Hi Colin,
If you must call the Java constructor, you need reflection.
user=> (defrecord B [c])
user.B
user=> (def s "user.B")
#'user/s
user=> (.newInstance (first (.getDeclaredConstructors (Class/forName s)))
(object-array [1]))
#user.B{:c 1}
Thanks,
Ambrose
On Wed, Aug 6, 2014 at 6:37 PM, Colin Yates <colin.ya...@gmail.com> wrote:
> Hi,
>
> tldr; if I have a (defrecord MyRecord) in ns a.b.c and I have a string
> "a.b.c.MyRecord" how I can invoke (a.b.c.MyRecord.) (or (new
> a.b.c.MyRecord)?
>
> I thought this was going to be as simple as (defn cfn "a.b.c.MyRecord")
> ((symbol cfn).) but that throws an ArityException: wrong number of args (0)
> passed to Symbol. I
>
> I have a protocol with a number of implementations. Each installation
> will have a single implementation and will chose one based on an
> environment variable. At runtime I need to look at that environment
> variable which defines the fully qualified implementation of a protocol. I
> then need to instantiate that record.
>
> Architecturally equivalent to a simple plugin system. I could alias them
> all but that requires knowing about all the implementations which is a
> no-go.
>
> This is where I feel the pain of not having OSGi :).
>
> Thanks all!
>
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