Chore: make the code more semantic

common/observable/subscriber.go

@@ -0,0 +1,35 @@
+package observable
+
+import (
+	"sync"
+
+	"gopkg.in/eapache/channels.v1"
+)
+
+type Subscription <-chan interface{}
+
+type Subscriber struct {
+	buffer *channels.InfiniteChannel
+	once   sync.Once
+}
+
+func (s *Subscriber) Emit(item interface{}) {
+	s.buffer.In() <- item
+}
+
+func (s *Subscriber) Out() Subscription {
+	return s.buffer.Out()
+}
+
+func (s *Subscriber) Close() {
+	s.once.Do(func() {
+		s.buffer.Close()
+	})
+}
+
+func newSubscriber() *Subscriber {
+	sub := &Subscriber{
+		buffer: channels.NewInfiniteChannel(),
+	}
+	return sub
+}