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NodePropertyCommandsExtractor.java
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NodePropertyCommandsExtractor.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.api.index;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.neo4j.collection.primitive.PrimitiveLongObjectMap;
import org.neo4j.kernel.api.index.NodePropertyUpdate;
import org.neo4j.kernel.impl.api.BatchTransactionApplier;
import org.neo4j.kernel.impl.api.TransactionApplier;
import org.neo4j.kernel.impl.locking.LockGroup;
import org.neo4j.kernel.impl.transaction.command.Command.NodeCommand;
import org.neo4j.kernel.impl.transaction.command.Command.PropertyCommand;
import org.neo4j.storageengine.api.CommandsToApply;
import static org.neo4j.collection.primitive.Primitive.longObjectMap;
import static org.neo4j.kernel.impl.store.NodeLabelsField.fieldPointsToDynamicRecordOfLabels;
/**
* Implements both BatchTransactionApplier and TransactionApplier in order to reduce garbage.
* Gathers node/property commands by node id, preparing for extraction of {@link NodePropertyUpdate updates}.
*/
public class NodePropertyCommandsExtractor extends TransactionApplier.Adapter
implements BatchTransactionApplier
{
private final PrimitiveLongObjectMap<NodeCommand> nodeCommandsById = longObjectMap();
private final PrimitiveLongObjectMap<List<PropertyCommand>> propertyCommandsByNodeIds = longObjectMap();
private boolean hasUpdates;
@Override
public TransactionApplier startTx( CommandsToApply transaction )
{
return this;
}
@Override
public TransactionApplier startTx( CommandsToApply transaction, LockGroup lockGroup )
{
return startTx( transaction );
}
@Override
public void close() throws Exception
{
nodeCommandsById.clear();
propertyCommandsByNodeIds.clear();
}
@Override
public boolean visitNodeCommand( NodeCommand command ) throws IOException
{
nodeCommandsById.put( command.getKey(), command );
if ( !hasUpdates && mayResultInIndexUpdates( command ) )
{
hasUpdates = true;
}
return false;
}
public static boolean mayResultInIndexUpdates( NodeCommand command )
{
long before = command.getBefore().getLabelField();
long after = command.getAfter().getLabelField();
return before != after ||
// Because we don't know here, there may have been changes to a dynamic label record
// even though it still points to the same one
fieldPointsToDynamicRecordOfLabels( before ) || fieldPointsToDynamicRecordOfLabels( after );
}
public static boolean mayResultInIndexUpdates( PropertyCommand command )
{
return command.getAfter().isNodeSet();
}
@Override
public boolean visitPropertyCommand( PropertyCommand command ) throws IOException
{
if ( mayResultInIndexUpdates( command ) )
{
long nodeId = command.getAfter().getNodeId();
List<PropertyCommand> group = propertyCommandsByNodeIds.get( nodeId );
if ( group == null )
{
propertyCommandsByNodeIds.put( nodeId, group = new ArrayList<>() );
}
group.add( command );
hasUpdates = true;
}
return false;
}
public boolean containsAnyNodeOrPropertyUpdate()
{
return hasUpdates;
}
public PrimitiveLongObjectMap<NodeCommand> nodeCommandsById()
{
return nodeCommandsById;
}
public PrimitiveLongObjectMap<List<PropertyCommand>> propertyCommandsByNodeIds()
{
return propertyCommandsByNodeIds;
}
}