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Rack middleware.
* This initial implementation is a bit hackish, but it uses a normal middleware API
so it's future-proof when we improve the internals.
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architecture is kind of messy. Next: CLEAN UP.
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* Move #set_cookie and #delete_cookie inline to optimize. These optimizations should
almost certainly be sent back upstream to Rack. The optimization involves using
an ivar for cookies instead of indexing into the headers each time.
* Was able to use a bare Hash for headers now that cookies have their own joining
semantics (some code assumed that the raw cookies were an Array).
* Cache blankness of body on body=
* Improve expand_cache_key for Arrays of a single element (common in our case)
* Use a simple layout condition check unless conditions are used
* Cache visible actions
* Lazily load the UrlRewriter
* Make etag an ivar that is set on prepare!
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flushing due to runtime Kernel#extend:
* The helper module adds a new _helper_serial property onto AbstractController subclasses
* When #helper is used to add helpers to a class, the serial number is updated
* An ActionView subclass is created and cached based on this serial number.
* That subclass includes the helper module from the controller
* Subsequent requests using the same controller with the same serial will result in
reusing that subclass, rather than being forced to take an action (like include
or extend) that will result in a global method cache flush on MRI and a flush
of the entire AV class' cache on JRuby.
* For now, this optimization is not applied to the RJS helpers, which results in
a global method cache flush in MRI and a flush of the JavaScriptGenerator class in
JRuby only when using RJS.
* Since the effects are limited to using RJS, and would only affect JavaScriptGenerator
in JRuby (as opposed to the entire view object), it seems worthwhile to apply this
now.
* This resulted in a significant performance improvement. I will have benchmarks
in the next day or two that show the performance impact of the last several
commits.
* There is a small chance this could break existing code (although I'm not sure how).
If that happens, please report it immediately.
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Consequences:
* It is not possible to always pre-determine the layout before going to ActionView.
This was *already* broken for render :partial => @object, :layout => true. This is
now handled by overriding render_to_body in layouts.rb and manually injecting the
partial's response. This needs to be done in ActionController since ActionController
knows enough to get _layout_for_option. There is probably a better abstraction here.
* As a result, all partial rendering can correctly restrict their layouts to the mime
type of the rendered partial. This could have previously caused a bug in some edge cases.
* If other layout-like options are added, they might need to add special code for the
case of render :partial. We should try to think of an alternate solution, if possible,
but this works for the cases we know of now.
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