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BatchFeedStep.java
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BatchFeedStep.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.staging;
import org.neo4j.unsafe.impl.batchimport.Configuration;
import org.neo4j.unsafe.impl.batchimport.RecordIdIterator;
/**
* Releases batches of record ids to be read, potentially in parallel, by downstream batches.
*/
public class BatchFeedStep extends IoProducerStep
{
private final RecordIdIterator ids;
private final int recordSize;
private volatile long count;
public BatchFeedStep( StageControl control, Configuration config, RecordIdIterator ids, int recordSize )
{
super( control, config );
this.ids = ids;
this.recordSize = recordSize;
}
@Override
protected Object nextBatchOrNull( long ticket, int batchSize )
{
count += batchSize;
return ids.nextBatch();
}
@Override
protected long position()
{
return count * recordSize;
}
}