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FusionIndexReader.java
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FusionIndexReader.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.impl.index.schema.fusion;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Queue;
import org.neo4j.collection.primitive.PrimitiveLongResourceCollections;
import org.neo4j.collection.primitive.PrimitiveLongResourceIterator;
import org.neo4j.internal.kernel.api.IndexOrder;
import org.neo4j.internal.kernel.api.IndexQuery;
import org.neo4j.internal.kernel.api.IndexQuery.ExactPredicate;
import org.neo4j.internal.kernel.api.IndexQuery.ExistsPredicate;
import org.neo4j.internal.kernel.api.IndexQuery.NumberRangePredicate;
import org.neo4j.kernel.api.exceptions.index.IndexNotApplicableKernelException;
import org.neo4j.kernel.impl.index.schema.fusion.FusionSchemaIndexProvider.Selector;
import org.neo4j.storageengine.api.schema.IndexProgressor;
import org.neo4j.storageengine.api.schema.IndexReader;
import org.neo4j.storageengine.api.schema.IndexSampler;
import org.neo4j.values.storable.Value;
import static java.lang.String.format;
class FusionIndexReader implements IndexReader
{
private final IndexReader nativeReader;
private final IndexReader luceneReader;
private final Selector selector;
private final int[] propertyKeys;
FusionIndexReader( IndexReader nativeReader, IndexReader luceneReader, Selector selector, int[] propertyKeys )
{
this.nativeReader = nativeReader;
this.luceneReader = luceneReader;
this.selector = selector;
this.propertyKeys = propertyKeys;
}
@Override
public void close()
{
try
{
nativeReader.close();
}
finally
{
luceneReader.close();
}
}
@Override
public long countIndexedNodes( long nodeId, Value... propertyValues )
{
return selector.select( nativeReader, luceneReader, propertyValues ).countIndexedNodes( nodeId, propertyValues );
}
@Override
public IndexSampler createSampler()
{
return new FusionIndexSampler( nativeReader.createSampler(), luceneReader.createSampler() );
}
@Override
public PrimitiveLongResourceIterator query( IndexQuery... predicates ) throws IndexNotApplicableKernelException
{
if ( predicates.length > 1 )
{
return luceneReader.query( predicates );
}
if ( predicates[0] instanceof ExactPredicate )
{
ExactPredicate exactPredicate = (ExactPredicate) predicates[0];
return selector.select( nativeReader, luceneReader, exactPredicate.value() ).query( predicates );
}
if ( predicates[0] instanceof NumberRangePredicate )
{
return nativeReader.query( predicates[0] );
}
// todo: There will be no ordering of the node ids here. Is this a problem?
if ( predicates[0] instanceof ExistsPredicate )
{
PrimitiveLongResourceIterator nativeResult = nativeReader.query( predicates[0] );
PrimitiveLongResourceIterator luceneResult = luceneReader.query( predicates[0] );
return PrimitiveLongResourceCollections.concat( nativeResult, luceneResult );
}
return luceneReader.query( predicates );
}
@Override
public void query( IndexProgressor.NodeValueClient cursor, IndexOrder indexOrder, IndexQuery... predicates )
throws IndexNotApplicableKernelException
{
if ( predicates.length > 1 )
{
luceneReader.query( cursor, indexOrder, predicates );
return;
}
if ( predicates[0] instanceof ExactPredicate )
{
ExactPredicate exactPredicate = (ExactPredicate) predicates[0];
selector.select( nativeReader, luceneReader, exactPredicate.value() ).query( cursor, indexOrder, predicates );
return;
}
if ( predicates[0] instanceof NumberRangePredicate )
{
nativeReader.query( cursor, indexOrder, predicates[0] );
return;
}
// todo: There will be no ordering of the node ids here. Is this a problem?
if ( predicates[0] instanceof ExistsPredicate )
{
if ( indexOrder != IndexOrder.NONE )
{
throw new UnsupportedOperationException(
format( "Tried to query index with unsupported order %s. Supported orders for query %s are %s.",
indexOrder, Arrays.toString( predicates ), IndexOrder.NONE ) );
}
BridgingIndexProgressor multiProgressor = new BridgingIndexProgressor( cursor, propertyKeys );
cursor.initialize( multiProgressor, propertyKeys );
nativeReader.query( multiProgressor, indexOrder, predicates[0] );
luceneReader.query( multiProgressor, indexOrder, predicates[0] );
return;
}
luceneReader.query( cursor, indexOrder, predicates );
}
@Override
public boolean hasFullNumberPrecision( IndexQuery... predicates )
{
if ( predicates.length > 1 )
{
return false;
}
IndexQuery predicate = predicates[0];
if ( predicate instanceof ExactPredicate )
{
Value value = ((ExactPredicate) predicate).value();
return selector.select(
nativeReader.hasFullNumberPrecision( predicates ),
luceneReader.hasFullNumberPrecision( predicates ), value );
}
return predicates[0] instanceof NumberRangePredicate && nativeReader.hasFullNumberPrecision( predicates );
}
/**
* Combine multiple progressor to act like one single logical progressor seen from clients perspective.
*/
private class BridgingIndexProgressor implements IndexProgressor.NodeValueClient, IndexProgressor
{
private final NodeValueClient client;
private final int[] keys;
private final Queue<IndexProgressor> progressors;
private IndexProgressor current;
BridgingIndexProgressor( NodeValueClient client, int[] keys )
{
this.client = client;
this.keys = keys;
progressors = new ArrayDeque<>();
}
@Override
public boolean next()
{
if ( current == null )
{
current = progressors.poll();
}
while ( current != null )
{
if ( current.next() )
{
return true;
}
else
{
current.close();
current = progressors.poll();
}
}
return false;
}
@Override
public void close()
{
progressors.forEach( IndexProgressor::close );
}
@Override
public void initialize( IndexProgressor progressor, int[] keys )
{
assertKeysAlign( keys );
progressors.add( progressor );
}
private void assertKeysAlign( int[] keys )
{
for ( int i = 0; i < this.keys.length; i++ )
{
if ( this.keys[i] != keys[i] )
{
throw new UnsupportedOperationException( "Can not chain multiple progressors with different key set." );
}
}
}
@Override
public boolean acceptNode( long reference, Value[] values )
{
return client.acceptNode( reference, values );
}
}
}