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SparseNodeFirstRelationshipStage.java
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SparseNodeFirstRelationshipStage.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.record.NodeRecord;
import org.neo4j.unsafe.impl.batchimport.cache.NodeRelationshipCache;
import org.neo4j.unsafe.impl.batchimport.cache.NodeType;
import org.neo4j.unsafe.impl.batchimport.staging.ReadRecordsStep;
import org.neo4j.unsafe.impl.batchimport.staging.Stage;
import static org.neo4j.unsafe.impl.batchimport.staging.Step.ORDER_SEND_DOWNSTREAM;
/**
* Updates sparse {@link NodeRecord node records} with relationship heads after relationship linking. Steps:
*
* <ol>
* <li>{@link ReadNodeIdsByCacheStep} looks at {@link NodeRelationshipCache} for which nodes have had
* relationships imported and loads those {@link NodeRecord records} from store.</li>
* <li>{@link RecordProcessorStep} / {@link SparseNodeFirstRelationshipProcessor} uses {@link NodeRelationshipCache}
* to update each {@link NodeRecord#setNextRel(long)}.
* <li>{@link UpdateRecordsStep} writes the updated records back into store.</li>
* </ol>
*/
public class SparseNodeFirstRelationshipStage extends Stage
{
public SparseNodeFirstRelationshipStage( String topic, Configuration config, NodeStore nodeStore,
NodeRelationshipCache cache )
{
super( "Node --> Relationship" + topic, config, ORDER_SEND_DOWNSTREAM );
add( new ReadNodeIdsByCacheStep( control(), config, cache, NodeType.NODE_TYPE_SPARSE ) );
add( new ReadRecordsStep<>( control(), config, true, nodeStore ) );
add( new RecordProcessorStep<>( control(), "LINK", config,
new SparseNodeFirstRelationshipProcessor( cache ), false ) );
add( new UpdateRecordsStep<>( control(), config, nodeStore ) );
}
}