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CountsComputer.java
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CountsComputer.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.io.pagecache.PageCache;
import org.neo4j.kernel.impl.api.CountsAccessor;
import org.neo4j.kernel.impl.store.counts.CountsTracker;
import org.neo4j.kernel.impl.store.kvstore.DataInitializer;
import org.neo4j.kernel.impl.util.monitoring.ProgressReporter;
import org.neo4j.kernel.impl.util.monitoring.SilentProgressReporter;
import org.neo4j.unsafe.impl.batchimport.Configuration;
import org.neo4j.unsafe.impl.batchimport.NodeCountsStage;
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( NeoStores stores, PageCache pageCache )
{
MetaDataStore metaDataStore = stores.getMetaDataStore();
CountsTracker counts = stores.getCounts();
try ( CountsAccessor.Updater updater = counts.reset( metaDataStore.getLastCommittedTransactionId() ) )
{
new CountsComputer( stores, pageCache ).initialize( updater );
}
}
private static final int EMPTY_NODE_AND_RELATIONSHIP_STORE = -2;
private final NodeStore nodes;
private final RelationshipStore relationships;
private final int highLabelId;
private final int highRelationshipTypeId;
private final long lastCommittedTransactionId;
private final ProgressReporter progressMonitor;
private final NumberArrayFactory numberArrayFactory;
CountsComputer( NeoStores stores, PageCache pageCache )
{
this( stores.getMetaDataStore().getLastCommittedTransactionId(),
stores.getNodeStore(), stores.getRelationshipStore(),
(int) stores.getLabelTokenStore().getHighId(),
(int) stores.getRelationshipTypeTokenStore().getHighId(),
NumberArrayFactory.auto( pageCache, stores.getStoreDir(), true ) );
}
private CountsComputer( long lastCommittedTransactionId, NodeStore nodes, RelationshipStore relationships, int highLabelId, int highRelationshipTypeId,
NumberArrayFactory numberArrayFactory )
{
this( lastCommittedTransactionId, nodes, relationships, highLabelId, highRelationshipTypeId,
numberArrayFactory, SilentProgressReporter.INSTANCE );
}
public CountsComputer( long lastCommittedTransactionId, NodeStore nodes, RelationshipStore relationships,
int highLabelId, int highRelationshipTypeId, NumberArrayFactory numberArrayFactory, ProgressReporter progressMonitor )
{
this.lastCommittedTransactionId = lastCommittedTransactionId;
this.nodes = nodes;
this.relationships = relationships;
this.highLabelId = highLabelId;
this.highRelationshipTypeId = highRelationshipTypeId;
this.numberArrayFactory = numberArrayFactory;
this.progressMonitor = progressMonitor;
}
@Override
public void initialize( CountsAccessor.Updater countsUpdater )
{
long recordsToVisit = Math.addExact( nodes.getHighestPossibleIdInUse(), relationships.getHighestPossibleIdInUse() );
if ( recordsToVisit != EMPTY_NODE_AND_RELATIONSHIP_STORE )
{
progressMonitor.start( recordsToVisit );
populateCountStore( countsUpdater );
}
progressMonitor.completed();
}
private void populateCountStore( CountsAccessor.Updater countsUpdater )
{
try ( NodeLabelsCache cache = new NodeLabelsCache( numberArrayFactory, highLabelId ) )
{
// Count nodes
superviseDynamicExecution( new NodeCountsStage( Configuration.DEFAULT, cache, nodes, highLabelId, countsUpdater, progressMonitor ) );
// Count relationships
superviseDynamicExecution(
new RelationshipCountsStage( Configuration.DEFAULT, cache, relationships, highLabelId, highRelationshipTypeId, countsUpdater,
numberArrayFactory, progressMonitor ) );
}
}
@Override
public long initialVersion()
{
return lastCommittedTransactionId;
}
}