Extract periodic timers concern

lib/action_cable/channel.rb

 module ActionCable
   module Channel
+    autoload :Base, 'action_cable/channel/base'
     autoload :Callbacks, 'action_cable/channel/callbacks'
+    autoload :PeriodicTimers, 'action_cable/channel/periodic_timers'
     autoload :Streams, 'action_cable/channel/streams'
-    autoload :Base, 'action_cable/channel/base'
   end
 end

lib/action_cable/channel/base.rb

@@ -2,14 +2,12 @@ module ActionCable
   module Channel
     class Base
       include Callbacks
+      include PeriodicTimers
       include Streams
 
       on_subscribe   :connect
       on_unsubscribe :disconnect
 
-      on_subscribe   :start_periodic_timers
-      on_unsubscribe :stop_periodic_timers
-
       attr_reader :params, :connection
       delegate :logger, to: :connection
 
@@ -22,7 +20,6 @@ def matches?(identifier)
       def initialize(connection, channel_identifier, params = {})
         @connection = connection
         @channel_identifier = channel_identifier
-        @_active_periodic_timers = []
         @params = params
 
         perform_connection
@@ -115,19 +112,6 @@ def run_unsubscribe_callbacks
         end
 
 
-        def start_periodic_timers
-          self.class.periodic_timers.each do |callback, options|
-            @_active_periodic_timers << EventMachine::PeriodicTimer.new(options[:every]) do
-              worker_pool.async.run_periodic_timer(self, callback)
-            end
-          end
-        end
-
-        def stop_periodic_timers
-          @_active_periodic_timers.each { |timer| timer.cancel }
-        end
-
-
         def worker_pool
           connection.worker_pool
         end

lib/action_cable/channel/callbacks.rb

@@ -4,11 +4,10 @@ module Callbacks
       extend ActiveSupport::Concern
 
       included do
-        class_attribute :on_subscribe_callbacks, :on_unsubscribe_callbacks, :periodic_timers, :instance_reader => false
+        class_attribute :on_subscribe_callbacks, :on_unsubscribe_callbacks, :instance_reader => false
 
         self.on_subscribe_callbacks = []
         self.on_unsubscribe_callbacks = []
-        self.periodic_timers = []
       end
 
       module ClassMethods
@@ -19,10 +18,6 @@ def on_subscribe(*methods)
         def on_unsubscribe(*methods)
           self.on_unsubscribe_callbacks += methods
         end
-
-        def periodically(callback, every:)
-          self.periodic_timers += [ [ callback, every: every ] ]
-        end
       end
     end
   end

lib/action_cable/channel/periodic_timers.rb

+module ActionCable
+  module Channel
+    module PeriodicTimers
+      extend ActiveSupport::Concern
+      
+      included do
+        class_attribute :periodic_timers, instance_reader: false
+        self.periodic_timers = []
+
+        on_subscribe   :start_periodic_timers
+        on_unsubscribe :stop_periodic_timers
+      end
+
+      module ClassMethods
+        def periodically(callback, every:)
+          self.periodic_timers += [ [ callback, every: every ] ]
+        end
+      end
+
+      private
+        def active_periodic_timers
+          @active_periodic_timers ||= []
+        end
+
+        def start_periodic_timers
+          self.class.periodic_timers.each do |callback, options|
+            active_periodic_timers << EventMachine::PeriodicTimer.new(options[:every]) do
+              worker_pool.async.run_periodic_timer(self, callback)
+            end
+          end
+        end
+
+        def stop_periodic_timers
+          active_periodic_timers.each { |timer| timer.cancel }
+        end
+    end
+  end
+end
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