cleanup interfaces for v4

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

server/server.go

@@ -48,10 +48,6 @@ type Server interface {
 	Handle(h Handler) error
 	// Create a new handler
 	NewHandler(h interface{}, opts ...HandlerOption) Handler
-	// Create a new subscriber
-	NewSubscriber(topic string, h interface{}, opts ...SubscriberOption) Subscriber
-	// Register a subscriber
-	Subscribe(s Subscriber) error
 	// Start the server
 	Start() error
 	// Stop the server
@@ -60,30 +56,6 @@ type Server interface {
 	String() string
 }
 
-/*
-// Router handle serving messages
-type Router interface {
-	// ProcessMessage processes a message
-	ProcessMessage(ctx context.Context, msg Message) error
-	// ServeRequest processes a request to completion
-	ServeRequest(ctx context.Context, req Request, rsp Response) error
-}
-*/
-
-// Message is an async message interface
-type Message interface {
-	// Topic of the message
-	Topic() string
-	// The decoded payload value
-	Body() interface{}
-	// The content type of the payload
-	ContentType() string
-	// The raw headers of the message
-	Header() metadata.Metadata
-	// Codec used to decode the message
-	Codec() codec.Codec
-}
-
 // Request is a synchronous request interface
 type Request interface {
 	// Service name requested
@@ -156,13 +128,3 @@ type Handler interface {
 	Endpoints() []*register.Endpoint
 	Options() HandlerOptions
 }
-
-// Subscriber interface represents a subscription to a given topic using
-// a specific subscriber function or object with endpoints. It mirrors
-// the handler in its behaviour.
-type Subscriber interface {
-	Topic() string
-	Subscriber() interface{}
-	Endpoints() []*register.Endpoint
-	Options() SubscriberOptions
-}