private async Task ProcessTransition(StateTransition <TActor, TStatus> transition)
{
var dispatched = false;
try
{
CancellationToken.ThrowIfCancellationRequested();
// Capture status value before executng the transition
TStatus prevStatus = transition.Source.Status;
var newStatus = await transition.ExecuteAsync();
await ChangeStatus(transition.Source, newStatus);
if (transition.Source.Status.Equals(prevStatus))
{
Logger.LogWarning("Status did not change during transition - possible logical error (status = {status}).", prevStatus);
}
// Place the actor to dispatcher queue
_dispatcher.Post(transition.Source);
dispatched = true;
}
catch (OperationCanceledException)
{
// Operation has been cancelled, simply drop the item
// Since the state did not change the item will be picked up again from the queue
}
catch (StateMachineException ex)
{
// Process terminated due to internal issues, log message and drop the item
// Since the state did not change the item will be picked up again from the queue
Logger.LogError(ex, ex.Message);
}
catch (StateTransitionException ex)
{
await SetErrorStatus(transition.Source, (TStatus)ex.ErrorStatus, ex.Message, ex.InnerException);
}
catch (Exception ex)
{
await SetErrorStatus(transition.Source, transition.ErrorStatus, ex.Message, ex);
}
finally
{
if (!dispatched)
{
_countdown.Release();
}
}
}
private void DispatchActor(TActor actor)
{
StateTransition <TActor, TStatus> transition = null;
try
{
transition = GetNextTransition(actor);
}
catch (Exception ex)
{
Logger.LogError(ex, "Error while getting next transition.");
}
if (transition != null && transition.Source != null)
{
_processor.Post(transition);
}
else
{
// No more tranistions found for this actor we should signal completion.
_countdown.Release();
}
}