Actorify backends

mopidy/backends/base/current_playlist.py

@@ -10,6 +10,8 @@ class CurrentPlaylistController(object):
     :type backend: :class:`mopidy.backends.base.Backend`
     """
 
+    pykka_traversable = True
+
     def __init__(self, backend):
         self.backend = backend
         self._cp_tracks = []

mopidy/backends/base/library.py

@@ -10,6 +10,8 @@ class LibraryController(object):
     :type provider: instance of :class:`BaseLibraryProvider`
     """
 
+    pykka_traversable = True
+
     def __init__(self, backend, provider):
         self.backend = backend
         self.provider = provider

mopidy/backends/base/playback.py

@@ -15,6 +15,8 @@ class PlaybackController(object):
     # pylint: disable = R0902
     # Too many instance attributes
 
+    pykka_traversable = True
+
     #: Constant representing the paused state.
     PAUSED = u'paused'
 
@@ -461,6 +463,7 @@ class PlaybackController(object):
         For internal use only. Should be called by the backend directly after a
         track has started playing.
         """
+        return # TODO-PYKKA Send started_playing event to interested parties
         if self.current_track is not None:
             self.backend.core_queue.put({
                 'to': 'frontend',
@@ -476,6 +479,7 @@ class PlaybackController(object):
         is stopped playing, e.g. at the next, previous, and stop actions and at
         end-of-track.
         """
+        return # TODO-PYKKA Send stopped_playing event to interested parties
         if self.current_track is not None:
             self.backend.core_queue.put({
                 'to': 'frontend',

mopidy/backends/dummy/__init__.py

@@ -1,3 +1,5 @@
+from pykka.actor import ThreadingActor
+
 from mopidy.backends.base import (Backend, CurrentPlaylistController,
     PlaybackController, BasePlaybackProvider, LibraryController,
     BaseLibraryProvider, StoredPlaylistsController,
@@ -5,15 +7,7 @@ from mopidy.backends.base import (Backend, CurrentPlaylistController,
 from mopidy.models import Playlist
 
 
-class DummyQueue(object):
-    def __init__(self):
-        self.received_messages = []
-
-    def put(self, message):
-        self.received_messages.append(message)
-
-
-class DummyBackend(Backend):
+class DummyBackend(ThreadingActor, Backend):
     """
     A backend which implements the backend API in the simplest way possible.
     Used in tests of the frontends.
@@ -24,8 +18,6 @@ class DummyBackend(Backend):
     def __init__(self, *args, **kwargs):
         super(DummyBackend, self).__init__(*args, **kwargs)
 
-        self.core_queue = DummyQueue()
-
         self.current_playlist = CurrentPlaylistController(backend=self)
 
         library_provider = DummyLibraryProvider(backend=self)

mopidy/backends/local/__init__.py

@@ -4,6 +4,8 @@ import multiprocessing
 import os
 import shutil
 
+from pykka.actor import ThreadingActor
+
 from mopidy import settings
 from mopidy.backends.base import (Backend, CurrentPlaylistController,
     LibraryController, BaseLibraryProvider, PlaybackController,
@@ -16,7 +18,7 @@ from .translator import parse_m3u, parse_mpd_tag_cache
 
 logger = logging.getLogger(u'mopidy.backends.local')
 
-class LocalBackend(Backend):
+class LocalBackend(ThreadingActor, Backend):
     """
     A backend for playing music from a local music archive.
 

mopidy/backends/spotify/__init__.py

@@ -1,5 +1,7 @@
 import logging
 
+from pykka.actor import ThreadingActor
+
 from mopidy import settings
 from mopidy.backends.base import (Backend, CurrentPlaylistController,
     LibraryController, PlaybackController, StoredPlaylistsController)
@@ -8,7 +10,7 @@ logger = logging.getLogger('mopidy.backends.spotify')
 
 ENCODING = 'utf-8'
 
-class SpotifyBackend(Backend):
+class SpotifyBackend(ThreadingActor, Backend):
     """
     A backend for playing music from the `Spotify <http://www.spotify.com/>`_
     music streaming service. The backend uses the official `libspotify
@@ -59,6 +61,7 @@ class SpotifyBackend(Backend):
 
         self.uri_handlers = [u'spotify:', u'http://open.spotify.com/']
 
+        # TODO-PYKKA: Do setup after actor starts?
         self.spotify = self._connect()
 
     def _connect(self):

mopidy/core.py

@@ -57,8 +57,7 @@ def setup_mixer():
     return get_class(settings.MIXER).start_proxy()
 
 def setup_backend():
-    # TODO-PYKKA: Convert backend to one or more actors?
-    return get_class(settings.BACKENDS[0])()
+    return get_class(settings.BACKENDS[0]).start_proxy()
 
 def setup_frontends():
     frontends = []