diff --git a/ceilometer/collector.py b/ceilometer/collector.py
index 2522a556d..9db3ad43b 100644
--- a/ceilometer/collector.py
+++ b/ceilometer/collector.py
@@ -80,9 +80,9 @@ class CollectorService(service.DispatchedService, rpc_service.Service):
                     sample['counter_unit'] = sample['unit']
                     sample['counter_type'] = sample['type']
                     LOG.debug("UDP: Storing %s", str(sample))
-                    self.dispatcher_manager.map(
-                        lambda ext, data: ext.obj.record_metering_data(data),
-                        sample)
+                    self.dispatcher_manager.map_method('record_metering_data',
+                                                       None,
+                                                       sample)
                 except Exception:
                     LOG.exception(_("UDP: Unable to store meter"))
 
@@ -106,19 +106,9 @@ class CollectorService(service.DispatchedService, rpc_service.Service):
         When the notification messages are re-published through the
         RPC publisher, this method receives them for processing.
         """
-        self.dispatcher_manager.map(self._record_metering_data_for_ext,
-                                    context=context,
-                                    data=data)
-
-    @staticmethod
-    def _record_metering_data_for_ext(ext, context, data):
-        """Wrapper for calling dispatcher plugin when a sample arrives
-
-        When a message is received by record_metering_data(), it calls
-        this method with each plugin to allow it to process the data.
-
-        """
-        ext.obj.record_metering_data(context, data)
+        self.dispatcher_manager.map_method('record_metering_data',
+                                           context=context,
+                                           data=data)
 
 
 def collector():
diff --git a/ceilometer/compute/nova_notifier.py b/ceilometer/compute/nova_notifier.py
index 64b1566fc..bb1946b3e 100644
--- a/ceilometer/compute/nova_notifier.py
+++ b/ceilometer/compute/nova_notifier.py
@@ -56,15 +56,12 @@ class DeletedInstanceStatsGatherer(object):
         self.mgr = extensions
         self.inspector = inspector.get_hypervisor_inspector()
 
-    def _get_samples_from_plugin(self, ext, cache, instance, *args, **kwds):
-        """Used with the extenaion manager map() method."""
-        return ext.obj.get_samples(self, cache, instance)
-
     def __call__(self, instance):
         cache = {}
-        samples = self.mgr.map(self._get_samples_from_plugin,
-                               cache=cache,
-                               instance=instance)
+        samples = self.mgr.map_method('get_samples',
+                                      self,
+                                      cache,
+                                      instance)
         # samples is a list of lists, so flatten it before returning
         # the results
         results = []
diff --git a/ceilometer/tests/test_collector.py b/ceilometer/tests/test_collector.py
index e10a9e42b..ebc37d790 100644
--- a/ceilometer/tests/test_collector.py
+++ b/ceilometer/tests/test_collector.py
@@ -64,6 +64,22 @@ class TestCollector(tests_base.BaseTestCase):
         udp_socket.bind.assert_called_once_with((conf.udp_address,
                                                  conf.udp_port))
 
+    def test_record_metering_data(self):
+        mock_dispatcher = mock.MagicMock()
+        self.srv.dispatcher_manager = test_manager.TestExtensionManager(
+            [extension.Extension('test',
+                                 None,
+                                 None,
+                                 mock_dispatcher
+                                 ),
+             ])
+
+        self.srv.record_metering_data(None, self.counter)
+
+        mock_dispatcher.record_metering_data.assert_called_once_with(
+            context=None,
+            data=self.counter)
+
     def test_udp_receive(self):
         mock_dispatcher = mock.MagicMock()
         self.srv.dispatcher_manager = test_manager.TestExtensionManager(
@@ -86,6 +102,7 @@ class TestCollector(tests_base.BaseTestCase):
         self._verify_udp_socket(udp_socket)
 
         mock_dispatcher.record_metering_data.assert_called_once_with(
+            None,
             self.counter)
 
     def test_udp_receive_storage_error(self):
@@ -112,6 +129,7 @@ class TestCollector(tests_base.BaseTestCase):
         self._verify_udp_socket(udp_socket)
 
         mock_dispatcher.record_metering_data.assert_called_once_with(
+            None,
             self.counter)
 
     @staticmethod
diff --git a/requirements.txt b/requirements.txt
index 15300dda9..a4d4ad16b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ eventlet>=0.13.0
 anyjson>=0.3.3
 Flask>=0.10,<1.0
 pecan>=0.2.0
-stevedore>=0.10
+stevedore>=0.12
 msgpack-python
 python-glanceclient>=0.9.0
 python-novaclient>=2.15.0