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IdentityModule.java
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IdentityModule.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j Enterprise Edition. The included source
* code can be redistributed and/or modified under the terms of the
* GNU AFFERO GENERAL PUBLIC LICENSE Version 3
* (http://www.fsf.org/licensing/licenses/agpl-3.0.html) with the
* Commons Clause, as found in the associated LICENSE.txt file.
*
* 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.
*
* Neo4j object code can be licensed independently from the source
* under separate terms from the AGPL. Inquiries can be directed to:
* licensing@neo4j.com
*
* More information is also available at:
* https://neo4j.com/licensing/
*/
package org.neo4j.causalclustering.core;
import java.io.File;
import java.io.IOException;
import java.util.UUID;
import org.neo4j.causalclustering.core.state.storage.SimpleFileStorage;
import org.neo4j.causalclustering.core.state.storage.SimpleStorage;
import org.neo4j.causalclustering.identity.MemberId;
import org.neo4j.graphdb.factory.module.PlatformModule;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;
public class IdentityModule
{
public static final String CORE_MEMBER_ID_NAME = "core-member-id";
private MemberId myself;
IdentityModule( PlatformModule platformModule, File clusterStateDirectory )
{
FileSystemAbstraction fileSystem = platformModule.fileSystem;
LogProvider logProvider = platformModule.logging.getInternalLogProvider();
Log log = logProvider.getLog( getClass() );
SimpleStorage<MemberId> memberIdStorage = new SimpleFileStorage<>( fileSystem, clusterStateDirectory,
CORE_MEMBER_ID_NAME, new MemberId.Marshal(), logProvider );
try
{
if ( memberIdStorage.exists() )
{
myself = memberIdStorage.readState();
if ( myself == null )
{
throw new RuntimeException( "I was null" );
}
}
else
{
UUID uuid = UUID.randomUUID();
myself = new MemberId( uuid );
memberIdStorage.writeState( myself );
log.info( String.format( "Generated new id: %s (%s)", myself, uuid ) );
}
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
platformModule.jobScheduler.setTopLevelGroupName( "Core " + myself );
}
public MemberId myself()
{
return myself;
}
}