Erm ... a "MOOC"?
On Tue, Oct 1, 2013 at 9:14 PM, Marshall Bockrath-Vandegrift < llas...@gmail.com> wrote: > Hi all: > > I was wondering – does anyone have any experience with or patterns for > integrating Clojure with existing Java dependency injection frameworks? > I’m working with the LensKit framework [1] for a MOOC and it uses a > JSR-330/javax.inject dependency-injection framework named `grapht` [2] > for, well, everything. In some examples dependency-injection is even > used to provide input data file paths (!). As far as I can tell, the > injection happens entirely via invoking some sort of concrete, > user-provided, annotated constructor which accepts injected instances on > (potentially annotated) constructor parameters. > > My thoughts thus far have centered on two basic potential approaches: > > 1. Implement small Java stubs with appropriately-annotated constructors > for every injection point. The downside is that these stubs are > (probably) not very reusable. Injected instances are only injected at > the constructor parameters, so needing a different set of injected > instances requires a different class/constructor. > > 2. Dynamically generate stub classes exposing constructors which accept > some arbitrary per-class set of inject-able parameters. There might be > an easier way to do it, but that’s the approach I’ve tried out thus-far > using ASM and the Clojure dynamic class loaders to produce “Provider” > factory classes: > > https://github.com/llasram/esfj > > The largest problem with this approach is that the actual factory > implementation still needs to be injected somehow. I thought about > stashing a function in a Var linked to the class, but have instead just > made the implementation function itself another inject-able IFn > parameter. This avoids namespace-abuse, but also means injecting > Clojure implementations involves doing *more* dependency injection than > with plain Java, which doesn’t seem right. > > Thoughts? > > [1] http://lenskit.grouplens.org/ > [2] https://github.com/grouplens/grapht > > -Marshall > > -- > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
