Marcus Malcom a écrit :
My use case is to make sure that a configuration file is only loaded
once per class loader space. I didn't see anything in the configuration
API that accomplishes this (please let me know if I missed something).
The call would look something like this:
cache.getConfiguration("someFile")
Naturally, this can be done with any Configuration, but I'm looking
mainly at the file configurations at the moment. The API would look
something like this:
Configuration getConfiguration(String fileName)
Configuration getConfiguration(URL url)
Configuration getConfiguration(File file)
Again, the point is that the cache object (singleton/multiton) would
cache the configuration file so that subsequent calls to
getConfiguration(...) would return the same object. I do have some
example code that I put together yesterday, should I send them to the
group?
I had a similar need on a project, I wrote a ConfigurationManager class
caching the configurations and performing an application specific lookup
to locate the configuration file. I'm not sure if such a singleton
should be introduced in the API though, such a caching looks a bit out
of scope to me. Developers will adopt very different approaches to this
issue depending on their architecture or personal taste (singleton,
dependency injection, existing cache API...) We can't really impose one
way of doing it. However this might be a good addition to our Wiki. We
already have a Spring example there.
http://wiki.apache.org/jakarta-commons/Configuration
Emmanuel Bourg
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