static ActivityDefinitionService()
{
var workflowDefinition = new WorkflowDefinition
{
Name = "流程1"
};
var definition2 = new ActivityDefinition
{
Name = "Task2",
Start = false,
// State = null,
WorkflowDefinition = workflowDefinition
};
var definition = new ActivityDefinition
{
Name = "Task1",
Start = true,
// State = null,
WorkflowDefinition = workflowDefinition
};
workflowDefinition.Activitys = new[] { definition, definition2 };
workflowDefinition.Transitions = new List<TransitionDefinition>
{
new TransitionDefinition
{
SourceActivity = definition,
DestinationActivity = definition2,
WorkflowDefinition = workflowDefinition
}
};
WorkflowDefinitions.Add(workflowDefinition);
}
private void StartWorkflow(WorkflowContext workflowContext, ActivityDefinition activityDefinition, IDictionary<string, object> environment)
{
var cancellationToken = new CancellationToken();
InvokeActivities(activity => activity.OnWorkflowStarting(workflowContext, cancellationToken));
if (cancellationToken.IsCancelled)
return;
InvokeActivities(activity => activity.OnWorkflowStarted(workflowContext));
var blockedOn = ExecuteWorkflow(workflowContext, activityDefinition, environment).ToList();
if (blockedOn.Any())
{
foreach (var blocking in blockedOn)
{
workflowContext.WorkflowInstance.AwaitingActivities.Add(new AwaitingActivityDefinition
{
ActivityDefinition = blocking,
WorkflowInstance = workflowContext.WorkflowInstance
});
}
}
}
public IEnumerable<ActivityDefinition> ExecuteWorkflow(WorkflowContext workflowContext,
ActivityDefinition activityDefinition, IDictionary<string, object> environment)
{
var scheduled = new Stack<ActivityDefinition>();
scheduled.Push(activityDefinition);
while (scheduled.Any())
{
activityDefinition = scheduled.Pop();
var activityContext = CreateActivityContext(activityDefinition, environment);
var cancellationToken = new CancellationToken();
InvokeActivities(activity => activity.OnActivityExecuting(workflowContext, activityContext, cancellationToken));
if (cancellationToken.IsCancelled)
continue;
var outcomes = activityContext.Activity.Execute(workflowContext, activityContext).ToList();
InvokeActivities(activity => activity.OnActivityExecuted(workflowContext, activityContext));
foreach (var outcome in outcomes)
{
var transition = workflowContext.WorkflowInstance.WorkflowDefinition.Transitions.FirstOrDefault(x => x.SourceActivity == activityDefinition && x.DestinationActivity.Name == outcome);
if (transition != null)
{
scheduled.Push(transition.DestinationActivity);
}
}
}
return new ActivityDefinition[0];
}
private ActivityContext CreateActivityContext(ActivityDefinition activityDefinition, IDictionary<string, object> environment)
{
return new ActivityContext
{
Activity = _activitiesManager.GetActivityByName(activityDefinition.Name),
Environment = environment
};
}
