Update the broker interface

broker/options.go

@@ -0,0 +1,47 @@
+package broker
+
+type Options struct{}
+
+type PublishOptions struct{}
+
+type SubscribeOptions struct {
+	// AutoAck defaults to true
+	AutoAck bool
+	// NumHandlers defaults to 1
+	NumHandlers int
+}
+
+type Option func(*Options)
+
+type PublishOption func(*PublishOptions)
+
+type SubscribeOption func(*SubscribeOptions)
+
+// DisableAutoAck will disable auto acking of messages
+// after they have been handled.
+func DisableAutoAck() SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.AutoAck = false
+	}
+}
+
+// NumHandlers sets the number of concurrent handlers to create
+// for a subscriber.
+func NumHandlers(i int) SubscribeOption {
+	return func(o *SubscribeOptions) {
+		o.NumHandlers = i
+	}
+}
+
+func newSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
+	opt := SubscribeOptions{
+		AutoAck:     true,
+		NumHandlers: 1,
+	}
+
+	for _, o := range opts {
+		o(&opt)
+	}
+
+	return opt
+}