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LockUnit.java
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LockUnit.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.kernel.impl.locking;
import org.neo4j.storageengine.api.lock.ResourceType;
/**
* Description of a lock that was deferred to commit time.
*/
public class LockUnit implements Comparable<LockUnit>, ActiveLock
{
private final ResourceType resourceType;
private final long resourceId;
private final boolean exclusive;
public LockUnit( ResourceType resourceType, long resourceId, boolean exclusive )
{
this.resourceType = resourceType;
this.resourceId = resourceId;
this.exclusive = exclusive;
}
@Override
public String mode()
{
return exclusive ? EXCLUSIVE_MODE : SHARED_MODE;
}
@Override
public ResourceType resourceType()
{
return resourceType;
}
@Override
public long resourceId()
{
return resourceId;
}
public boolean isExclusive()
{
return exclusive;
}
@Override
public int hashCode()
{
final int prime = 31;
int result = 1;
result = prime * result + (exclusive ? 1231 : 1237);
result = prime * result + (int) (resourceId ^ (resourceId >>> 32));
result = prime * result + resourceType.hashCode();
return result;
}
@Override
public boolean equals( Object obj )
{
if ( this == obj )
{
return true;
}
if ( obj == null )
{
return false;
}
if ( getClass() != obj.getClass() )
{
return false;
}
LockUnit other = (LockUnit) obj;
if ( exclusive != other.exclusive )
{
return false;
}
if ( resourceId != other.resourceId )
{
return false;
}
else if ( resourceType.typeId() != other.resourceType.typeId() )
{
return false;
}
return true;
}
@Override
public int compareTo( LockUnit o )
{
// Exclusive locks go first to minimize amount of potential deadlocks
int exclusiveCompare = Boolean.compare( o.exclusive, exclusive );
if ( exclusiveCompare != 0 )
{
return exclusiveCompare;
}
// Then shared/exclusive locks are compared by resourceTypeId and then by resourceId
return resourceType.typeId() == o.resourceType.typeId() ? Long.compare( resourceId, o.resourceId )
: Integer.compare( resourceType.typeId(), o.resourceType.typeId() );
}
@Override
public String toString()
{
return "Resource [resourceType=" + resourceType + ", resourceId=" + resourceId + ", exclusive=" + exclusive
+ "]";
}
}