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-rw-r--r--actionpack/lib/action_dispatch.rb1
-rw-r--r--actionpack/lib/action_dispatch/middleware/load_interlock.rb21
2 files changed, 22 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch.rb b/actionpack/lib/action_dispatch.rb
index dcd3ee0644..f6336c8c7a 100644
--- a/actionpack/lib/action_dispatch.rb
+++ b/actionpack/lib/action_dispatch.rb
@@ -52,6 +52,7 @@ module ActionDispatch
autoload :DebugExceptions
autoload :ExceptionWrapper
autoload :Flash
+ autoload :LoadInterlock
autoload :ParamsParser
autoload :PublicExceptions
autoload :Reloader
diff --git a/actionpack/lib/action_dispatch/middleware/load_interlock.rb b/actionpack/lib/action_dispatch/middleware/load_interlock.rb
new file mode 100644
index 0000000000..07f498319c
--- /dev/null
+++ b/actionpack/lib/action_dispatch/middleware/load_interlock.rb
@@ -0,0 +1,21 @@
+require 'active_support/dependencies'
+require 'rack/body_proxy'
+
+module ActionDispatch
+ class LoadInterlock
+ def initialize(app)
+ @app = app
+ end
+
+ def call(env)
+ interlock = ActiveSupport::Dependencies.interlock
+ interlock.start_running
+ response = @app.call(env)
+ body = Rack::BodyProxy.new(response[2]) { interlock.done_running }
+ response[2] = body
+ response
+ ensure
+ interlock.done_running unless body
+ end
+ end
+end