async Task RaiseCurrentStateLeaveEvents(BehaviorContext <TInstance> context, State <TInstance> fromState)
{
BehaviorContext <TInstance> leaveContext = context.GetProxy(fromState.Leave);
await fromState.Raise(leaveContext).ConfigureAwait(false);
State <TInstance> superState = fromState.SuperState;
while (superState != null && !superState.HasState(_toState))
{
BehaviorContext <TInstance> superStateLeaveContext = context.GetProxy(superState.Leave);
await superState.Raise(superStateLeaveContext).ConfigureAwait(false);
superState = superState.SuperState;
}
}
async Task Transition(BehaviorContext <TInstance> context)
{
State <TInstance> currentState = await _currentStateAccessor.Get(context).ConfigureAwait(false);
if (_toState.Equals(currentState))
{
return; // Homey don't play re-entry, at least not yet.
}
if (currentState != null && !currentState.HasState(_toState))
{
await RaiseCurrentStateLeaveEvents(context, currentState).ConfigureAwait(false);
}
await RaiseBeforeEnterEvents(context, currentState, _toState).ConfigureAwait(false);
await _currentStateAccessor.Set(context, _toState).ConfigureAwait(false);
if (currentState != null)
{
await RaiseAfterLeaveEvents(context, currentState, _toState).ConfigureAwait(false);
}
if (currentState == null || !_toState.HasState(currentState))
{
State <TInstance> superState = _toState.SuperState;
while (superState != null && (currentState == null || !superState.HasState(currentState)))
{
BehaviorContext <TInstance> superStateEnterContext = context.GetProxy(superState.Enter);
await superState.Raise(superStateEnterContext).ConfigureAwait(false);
superState = superState.SuperState;
}
BehaviorContext <TInstance> enterContext = context.GetProxy(_toState.Enter);
await _toState.Raise(enterContext).ConfigureAwait(false);
}
}
async Task RaiseBeforeEnterEvents(BehaviorContext <TInstance> context, State <TInstance> currentState, State <TInstance> toState)
{
State <TInstance> superState = toState.SuperState;
if (superState != null && (currentState == null || !superState.HasState(currentState)))
{
await RaiseBeforeEnterEvents(context, currentState, superState).ConfigureAwait(false);
}
if (currentState != null && toState.HasState(currentState))
{
return;
}
BehaviorContext <TInstance, State> beforeContext = context.GetProxy(toState.BeforeEnter, toState);
await toState.Raise(beforeContext).ConfigureAwait(false);
}
async Task RaiseAfterLeaveEvents(BehaviorContext <TInstance> context, State <TInstance> fromState, State <TInstance> toState)
{
if (fromState.HasState(toState))
{
return;
}
BehaviorContext <TInstance, State> afterContext = context.GetProxy(fromState.AfterLeave, fromState);
await fromState.Raise(afterContext).ConfigureAwait(false);
State <TInstance> superState = fromState.SuperState;
if (superState != null)
{
await RaiseAfterLeaveEvents(context, superState, toState).ConfigureAwait(false);
}
}
Task Behavior <TInstance> .Execute <T>(BehaviorContext <TInstance, T> context)
{
BehaviorContext <TInstance, TData> nextContext = context as BehaviorContext <TInstance, TData> ?? context.GetProxy(_event, _data);
return(_next.Execute(nextContext));
}
public BehaviorContext <TInstance> GetProxy(Event @event)
{
return(_context.GetProxy(@event));
}
Task Behavior <TInstance> .Execute(BehaviorContext <TInstance> context)
{
var nextContext = context.GetProxy(_event, _data);
return(_next.Execute(nextContext));
}