/// <summary>
/// Simulates the processing of a restock request by advancing the processing status each time this method is invoked
/// until it reaches the complete stage.
/// </summary>
/// <returns></returns>
internal async Task RestockPipeline()
{
RestockRequestActorState state = await this.StateManager.GetStateAsync <RestockRequestActorState>(ActorStatePropertyName);
ActorEventSource.Current.ActorMessage(this, "RestockRequestActor: {0}: Pipeline change reminder", state);
switch (state.Status)
{
case RestockRequestStatus.Accepted:
// Change to next step and let it "execute" until the reminder fires again
state.Status = RestockRequestStatus.Manufacturing;
break;
case RestockRequestStatus.Manufacturing:
// Changet the step to completed to indicate the "processing" is complete.
state.Status = RestockRequestStatus.Completed;
// Raise the event to let interested parties (RestockRequestManager) know that the restock is complete
this.SignalRequestStatusChange(state);
// Done, so unregister the reminder
await this.UnregisterRestockPipelineChangeReminderAsync();
break;
default:
throw new InvalidOperationException(string.Format("{0}: remainder received in invalid status", state));
}
await this.StateManager.SetStateAsync <RestockRequestActorState>(ActorStatePropertyName, state);
return;
}
/// <summary>
/// Accepts a restock request and changes the Actor's state accordingly. The request is processed
/// async and the caller will be notified when the processing is done.
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public async Task AddRestockRequestAsync(RestockRequest request)
{
RestockRequestActorState state = await this.StateManager.GetStateAsync <RestockRequestActorState>(ActorStatePropertyName);
if (state.IsStarted()) //Don't accept a request that is already started
{
ActorEventSource.Current.Message(string.Format("RestockRequestActor: {0}: Can't accept restock request in this state", state));
throw new InvalidOperationException(string.Format("{0}: Can't accept restock request in this state", state));
}
// Accept the request
ActorEventSource.Current.ActorMessage(this, "RestockRequestActor: Accept update quantity request {0}", request);
state.Status = RestockRequestStatus.Accepted;
state.Request = request;
await this.StateManager.SetStateAsync <RestockRequestActorState>(ActorStatePropertyName, state);
// Start a reminder to go through the processing pipeline.
// A reminder keeps the actor from being garbage collected due to lack of use,
// which works better than a timer in this case.
await this.RegisterReminderAsync(
RestockRequestReminderNames.RestockPipelineChangeReminderName,
null,
PipelineStageVerificationDelay,
PipelineStageProcessingDuration);
return;
}
private void SignalRequestStatusChange(RestockRequestActorState state)
{
ActorEventSource.Current.ActorMessage(this, "RestockRequestActor: {0}: Raise event for state change", state);
IRestockRequestEvents events = this.GetEvent <IRestockRequestEvents>();
events.RestockRequestCompleted(this.Id, state.Request);
}
private void SignalRequestStatusChange(RestockRequestActorState state)
{
ActorEventSource.Current.ActorMessage(this, "RestockRequestActor: {0}: Raise event for state change", state);
IRestockRequestEvents events = this.GetEvent<IRestockRequestEvents>();
events.RestockRequestCompleted(this.Id, state.Request);
}