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package events
import (
"sync"
)
// HandlerImpl helps to broadcast events to multiple listeners.
type HandlerImpl struct {
listeners []Listener
sync.RWMutex // all receivers should be pointers
}
func NewEventsHandler() Handler {
return &HandlerImpl{listeners: make([]Listener, 0, 2)}
}
// NumListeners returns number of event listeners.
func (eb *HandlerImpl) NumListeners() int {
eb.Lock()
defer eb.Unlock()
return len(eb.listeners)
}
// AddListener registers new event listener.
func (eb *HandlerImpl) AddListener(listener Listener) {
eb.Lock()
defer eb.Unlock()
eb.listeners = append(eb.listeners, listener)
}
// Push broadcast events across all event listeners.
func (eb *HandlerImpl) Push(e interface{}) {
// ReadLock here because we are not changing listeners
eb.RLock()
defer eb.RUnlock()
for k := range eb.listeners {
eb.listeners[k](e)
}
}
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