Use ActiveSupport::Callbacks for Channel subscription callbacks.

 * Rely on AS::Callbacks for callback handling.
 * Add before_subscribe, after_subscribe, before_unsubscribe and
   after_unsubscribe convenience methods
 * alias on_subscribe and on_unsubscribe to after_subscribe and
   after_unsubscribe, respectively.
 * Remove `subscribed` and `unsubscribed` from the callback chain:
   these methods are now executed as the subject of the callbacks.
 * Update portions of ActionCable to use the more specific
   callback names.

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/action_cable/channel/periodic_timers.rb b/lib/action_cable/channel/periodic_timers.rb
index 9bdcc87aa5..25fe8e5e54 100644
--- a/lib/action_cable/channel/periodic_timers.rb
+++ b/lib/action_cable/channel/periodic_timers.rb
@@ -7,8 +7,8 @@ module ActionCable
         class_attribute :periodic_timers, instance_reader: false
         self.periodic_timers = []
 
-        on_subscribe   :start_periodic_timers
-        on_unsubscribe :stop_periodic_timers
+        after_subscribe   :start_periodic_timers
+        after_unsubscribe :stop_periodic_timers
       end
 
       module ClassMethods
@@ -38,4 +38,4 @@ module ActionCable
         end
     end
   end
-end
\ No newline at end of file
+end