async Task InternalFireOneAsync(TTrigger trigger, params object[] args)
{
TriggerWithParameters configuration;
if (_triggerConfiguration.TryGetValue(trigger, out configuration))
{
configuration.ValidateParameters(args);
}
var source = State;
var representativeState = GetRepresentation(source);
TriggerBehaviourResult result;
if (!representativeState.TryFindHandler(trigger, args, out result))
{
await _unhandledTriggerAction.ExecuteAsync(representativeState.UnderlyingState, trigger, result?.UnmetGuardConditions).ConfigureAwait(false);
return;
}
TState destination;
if (result.Handler.ResultsInTransitionFrom(source, args, out destination))
{
var transition = new Transition(source, destination, trigger);
transition = await representativeState.ExitAsync(transition).ConfigureAwait(false);
State = transition.Destination;
var newRepresentation = GetRepresentation(transition.Destination);
await _onTransitionedEvent.InvokeAsync(transition).ConfigureAwait(false);
await newRepresentation.EnterAsync(transition, args).ConfigureAwait(false);
}
else
{
var transition = new Transition(source, destination, trigger);
await CurrentRepresentation.InternalActionAsync(transition, args).ConfigureAwait(false);
}
}
/// <summary>
/// The currently-permissible trigger values.
/// </summary>
public IEnumerable <TTrigger> GetPermittedTriggers(params object[] args)
{
return(CurrentRepresentation.GetPermittedTriggers(args));
}
async Task InternalFireOneAsync(TTrigger trigger, params object[] args)
{
// If this is a trigger with parameters, we must validate the parameter(s)
if (_triggerConfiguration.TryGetValue(trigger, out var configuration))
{
configuration.ValidateParameters(args);
}
var source = State;
var representativeState = GetRepresentation(source);
// Try to find a trigger handler, either in the current state or a super state.
if (!representativeState.TryFindHandler(trigger, args, out var result))
{
await _unhandledTriggerAction.ExecuteAsync(representativeState.UnderlyingState, trigger, result?.UnmetGuardConditions).ConfigureAwait(false);
return;
}
// Check if this trigger should be ignored
if (result.Handler is IgnoredTriggerBehaviour)
{
return;
}
// Handle special case, re-entry in superstate
if (result.Handler is ReentryTriggerBehaviour handler)
{
// Handle transition, and set new state
var transition = new Transition(source, handler.Destination, trigger);
transition = await representativeState.ExitAsync(transition);
State = transition.Destination;
var newRepresentation = GetRepresentation(transition.Destination);
if (!source.Equals(transition.Destination))
{
// Then Exit the final superstate
transition = new Transition(handler.Destination, handler.Destination, trigger);
await newRepresentation.ExitAsync(transition);
}
await _onTransitionedEvent.InvokeAsync(new Transition(source, handler.Destination, trigger));
await newRepresentation.EnterAsync(transition, args);
}
// Check if it is an internal transition, or a transition from one state to another.
else if (result.Handler.ResultsInTransitionFrom(source, args, out var destination))
{
var transition = new Transition(source, destination, trigger);
transition = await representativeState.ExitAsync(transition).ConfigureAwait(false);
State = transition.Destination;
var newRepresentation = GetRepresentation(transition.Destination);
// Check if there is an intital transition configured
if (newRepresentation.HasInitialTransition)
{
// Verify that the target state is a substate
if (!newRepresentation.GetSubstates().Any(s => s.UnderlyingState.Equals(newRepresentation.InitialTransitionTarget)))
{
throw new InvalidOperationException($"The target ({newRepresentation.InitialTransitionTarget}) for the initial transition is not a substate.");
}
// Check if state has substate(s), and if an initial transition(s) has been set up.
while (newRepresentation.GetSubstates().Any() && newRepresentation.HasInitialTransition)
{
var initialTransition = new Transition(source, newRepresentation.InitialTransitionTarget, trigger);
newRepresentation = GetRepresentation(newRepresentation.InitialTransitionTarget);
await newRepresentation.EnterAsync(initialTransition, args);
State = newRepresentation.UnderlyingState;
}
//Alert all listeners of state transition
await _onTransitionedEvent.InvokeAsync(new Transition(source, destination, trigger));
}
else
{
//Alert all listeners of state transition
await _onTransitionedEvent.InvokeAsync(new Transition(source, destination, trigger));
await newRepresentation.EnterAsync(transition, args);
}
}
else
{
var transition = new Transition(source, destination, trigger);
await CurrentRepresentation.InternalActionAsync(transition, args).ConfigureAwait(false);
}
}
