private void AttachState(State state)
{
state.Entered += OnStateEntered;
state.Exited += OnStateExited;
foreach (State child in state.Substates)
AttachState(child);
}
public TimeoutEvent(int timeoutInMilliseconds, State state, Action<State> eventPoster)
{
this.timeoutPeriod = timeoutInMilliseconds;
this.eventPoster = eventPoster;
this.state = state;
this.state.Entered += OnStateEntered;
this.state.Exited += OnStateExited;
}
/// <summary>
/// By returning the current state of the fsm, we nullify this event because nobody responded.
/// </summary>
/// <param name="eventToProcess"></param>
/// <returns></returns>
public override State ProcessEvent(State originalState, EventInstance eventToProcess)
{
Transition transition = transitions.MatchTransition(eventToProcess);
if (transition != null)
return TraverseDown(new TransitionEvent(this, transition, eventToProcess));
return originalState;
}
public static State GetSubstatePath(this State s, State targetState)
{
foreach (State substate in s.Substates)
{
if (substate.ContainsState(targetState))
return substate;
}
return null;
}
public State(object id, State parent)
{
this.id = id;
this.parent = parent;
this.substates = new List<State>();
this.transitions = new TransitionDirector();
Entered += delegate { };
Exited += delegate { };
Traversing += delegate { };
}
private void OnStateEntered(object sender, EventArgs args)
{
if (finishState != null)
return;
StateWatcherAction watcher = sender as StateWatcherAction;
finishState = watcher.State;
Cancel();
// Notify of the completion
callback(finishState.Id);
}
public void Initialize(StateMachine sm)
{
stateMachine = sm;
stateMachine.Starting += delegate
{
Log("Starting state machine");
if (root == null)
{
root = stateMachine.RootNode;
root.VisitChildren(AttachToState);
}
};
stateMachine.EventPosted += (s, e) => Log("Event posted: {0}", e.Event.Event);
stateMachine.EventProcessed += (s, e) => Log("Event processed: {0}", e.Event.Event);
}
public void ProcessNextEvent(State currentState)
{
// Processing should not be re-entrant, on the same thread or otherwise
if (NotProcessing == Interlocked.CompareExchange(ref processingIndicator, Processing, NotProcessing))
{
EventInstance eventToProcess = events.Dequeue();
if (eventToProcess != null)
currentState = currentState.ProcessEvent(currentState, eventToProcess);
processingIndicator = NotProcessing;
if (currentState == null || currentState.Substates.Count() > 0)
throw new InvalidOperationException("Current state [" + currentState + "] is a superstate or null.");
EventProcessed(this, new StateEventPostedArgs(currentState, eventToProcess));
}
}
public override State Build(State parent)
{
RootState root = new RootState();
((StateBuilderContext)Context).SetRootState(root);
foreach (IStateBuilder substate in SubStates)
{
root.AddChildState(substate.Build(root));
}
foreach (Action<State> action in secondPassActions)
{
action(root);
}
this.VisitChildren(sb => sb.Build(root));
return root;
}
public CompositeStateWatcherAction(
StateMachine stateMachine,
IEnumerable<object> states,
Action<object> callback)
{
this.stateMachine = stateMachine;
this.stateActions = new List<StateWatcherAction>();
this.finishState = null;
this.callback = callback;
foreach (object stateId in states)
{
State state = stateMachine[stateId];
StateWatcherAction action = new StateWatcherAction(state);
action.Performed += OnStateEntered;
stateActions.Add(action);
}
}
public virtual State ProcessEvent(State originalState, EventInstance eventToProcess)
{
Transition transition = transitions.MatchTransition(eventToProcess);
if (transition != null)
{
var transitionEvent = new TransitionEvent(originalState, transition, eventToProcess);
// If originating from substate
if (!this.Equals(originalState))
return originalState.TraverseUp(transitionEvent);
else
{
Exit(transitionEvent);
return parent.TraverseUp(transitionEvent);
}
}
// Not handled, pass it up the chain
return parent.ProcessEvent(originalState, eventToProcess);
}
public virtual State Build(State parent)
{
// Build is called twice, first time around we build just the state
if (state == null)
{
state = CreateState(Id, parent);
foreach (IBaseStateBuilder substate in substates)
{
state.AddChildState(substate.Build(state));
}
}
else
{
foreach (Action<State> action in secondPassActions)
{
action(state);
}
}
return state;
}
public SingleStateEventInstance(State targetState, object eventTarget)
: base(eventTarget)
{
this.targetState = targetState;
}
public void AddChildState(State substate)
{
substates.Add(substate);
}
public HistoryState(State parent, HistoryFetchStrategy historyStrategy)
: base(new HistoryStateId(parent.Id), parent)
{
historyFetcher = historyStrategy;
Parent.Exited += OnParentExit;
}
public Transition(State sourceState, object eventTarget, State targetState)
{
this.sourceState = sourceState;
this.eventTarget = eventTarget;
this.targetState = targetState;
}
public State Build(State parent)
{
throw new InvalidOperationException("Not valid to Build from this context");
}
public void PostTimeout(State state, object transitionEvent)
{
stateMachine.PostEvent(new SingleStateEventInstance(state, transitionEvent));
}
public StateEventPostedArgs(State state, EventInstance eventPosted)
: base(state)
{
Event = eventPosted;
}
public StateWatcherAction(State state)
{
State = state;
enterAction = new EnterAction(State, Perform);
}
private void AttachToState(State state)
{
state.Entered += delegate { Log("Entered {0}", state); };
state.Exited += delegate { Log("Exited {0}", state); };
}
public EnterAction(State state, Action<TransitionReceipt> action)
{
this.state = state;
this.state.Entered += OnStateEntered;
this.Action = action;
}
public ExitAction(State state, Action<TransitionReceipt> action)
{
this.state = state;
this.state.Exited += OnStateExited;
this.Action = action;
}
public virtual State CreateState(object stateId, State parent)
{
if (parent == null)
throw new InvalidOperationException("Parent may not be null for state: " + stateId);
return new State(stateId, parent);
}
public void PostTimeout(State state)
{
stateMachine.PostEvent(new SingleStateEventInstance(state, TimerBuilder.TimeoutEvent));
}
public GuardedTransition(State sourceState, object eventTarget, State targetState, Func<bool> guard)
: base(sourceState, eventTarget, targetState)
{
this.guard = guard;
}
public State Build(State parent)
{
HistoryState state = new HistoryState(parent, historyStrategy);
return state;
}
public StateEventArgs(State state)
{
State = state;
}
public TransitionEvent(State sourceState, Transition transition, EventInstance eventInstance)
{
this.sourceState = sourceState;
this.transition = transition;
this.eventInstance = eventInstance;
}
protected virtual void OnParentExit(object sender, StateTransitionEventArgs args)
{
lastState = historyFetcher(this, args.TransitionEvent);
}
