/**
* Attempts to resolve the entity id corresponding to the event's natural id values from the
* session
*
* @param event The load event
* @return The entity from the cache, or null.
*/
protected Serializable resolveFromCache(final ResolveNaturalIdEvent event) {
return event
.getSession()
.getPersistenceContext()
.getNaturalIdHelper()
.findCachedNaturalIdResolution(
event.getEntityPersister(), event.getOrderedNaturalIdValues());
}
/**
* Coordinates the efforts to load a given entity. First, an attempt is made to load the entity
* from the session-level cache. If not found there, an attempt is made to locate it in
* second-level cache. Lastly, an attempt is made to load it directly from the datasource.
*
* @param event The load event
* @return The loaded entity, or null.
*/
protected Serializable resolveNaturalId(final ResolveNaturalIdEvent event) {
final EntityPersister persister = event.getEntityPersister();
final boolean traceEnabled = LOG.isTraceEnabled();
if (traceEnabled)
LOG.tracev(
"Attempting to resolve: {0}",
MessageHelper.infoString(
persister, event.getNaturalIdValues(), event.getSession().getFactory()));
Serializable entityId = resolveFromCache(event);
if (entityId != null) {
if (traceEnabled)
LOG.tracev(
"Resolved object in cache: {0}",
MessageHelper.infoString(
persister, event.getNaturalIdValues(), event.getSession().getFactory()));
return entityId;
}
if (traceEnabled)
LOG.tracev(
"Object not resolved in any cache: {0}",
MessageHelper.infoString(
persister, event.getNaturalIdValues(), event.getSession().getFactory()));
return loadFromDatasource(event);
}
/**
* Performs the process of loading an entity from the configured underlying datasource.
*
* @param event The load event
* @return The object loaded from the datasource, or null if not found.
*/
protected Serializable loadFromDatasource(final ResolveNaturalIdEvent event) {
final SessionFactoryImplementor factory = event.getSession().getFactory();
final boolean stats = factory.getStatistics().isStatisticsEnabled();
long startTime = 0;
if (stats) {
startTime = System.currentTimeMillis();
}
final Serializable pk =
event
.getEntityPersister()
.loadEntityIdByNaturalId(
event.getOrderedNaturalIdValues(), event.getLockOptions(), event.getSession());
if (stats) {
final NaturalIdRegionAccessStrategy naturalIdCacheAccessStrategy =
event.getEntityPersister().getNaturalIdCacheAccessStrategy();
final String regionName =
naturalIdCacheAccessStrategy == null
? null
: naturalIdCacheAccessStrategy.getRegion().getName();
factory
.getStatisticsImplementor()
.naturalIdQueryExecuted(regionName, System.currentTimeMillis() - startTime);
}
// PK can be null if the entity doesn't exist
if (pk != null) {
event
.getSession()
.getPersistenceContext()
.getNaturalIdHelper()
.cacheNaturalIdCrossReferenceFromLoad(
event.getEntityPersister(), pk, event.getOrderedNaturalIdValues());
}
return pk;
}
@Override
public void onResolveNaturalId(ResolveNaturalIdEvent event) throws HibernateException {
final Serializable entityId = resolveNaturalId(event);
event.setEntityId(entityId);
}