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IterableStore.java
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IterableStore.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.consistency.checking.full;
import java.io.IOException;
import java.util.Iterator;
import org.neo4j.graphdb.ResourceIterable;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.helpers.collection.BoundedIterable;
import org.neo4j.kernel.impl.store.RecordStore;
import org.neo4j.kernel.impl.store.record.AbstractBaseRecord;
import static org.neo4j.consistency.checking.full.CloningRecordIterator.cloned;
import static org.neo4j.kernel.impl.store.Scanner.scan;
import static org.neo4j.kernel.impl.store.record.RecordLoad.FORCE;
public class IterableStore<RECORD extends AbstractBaseRecord> implements BoundedIterable<RECORD>
{
private final RecordStore<RECORD> store;
private final boolean forward;
private ResourceIterator<RECORD> iterator;
public IterableStore( RecordStore<RECORD> store, boolean forward )
{
this.store = store;
this.forward = forward;
}
@Override
public long maxCount()
{
return store.getHighId();
}
@Override
public void close() throws IOException
{
closeIterator();
}
private void closeIterator()
{
if ( iterator != null )
{
iterator.close();
iterator = null;
}
}
@Override
public Iterator<RECORD> iterator()
{
closeIterator();
ResourceIterable<RECORD> iterable = scan( store, forward );
return cloned( iterator = iterable.iterator() );
}
public void warmUpCache()
{
int recordsPerPage = store.getRecordsPerPage();
long id = 0;
long half = store.getHighId() / 2;
RECORD record = store.newRecord();
while ( id < half )
{
store.getRecord( id, record, FORCE );
id += (recordsPerPage - 1);
}
}
}