private async ValueTask <bool> CanExecuteAsync(WorkflowExecutionContext workflowExecutionContext, IActivityBlueprint activityBlueprint, bool resuming, CancellationToken cancellationToken)
{
using var scope = _serviceScopeFactory.CreateScope();
var activityExecutionContext = new ActivityExecutionContext(
scope.ServiceProvider,
workflowExecutionContext,
activityBlueprint,
workflowExecutionContext.Input,
resuming,
cancellationToken);
using var executionScope = AmbientActivityExecutionContext.EnterScope(activityExecutionContext);
var runtimeActivityInstance = await activityExecutionContext.ActivateActivityAsync(cancellationToken);
var activityType = runtimeActivityInstance.ActivityType;
var activity = await activityType.ActivateAsync(activityExecutionContext);
var canExecute = await activityType.CanExecuteAsync(activityExecutionContext, activity);
if (canExecute)
{
var canExecuteMessage = new ValidateWorkflowActivityExecution(activityExecutionContext, runtimeActivityInstance);
await _mediator.Publish(canExecuteMessage, cancellationToken);
canExecute = canExecuteMessage.CanExecuteActivity;
}
return(canExecute);
}
private async ValueTask RunCoreAsync(WorkflowExecutionContext workflowExecutionContext, ActivityOperation activityOperation, CancellationToken cancellationToken = default)
{
var scope = workflowExecutionContext.ServiceProvider;
var workflowBlueprint = workflowExecutionContext.WorkflowBlueprint;
var workflowInstance = workflowExecutionContext.WorkflowInstance;
var burstStarted = false;
while (workflowExecutionContext.HasScheduledActivities)
{
var scheduledActivity = workflowInstance.CurrentActivity = workflowExecutionContext.PopScheduledActivity();
var currentActivityId = scheduledActivity.ActivityId;
var activityBlueprint = workflowBlueprint.GetActivity(currentActivityId) !;
var resuming = activityOperation == Resume;
var outputReference = workflowInstance.Output;
var output = outputReference != null ? await _workflowStorageService.LoadAsync(outputReference.ProviderName, new WorkflowStorageContext(workflowInstance, outputReference.ActivityId), "Output", cancellationToken) : null;
var input = !burstStarted ? workflowExecutionContext.Input : scheduledActivity.Input ?? output;
var activityExecutionContext = new ActivityExecutionContext(scope, workflowExecutionContext, activityBlueprint, input, resuming, cancellationToken);
var runtimeActivityInstance = await activityExecutionContext.ActivateActivityAsync(cancellationToken);
var activityType = runtimeActivityInstance.ActivityType;
using var executionScope = AmbientActivityExecutionContext.EnterScope(activityExecutionContext);
var activity = await activityType.ActivateAsync(activityExecutionContext);
if (!burstStarted)
{
await _mediator.Publish(new WorkflowExecutionBurstStarting(workflowExecutionContext, activityExecutionContext), cancellationToken);
burstStarted = true;
}
if (resuming)
{
await _mediator.Publish(new ActivityResuming(activityExecutionContext, activity), cancellationToken);
}
await _mediator.Publish(new ActivityExecuting(activityExecutionContext, activity), cancellationToken);
var result = await TryExecuteActivityAsync(activityOperation, activityExecutionContext, activity, cancellationToken);
if (result == null)
{
return;
}
await _mediator.Publish(new ActivityExecuted(activityExecutionContext, activity), cancellationToken);
await _mediator.Publish(new ActivityExecutionResultExecuting(result, activityExecutionContext), cancellationToken);
await result.ExecuteAsync(activityExecutionContext, cancellationToken);
workflowExecutionContext.CompletePass();
workflowInstance.LastExecutedActivityId = currentActivityId;
await _mediator.Publish(new ActivityExecutionResultExecuted(result, activityExecutionContext), cancellationToken);
await _mediator.Publish(new WorkflowExecutionPassCompleted(workflowExecutionContext, activityExecutionContext), cancellationToken);
if (!workflowExecutionContext.HasScheduledActivities)
{
await _mediator.Publish(new WorkflowExecutionBurstCompleted(workflowExecutionContext, activityExecutionContext), cancellationToken);
}
activityOperation = Execute;
}
workflowInstance.CurrentActivity = null;
if (workflowExecutionContext.HasBlockingActivities)
{
workflowExecutionContext.Suspend();
}
if (workflowExecutionContext.Status == WorkflowStatus.Running)
{
await workflowExecutionContext.CompleteAsync();
}
}