Revert "Eliminate the EventMachine dependency"

2 files changed, 5 insertions, 7 deletions

diff --git a/actioncable/lib/action_cable/server/base.rb b/actioncable/lib/action_cable/server/base.rb
index b00abd208c..3385a4c9f3 100644
--- a/actioncable/lib/action_cable/server/base.rb
+++ b/actioncable/lib/action_cable/server/base.rb
@@ -32,10 +32,6 @@ module ActionCable
         @remote_connections ||= RemoteConnections.new(self)
       end
 
-      def stream_event_loop
-        @stream_event_loop ||= ActionCable::Connection::StreamEventLoop.new
-      end
-
       # The thread worker pool for handling all the connection work on this server. Default size is set by config.worker_pool_size.
       def worker_pool
         @worker_pool ||= ActionCable::Server::Worker.new(max_size: config.worker_pool_size)
diff --git a/actioncable/lib/action_cable/server/connections.rb b/actioncable/lib/action_cable/server/connections.rb
index 8671dd5ebd..47dcea8c20 100644
--- a/actioncable/lib/action_cable/server/connections.rb
+++ b/actioncable/lib/action_cable/server/connections.rb
@@ -22,9 +22,11 @@ module ActionCable
       # then can't rely on being able to receive and send to it. So there's a 3 second heartbeat running on all connections. If the beat fails, we automatically
       # disconnect.
       def setup_heartbeat_timer
-        @heartbeat_timer ||= Concurrent::TimerTask.new(execution_interval: BEAT_INTERVAL) do
-          Concurrent.global_io_executor.post { connections.map(&:beat) }
-        end.tap(&:execute)
+        EM.next_tick do
+          @heartbeat_timer ||= EventMachine.add_periodic_timer(BEAT_INTERVAL) do
+            EM.next_tick { connections.map(&:beat) }
+          end
+        end
       end
 
       def open_connections_statistics