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TokenStore.java
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TokenStore.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.kernel.impl.store;
import java.io.File;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.store.format.RecordFormat;
import org.neo4j.kernel.impl.store.id.IdGeneratorFactory;
import org.neo4j.kernel.impl.store.id.IdType;
import org.neo4j.kernel.impl.store.record.DynamicRecord;
import org.neo4j.kernel.impl.store.record.Record;
import org.neo4j.kernel.impl.store.record.RecordLoad;
import org.neo4j.kernel.impl.store.record.TokenRecord;
import org.neo4j.logging.LogProvider;
import org.neo4j.storageengine.api.Token;
import org.neo4j.storageengine.api.TokenFactory;
import static org.neo4j.kernel.impl.store.NoStoreHeaderFormat.NO_STORE_HEADER_FORMAT;
import static org.neo4j.kernel.impl.store.PropertyStore.decodeString;
import static org.neo4j.kernel.impl.store.record.RecordLoad.NORMAL;
public abstract class TokenStore<RECORD extends TokenRecord,TOKEN extends Token>
extends CommonAbstractStore<RECORD,NoStoreHeader>
{
public static final int NAME_STORE_BLOCK_SIZE = 30;
private final DynamicStringStore nameStore;
private final TokenFactory<TOKEN> tokenFactory;
public TokenStore(
File file,
Config configuration,
IdType idType,
IdGeneratorFactory idGeneratorFactory,
PageCache pageCache,
LogProvider logProvider,
DynamicStringStore nameStore,
String typeDescriptor,
TokenFactory<TOKEN> tokenFactory,
RecordFormat<RECORD> recordFormat,
String storeVersion )
{
super( file, configuration, idType, idGeneratorFactory, pageCache, logProvider, typeDescriptor,
recordFormat, NO_STORE_HEADER_FORMAT, storeVersion );
this.nameStore = nameStore;
this.tokenFactory = tokenFactory;
}
public DynamicStringStore getNameStore()
{
return nameStore;
}
@Override
protected boolean isOnlyFastIdGeneratorRebuildEnabled( Config config )
{
return false;
}
public List<TOKEN> getTokens( int maxCount )
{
LinkedList<TOKEN> records = new LinkedList<>();
long maxIdInUse = getHighestPossibleIdInUse();
int found = 0;
RECORD record = newRecord();
for ( int i = 0; i <= maxIdInUse && found < maxCount; i++ )
{
if ( !getRecord( i, record, RecordLoad.CHECK ).inUse() )
{
continue;
}
found++;
if ( record != null && record.inUse() && record.getNameId() != Record.RESERVED.intValue() )
{
records.add( tokenFactory.newToken( getStringFor( record ), i ) );
}
}
return records;
}
public TOKEN getToken( int id )
{
RECORD record = getRecord( id, newRecord(), NORMAL );
return tokenFactory.newToken( getStringFor( record ), record.getIntId() );
}
public Collection<DynamicRecord> allocateNameRecords( byte[] chars )
{
Collection<DynamicRecord> records = new ArrayList<>();
nameStore.allocateRecordsFromBytes( records, chars );
return records;
}
@Override
public void updateRecord( RECORD record )
{
super.updateRecord( record );
if ( !record.isLight() )
{
for ( DynamicRecord keyRecord : record.getNameRecords() )
{
nameStore.updateRecord( keyRecord );
}
}
}
@Override
public void ensureHeavy( RECORD record )
{
if ( !record.isLight() )
{
return;
}
record.addNameRecords( nameStore.getRecords( record.getNameId(), NORMAL ) );
}
public String getStringFor( RECORD nameRecord )
{
ensureHeavy( nameRecord );
int recordToFind = nameRecord.getNameId();
Iterator<DynamicRecord> records = nameRecord.getNameRecords().iterator();
Collection<DynamicRecord> relevantRecords = new ArrayList<>();
while ( recordToFind != Record.NO_NEXT_BLOCK.intValue() && records.hasNext() )
{
DynamicRecord record = records.next();
if ( record.inUse() && record.getId() == recordToFind )
{
recordToFind = (int) record.getNextBlock();
// TODO: optimize here, high chance next is right one
relevantRecords.add( record );
records = nameRecord.getNameRecords().iterator();
}
}
return decodeString( nameStore.readFullByteArray( relevantRecords, PropertyType.STRING ).other() );
}
}