private static async Task InvokeListenerOnAfterExecutionState(StateExecutionContext stateExecutionContext, IStateListener stateListener, StateExecutionResult stateExecutionResult, CancellationToken cancellationToken = default) { if (null == stateListener) { return; } Log.Verbose("State has been processed [{state}] listener [after state] [{workflowInstanceID}]", stateExecutionContext.StateConfiguration.Code, stateExecutionContext.WorkflowContext.WorkflowInstance.Id); try { await stateListener.AfterExecutionState(stateExecutionContext, stateExecutionResult, cancellationToken).ConfigureAwait(false); } catch (Exception ex) { throw new WorkflowException(string.Format(CultureInfo.InvariantCulture, "An error has occurred during execution of an state [{0}] listener [after state] for workflow instance [{1}]", stateExecutionContext.StateConfiguration.Code, stateExecutionContext.WorkflowContext.WorkflowInstance.Id), ex); } }
public async Task <StateExecutionResult> Process(StateExecutionContext stateExecutionContext, CancellationToken cancellationToken = default) { // 1. log starting // 2. listener --> before processing // 3. run activities // 3.1. execute all synchronous activities // 3.2. TODO: schedule all asynchronous activities // 4. listener --> after activities // 5. if state is final --> report and exit // 6. evaluate non-delayed transitions // 6.1. coded transitions // 6.2. compiled conditions // 7. schedule all delayed transitions // 8. log finishing IStateListener stateListener = null; StateExecutionResult stateExecutionResult = null; var workflowInstance = stateExecutionContext.WorkflowContext.WorkflowInstance; try { Log.Verbose("Starting processing state [{type}::{state}] [{workflowInstanceId}]", stateExecutionContext.StateConfiguration.Type, stateExecutionContext.StateConfiguration.Code, stateExecutionContext.WorkflowContext.WorkflowInstance.Id); workflowInstance.CurrentStateCode = stateExecutionContext.StateConfiguration.Code; workflowInstance.CurrentStateProgress = StateExecutionProgress.Started; await _workflowEngine.SaveWorkflowInstance(workflowInstance, cancellationToken).ConfigureAwait(false); stateListener = GetStateListener(stateExecutionContext.WorkflowContext); workflowInstance.CurrentStateProgress = StateExecutionProgress.BeforeActivities; await InvokeListenerOnBeforeExecutingState(stateExecutionContext, stateListener, cancellationToken).ConfigureAwait(false); var activityExecutionResult = await ExecuteSynchronousActivities(stateExecutionContext, cancellationToken).ConfigureAwait(false); if (activityExecutionResult.Status.IsFailed()) { workflowInstance.CurrentStateProgress = StateExecutionProgress.Completed; if (!string.IsNullOrEmpty(activityExecutionResult.TransitionToUse)) { var transitionConfiguration = stateExecutionContext.StateConfiguration.Transitions.FirstOrDefault(tc => string.Equals(tc.MoveToState, activityExecutionResult.TransitionToUse, StringComparison.OrdinalIgnoreCase)); if (null == transitionConfiguration) { throw new WorkflowException(string.Format(CultureInfo.InvariantCulture, "Cannot not find transition [{0}] for failed activity in status [{1}], [workflow ID={2:D}]", activityExecutionResult.TransitionToUse, stateExecutionContext.StateConfiguration.Code, stateExecutionContext.WorkflowContext.WorkflowInstance.Id)); } Log.Verbose("[{type}::{state}] has been failed, transitioning to custom {failureState} [{workflowInstanceId}]", stateExecutionContext.StateConfiguration.Type, stateExecutionContext.StateConfiguration.Code, transitionConfiguration.MoveToState, stateExecutionContext.WorkflowContext.WorkflowInstance.Id); // stateExecutionResult is being used later in the final block stateExecutionResult = new StateExecutionResult(StateExecutionStatus.Failed, new StateExecutionTransition(StateTypeConfiguration.Application, transitionConfiguration)); return(stateExecutionResult); } Log.Verbose("[{type}::{state}] has been failed [{workflowInstanceId}]", stateExecutionContext.StateConfiguration.Type, stateExecutionContext.StateConfiguration.Code, stateExecutionContext.WorkflowContext.WorkflowInstance.Id); // stateExecutionResult is being used later in the final block stateExecutionResult = new StateExecutionResult(StateExecutionStatus.Failed, new StateExecutionTransition(StateTypeConfiguration.Failed, null)); return(stateExecutionResult); } workflowInstance.CurrentStateProgress = StateExecutionProgress.AfterActivitiesProcessed; await _workflowEngine.SaveWorkflowInstance(workflowInstance, cancellationToken).ConfigureAwait(false); await InvokeListenerOnAfterExecutionActivities(stateExecutionContext, stateListener, cancellationToken).ConfigureAwait(false); if (stateExecutionContext.StateConfiguration.Type == StateTypeConfiguration.Failed || stateExecutionContext.StateConfiguration.Type == StateTypeConfiguration.Final) { Log.Verbose("[{type}::{state}] has been completed [{workflowInstanceId}]", stateExecutionContext.StateConfiguration.Type, stateExecutionContext.StateConfiguration.Code, stateExecutionContext.WorkflowContext.WorkflowInstance.Id); workflowInstance.CurrentStateProgress = StateExecutionProgress.Completed; await _workflowEngine.SaveWorkflowInstance(workflowInstance, cancellationToken).ConfigureAwait(false); // stateExecutionResult is being used later in the final block stateExecutionResult = new StateExecutionResult(StateExecutionStatus.Finished, new StateExecutionTransition(StateTypeConfiguration.Undefined, null)); return(stateExecutionResult); } workflowInstance.CurrentStateProgress = StateExecutionProgress.BeforeTransitions; await _workflowEngine.SaveWorkflowInstance(workflowInstance, cancellationToken).ConfigureAwait(false); var stateExecutionTransition = await EvaluateNonDelayTransitions(stateExecutionContext, cancellationToken).ConfigureAwait(false); var delayedStateExecutionTransitions = GetDelayedTransitions(stateExecutionContext); if (stateExecutionTransition.NextStateType == StateTypeConfiguration.Undefined && null == delayedStateExecutionTransitions) { throw new WorkflowException(string.Format(CultureInfo.InvariantCulture, "Cannot evaluate transition(s) for non final state [{0}], [workflow ID={1:D}]", stateExecutionContext.StateConfiguration.Code, stateExecutionContext.WorkflowContext.WorkflowInstance.Id)); } if (null != delayedStateExecutionTransitions) { await ScheduleDelayedTransitions(stateExecutionContext, delayedStateExecutionTransitions, cancellationToken) .ConfigureAwait(false); } workflowInstance.CurrentStateProgress = StateExecutionProgress.Completed; await _workflowEngine.SaveWorkflowInstance(workflowInstance, cancellationToken).ConfigureAwait(false); stateExecutionResult = new StateExecutionResult(StateExecutionStatus.Completed, stateExecutionTransition); return(stateExecutionResult); } catch (Exception ex) { Log.Error(ex, "An error has occurred during processing state [{type}::{state}] [{workflowInstanceId}]", stateExecutionContext.StateConfiguration.Type, stateExecutionContext.StateConfiguration.Code, stateExecutionContext.WorkflowContext.WorkflowInstance.Id); workflowInstance.CurrentStateProgress = StateExecutionProgress.Completed; if (stateExecutionContext.StateConfiguration.Type == StateTypeConfiguration.Failed) { stateExecutionResult = new StateExecutionResult(StateExecutionStatus.Failed, new StateExecutionTransition(StateTypeConfiguration.Undefined, null)); await _workflowEngine.SaveWorkflowInstance(workflowInstance, cancellationToken).ConfigureAwait(false); return(stateExecutionResult); } stateExecutionResult = new StateExecutionResult(StateExecutionStatus.Failed, new StateExecutionTransition(StateTypeConfiguration.Failed, null)); await _workflowEngine.SaveWorkflowInstance(workflowInstance, cancellationToken).ConfigureAwait(false); return(stateExecutionResult); } finally { await InvokeListenerOnAfterExecutionState(stateExecutionContext, stateListener, stateExecutionResult, cancellationToken).ConfigureAwait(false); Log.Debug("Finished processing state [{type}::{code}], {status}, {nextState} [{workflowInstanceId}]", stateExecutionContext.StateConfiguration.Type, stateExecutionContext.StateConfiguration.Code, stateExecutionResult?.Status, stateExecutionResult?.Transition.TransitionConfiguration?.Code, stateExecutionContext.WorkflowContext.WorkflowInstance.Id); } }