protected virtual async Task <bool> HandleInterceptionAsync(FlushEntityEvent @event, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
ISessionImplementor session = @event.Session;
EntityEntry entry = @event.EntityEntry;
IEntityPersister persister = entry.Persister;
object entity = @event.Entity;
//give the Interceptor a chance to modify property values
object[] values = @event.PropertyValues;
bool intercepted = InvokeInterceptor(session, entity, entry, values, persister);
//now we might need to recalculate the dirtyProperties array
if (intercepted && @event.DirtyCheckPossible && [email protected])
{
int[] dirtyProperties;
if (@event.HasDatabaseSnapshot)
{
dirtyProperties = await(persister.FindModifiedAsync(@event.DatabaseSnapshot, values, entity, session, cancellationToken)).ConfigureAwait(false);
}
else
{
dirtyProperties = await(persister.FindDirtyAsync(values, entry.LoadedState, entity, session, cancellationToken)).ConfigureAwait(false);
}
@event.DirtyProperties = dirtyProperties;
}
return(intercepted);
}
/// <summary> Perform a dirty check, and attach the results to the event</summary>
protected virtual async Task DirtyCheckAsync(FlushEntityEvent @event, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
object entity = @event.Entity;
object[] values = @event.PropertyValues;
ISessionImplementor session = @event.Session;
EntityEntry entry = @event.EntityEntry;
IEntityPersister persister = entry.Persister;
object id = entry.Id;
object[] loadedState = entry.LoadedState;
int[] dirtyProperties = session.Interceptor.FindDirty(entity, id, values, loadedState, persister.PropertyNames, persister.PropertyTypes);
@event.DatabaseSnapshot = null;
bool interceptorHandledDirtyCheck;
bool cannotDirtyCheck;
if (dirtyProperties == null)
{
// Interceptor returned null, so do the dirtycheck ourself, if possible
interceptorHandledDirtyCheck = false;
cannotDirtyCheck = loadedState == null; // object loaded by update()
if (!cannotDirtyCheck)
{
// dirty check against the usual snapshot of the entity
dirtyProperties = await(persister.FindDirtyAsync(values, loadedState, entity, session, cancellationToken)).ConfigureAwait(false);
}
else if (entry.Status == Status.Deleted && [email protected]())
{
// A non-modifiable (e.g., read-only or immutable) entity needs to be have
// references to transient entities set to null before being deleted. No other
// fields should be updated.
if (values != entry.DeletedState)
{
throw new InvalidOperationException("Entity has status Status.Deleted but values != entry.DeletedState");
}
// Even if loadedState == null, we can dirty-check by comparing currentState and
// entry.getDeletedState() because the only fields to be updated are those that
// refer to transient entities that are being set to null.
// - currentState contains the entity's current property values.
// - entry.getDeletedState() contains the entity's current property values with
// references to transient entities set to null.
// - dirtyProperties will only contain properties that refer to transient entities
object[] currentState = persister.GetPropertyValues(@event.Entity);
dirtyProperties = await(persister.FindDirtyAsync(entry.DeletedState, currentState, entity, session, cancellationToken)).ConfigureAwait(false);
cannotDirtyCheck = false;
}
else
{
// dirty check against the database snapshot, if possible/necessary
object[] databaseSnapshot = await(GetDatabaseSnapshotAsync(session, persister, id, cancellationToken)).ConfigureAwait(false);
if (databaseSnapshot != null)
{
dirtyProperties = await(persister.FindModifiedAsync(databaseSnapshot, values, entity, session, cancellationToken)).ConfigureAwait(false);
cannotDirtyCheck = false;
@event.DatabaseSnapshot = databaseSnapshot;
}
}
}
else
{
// the Interceptor handled the dirty checking
cannotDirtyCheck = false;
interceptorHandledDirtyCheck = true;
}
@event.DirtyProperties = dirtyProperties;
@event.DirtyCheckHandledByInterceptor = interceptorHandledDirtyCheck;
@event.DirtyCheckPossible = !cannotDirtyCheck;
}
