sched

type Task interface {
	// GetID must returns a unique ID for all of the scheduled task.
	GetID() (id string)
	// GetExecution returns the time for task execution.
	GetExecution() (execute time.Time)
	// GetRetryTime returns the retry time if a task was failed.
	GetRetryTime() (execute time.Time)
	// Execute executes the actual task, it can return a result,
	// or if the task need a retry, or it was failed in this execution.
	Execute() (result interface{}, retry bool, fail error)
}

type TaskFuture interface {
	Get() interface{}
}