add filer notification

weed/msgqueue/message_queue.go

@@ -0,0 +1,11 @@
+package msgqueue
+
+import "github.com/golang/protobuf/proto"
+
+type MessageQueue interface {
+	// GetName gets the name to locate the configuration in message_queue.toml file
+	GetName() string
+	// Initialize initializes the file store
+	Initialize(configuration Configuration) error
+	SendMessage(key string, message proto.Message) error
+}