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684 B · 43 lines
Go
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import ( "sync")
type Notifier struct { subscribers map[chan struct{}]struct{} mu sync.Mutex}
func New() Notifier { return Notifier{ subscribers: make(map[chan struct{}]struct{}), }}
func (n *Notifier) Subscribe() chan struct{} { ch := make(chan struct{}, 1) n.mu.Lock() n.subscribers[ch] = struct{}{} n.mu.Unlock() return ch}
func (n *Notifier) Unsubscribe(ch chan struct{}) { n.mu.Lock() delete(n.subscribers, ch) close(ch) n.mu.Unlock()}
func (n *Notifier) NotifyAll() { n.mu.Lock() for ch := range n.subscribers { select { case ch <- struct{}{}: default: // avoid blocking if channel is full } } n.mu.Unlock()}