Introduced WSF_ROUTER_SESSION

This fixes CQS violation from WSF_ROUTER.dispatch_and_return_handler (...): ? WSF_HANDLER
and related code, and this is more compliant with concurrency.

In addition, the WSF_ROUTER_SESSION can be enhanced in the future to answer more advanced needs.

library/server/wsf/router/wsf_router_session.e

@@ -0,0 +1,46 @@
+note
+	description: "[
+				This class represents the processing of a request via a WSF_ROUTER.
+				
+			]"
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	WSF_ROUTER_SESSION
+
+feature -- Status report	
+
+	dispatched: BOOLEAN
+			-- Handler dispatched?
+		do
+			Result := dispatched_handler /= Void
+		ensure
+			Result implies dispatched_handler /= Void
+		end
+
+feature -- Access
+
+	dispatched_handler: detachable WSF_HANDLER
+			-- Handler dispatched
+
+feature -- Change
+
+	set_dispatched_handler (h: like dispatched_handler)
+		do
+			dispatched_handler := h
+		ensure
+			h_set: dispatched_handler = h
+		end
+
+note
+	copyright: "2011-2013, Jocelyn Fiat, Javier Velilla, Olivier Ligot, 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