1 files changed, 26 insertions, 0 deletions
diff --git a/lib/action_cable/connection/identification.rb b/lib/action_cable/connection/identification.rb
new file mode 100644
index 0000000000..246636198b
--- /dev/null
+++ b/lib/action_cable/connection/identification.rb
@@ -0,0 +1,26 @@
+module ActionCable
+  module Connection
+    module Identification
+      extend ActiveSupport::Concern
+
+      included do
+        class_attribute :identifiers
+        self.identifiers = Set.new
+      end
+
+      class_methods do
+        def identified_by(*identifiers)
+          self.identifiers += identifiers
+        end
+      end
+
+      def connection_identifier
+        @connection_identifier ||= connection_gid identifiers.map { |id| instance_variable_get("@#{id}") }.compact
+      end
+
+      def connection_gid(ids)
+        ids.map { |o| o.to_global_id.to_s }.sort.join(":")
+      end
+    end
+  end
+end