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LockResource.java
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LockResource.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 org.neo4j.helpers.MathUtil;
import org.neo4j.storageengine.api.lock.ResourceType;
public class LockResource
{
private final ResourceType resourceType;
private final long resourceId;
/** Local reference count, used for each client to count references to a lock. */
private int refCount = 1;
public LockResource( ResourceType resourceType, long resourceId )
{
this.resourceType = resourceType;
this.resourceId = resourceId;
}
@Override
public boolean equals( Object o )
{
if ( this == o )
{
return true;
}
if ( o == null || getClass() != o.getClass() )
{
return false;
}
LockResource that = (LockResource) o;
if ( resourceId != that.resourceId )
{
return false;
}
if ( !resourceType.equals( that.resourceType ) )
{
return false;
}
return true;
}
@Override
public int hashCode()
{
int result = resourceType.hashCode();
result = 31 * result + (int) (resourceId ^ (resourceId >>> 32));
return result;
}
@Override
public String toString()
{
return String.format( "%s(%d)", resourceType, resourceId );
}
public void acquireReference()
{
refCount = Math.incrementExact( refCount );
}
public int releaseReference()
{
return refCount = MathUtil.decrementExactNotPastZero( refCount );
}
public long resourceId()
{
return resourceId;
}
public ResourceType type()
{
return resourceType;
}
}