///// <summary>
///// RunStateMachine is the heart of the engine that runs the finite state machine. It is executed in a
///// separate thread that is started when you <see cref="Start(FiniteState)"/> the state machine.
///// All events that have been queued by <see cref="RaiseEvent(FiniteStateEvent)"/>, are processed here.
///// The method runs in an infinite loop that only exits when <see cref="Stop()"/> is called.
///// When it has processed all of the events in the queue, it will sleep until it is pulsed
///// by either <see cref="RaiseEvent(FiniteStateEvent)"/> or <see cref="Stop()"/>
///// </summary>
//public void RunStateMachine()
//{
// string methodName = System.Reflection.MethodBase.GetCurrentMethod().Name;
// if (log.IsDebugEnabled)
// log.Debug($"{methodName}: enter");
//
// try
// {
// while (!stopRequested)
// {
// HandlePendingEvents();
// if (!stopRequested)
// {
// lock (locker)
// {
// if (log.IsDebugEnabled)
// log.Debug($"{methodName}: Putting to sleep the state machine thread.");
//
// Monitor.Wait(locker); // Nothing to do, so go to sleep until we are pulsed by RaiseEvent or Stop
//
// if (log.IsDebugEnabled)
// log.Debug($"{methodName}: Just woke up :-)");
// }
// }
// }
// }
// catch(Exception e)
// {
// log.Error($"{e.Message}");
// //OnExceptionAction?.Invoke(e);
// }
// finally
// {
// if (log.IsDebugEnabled)
// log.Debug($"{methodName}: exit");
// }
//}
//
/// <summary>
/// This function is called during the first call to RaiseEvent() in Start() because at that point,
/// we are not handling a previous event. From then on, every event handler raises an event.
/// </summary>
public void HandlePendingEvents()
{
string methodName = System.Reflection.MethodBase.GetCurrentMethod().Name;
if (log.IsDebugEnabled)
{
log.Debug($"{methodName}: enter");
}
try
{
while (PendingEvents.Count > 0)
{
if (log.IsDebugEnabled)
{
log.Debug($"{methodName}: PendingEvents.Count={PendingEvents.Count}");
}
FiniteStateEvent ev = null;
lock (PendingEvents)
{
ev = PendingEvents.Dequeue();
}
if (CurrentState.Transitions.TryGetValue(ev.Name, out FiniteStateTransition transition))
{
if (log.IsDebugEnabled)
{
log.Debug($"{methodName}: transition {CurrentState.Name} -> {ev.Name} ->{transition.ToState.Name}");
}
SetCurrentState(transition.ToState);
if (log.IsDebugEnabled)
{
log.Debug($"{methodName}: before invoke, PendingEvents.Count={PendingEvents.Count}");
}
CurrentState.OnEnterAction?.Invoke();
if (log.IsDebugEnabled)
{
log.Debug($"{methodName}: after invoke, PendingEvents.Count={PendingEvents.Count}");
}
}
else
{
throw new ArgumentException($"Failed to find a transition for event '{ev.Name}' from state '{CurrentState.Name}'.");
}
}
}
finally
{
if (log.IsDebugEnabled)
{
log.Debug($"{methodName}: exit");
}
}
}
protected void Dequeue()
{
PendingEvents.Dequeue();
}
