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ProcessRelationshipCountsDataStep.java
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ProcessRelationshipCountsDataStep.java
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/*
* Copyright (c) 2002-2018 "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.unsafe.impl.batchimport;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.neo4j.kernel.impl.api.CountsAccessor;
import org.neo4j.kernel.impl.store.record.RelationshipRecord;
import org.neo4j.kernel.impl.util.monitoring.ProgressReporter;
import org.neo4j.unsafe.impl.batchimport.cache.NodeLabelsCache;
import org.neo4j.unsafe.impl.batchimport.cache.NumberArrayFactory;
import org.neo4j.unsafe.impl.batchimport.staging.BatchSender;
import org.neo4j.unsafe.impl.batchimport.staging.ProcessorStep;
import org.neo4j.unsafe.impl.batchimport.staging.StageControl;
/**
* Processes relationship records, feeding them to {@link RelationshipCountsProcessor} which keeps
* the accumulated counts per thread. Aggregated in {@link #done()}.
*/
public class ProcessRelationshipCountsDataStep extends ProcessorStep<RelationshipRecord[]>
{
private final NodeLabelsCache cache;
private final Map<Thread,RelationshipCountsProcessor> processors = new ConcurrentHashMap<>();
private final int highLabelId;
private final int highRelationshipTypeId;
private final CountsAccessor.Updater countsUpdater;
private final NumberArrayFactory cacheFactory;
private final ProgressReporter progressMonitor;
public ProcessRelationshipCountsDataStep( StageControl control, NodeLabelsCache cache, Configuration config, int
highLabelId, int highRelationshipTypeId,
CountsAccessor.Updater countsUpdater, NumberArrayFactory cacheFactory,
ProgressReporter progressReporter )
{
super( control, "COUNT", config, 0 );
this.cache = cache;
this.highLabelId = highLabelId;
this.highRelationshipTypeId = highRelationshipTypeId;
this.countsUpdater = countsUpdater;
this.cacheFactory = cacheFactory;
this.progressMonitor = progressReporter;
}
@Override
protected void process( RelationshipRecord[] batch, BatchSender sender )
{
RelationshipCountsProcessor processor = processor();
for ( RelationshipRecord record : batch )
{
if ( record.inUse() )
{
processor.process( record );
}
}
progressMonitor.progress( batch.length );
}
private RelationshipCountsProcessor processor()
{
RelationshipCountsProcessor processor = processors.get( Thread.currentThread() );
if ( processor == null )
{ // This is OK since in this step implementation we use TaskExecutor which sticks to its threads.
// deterministically.
processors.put( Thread.currentThread(), processor = new RelationshipCountsProcessor(
cache, highLabelId, highRelationshipTypeId, countsUpdater, cacheFactory ) );
}
return processor;
}
@Override
protected void done()
{
super.done();
RelationshipCountsProcessor all = null;
for ( RelationshipCountsProcessor processor : processors.values() )
{
if ( all == null )
{
all = processor;
}
else
{
all.addCountsFrom( processor );
}
}
if ( all != null )
{
all.done();
}
}
}