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CommittedRecords.java
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CommittedRecords.java
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/*
* Copyright (c) 2002-2015 "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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.tools.txlog;
import org.neo4j.collection.primitive.Primitive;
import org.neo4j.collection.primitive.PrimitiveLongObjectMap;
import org.neo4j.kernel.impl.store.record.Abstract64BitRecord;
import org.neo4j.kernel.impl.store.record.NodeRecord;
import org.neo4j.kernel.impl.store.record.PropertyRecord;
import org.neo4j.tools.txlog.checktypes.CheckType;
/**
* Contains mapping from entity id ({@link NodeRecord#getId()}, {@link PropertyRecord#getId()}, ...) to
* {@linkplain Abstract64BitRecord record} for records that have been previously seen during transaction log scan.
* <p/>
* Can determine if some given record is consistent with previously committed state.
*
* @param <R> the type of the record
*/
class CommittedRecords<R extends Abstract64BitRecord>
{
private final CheckType<?,R> checkType;
private final PrimitiveLongObjectMap<LogRecord<R>> recordsById;
CommittedRecords( CheckType<?,R> check )
{
this.checkType = check;
this.recordsById = Primitive.longObjectMap();
}
boolean isValid( R record )
{
LogRecord<R> current = recordsById.get( record.getId() );
return current == null || checkType.equal( record, current.record() );
}
void put( R record, long logVersion )
{
recordsById.put( record.getId(), new LogRecord<>( record, logVersion ) );
}
LogRecord<R> get( long id )
{
return recordsById.get( id );
}
@Override
public String toString()
{
return "CommittedRecords{" + "command=" + checkType.name() + ", recordsById.size=" + recordsById.size() + "}";
}
}