Added WSF_RESPONSE_HANDLER based on WSF_RESPONSE_MESSAGE

The descendant has to implement the function

    response (ctx: C; req: WSF_REQUEST): WSF_RESPONSE_MESSAGE

Added related features and class in WSF_ROUTER to be able to use agent easily.

library/server/wsf/router/wsf_agent_response_handler.e

@@ -0,0 +1,43 @@
+note
+	description: "Summary description for WSF_AGENT_RESPONSE_HANDLER."
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	WSF_AGENT_RESPONSE_HANDLER [C -> WSF_HANDLER_CONTEXT]
+
+inherit
+	WSF_RESPONSE_HANDLER [C]
+
+create
+	make
+
+feature -- Initialization
+
+	make (act: like action)
+		do
+			action := act
+		end
+
+feature -- Access
+
+	action: FUNCTION [ANY, TUPLE [ctx: C; req: WSF_REQUEST], WSF_RESPONSE_MESSAGE]
+
+feature -- Execution
+
+	response (ctx: C; req: WSF_REQUEST): WSF_RESPONSE_MESSAGE
+		do
+			Result := action.item ([ctx, req])
+		end
+
+note
+	copyright: "2011-2012, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
+	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
+	source: "[
+			Eiffel Software
+			5949 Hollister Ave., Goleta, CA 93117 USA
+			Telephone 805-685-1006, Fax 805-685-6869
+			Website http://www.eiffel.com
+			Customer support http://support.eiffel.com
+		]"
+end