Use ServiceBase from oslo.service as a parent class

Inherit MessageHandlingServer from ServiceBase.
Add the dummy "reset" method to the MessageHandlingServer.

Closes-Bug: #1470484
Change-Id: I4159450f54609c5185146472179d4299fe0c9d30

oslo_messaging/server.py

@@ -23,6 +23,7 @@ __all__ = [
     'ServerListenError',
 ]
 
+from oslo_service import service
 from stevedore import driver
 
 from oslo_messaging._drivers import base as driver_base
@@ -53,7 +54,7 @@ class ServerListenError(MessagingServerError):
         self.ex = ex
 
 
-class MessageHandlingServer(object):
+class MessageHandlingServer(service.ServiceBase):
     """Server for handling messages.
 
     Connect a transport to a dispatcher that knows how to process the
@@ -148,3 +149,11 @@ class MessageHandlingServer(object):
             self._executor.listener.cleanup()
 
         self._executor = None
+
+    def reset(self):
+        """Reset service.
+
+        Called in case service running in daemon mode receives SIGHUP.
+        """
+        # TODO(sergey.vilgelm): implement this method
+        pass

requirements.txt

@@ -8,6 +8,7 @@ oslo.config>=1.11.0 # Apache-2.0
 oslo.context>=0.2.0 # Apache-2.0
 oslo.utils>=1.6.0 # Apache-2.0
 oslo.serialization>=1.4.0 # Apache-2.0
+oslo.service>=0.1.0 # Apache-2.0
 oslo.i18n>=1.5.0 # Apache-2.0
 stevedore>=1.5.0 # Apache-2.0