#2388: Implement lazy loading of template engine plug-ins
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Reporter: Chris Arndt | Owner: Chris Arndt
Type: enhancement | Status: new
Priority: normal | Milestone: 1.5
Component: View | Version: 1.1 HEAD
Severity: minor | Resolution:
Keywords: view, buffet, temlate engine |
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Old description:
> Currently Buffet template engines are loaded in `view.load_engines()`
> when the TurboGears server starts up. This means that all template engine
> plugins, which are registered through an entry point are loaded and
> instantiated, whether they are used by the application or not.
>
> We should investigate if it's feasible to instantiate a template plugin
> only when it is first need. `view.load_engines` would then only collect a
> list of available plugins and set some default engine options.
> Instantiating the plugin and loading options would then only be triggered
> from `view.render`.
>
> This would prevent bad plugins, which are installed but used in the
> application, from causing it too fail on startup. Exceptions in the
> startup phase currently cause TG/CherryPy to hang when the autoreloader
> is active.
>
> I may also speed up start-up time a bit.
New description:
Currently Buffet template engines are loaded in `view.load_engines()` when
the TurboGears server starts up. This means that all template engine
plugins, which are registered through an entry point are loaded and
instantiated, whether they are used by the application or not.
We should investigate if it's feasible to instantiate a template plugin
only when it is first needed. `view.load_engines` would then only collect
a list of available plugins and set some default engine options.
Instantiating the plugin and loading options would then only be triggered
from `view.render`.
This would prevent bad plugins, which are installed but not used in the
application, from causing it too fail on startup. Exceptions in the
startup phase currently cause TG/CherryPy to hang when the autoreloader is
active.
I may also speed up start-up time a bit.
--
Ticket URL: <http://trac.turbogears.org/ticket/2388#comment:1>
TurboGears <http://www.turbogears.org/>
TurboGears front-to-back web development
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