1 files changed, 71 insertions, 0 deletions
diff --git a/actioncable/lib/action_cable/server/worker.rb b/actioncable/lib/action_cable/server/worker.rb
new file mode 100644
index 0000000000..b920b880db
--- /dev/null
+++ b/actioncable/lib/action_cable/server/worker.rb
@@ -0,0 +1,71 @@
+require 'active_support/callbacks'
+require 'active_support/core_ext/module/attribute_accessors_per_thread'
+require 'concurrent'
+
+module ActionCable
+  module Server
+    # Worker used by Server.send_async to do connection work in threads.
+    class Worker # :nodoc:
+      include ActiveSupport::Callbacks
+
+      thread_mattr_accessor :connection
+      define_callbacks :work
+      include ActiveRecordConnectionManagement
+
+      def initialize(max_size: 5)
+        @pool = Concurrent::ThreadPoolExecutor.new(
+          min_threads: 1,
+          max_threads: max_size,
+          max_queue: 0,
+        )
+      end
+
+      def async_invoke(receiver, method, *args)
+        @pool.post do
+          invoke(receiver, method, *args)
+        end
+      end
+
+      def invoke(receiver, method, *args)
+        begin
+          self.connection = receiver
+
+          run_callbacks :work do
+            receiver.send method, *args
+          end
+        rescue Exception => e
+          logger.error "There was an exception - #{e.class}(#{e.message})"
+          logger.error e.backtrace.join("\n")
+
+          receiver.handle_exception if receiver.respond_to?(:handle_exception)
+        ensure
+          self.connection = nil
+        end
+      end
+
+      def async_run_periodic_timer(channel, callback)
+        @pool.post do
+          run_periodic_timer(channel, callback)
+        end
+      end
+
+      def run_periodic_timer(channel, callback)
+        begin
+          self.connection = channel.connection
+
+          run_callbacks :work do
+            callback.respond_to?(:call) ? channel.instance_exec(&callback) : channel.send(callback)
+          end
+        ensure
+          self.connection = nil
+        end
+      end
+
+      private
+
+        def logger
+          ActionCable.server.logger
+        end
+    end
+  end
+end