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CountsStoreTransactionApplier.java
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CountsStoreTransactionApplier.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;
import java.io.IOException;
import org.neo4j.kernel.impl.store.counts.CountsTracker;
import org.neo4j.kernel.impl.transaction.command.Command;
import org.neo4j.kernel.impl.transaction.command.Command.SchemaRuleCommand;
import org.neo4j.storageengine.api.TransactionApplicationMode;
public class CountsStoreTransactionApplier extends TransactionApplier.Adapter
{
private final TransactionApplicationMode mode;
private final CountsTracker.Updater countsUpdater;
public CountsStoreTransactionApplier( TransactionApplicationMode mode, CountsAccessor.Updater countsUpdater )
{
this.mode = mode;
this.countsUpdater = countsUpdater;
}
@Override
public void close() throws Exception
{
assert countsUpdater != null || mode == TransactionApplicationMode.RECOVERY : "You must call begin first";
closeCountsUpdaterIfOpen();
}
private void closeCountsUpdaterIfOpen()
{
if ( countsUpdater != null )
{ // CountsUpdater is null if we're in recovery and the counts store already has had this transaction applied.
countsUpdater.close();
}
}
@Override
public boolean visitNodeCountsCommand( Command.NodeCountsCommand command )
{
assert countsUpdater != null || mode == TransactionApplicationMode.RECOVERY : "You must call begin first";
if ( countsUpdater != null )
{ // CountsUpdater is null if we're in recovery and the counts store already has had this transaction applied.
countsUpdater.incrementNodeCount( command.labelId(), command.delta() );
}
return false;
}
@Override
public boolean visitRelationshipCountsCommand( Command.RelationshipCountsCommand command ) throws IOException
{
assert countsUpdater != null || mode == TransactionApplicationMode.RECOVERY : "You must call begin first";
if ( countsUpdater != null )
{ // CountsUpdater is null if we're in recovery and the counts store already has had this transaction applied.
countsUpdater.incrementRelationshipCount(
command.startLabelId(), command.typeId(), command.endLabelId(), command.delta() );
}
return false;
}
@Override
public boolean visitSchemaRuleCommand( SchemaRuleCommand command ) throws IOException
{
// This shows that this transaction is a schema transaction, so it cannot have commands
// updating any counts anyway. Therefore the counts updater is closed right away.
// This also breaks an otherwise deadlocking scenario between check pointer, this applier
// and an index population thread wanting to apply index sampling to the counts store.
closeCountsUpdaterIfOpen();
return false;
}
}