[Bioc-devel] BiocFileCache for developers

[Shepherd, Lori]

If you are using it as a helper function that may be too much exposure and you may just want it running behind the scenes in default location;  but it could be given as an option to the user. I guess a coding preference. If the user specified directory is used, they will have to remember to input that each time they use your package or it will redownload.


There shouldn't be a concern of overwriting files in the default cache location, as files added to the cache get a random identifier to try to avoid overwriting and to allow for essentially duplicate entries.


You can always get the cache location of a bfc object by calling bfccache(bfc) in case a user specific directory is used.



Lori Shepherd

Bioconductor Core Team

Roswell Park Cancer Institute

Department of Biostatistics & Bioinformatics

Elm & Carlton Streets

Buffalo, New York 14263

________________________________
From: Bioc-devel <bioc-devel-bounces at r-project.org> on behalf of Michael Love <michaelisaiahlove at gmail.com>
Sent: Friday, December 1, 2017 10:28:48 AM
To: bioc-devel at r-project.org
Subject: [Bioc-devel] BiocFileCache for developers

hi,

I'm writing a function which currently uses BiocFileCache to store a
small data.frame and one or more TxDb objects, so that these objects
are persistent and available across sessions (or possible available to
multiple users).

In the simplest case, I would call

bfc <- BiocFileCache()

inside my function, which will check the default location:

user_cache_dir(appname = "BiocFileCache")

In general, should developers also support the user specifying a
specific location for the BiocFileCache? So functions using
BiocFileCache should have an argument that overrides the above
location?

thanks,
Mike

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