
org.neo4j.kernel.database.LogEntryWriterFactory Maven / Gradle / Ivy
/*
* Copyright (c) "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 .
*/
package org.neo4j.kernel.database;
import javax.annotation.Nullable;
import org.neo4j.io.fs.WritableChecksumChannel;
import org.neo4j.kernel.KernelVersion;
import org.neo4j.kernel.impl.transaction.log.entry.LogEntryWriter;
/**
* The LogEntryWriterFactory is responsible for picking the transaction log format version to use for LogEntryWriters. The version should be the same in one
* complete transaction in the log but should be able to be upgraded without a restart. Therefore createEntryWriter should be used to get a new LogEntryWriter
* for each transaction.
*/
@FunctionalInterface
public interface LogEntryWriterFactory
{
LogEntryWriter createEntryWriter( T channel );
default LogEntryWriter createEntryWriter( T channel, @Nullable KernelVersion version )
{
return version == null ? createEntryWriter( channel ) : new LogEntryWriter<>( channel, version );
}
}
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