plan

type StepGroup struct {
	Steps      []*flow.Step
	Parents    []*StepGroup
	TaskGroups []*TaskGroup
	sync.Mutex
	// contains filtered or unexported fields
}

type TaskGroup struct {
	Id              int
	Tasks           []*flow.Task
	Parents         []*TaskGroup
	ParentStepGroup *StepGroup
	RequestId       uint32 // id for actual request when running
	WaitAt          time.Time
	StartAt         time.Time
	StopAt          time.Time
	Error           error
}