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NodeDegreeCountStage.java
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NodeDegreeCountStage.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 static org.neo4j.unsafe.impl.batchimport.RecordIdIterator.forwards;
import static org.neo4j.unsafe.impl.batchimport.staging.Step.ORDER_SEND_DOWNSTREAM;
import org.neo4j.kernel.impl.store.RelationshipStore;
import org.neo4j.unsafe.impl.batchimport.cache.NodeRelationshipCache;
import org.neo4j.unsafe.impl.batchimport.staging.BatchFeedStep;
import org.neo4j.unsafe.impl.batchimport.staging.ReadRecordsStep;
import org.neo4j.unsafe.impl.batchimport.staging.Stage;
/**
* Goes through {@link RelationshipStore} and increments counts per start/end node,
* calling {@link NodeRelationshipCache#incrementCount(long)}. This is in preparation of linking relationships.
*/
public class NodeDegreeCountStage extends Stage
{
public NodeDegreeCountStage( Configuration config, RelationshipStore store, NodeRelationshipCache cache )
{
super( "Node Degrees", config );
add( new BatchFeedStep( control(), config, forwards( 0, store.getHighId(), config ), store.getRecordSize() ) );
add( new ReadRecordsStep<>( control(), config, false, store, null ) );
add( new CalculateDenseNodesStep( control(), config, cache ) );
}
}