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ReadRecordsStep.java
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ReadRecordsStep.java
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/*
* Copyright (c) 2002-2016 "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 java.lang.reflect.Array;
import java.util.stream.Stream;
import org.neo4j.kernel.impl.store.RecordCursor;
import org.neo4j.kernel.impl.store.RecordStore;
import org.neo4j.kernel.impl.store.id.validation.IdValidator;
import org.neo4j.kernel.impl.store.record.AbstractBaseRecord;
import static org.neo4j.kernel.impl.store.record.RecordLoad.CHECK;
/**
* Reads records from a {@link RecordStore} and sends batches of those records downstream.
* A {@link RecordCursor} is used during the life cycle of this {@link Step}, e.g. between
* {@link #start(int)} and {@link #close()}.
*
* @param <RECORD> type of {@link AbstractBaseRecord}
*/
public abstract class ReadRecordsStep<RECORD extends AbstractBaseRecord> extends IoProducerStep
{
protected final RecordStore<RECORD> store;
protected final RECORD record;
protected final RecordCursor<RECORD> cursor;
protected final long highId;
public ReadRecordsStep( StageControl control, Configuration config, RecordStore<RECORD> store )
{
super( control, config );
this.store = store;
this.cursor = store.newRecordCursor( record = store.newRecord() );
this.highId = store.getHighId();
}
@Override
public void start( int orderingGuarantees )
{
cursor.acquire( 0, CHECK );
super.start( orderingGuarantees );
}
@Override
public void close() throws Exception
{
super.close();
cursor.close();
}
protected RECORD[] removeRecordWithReservedId( RECORD[] records, boolean seenReservedId )
{
if ( !seenReservedId )
{
return records;
}
return Stream.of( records )
.filter( record -> !IdValidator.isReservedId( record.getId() ) )
.toArray( length -> newArray( length, records.getClass().getComponentType() ) );
}
@SuppressWarnings( "unchecked" )
private RECORD[] newArray( int length, Class<?> componentType )
{
return (RECORD[]) Array.newInstance( componentType, length );
}
}