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LuceneLabelScanIndex.java
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LuceneLabelScanIndex.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;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.util.List;
import java.util.concurrent.locks.Lock;
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 org.neo4j.kernel.api.labelscan.AllEntriesLabelScanReader;
import org.neo4j.kernel.api.labelscan.LabelScanWriter;
import org.neo4j.kernel.api.labelscan.NodeLabelRange;
import org.neo4j.storageengine.api.schema.LabelScanReader;
public class LuceneLabelScanIndex extends AbstractLuceneIndex
{
private final BitmapDocumentFormat format;
private final LabelScanStorageStrategy storageStrategy;
public LuceneLabelScanIndex( BitmapDocumentFormat format, PartitionedIndexStorage indexStorage )
{
super( indexStorage );
this.format = format;
this.storageStrategy = new NodeRangeDocumentLabelScanStorageStrategy( format );
}
public LabelScanReader getLabelScanReader()
{
ensureOpen();
readWriteLock.lock();
try
{
List<IndexPartition> partitions = getPartitions();
if ( hasSinglePartition( partitions ) )
{
IndexPartition partition = getFirstPartition( partitions );
PartitionSearcher searcher = partition.acquireSearcher();
return new SimpleLuceneLabelScanStoreReader( searcher, storageStrategy );
}
throw new UnsupportedOperationException();
}
catch ( IOException e )
{
throw new UncheckedIOException( e );
}
finally
{
readWriteLock.unlock();
}
}
public LabelScanWriter getLabelScanWriter( Lock heldLock )
{
ensureOpen();
readWriteLock.lock();
try
{
List<IndexPartition> partitions = getPartitions();
if ( hasSinglePartition( partitions ) )
{
return new SimpleLuceneLabelScanWriter( getFirstPartition( partitions ), format, heldLock );
}
throw new UnsupportedOperationException();
}
finally
{
readWriteLock.unlock();
}
}
/**
* Retrieves a {@link AllEntriesLabelScanReader reader} over all {@link NodeLabelRange node label} ranges.
* <p>
* <b>NOTE:</b>
* There are no guarantees that reader returned from this method will see consistent documents with respect to
* {@link #getLabelScanReader() regular reader} and {@link #getLabelScanWriter(Lock) regular writer}.
*
* @return the {@link AllEntriesLabelScanReader reader}.
*/
public AllEntriesLabelScanReader allNodeLabelRanges()
{
return storageStrategy.newNodeLabelReader( allDocumentsReader() );
}
}