On Tuesday, January 15, 2013 4:39:50 AM UTC-8, Sascha Gottfried wrote:
>
> Hello group,
> I am looking for a way to build up and keep my domain model in memory
> during pyramid serves my application. This time I do not want to use a SQL
> database or ZODB as the persistence layer. I currently maintain an URL
> dispatch based pyramid app using ZODB - this is where my current pyramid
> experience is coming from.
>
> Now I want to use pyramid to build an application to visualize data loaded
> from large CSV files on local harddisk. I use traversal to map URLs to
> folders and files. During application startup I create a basic resource
> tree while using several plain python model classes. Typical application
> usage should enlarge the resource tree by lazy loading child objects as
> requested by users. Lazy loading takes several seconds. This should happen
> only one time for every "resource" in the resource tree. My intention is to
> keep the main application object(a.k.a resource tree) in memory during
> several requests. Parsing CSV files during every request is way to slow.
> This actually happens.
>
> As request by traversal based applications I do pass the root_factory to
> the Configurator. The pyramid glossary cleary notes: "The “root factory”
> of a Pyramid application is called on every request sent to the
> application.". This way the application restarts building the resource tree
> on every request.
>
> def main(global_config, **settings):
> root = settings['root']
> if root is None:
> raise ValueError('virginia requires a root')
>
> def get_root(environ):
> fs = Filesystem(os.path.abspath(os.path.normpath(root)))
> directory = Directory(fs, root)
> application = Application(directory)
> return application
>
> config = Configurator(root_factory=get_root, settings=settings)
>
>
> I already tried passing a singleton to the root_factory. I currently do
> not use any caching/sessioning like beaker.
> Any suggestions how to build up a resource tree at runtime that keeps
> alive during requests??? Thanks for your answers!
>
Create the root object *outside* of `get_root()` and simply have
`get_root()` return that object.
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