Add broker package for message queue support. Include http and nats

broker/broker.go

@@ -0,0 +1,60 @@
+package broker
+
+import (
+	"code.google.com/p/go-uuid/uuid"
+)
+
+type Broker interface {
+	Address() string
+	Connect() error
+	Disconnect() error
+	Init() error
+	Publish(string, []byte) error
+	Subscribe(string, func(*Message)) (Subscriber, error)
+}
+
+type Message struct {
+	Id        string
+	Timestamp int64
+	Topic     string
+	Data      []byte
+}
+
+type Subscriber interface {
+	Topic() string
+	Unsubscribe() error
+}
+
+var (
+	Address       string
+	Id            string
+	DefaultBroker Broker
+)
+
+func Init() error {
+	if len(Id) == 0 {
+		Id = "broker-" + uuid.NewUUID().String()
+	}
+
+	if DefaultBroker == nil {
+		DefaultBroker = NewHttpBroker(Address)
+	}
+
+	return DefaultBroker.Init()
+}
+
+func Connect() error {
+	return DefaultBroker.Connect()
+}
+
+func Disconnect() error {
+	return DefaultBroker.Disconnect()
+}
+
+func Publish(topic string, data []byte) error {
+	return DefaultBroker.Publish(topic, data)
+}
+
+func Subscribe(topic string, function func(*Message)) (Subscriber, error) {
+	return DefaultBroker.Subscribe(topic, function)
+}