hook

type Agent interface {
	// Trigger hooks
	Trigger(evt *Event) error
	// Serves events now
	Serve() error
	// Attach a job life cycle controller
	Attach(ctl lcm.Controller)
}

type Client interface {
	// SendEvent send the event to the subscribed parties
	SendEvent(evt *Event) error
}

type Event struct {
	URL       string            `json:"url"`
	Message   string            `json:"message"`   // meaningful text for event
	Data      *job.StatusChange `json:"data"`      // generic data
	Timestamp int64             `json:"timestamp"` // Use as time threshold of discarding the event (unit: second)
}