public void NoPredictionIfNotPossible()
{
// Arrange
var workplan = WorkplanDummy.CreateBig();
bool triggered = false;
var predictor = Workflow.PathPrediction(workplan);
predictor.PathPrediction += (sender, args) => triggered = triggered = true;
// Act
var engine = Workflow.CreateEngine(workplan, new NullContext());
engine.Completed += (sender, place) => { };
engine.TransitionTriggered += (sender, transition) => { };
predictor.Monitor(engine);
engine.Start();
// Assert
Assert.IsFalse(triggered, "Path predictor should not have been activiated");
}
public void PredictFailureBeforeCompletion()
{
// Arrange
var stopWatch = new Stopwatch();
var workplan = WorkplanDummy.CreateBig();
var predictor = Workflow.PathPrediction(workplan);
long predictionTime = long.MaxValue;
NodeClassification prediction = NodeClassification.Intermediate;
predictor.PathPrediction += (sender, args) =>
{
prediction = args.PredictedOutcome;
predictionTime = stopWatch.ElapsedMilliseconds;
};
var engine = Workflow.CreateEngine(workplan, new NullContext());
engine.ExecutedWorkflow.Transitions.OfType <DummyTransition>().ForEach(dt => dt.ResultOutput = -1); // Disable automatic execution
// Act
long completionTime = 0;
var finalResult = NodeClassification.Intermediate;
engine.Completed += (sender, place) => { completionTime = stopWatch.ElapsedMilliseconds; finalResult = place.Classification; };
engine.TransitionTriggered += (sender, transition) => ThreadPool.QueueUserWorkItem(ResumeAsync, transition);
predictor.Monitor(engine);
stopWatch.Start();
engine.Start();
// Assert
while (finalResult == NodeClassification.Intermediate)
{
Thread.Sleep(1); // Await completion
}
stopWatch.Stop();
Assert.Less(predictionTime, completionTime, "Engine was completed before a prediction was published.");
Assert.AreEqual(finalResult, prediction, "Predication was incorrect");
}
public void PublishPredictionAfterInterruption()
{
// Arrange
var workplan = WorkplanDummy.CreateBig();
var predictor = Workflow.PathPrediction(workplan);
NodeClassification prediction = NodeClassification.Intermediate;
predictor.PathPrediction += (sender, args) => prediction = args.PredictedOutcome;
// Start and pause engine in
var engine = Workflow.CreateEngine(workplan, new NullContext());
var transitions = engine.ExecutedWorkflow.Transitions.OfType <DummyTransition>();
transitions.ForEach(dt => dt.ResultOutput = -1); // Disable automatic execution
transitions.First().ResultOutput = 1; // Except for the first one
engine.TransitionTriggered += (sender, transition) => { };
engine.Start();
// Act
var snapshot = engine.Pause(); // Snapshot of the engine in a sure failure path
engine.Dispose();
engine = Workflow.CreateEngine(workplan, new NullContext());
engine.Restore(snapshot); // Restore new engine from the snapshot
var finalResult = NodeClassification.Intermediate;
engine.Completed += (sender, place) => finalResult = place.Classification;
engine.TransitionTriggered += (sender, transition) => ThreadPool.QueueUserWorkItem(ResumeAsync, transition);
predictor.Monitor(engine);
engine.Start(); // This should resume the engine in a failure path and directly raise the event
// Assert
while (finalResult == NodeClassification.Intermediate)
{
Thread.Sleep(1); // Await completion
}
Assert.AreEqual(finalResult, prediction, "Predication was incorrect");
}