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PartitionedBloomIndexReader.java
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PartitionedBloomIndexReader.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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.api.impl.bloom;
import org.apache.lucene.analysis.Analyzer;
import java.io.IOException;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import org.neo4j.collection.primitive.PrimitiveLongCollections;
import org.neo4j.collection.primitive.PrimitiveLongIterator;
import org.neo4j.io.IOUtils;
import org.neo4j.kernel.api.impl.index.partition.PartitionSearcher;
import org.neo4j.kernel.api.impl.schema.reader.IndexReaderCloseException;
/**
* Index reader that is able to read/sample multiple partitions of a partitioned Lucene index.
* Internally uses multiple {@link SimpleBloomIndexReader}s for individual partitions.
*
* @see SimpleBloomIndexReader
*/
class PartitionedBloomIndexReader implements BloomIndexReader
{
private final List<BloomIndexReader> indexReaders;
PartitionedBloomIndexReader( List<PartitionSearcher> partitionSearchers, String[] properties, Analyzer analyzer )
{
this( partitionSearchers.stream().map( partitionSearcher -> new SimpleBloomIndexReader( partitionSearcher, properties, analyzer ) )
.collect( Collectors.toList() ) );
}
private PartitionedBloomIndexReader( List<BloomIndexReader> readers )
{
this.indexReaders = readers;
}
public PrimitiveLongIterator query( String... query )
{
return partitionedOperation( reader -> innerQuery( reader, query ) );
}
private PrimitiveLongIterator innerQuery( BloomIndexReader reader, String... query )
{
return reader.query( query );
}
public void close()
{
try
{
IOUtils.closeAll( indexReaders );
}
catch ( IOException e )
{
throw new IndexReaderCloseException( e );
}
}
private PrimitiveLongIterator partitionedOperation(
Function<BloomIndexReader,PrimitiveLongIterator> readerFunction )
{
return PrimitiveLongCollections
.concat( indexReaders.parallelStream().map( readerFunction::apply ).collect( Collectors.toList() ) );
}
}