alpha version

bus/events.go

@@ -0,0 +1,38 @@
+package bus
+
+import (
+	"fmt"
+)
+
+// Event is used to transport user data over bus.
+type Event struct {
+	ChannelName string
+	Payload     interface{}
+}
+
+// eventChannel stores subscriptions for channels.
+type eventChannel struct {
+	subscribers map[string]chan Event
+}
+
+// newEventChannel creates new eventChannel.
+func newEventChannel() *eventChannel {
+	return &eventChannel{
+		subscribers: make(map[string]chan Event),
+	}
+}
+
+// addSubscriber adds new subscriber.
+func (ch *eventChannel) addSubscriber(subName string, size int) error {
+	if _, ok := ch.subscribers[subName]; ok {
+		return fmt.Errorf("subscriber %s already exists", subName)
+	}
+	ch.subscribers[subName] = make(chan Event, size)
+
+	return nil
+}
+
+// delSubscriber removes subscriber.
+func (ch *eventChannel) delSubscriber(subName string) {
+	delete(ch.subscribers, subName)
+}