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LuceneSchemaIndex.java
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LuceneSchemaIndex.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 org.apache.lucene.index.IndexWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.neo4j.helpers.TaskCoordinator;
import org.neo4j.kernel.api.exceptions.index.IndexEntryConflictException;
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.reader.PartitionedIndexReader;
import org.neo4j.kernel.api.impl.index.reader.SimpleIndexReader;
import org.neo4j.kernel.api.impl.index.storage.PartitionedIndexStorage;
import org.neo4j.kernel.api.impl.index.verification.PartitionedUniquenessVerifier;
import org.neo4j.kernel.api.impl.index.verification.SimpleUniquenessVerifier;
import org.neo4j.kernel.api.impl.index.verification.UniquenessVerifier;
import org.neo4j.kernel.api.index.IndexConfiguration;
import org.neo4j.kernel.api.index.PropertyAccessor;
import org.neo4j.kernel.impl.api.index.sampling.IndexSamplingConfig;
import org.neo4j.storageengine.api.schema.IndexReader;
import static java.util.Collections.singletonMap;
public class LuceneSchemaIndex extends AbstractLuceneIndex
{
private static final String KEY_STATUS = "status";
private static final String ONLINE = "online";
private static final Map<String,String> ONLINE_COMMIT_USER_DATA = singletonMap( KEY_STATUS, ONLINE );
private final IndexConfiguration config;
private final IndexSamplingConfig samplingConfig;
private final TaskCoordinator taskCoordinator = new TaskCoordinator( 10, TimeUnit.MILLISECONDS );
public LuceneSchemaIndex( PartitionedIndexStorage indexStorage, IndexConfiguration config,
IndexSamplingConfig samplingConfig )
{
super( indexStorage );
this.config = config;
this.samplingConfig = samplingConfig;
}
public LuceneIndexWriter getIndexWriter() throws IOException
{
ensureOpen();
return new PartitionedIndexWriter( this );
}
public IndexReader getIndexReader() throws IOException
{
ensureOpen();
readWriteLock.lock();
try
{
List<IndexPartition> partitions = getPartitions();
return hasSinglePartition( partitions ) ? createSimpleReader( partitions )
: createPartitionedReader( partitions );
}
finally
{
readWriteLock.unlock();
}
}
public void verifyUniqueness( PropertyAccessor accessor, int propertyKeyId )
throws IOException, IndexEntryConflictException
{
try ( UniquenessVerifier verifier = createUniquenessVerifier() )
{
verifier.verify( accessor, propertyKeyId );
}
}
public void verifyUniqueness( PropertyAccessor accessor, int propertyKeyId, List<Object> updatedPropertyValues )
throws IOException, IndexEntryConflictException
{
try ( UniquenessVerifier verifier = createUniquenessVerifier() )
{
verifier.verify( accessor, propertyKeyId, updatedPropertyValues );
}
}
private UniquenessVerifier createUniquenessVerifier() throws IOException
{
ensureOpen();
maybeRefresh();
List<IndexPartition> partitions = getPartitions();
return hasSinglePartition( partitions ) ? createSimpleUniquenessVerifier( partitions )
: createPartitionedUniquenessVerifier( partitions );
}
private boolean hasSinglePartition( List<IndexPartition> partitions )
{
return partitions.size() == 1;
}
private SimpleIndexReader createSimpleReader( List<IndexPartition> partitions ) throws IOException
{
IndexPartition singlePartition = partitions.get( 0 );
return new SimpleIndexReader( singlePartition.acquireSearcher(), config, samplingConfig, taskCoordinator );
}
private PartitionedIndexReader createPartitionedReader( List<IndexPartition> partitions ) throws IOException
{
List<PartitionSearcher> searchers = acquireSearchers( partitions );
return new PartitionedIndexReader( searchers );
}
private UniquenessVerifier createSimpleUniquenessVerifier( List<IndexPartition> partitions ) throws IOException
{
IndexPartition singlePartition = partitions.get( 0 );
PartitionSearcher partitionSearcher = singlePartition.acquireSearcher();
return new SimpleUniquenessVerifier( partitionSearcher );
}
private UniquenessVerifier createPartitionedUniquenessVerifier( List<IndexPartition> partitions ) throws IOException
{
List<PartitionSearcher> searchers = acquireSearchers( partitions );
return new PartitionedUniquenessVerifier( searchers );
}
private static List<PartitionSearcher> acquireSearchers( List<IndexPartition> partitions ) throws IOException
{
List<PartitionSearcher> searchers = new ArrayList<>( partitions.size() );
for ( IndexPartition partition : partitions )
{
searchers.add( partition.acquireSearcher() );
}
return searchers;
}
@Override
public void drop() throws IOException
{
taskCoordinator.cancel();
try
{
taskCoordinator.awaitCompletion();
}
catch ( InterruptedException e )
{
throw new IOException( "Interrupted while waiting for concurrent tasks to complete.", e );
}
super.drop();
}
public void markAsOnline() throws IOException
{
ensureOpen();
commitCloseLock.lock();
try
{
IndexPartition indexPartition = getPartitions().get( 0 );
IndexWriter indexWriter = indexPartition.getIndexWriter();
indexWriter.setCommitData( ONLINE_COMMIT_USER_DATA );
indexWriter.commit();
}
finally
{
commitCloseLock.unlock();
}
}
public void markAsFailed( String failure ) throws IOException
{
indexStorage.storeIndexFailure( failure );
}
}