| Commit message (Collapse) | Author | Age | Files | Lines |
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[Harry Brundage & Xavier Noria]
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Possible thanks to Zeitwerk 1.3.0.
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Rails.autoloader and Rails.once_autoloader was just tentative API good
enough for a first patch. Rails.autoloader is singular and does not
convey in its name that there is another autoloader. That might be
confusing, for example if you set a logger and miss traces. On the other
hand, the name `once_autoloader` is very close to being horrible.
Rails.autoloaders.main and Rails.autoloaders.once read better for my
taste, and have a nice symmetry. Also, both "main" and "once" are four
letters long, short and same length.
They are tagged as "rails.main" and "rails.once", respectively.
References #35235.
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I believe the current style does not clearly communicate that we are
ignoring non-existing autoload paths altogether. Your eyes may even be
looking for an else clause that is easy to miss but that does not exist.
With the early `next` and code comment the loop reads better for my
taste.
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This basically reverts 8da30ad6be34339124ba4cb4e36aea260dda12bc
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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Only intended to be enabled when in use; by necessity, it sits above any
reasonable access control.
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These should allow external code to run blocks of user code to do
"work", at a similar unit size to a web request, without needing to get
intimate with ActionDipatch.
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Most importantly, the original request thread must yield its share lock
while waiting for the live thread to commit -- otherwise a request's
base and live threads can deadlock against each other.
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While we know no user code is running, we should do as much loading as
we can. That way, all the threads will then be able to resume running
user code together.
Otherwise, only the last arriving thread would get to do its load, and
would then return to userspace, leaving the others still blocked.
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Specifically, the "loose upgrades" behaviour that allows us to obtain an
exclusive right to load things while other requests are in progress (but
waiting on the exclusive lock for themselves) prevents us from treating
load & unload interchangeably: new things appearing is fine, but they do
*not* expect previously-present constants to vanish.
We can still use loose upgrades for unloading -- once someone has
decided to unload, they don't really care if someone else gets there
first -- it just needs to be tracked separately.
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We don't need to fully disable concurrent requests: just ensure that
loads are performed in isolation.
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Previously, ActiveSupport::Autoload was global and reserved
for usage inside Rails. This pull request makes it local,
fixes its test (they were not being run because its file
was named wrongly) and make it part of Rails public API.
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`ActiveSupport::Autoload#autoload` performance is improved in the default
case where a path is present. Since the full path name is not generated, it
isn't necessary to determine the full constant name either. This results in a
3x performance gain and reduces the number of Ruby objects generated. For a full
benchmark check [this gist](https://gist.github.com/2020228).
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should run during framework load do:
ActiveSupport.on_load(:action_controller) do
# Code run in the context of AC::Base
end
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add lazy_load_hooks.rb, which allows us to declare code that
should be run at some later time. For instance, this allows
us to defer requiring ActiveRecord::Base at boot time purely
to apply configuration. Instead, we register a hook that should
apply configuration once ActiveRecord::Base is loaded.
With these changes, brings down total boot time of a
new app to 300ms in production and 400ms in dev.
TODO: rename base_hook
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* A new module (ActiveSupport::Autoload) is provide that extends
autoloading with new behavior.
* All autoloads in modules that have extended ActiveSupport::Autoload
will be eagerly required in threadsafe environments
* Autoloads can optionally leave off the path if the path is the same
as full_constant_name.underscore
* It is possible to specify that a group of autoloads live under an
additional path. For instance, all of ActionDispatch's middlewares
are ActionDispatch::MiddlewareName, but they live under
"action_dispatch/middlewares/middleware_name"
* It is possible to specify that a group of autoloads are all found
at the same path. For instance, a number of exceptions might all
be declared there.
* One consequence of this is that testing-related constants are not
autoloaded. To get the testing helpers for a given component,
require "component_name/test_case". For instance, "action_controller/test_case".
* test_help.rb, which is automatically required by a Rails application's
test helper, requires the test_case.rb for all active components, so
this change will not be disruptive in existing or new applications.
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