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BatchingDynamicRecordAllocator.java
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BatchingDynamicRecordAllocator.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.store;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.neo4j.kernel.impl.store.DynamicRecordAllocator;
import org.neo4j.kernel.impl.store.id.IdSequence;
import org.neo4j.kernel.impl.store.record.DynamicRecord;
import static java.lang.Integer.parseInt;
import static org.neo4j.graphdb.factory.GraphDatabaseSettings.string_block_size;
import static org.neo4j.kernel.impl.store.format.lowlimit.DynamicRecordFormat.RECORD_HEADER_SIZE;
/**
* {@link DynamicRecordAllocator} that allocates records using a {@link BatchingIdSequence}
* and makes available all allocated records.
*/
public class BatchingDynamicRecordAllocator implements DynamicRecordAllocator
{
private final int dataSize = parseInt( string_block_size.getDefaultValue() ) - RECORD_HEADER_SIZE;
private final IdSequence idSequence;
private final List<DynamicRecord> records = new ArrayList<>();
public BatchingDynamicRecordAllocator()
{
this( new BatchingIdSequence() );
}
public BatchingDynamicRecordAllocator( IdSequence idSequence )
{
this.idSequence = idSequence;
}
@Override
public int getRecordDataSize()
{
return dataSize;
}
@Override
public DynamicRecord nextUsedRecordOrNew( Iterator<DynamicRecord> recordsToUseFirst )
{
DynamicRecord record = new DynamicRecord( idSequence.nextId() );
record.setInUse( true );
records.add( record );
return record;
}
public List<DynamicRecord> records()
{
return records;
}
}