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ReadNodeRecordsByCacheStep.java
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ReadNodeRecordsByCacheStep.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.unsafe.impl.batchimport;
import org.neo4j.kernel.impl.store.NodeStore;
import org.neo4j.kernel.impl.store.RecordCursor;
import org.neo4j.kernel.impl.store.record.NodeRecord;
import org.neo4j.kernel.impl.store.record.RecordLoad;
import org.neo4j.unsafe.impl.batchimport.cache.ByteArray;
import org.neo4j.unsafe.impl.batchimport.cache.NodeRelationshipCache;
import org.neo4j.unsafe.impl.batchimport.cache.NodeRelationshipCache.NodeChangeVisitor;
import org.neo4j.unsafe.impl.batchimport.staging.AbstractStep;
import org.neo4j.unsafe.impl.batchimport.staging.StageControl;
import static java.lang.System.nanoTime;
/**
* Using the {@link NodeRelationshipCache} efficiently looks for changed nodes and reads those
* {@link NodeRecord} and sends downwards.
*/
public class ReadNodeRecordsByCacheStep extends AbstractStep<Void>
{
private final int nodeTypes;
private final NodeRelationshipCache cache;
private final int batchSize;
private final RecordCursor<NodeRecord> recordCursor;
public ReadNodeRecordsByCacheStep( StageControl control, Configuration config,
NodeStore nodeStore, NodeRelationshipCache cache, int nodeTypes )
{
super( control, ">", config );
this.cache = cache;
this.nodeTypes = nodeTypes;
this.batchSize = config.batchSize();
this.recordCursor = nodeStore.newRecordCursor( nodeStore.newRecord() );
}
@Override
public void start( int orderingGuarantees )
{
super.start( orderingGuarantees );
recordCursor.acquire( 0, RecordLoad.NORMAL );
}
@Override
public void close() throws Exception
{
recordCursor.close();
super.close();
}
@Override
public long receive( long ticket, Void ignored )
{
new Thread()
{
@Override
public void run()
{
assertHealthy();
try ( NodeVisitor visitor = new NodeVisitor() )
{
cache.visitChangedNodes( visitor, nodeTypes );
}
endOfUpstream();
}
}.start();
return 0;
}
private class NodeVisitor implements NodeChangeVisitor, AutoCloseable
{
private NodeRecord[] batch = new NodeRecord[batchSize];
private int cursor;
private long time = nanoTime();
@Override
public void change( long nodeId, ByteArray array )
{
recordCursor.next( nodeId );
batch[cursor++] = recordCursor.get().clone();
if ( cursor == batchSize )
{
send();
batch = new NodeRecord[batchSize];
cursor = 0;
}
}
@SuppressWarnings( "unchecked" )
private void send()
{
totalProcessingTime.add( nanoTime() - time );
downstream.receive( doneBatches.getAndIncrement(), batch );
time = nanoTime();
assertHealthy();
}
@Override
public void close()
{
if ( cursor > 0 )
{
send();
}
}
}
}