On 3 Jul 2020, at 11:09, Paul SAVARY <paul.savary at univ-fcomte.fr> wrote:
I thank you Rainer.
Then, I think I will allow users to download the .jar file from an url into the user data directory.
I get the path to this directory with "rappdirs::user_data_dir()".
Do you know how to check if java is installed on their machine?
I thought about using something like that:
jv <- system2("java", args = c("-version"))
if(jv != 0){
stop("You have to install java on your machine.")
}
Cheers
Paul
De: "Rainer M Krug" <Rainer at krugs.de>
?: "Paul SAVARY" <paul.savary at univ-fcomte.fr>
Cc: "r-package-devel" <r-package-devel at r-project.org>
Envoy?: Vendredi 3 Juillet 2020 10:33:15
Objet: Re: [R-pkg-devel] Making possible the use of external java codes by downloading it
Please check out the recent thread "Proper CRAN way - How to handle dependency of java jar file?? About a week ago - I asked essentially the same questions.
Cheers,
Rainer
On 3 Jul 2020, at 10:15, Paul SAVARY <paul.savary at univ-fcomte.fr <mailto:paul.savary at univ-fcomte.fr>> wrote:
Hello everyone,
I would like to include external java codes (.jar files) to a package in order to speed up some computations.
However, this would increase the package size above 5 Mb and this code would not be working for users without java installation.
Instead, I could include a default parameter in the function calling another R package making the same computation but more slowly. It would be best for users without java on their computer.
Besides, I could allow users to download the external java code from a stable url, and include in the R function all the arguments to launch this java code (wrapper for the java code). When downloaded, the jar file should be copied directly into the extdata directory in the user computer if possible.
Does it seem feasible to you?
Many thanks
Regards
Paul