Hi Christian,I repoen this discussion about dynamic module loading. This issue is getting more and more blocking for us. Let me try to re-expain our needs.We've written a restXQ based webapp extendable with a plugin based mechanism, where plugins modules provide functions to be called from a main module. But to be able to call a plugin function from the main module, the plugin module has to be imported by the main module. As far as we know, this can only be done with a import module staetment. Thus, users who have installed our webapp and who want to install plugins have to dig into the xquery code to add these import statements. Even with a good documentation, for non technical users, this is to much to ask. If we could dynamically import modules with a function similar to exist's util:import-module, the plugin installation process would be dramatically simplified.Do you have any plan to implement such a function ? Or is there any workaround we could use ?
Best,Jean-PhilippeOn Fri, Jun 21, 2013 at 4:43 PM, Christian Grün <christian.gruen@gmail.com> wrote:
Hi Jean-Philippe,
thanks for providing us with the (concise) details.
In our existing RESTXQ projects, we directly decorate all executable
functions with specific %rest:path annotations; this way, there is no
need for an additional “dispatcher” function that delegates a call to
a specific module or function. You can dynamically add and remove
modules to your web application, as all .xqm files will automatically
be parsed for restxq annotations before each query execution. Next,
the implementation is smart enough to only parse code that has ben
changed, so you shouldn’t encounter any bottlenecks even when working
with hundreds of restxq modules. But I’m not sure if adding modules
with restxq entry points is a reasonable alternative for your
approach?
Your feedback is welcome; feel free to ask for more details,
Christian
___________________________
2013/6/21 Jean-philippe Magué <jean-philippe.mague@ens-lyon.fr>:
> Dear Christian,
>
> Thanks for your response. I'm going to try be more specific, but to remain
> concise.
>
> In our restxq application, we have one "main" module and several "dependent"
> modules. The main module receives the http requests (well, it declare
> functions annotated with a path, say ourApp/{$param}), and calls functions
> in one of the dependent module. This dependent module is determined by the
> path : a request to ourApp/moduleA will cause the main module to use
> functions in the moduleA dependent module, while a request to ourApp/moduleB
> will cause it to call functions in the moduleB dependent module.
>
> It works just well if we import all the dependent modules in the main module
> using the regular way, with import module statements. Yet, we want to go one
> step forward and import the dependent modules only when/if needed. More
> precisely, we'd like to be able to add new dependent modules in the restxq
> directory without having to modify the main module by adding new import
> module statements.
>
> But it's probably some kind of inappropriate perfectionism that isn't worth
> spending much time !
>
> Best,
>
> Jean-Philippe
>
> PS: Thanks for looking at the circular import issue. Having our dependent
> modules importing back the main module would be very helpful!
>
>
> On Thu, Jun 20, 2013 at 10:44 PM, Christian Grün <christian.gruen@gmail.com>
> wrote:
>>
>> Dear Jean-Philippe,
>>
>> as you correctly guessed, there is no function in BaseX for
>> dynamically importing XQuery modules. The function xquery:invoke [1]
>> may serve a similar purpose. I’m not sure how the invocation of Java
>> code could help here, so could you give us some more information on
>> what you plan to do, and what needs to be done at runtime in your
>> scenario?
>>
>> Thanks,
>> Christian
>>
>> PS: our team member Leo is currently having a look at the circular
>> module import issue.
>>
>> [1] http://docs.basex.org/wiki/XQuery_Module#xquery:invoke
>> ___________________________
>>
>> > Exist-db has an util:import-module function that allows to dynamically
>> > import an XQuery module at run time. I haven't found anything equivalent
>> > in
>> > BaseX. Is that right ?
>> >
>> > I have also tried to see how to implement such a function directly in
>> > Java,
>> > but as far as I understand the module parsing process, functions prefix
>> > are
>> > checked at compile time. That would compromise any attempt to write such
>> > a
>> > function. Am I right ?
>> >
>> > Best,
>> >
>> > Jean-Philippe
>> >
>> >
>> > --
>> > Jean-Philippe Magué
>> > Maître de Conférences en Humanités Numériques
>> > Responsable de l'Atelier des Humanités Numériques : ahn.ens-lyon.fr
>> > Ecole Normale Supérieure de Lyon
>> > +33 (0)4 26 23 38 08
>> >
>> > --
>> >
>> > "Using computers will therefore lead us to a more profound and
>> > systematic
>> > knowledge of human expression; in principle, it can help us to be more
>> > humanistic than before."
>> > Busa, 1980.
>> >
>> > _______________________________________________
>> > BaseX-Talk mailing list
>> > BaseX-Talk@mailman.uni-konstanz.de
>> > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk
>> >
>
>
>
>
> --
> Jean-Philippe Magué
> Maître de Conférences en Humanités Numériques
> Responsable de l'Atelier des Humanités Numériques : ahn.ens-lyon.fr
> Ecole Normale Supérieure de Lyon
> +33 (0)4 26 23 38 08
>
> --
>
> "Using computers will therefore lead us to a more profound and systematic
> knowledge of human expression; in principle, it can help us to be more
> humanistic than before."
> Busa, 1980.
--
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