intermediate: introduce an abstract channel

lib/channel/GwChannelInterface.h

@@ -0,0 +1,9 @@
+#pragma once
+#include "GwBuffer.h"
+class GwChannelInterface{
+    public:
+        virtual void loop(bool handleRead,bool handleWrite)=0;
+        virtual void readMessages(GwMessageFetcher *writer)=0;
+        virtual size_t sendToClients(const char *buffer, int sourceId, bool partial=false)=0;
+        virtual Stream * getStream(bool partialWrites){ return NULL;}
+};