Package org.keycloak.models.map.storage.jpa.hibernate.listeners

Class JpaOptimisticLockingListener

java.lang.Object

org.keycloak.models.map.storage.jpa.hibernate.listeners.JpaOptimisticLockingListener

All Implemented Interfaces:

org.hibernate.event.spi.PreDeleteEventListener, org.hibernate.event.spi.PreInsertEventListener, org.hibernate.event.spi.PreUpdateEventListener

public class JpaOptimisticLockingListener
extends Object
implements org.hibernate.event.spi.PreInsertEventListener, org.hibernate.event.spi.PreDeleteEventListener, org.hibernate.event.spi.PreUpdateEventListener

Listen on changes on child entities and forces an optimistic locking increment on the closest parent aka root. The assumption is that any parent of a child entity is root entity. Optimistic locking is enforced on child entity which is not the child entity at the same time. This prevents OptimisticLockExceptions when different children in the same parent are being manipulated at the same time by different threads. This support a multiple level parent-child relationship, where only the closest parent is locked.

Field Summary

Fields

Modifier and Type	Field	Description
static final JpaOptimisticLockingListener	INSTANCE

Constructor Summary

Constructors

Constructor	Description
JpaOptimisticLockingListener()

Method Summary

Modifier and Type	Method	Description
void	lockRootEntity(org.hibernate.Session session, Object entity)	Check if the entity is a child with a parent and force optimistic locking increment on the parent aka root.
boolean	onPreDelete(org.hibernate.event.spi.PreDeleteEvent event)
boolean	onPreInsert(org.hibernate.event.spi.PreInsertEvent event)
boolean	onPreUpdate(org.hibernate.event.spi.PreUpdateEvent event)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

INSTANCE

public static final JpaOptimisticLockingListener INSTANCE

Constructor Details

JpaOptimisticLockingListener

public JpaOptimisticLockingListener()

Method Details

lockRootEntity

public void lockRootEntity(org.hibernate.Session session,
 Object entity)
                    throws org.hibernate.HibernateException

Check if the entity is a child with a parent and force optimistic locking increment on the parent aka root.

Throws:

org.hibernate.HibernateException

onPreInsert

public boolean onPreInsert(org.hibernate.event.spi.PreInsertEvent event)

Specified by:

onPreInsert in interface org.hibernate.event.spi.PreInsertEventListener

onPreDelete

public boolean onPreDelete(org.hibernate.event.spi.PreDeleteEvent event)

Specified by:

onPreDelete in interface org.hibernate.event.spi.PreDeleteEventListener

onPreUpdate

public boolean onPreUpdate(org.hibernate.event.spi.PreUpdateEvent event)

Specified by:

onPreUpdate in interface org.hibernate.event.spi.PreUpdateEventListener