diff --git a/ryu/app/rest_topology.py b/ryu/app/rest_topology.py
index 82a17557..5eed243d 100644
--- a/ryu/app/rest_topology.py
+++ b/ryu/app/rest_topology.py
@@ -16,10 +16,9 @@
 import json
 from webob import Response
 
-from ryu.app.wsgi import ControllerBase, WSGIApplication
+from ryu.app.wsgi import ControllerBase, WSGIApplication, route
 from ryu.base import app_manager
 from ryu.lib import dpid as dpid_lib
-from ryu.lib import port_no as port_no_lib
 from ryu.topology.api import get_switch, get_link
 
 # REST API for switch configuration
@@ -40,28 +39,6 @@ from ryu.topology.api import get_switch, get_link
 # <dpid>: datapath id in 16 hex
 
 
-class TopologyController(ControllerBase):
-    def __init__(self, req, link, data, **config):
-        super(TopologyController, self).__init__(req, link, data, **config)
-        self.topology_api_app = data['topology_api_app']
-
-    def list_switches(self, req, **kwargs):
-        dpid = None
-        if 'dpid' in kwargs:
-            dpid = dpid_lib.str_to_dpid(kwargs['dpid'])
-        switches = get_switch(self.topology_api_app, dpid)
-        body = json.dumps([switch.to_dict() for switch in switches])
-        return Response(content_type='application/json', body=body)
-
-    def list_links(self, req, **kwargs):
-        dpid = None
-        if 'dpid' in kwargs:
-            dpid = dpid_lib.str_to_dpid(kwargs['dpid'])
-        links = get_link(self.topology_api_app, dpid)
-        body = json.dumps([link.to_dict() for link in links])
-        return Response(content_type='application/json', body=body)
-
-
 class TopologyAPI(app_manager.RyuApp):
     _CONTEXTS = {
         'wsgi': WSGIApplication
@@ -69,31 +46,48 @@ class TopologyAPI(app_manager.RyuApp):
 
     def __init__(self, *args, **kwargs):
         super(TopologyAPI, self).__init__(*args, **kwargs)
+
         wsgi = kwargs['wsgi']
-        mapper = wsgi.mapper
+        wsgi.register(TopologyController, {'topology_api_app': self})
 
-        controller = TopologyController
-        wsgi.registory[controller.__name__] = {'topology_api_app': self}
-        route_name = 'topology'
 
-        uri = '/v1.0/topology/switches'
-        mapper.connect(route_name, uri, controller=controller,
-                       action='list_switches',
-                       conditions=dict(method=['GET']))
+class TopologyController(ControllerBase):
+    def __init__(self, req, link, data, **config):
+        super(TopologyController, self).__init__(req, link, data, **config)
+        self.topology_api_app = data['topology_api_app']
 
-        uri = '/v1.0/topology/switches/{dpid}'
-        requirements = {'dpid': dpid_lib.DPID_PATTERN}
-        s = mapper.submapper(controller=controller, requirements=requirements)
-        s.connect(route_name, uri, action='list_switches',
-                  conditions=dict(method=['GET']))
+    @route('topology', '/v1.0/topology/switches',
+           methods=['GET'])
+    def list_switches(self, req, **kwargs):
+        return self._switches(req, **kwargs)
 
-        uri = '/v1.0/topology/links'
-        mapper.connect(route_name, uri, controller=controller,
-                       action='list_links',
-                       conditions=dict(method=['GET']))
+    @route('topology', '/v1.0/topology/switches/{dpid}',
+           methods=['GET'], requirements={'dpid': dpid_lib.DPID_PATTERN})
+    def get_switch(self, req, **kwargs):
+        return self._switches(req, **kwargs)
 
-        uri = '/v1.0/topology/links/{dpid}'
-        requirements = {'dpid': dpid_lib.DPID_PATTERN}
-        s = mapper.submapper(controller=controller, requirements=requirements)
-        s.connect(route_name, uri, action='list_links',
-                  conditions=dict(method=['GET']))
+    @route('topology', '/v1.0/topology/links',
+           methods=['GET'])
+    def list_links(self, req, **kwargs):
+        return self._links(req, **kwargs)
+
+    @route('topology', '/v1.0/topology/links/{dpid}',
+           methods=['GET'], requirements={'dpid': dpid_lib.DPID_PATTERN})
+    def get_links(self, req, **kwargs):
+        return self._links(req, **kwargs)
+
+    def _switches(self, req, **kwargs):
+        dpid = None
+        if 'dpid' in kwargs:
+            dpid = dpid_lib.str_to_dpid(kwargs['dpid'])
+        switches = get_switch(self.topology_api_app, dpid)
+        body = json.dumps([switch.to_dict() for switch in switches])
+        return Response(content_type='application/json', body=body)
+
+    def _links(self, req, **kwargs):
+        dpid = None
+        if 'dpid' in kwargs:
+            dpid = dpid_lib.str_to_dpid(kwargs['dpid'])
+        links = get_link(self.topology_api_app, dpid)
+        body = json.dumps([link.to_dict() for link in links])
+        return Response(content_type='application/json', body=body)