Use Pykka proxies to send events

With Pykka >= 0.16, sending events can be done using proxies instead of
manually crafting Pykka's internal function call messages.

docs/changes.rst

@@ -8,7 +8,9 @@ This change log is used to track all major changes to Mopidy.
 v0.9.0 (in development)
 =======================
 
-- Nothing so far.
+**Dependencies**
+
+- Pykka >= 0.16 is now required.
 
 
 v0.8.0 (2012-09-20)

docs/installation/index.rst

@@ -26,7 +26,7 @@ dependencies installed.
 
   - Python >= 2.6, < 3
 
-  - Pykka >= 0.12.3::
+  - Pykka >= 0.16::
 
         sudo pip install -U pykka
 

mopidy/core/listener.py

@@ -1,4 +1,4 @@
-from pykka import registry
+from pykka.registry import ActorRegistry
 
 
 class CoreListener(object):
@@ -15,14 +15,9 @@ class CoreListener(object):
     @staticmethod
     def send(event, **kwargs):
         """Helper to allow calling of core listener events"""
-        # FIXME this should be updated once Pykka supports non-blocking calls
-        # on proxies or some similar solution.
-        registry.ActorRegistry.broadcast({
-            'command': 'pykka_call',
-            'attr_path': (event,),
-            'args': [],
-            'kwargs': kwargs,
-        }, target_class=CoreListener)
+        listeners = ActorRegistry.get_by_class(CoreListener)
+        for listener in listeners:
+            getattr(listener.proxy(), event)(**kwargs)
 
     def track_playback_paused(self, track, time_position):
         """
@@ -50,7 +45,6 @@ class CoreListener(object):
         """
         pass
 
-
     def track_playback_started(self, track):
         """
         Called whenever a new track starts playing.

requirements/core.txt

@@ -1 +1 @@
-Pykka >= 0.12.3
+Pykka >= 0.16