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NodeFirstGroupStage.java
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NodeFirstGroupStage.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.RecordStore;
import org.neo4j.kernel.impl.store.record.NodeRecord;
import org.neo4j.kernel.impl.store.record.RelationshipGroupRecord;
import org.neo4j.unsafe.impl.batchimport.cache.ByteArray;
import org.neo4j.unsafe.impl.batchimport.staging.BatchFeedStep;
import org.neo4j.unsafe.impl.batchimport.staging.ReadRecordsStep;
import org.neo4j.unsafe.impl.batchimport.staging.Stage;
import org.neo4j.unsafe.impl.batchimport.store.StorePrepareIdSequence;
import static org.neo4j.unsafe.impl.batchimport.RecordIdIterator.allIn;
/**
* Updates dense nodes with which will be the {@link NodeRecord#setNextRel(long) first group} to point to,
* after a {@link RelationshipGroupDefragmenter} has been run.
*/
public class NodeFirstGroupStage extends Stage
{
public static final String NAME = "Node --> Group";
public NodeFirstGroupStage( Configuration config, RecordStore<RelationshipGroupRecord> groupStore,
RecordStore<NodeRecord> nodeStore, ByteArray cache )
{
super( NAME, null, config, 0 );
add( new BatchFeedStep( control(), config, allIn( groupStore, config ), groupStore.getRecordSize() ) );
add( new ReadRecordsStep<>( control(), config, true, groupStore, null ) );
add( new NodeSetFirstGroupStep( control(), config, nodeStore, cache ) );
add( new UpdateRecordsStep<>( control(), config, nodeStore, new StorePrepareIdSequence() ) );
}
}