protected virtual async Task EntityIsDetachedAsync(MergeEvent @event, IDictionary copyCache, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
log.Debug("merging detached instance");
object entity = @event.Entity;
IEventSource source = @event.Session;
IEntityPersister persister = source.GetEntityPersister(@event.EntityName, entity);
string entityName = persister.EntityName;
object id = @event.RequestedId;
if (id == null)
{
id = persister.GetIdentifier(entity);
}
else
{
// check that entity id = requestedId
object entityId = persister.GetIdentifier(entity);
if (!persister.IdentifierType.IsEqual(id, entityId, source.Factory))
{
throw new HibernateException("merge requested with id not matching id of passed entity");
}
}
string previousFetchProfile = source.FetchProfile;
source.FetchProfile = "merge";
//we must clone embedded composite identifiers, or
//we will get back the same instance that we pass in
object clonedIdentifier = persister.IdentifierType.DeepCopy(id, source.Factory);
object result = await(source.GetAsync(persister.EntityName, clonedIdentifier, cancellationToken)).ConfigureAwait(false);
source.FetchProfile = previousFetchProfile;
if (result == null)
{
//TODO: we should throw an exception if we really *know* for sure
// that this is a detached instance, rather than just assuming
//throw new StaleObjectStateException(entityName, id);
// we got here because we assumed that an instance
// with an assigned id was detached, when it was
// really persistent
await(EntityIsTransientAsync(@event, copyCache, cancellationToken)).ConfigureAwait(false);
}
else
{
// NH different behavior : NH-1517
if (InvokeUpdateLifecycle(entity, persister, source))
{
return;
}
((EventCache)copyCache).Add(entity, result, true); //before cascade!
object target = source.PersistenceContext.Unproxy(result);
if (target == entity)
{
throw new AssertionFailure("entity was not detached");
}
else if (!(await(source.GetEntityNameAsync(target, cancellationToken)).ConfigureAwait(false)).Equals(entityName))
{
throw new WrongClassException("class of the given object did not match class of persistent copy",
@event.RequestedId, persister.EntityName);
}
else if (IsVersionChanged(entity, source, persister, target))
{
if (source.Factory.Statistics.IsStatisticsEnabled)
{
source.Factory.StatisticsImplementor.OptimisticFailure(entityName);
}
throw new StaleObjectStateException(persister.EntityName, id);
}
// cascade first, so that all unsaved objects get their
// copy created before we actually copy
await(CascadeOnMergeAsync(source, persister, entity, copyCache, cancellationToken)).ConfigureAwait(false);
await(CopyValuesAsync(persister, entity, target, source, copyCache, cancellationToken)).ConfigureAwait(false);
//copyValues works by reflection, so explicitly mark the entity instance dirty
MarkInterceptorDirty(entity, target);
@event.Result = result;
}
}