| 1 | package event |
| 2 | |
| 3 | // FanOut dispatches each event to every registered sink in order. |
| 4 | // A nil sink in the list is silently skipped. Use it when you want one |
| 5 | // event stream to reach multiple consumers — e.g. the desktop tab UI and |
| 6 | // a bot-channel notifier. |
| 7 | type FanOut struct { |
| 8 | sinks []Sink |
| 9 | } |
| 10 | |
| 11 | // NewFanOut returns a FanOut that delivers every Emit call to every sink |
| 12 | // in the given order. A zero-length list is valid (no-op). |
| 13 | func NewFanOut(sinks ...Sink) *FanOut { |
| 14 | return &FanOut{sinks: sinks} |
| 15 | } |
| 16 | |
| 17 | // Emit forwards e to every registered sink. Nil sinks are skipped. |
| 18 | func (f *FanOut) Emit(e Event) { |
| 19 | for _, s := range f.sinks { |
| 20 | if s == nil { |
| 21 | continue |
| 22 | } |
| 23 | s.Emit(e) |
| 24 | } |
| 25 | } |
| 26 | |
| 27 | // Len returns the number of registered sinks. |
| 28 | func (f *FanOut) Len() int { return len(f.sinks) } |
| 29 |