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NonUniqueLuceneIndexPopulator.java
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NonUniqueLuceneIndexPopulator.java
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/*
* Copyright (c) 2002-2017 "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.schema.populator;
import java.io.IOException;
import org.neo4j.kernel.api.exceptions.index.IndexEntryConflictException;
import org.neo4j.kernel.api.impl.schema.LuceneDocumentStructure;
import org.neo4j.kernel.api.impl.schema.SchemaIndex;
import org.neo4j.kernel.api.index.IndexEntryUpdate;
import org.neo4j.kernel.api.index.IndexUpdater;
import org.neo4j.kernel.api.index.PropertyAccessor;
import org.neo4j.kernel.impl.api.index.sampling.DefaultNonUniqueIndexSampler;
import org.neo4j.kernel.impl.api.index.sampling.IndexSamplingConfig;
import org.neo4j.kernel.impl.api.index.sampling.NonUniqueIndexSampler;
import org.neo4j.storageengine.api.schema.IndexSample;
/**
* A {@link LuceneIndexPopulator} used for non-unique Lucene schema indexes.
* Performs sampling using {@link DefaultNonUniqueIndexSampler}.
*/
public class NonUniqueLuceneIndexPopulator extends LuceneIndexPopulator
{
private final IndexSamplingConfig samplingConfig;
private NonUniqueIndexSampler sampler;
private boolean updateSampling;
public NonUniqueLuceneIndexPopulator( SchemaIndex luceneIndex, IndexSamplingConfig samplingConfig )
{
super( luceneIndex );
this.samplingConfig = samplingConfig;
}
@Override
public void configureSampling( boolean onlineSampling )
{
this.updateSampling = onlineSampling;
this.sampler = onlineSampling ? createDefaultSampler()
: new DirectNonUniqueIndexSampler( luceneIndex );
}
@Override
public void verifyDeferredConstraints( PropertyAccessor accessor ) throws IndexEntryConflictException, IOException
{
// no constraints to verify so do nothing
}
@Override
public IndexUpdater newPopulatingUpdater( PropertyAccessor propertyAccessor ) throws IOException
{
checkSampler();
return new NonUniqueLuceneIndexPopulatingUpdater( writer, sampler );
}
@Override
public void includeSample( IndexEntryUpdate update )
{
if ( updateSampling )
{
checkSampler();
sampler.include( LuceneDocumentStructure.encodedStringValue( update.values()[0] ) );
}
}
@Override
public IndexSample sampleResult()
{
checkSampler();
return sampler.result();
}
private DefaultNonUniqueIndexSampler createDefaultSampler()
{
return new DefaultNonUniqueIndexSampler( samplingConfig.sampleSizeLimit() );
}
private void checkSampler()
{
if ( sampler == null )
{
throw new IllegalStateException( "Please configure populator sampler before using it." );
}
}
}