1 files changed, 32 insertions, 0 deletions
diff --git a/go/observable.go b/go/observable.go
new file mode 100644
index 00000000..9a38802c
--- /dev/null
+++ b/go/observable.go
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) NGINX, Inc.
+ */
+
+package unit
+
+import (
+	"sync"
+)
+
+type observable struct {
+	sync.Mutex
+	observers []chan int
+}
+
+func (o *observable) attach(c chan int) {
+	o.Lock()
+	defer o.Unlock()
+
+	o.observers = append(o.observers, c)
+}
+
+func (o *observable) notify(e int) {
+	o.Lock()
+	defer o.Unlock()
+
+	for _, v := range o.observers {
+		v <- e
+	}
+
+	o.observers = nil
+}