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package util
type EventsHandler interface {
NumListeners() int
AddListener(listener EventListener)
Push(e interface{})
}
// Event listener listens for the events produced by worker, worker pool or other service.
type EventListener func(event interface{})
// EventHandler helps to broadcast events to multiple listeners.
type EventHandler struct {
listeners []EventListener
}
func NewEventsHandler() EventsHandler {
return &EventHandler{listeners: make([]EventListener, 0, 2)}
}
// NumListeners returns number of event listeners.
func (eb *EventHandler) NumListeners() int {
return len(eb.listeners)
}
// AddListener registers new event listener.
func (eb *EventHandler) AddListener(listener EventListener) {
eb.listeners = append(eb.listeners, listener)
}
// Push broadcast events across all event listeners.
func (eb *EventHandler) Push(e interface{}) {
for _, listener := range eb.listeners {
listener(e)
}
}
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