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SchemaStore.java
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SchemaStore.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.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.nio.ByteBuffer;
import java.nio.file.OpenOption;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.neo4j.io.pagecache.PageCache;
import org.neo4j.kernel.api.exceptions.schema.MalformedSchemaRuleException;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.store.allocator.ReusableRecordsCompositeAllocator;
import org.neo4j.kernel.impl.store.format.RecordFormats;
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.SchemaRuleSerialization;
import org.neo4j.logging.LogProvider;
import org.neo4j.storageengine.api.schema.SchemaRule;
import static java.util.Collections.singleton;
import static org.neo4j.kernel.impl.store.record.RecordLoad.CHECK;
public class SchemaStore extends AbstractDynamicStore implements Iterable<SchemaRule>
{
// store version, each store ends with this string (byte encoded)
public static final String TYPE_DESCRIPTOR = "SchemaStore";
public static final int BLOCK_SIZE = 56;
public SchemaStore(
File fileName,
Config conf,
IdType idType,
IdGeneratorFactory idGeneratorFactory,
PageCache pageCache,
LogProvider logProvider,
RecordFormats recordFormats,
OpenOption... openOptions )
{
super( fileName, conf, idType, idGeneratorFactory, pageCache, logProvider, TYPE_DESCRIPTOR, BLOCK_SIZE,
recordFormats.dynamic(), recordFormats.storeVersion(), openOptions );
}
@Override
public <FAILURE extends Exception> void accept( Processor<FAILURE> processor, DynamicRecord record ) throws FAILURE
{
processor.processSchema( this, record );
}
public List<DynamicRecord> allocateFrom( SchemaRule rule )
{
List<DynamicRecord> records = new ArrayList<>();
DynamicRecord record = getRecord( rule.getId(), nextRecord(), CHECK );
DynamicRecordAllocator recordAllocator = new ReusableRecordsCompositeAllocator( singleton( record ), this );
allocateRecordsFromBytes( records, SchemaRuleSerialization.serialize( rule ), recordAllocator );
return records;
}
public Iterator<SchemaRule> loadAllSchemaRules()
{
return new SchemaStorage( this ).loadAllSchemaRules();
}
@Override
public Iterator<SchemaRule> iterator()
{
return loadAllSchemaRules();
}
static SchemaRule readSchemaRule( long id, Collection<DynamicRecord> records, byte[] buffer )
throws MalformedSchemaRuleException
{
ByteBuffer scratchBuffer = concatData( records, buffer );
return SchemaRuleSerialization.deserialize( id, scratchBuffer );
}
}