On 07/27/2012 02:42 AM, Attila Szegedi wrote:
Greetings from a small Santa Clara Oracle corner office whose
surroundings are currently Swede-infested.
So, having cleared Dynalink 0.3 out of the way, I'm working on the
next version.
I'm rattling an idea the last few days about adding a new MOP
operation to Dynalink, "dyn:call", which'd allow calling of objects
that languages recognize as first-class functions. Typical candidates
are method handles, things implementing Callable etc. I started
thinking of how to expose Java methods of POJOs as something that can
be "dyn:call"-ed, and ended up with several different possibilities
(the easiest one, but probably the not entirely optimal one is
treating them as simple properties) as well as some interesting
longer-term ideas such as composite MOP operations.
The writeup is here, and I'd appreciate feedback, either on the Wiki
page itself or here in the e-mail thread:
<https://github.com/szegedi/dynalink/wiki/Request-for-comments:-Methods-as-properties-on-POJOs>
I'm not sure this is different from an object creation, it's a kind of
reification of a function/method,
so an object creation.
Now given that for some languages, System.out.println can be a constant,
the creation has to be done by an invokedynamic,
(in a lazy way by example) so must be a call of the meta object protocol.
Also, the default implementation should be able to do exactly what the
jdk8 will do for lambda, exactly for method reference, i.e transforms a
reference to a method (or a reference to a method + a receiver object)
to see them as on object implementing a SAM interface.
Note that if dynalink run on jdk8, it can directly calls the lambda
metafactory (the code used by java the language).
Thanks,
Attila.
cheers,
Rémi
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