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The instrumentation proxy adds three stack frames per-middleware, even when nothing is listening. This commit, when the middleware stack is built, only adds instrumentation when the `process_middleware.action_dispatch` event has already been subscribed to. The advantage to this is that we don't have any extra stack frames in apps which don't need middleware instrumentation. The disadvantage is that the subscriptions need to be in place when the middleware stack is built (during app boot). I think this is likely okay because temporary AS::Notifications subscriptions are strongly discouraged. |
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| test | ||
| actionpack.gemspec | ||
| CHANGELOG.md | ||
| MIT-LICENSE | ||
| Rakefile | ||
| README.rdoc | ||
= Action Pack -- From request to response
Action Pack is a framework for handling and responding to web requests. It
provides mechanisms for *routing* (mapping request URLs to actions), defining
*controllers* that implement actions, and generating responses by rendering
*views*, which are templates of various formats. In short, Action Pack
provides the view and controller layers in the MVC paradigm.
It consists of several modules:
* Action Dispatch, which parses information about the web request, handles
routing as defined by the user, and does advanced processing related to HTTP
such as MIME-type negotiation, decoding parameters in POST, PATCH, or PUT bodies,
handling HTTP caching logic, cookies and sessions.
* Action Controller, which provides a base controller class that can be
subclassed to implement filters and actions to handle requests. The result
of an action is typically content generated from views.
With the Ruby on Rails framework, users only directly interface with the
Action Controller module. Necessary Action Dispatch functionality is activated
by default and Action View rendering is implicitly triggered by Action
Controller. However, these modules are designed to function on their own and
can be used outside of Rails.
You can read more about Action Pack in the {Action Controller Overview}[https://guides.rubyonrails.org/action_controller_overview.html] guide.
== Download and installation
The latest version of Action Pack can be installed with RubyGems:
$ gem install actionpack
Source code can be downloaded as part of the Rails project on GitHub:
* https://github.com/rails/rails/tree/master/actionpack
== License
Action Pack is released under the MIT license:
* https://opensource.org/licenses/MIT
== Support
API documentation is at:
* https://api.rubyonrails.org
Bug reports for the Ruby on Rails project can be filed here:
* https://github.com/rails/rails/issues
Feature requests should be discussed on the rails-core mailing list here:
* https://groups.google.com/forum/?fromgroups#!forum/rubyonrails-core