of the corresponding {@link Directory}, {@link IndexWriter writer} and
* {@link SearcherManager}.
*/
public class IndexPartition implements Closeable
{
private final IndexWriter indexWriter;
private final Directory directory;
private final SearcherManager searcherManager;
private final File indexFolder;
public IndexPartition( File partitionFolder, Directory directory, IndexWriterConfig writerConfig )
throws IOException
{
this.indexFolder = partitionFolder;
this.directory = directory;
this.indexWriter = new IndexWriter( directory, writerConfig );
this.searcherManager = new SearcherManager( indexWriter, new SearcherFactory() );
}
public IndexWriter getIndexWriter()
{
return indexWriter;
}
public Directory getDirectory()
{
return directory;
}
/**
* Return searcher for requested partition.
* There is no tracking of acquired searchers, so the expectation is that callers will call close on acquired
* searchers to release resources.
*
* @return partition searcher
* @throws IOException if exception happened during searcher acquisition
*/
public PartitionSearcher acquireSearcher() throws IOException
{
return new PartitionSearcher( searcherManager );
}
/**
* Refresh partition to make newly inserted data visible for readers.
*
* @throws IOException if refreshing fails.
*/
public void maybeRefreshBlocking() throws IOException
{
searcherManager.maybeRefreshBlocking();
}
@Override
public void close() throws IOException
{
IOUtils.closeAll( searcherManager, indexWriter, directory );
}
/**
* Retrieve list of consistent Lucene index files for this partition.
*
* @return the iterator over index files.
* @throws IOException if any IO operation fails.
*/
public ResourceIterator<File> snapshot() throws IOException
{
return LuceneIndexSnapshotFileIterator.forIndex( indexFolder, indexWriter );
}
}