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AggregatingIndexSampler.java
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AggregatingIndexSampler.java
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/*
* Copyright (c) 2002-2019 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.sampler;
import java.util.List;
import org.neo4j.io.IOUtils;
import org.neo4j.kernel.api.exceptions.index.IndexNotFoundKernelException;
import org.neo4j.storageengine.api.schema.IndexSample;
import org.neo4j.storageengine.api.schema.IndexSampler;
/**
* Index sampler implementation that provide total sampling result of multiple provided samples, by aggregating their
* internal independent samples.
*/
public class AggregatingIndexSampler implements IndexSampler
{
private List<IndexSampler> indexSamplers;
public AggregatingIndexSampler( List<IndexSampler> indexSamplers )
{
this.indexSamplers = indexSamplers;
}
@Override
public IndexSample sampleIndex()
{
return indexSamplers.parallelStream()
.map( this::sampleIndex )
.reduce( this::combine )
.get();
}
private IndexSample sampleIndex( IndexSampler sampler )
{
try
{
return sampler.sampleIndex();
}
catch ( IndexNotFoundKernelException e )
{
throw new RuntimeException( e );
}
}
public IndexSample combine( IndexSample sample1, IndexSample sample2 )
{
long indexSize = Math.addExact( sample1.indexSize(), sample2.indexSize() );
long uniqueValues = Math.addExact( sample1.uniqueValues(), sample2.uniqueValues() );
long sampleSize = Math.addExact( sample1.sampleSize(), sample2.sampleSize() );
return new IndexSample( indexSize, uniqueValues, sampleSize );
}
@Override
public void close()
{
IOUtils.closeAllSilently( indexSamplers );
}
}