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CommunityLockManger.java
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CommunityLockManger.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.locking.community;
import java.time.Clock;
import org.neo4j.kernel.configuration.Config;
import org.neo4j.kernel.impl.locking.Locks;
public class CommunityLockManger implements Locks
{
private final LockManagerImpl manager;
private volatile boolean closed;
public CommunityLockManger( Config config, Clock clock )
{
manager = new LockManagerImpl( new RagManager(), config, clock );
}
@Override
public Client newClient()
{
// We check this volatile closed flag here, which may seem like a contention overhead, but as the time
// of writing we apply pooling of transactions and in extension pooling of lock clients,
// so this method is called very rarely.
if ( closed )
{
throw new IllegalStateException( this + " already closed" );
}
return new CommunityLockClient( manager );
}
@Override
public void accept( final Visitor visitor )
{
manager.accept( element -> {
Object resource = element.resource();
if ( resource instanceof LockResource )
{
LockResource lockResource = (LockResource) resource;
visitor.visit( lockResource.type(), lockResource.resourceId(),
element.describe(), element.maxWaitTime(), System.identityHashCode( lockResource ) );
}
return false;
} );
}
@Override
public void close()
{
closed = true;
}
}