waku/v2/api/history/emitters.go
package history
import "sync"
type Emitter[T any] struct {
sync.Mutex
subscriptions []chan T
}
func NewEmitter[T any]() *Emitter[T] {
return &Emitter[T]{}
}
func (s *Emitter[T]) Subscribe() <-chan T {
s.Lock()
defer s.Unlock()
c := make(chan T)
s.subscriptions = append(s.subscriptions, c)
return c
}
func (s *Emitter[T]) Emit(value T) {
s.Lock()
defer s.Unlock()
for _, sub := range s.subscriptions {
sub <- value
}
}
type OneShotEmitter[T any] struct {
Emitter[T]
}
func NewOneshotEmitter[T any]() *OneShotEmitter[T] {
return &OneShotEmitter[T]{}
}
func (s *OneShotEmitter[T]) Emit(value T) {
s.Lock()
defer s.Unlock()
for _, subs := range s.subscriptions {
subs <- value
close(subs)
}
s.subscriptions = nil
}