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CountsComputer.java
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/
CountsComputer.java
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/**
* Copyright (c) 2002-2015 "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.store;
import org.neo4j.kernel.impl.api.CountsAccessor;
import org.neo4j.kernel.impl.store.kvstore.DataInitializer;
import org.neo4j.unsafe.impl.batchimport.Configuration;
import org.neo4j.unsafe.impl.batchimport.NodeCountsProcessor;
import org.neo4j.unsafe.impl.batchimport.NodeStoreProcessorStage;
import org.neo4j.unsafe.impl.batchimport.RelationshipCountsStage;
import org.neo4j.unsafe.impl.batchimport.cache.NodeLabelsCache;
import org.neo4j.unsafe.impl.batchimport.cache.NumberArrayFactory;
import static org.neo4j.unsafe.impl.batchimport.staging.ExecutionSupervisors.superviseDynamicExecution;
public class CountsComputer implements DataInitializer<CountsAccessor.Updater>
{
public static void recomputeCounts( NeoStore stores )
{
try ( CountsAccessor.Updater countsUpdater = stores.getCounts().reset() )
{
new CountsComputer( stores ).initialize( countsUpdater );
}
}
private final NodeStore nodes;
private final RelationshipStore relationships;
private final int highLabelId;
private final int highRelationshipTypeId;
private final long lastCommittedTransactionId;
public CountsComputer( NeoStore stores )
{
this( stores.getLastCommittedTransactionId(),
stores.getNodeStore(), stores.getRelationshipStore(),
(int) stores.getLabelTokenStore().getHighId(),
(int) stores.getRelationshipTypeTokenStore().getHighId() );
}
public CountsComputer( long lastCommittedTransactionId, NodeStore nodes, RelationshipStore relationships,
int highLabelId,
int highRelationshipTypeId )
{
this.lastCommittedTransactionId = lastCommittedTransactionId;
this.nodes = nodes;
this.relationships = relationships;
this.highLabelId = highLabelId;
this.highRelationshipTypeId = highRelationshipTypeId;
}
@Override
public void initialize( CountsAccessor.Updater countsUpdater )
{
NodeLabelsCache cache = new NodeLabelsCache( NumberArrayFactory.AUTO, highLabelId );
try
{
// Count nodes
superviseDynamicExecution( new NodeStoreProcessorStage( "COUNT NODES", Configuration.DEFAULT, nodes,
new NodeCountsProcessor( nodes, cache, highLabelId,
countsUpdater ) ) );
// Count relationships
superviseDynamicExecution( new RelationshipCountsStage( Configuration.DEFAULT, cache, relationships,
highLabelId, highRelationshipTypeId,
countsUpdater ) );
}
finally
{
cache.close();
}
}
@Override
public long initialVersion()
{
return lastCommittedTransactionId;
}
}