fsm

type Action string

type Factory interface {
	Register(StateMachine)
	Get(string) (StateMachine, bool)
}

type SimpleState struct {
	// contains filtered or unexported fields
}

type State interface {
	SetContext(StateContext) // set the state context
	Context() StateContext
	Label() StateLabel // get the state label
}

type StateBuilder func() State

type StateContext interface {
	CurrentState() State // get the current state
	TransitionTo(State)  // transition to the next state
}

type StateLabel string

type StateMachine interface {
	Name() string                                              // get the state machine name
	AddTransition(from, to StateLabel, action Action) error    // add a transition
	HasTransition(from StateLabel, action Action) bool         // check if has transition from one state to another
	TransitionToNext(StateContext, Action) bool                // transition to the next state
	Check() error                                              // Check the completeness of States and Transitions.
	RegisterStateBuilder(label StateLabel, state StateBuilder) // register a state
}

type TransitionError struct {
	Action  Action
	Current StateLabel
}