[rules-dev] Functional programming in Drools: closures

[Wolfgang Laun]

Last time Mark asked, there was a huge outcry - some people using some Java
that's standing still at Java 5.
-W

On 20 October 2011 13:21, Toni Rikkola <toni.rikkola at gmail.com> wrote:

> I would also like to keep it as close to Java as possible.
>
> There are few problems here:
> * It could never go beyond Java
> * We are using Java 5 and just considering Java 6, this would be a huge
> leap :-)
>
> But then again if we don't use the Java way, then what will we do when
> Drools reaches Java 8, support both?
>
> Toni
>
> On Oct 20, 2011, at 11:08 AM, Geoffrey De Smet wrote:
>
>  Interesting stuff.
> This is basically
>   "closures" which will be available in JDK 8
>   + LHS closure pattern support
>
> 1) About "closures" which will be available in JDK 8:
> Since functions contain Java code, which is imperative, not declarative, I
> don't consider that DRL turf any more.
> *Our closure syntax should there should be exactly the same as Java 8.*
> Here's their syntax, which looks the same on first sight, but the devil is
> in the details (= unreleased spec):
>
> http://mail.openjdk.java.net/pipermail/lambda-dev/2011-September/003936.html
> Either we wait for JDK 8 to be released to support closures (current
> release date is 2012 according to Mark R.'s "plan B" that released JDK 7 in
> 2011)
> or we implement it just like the JDK8 with the exact same syntax (which is
> a LOT of work).
>
> 2) About LHS closure pattern support.
> This builds on top of 1) to allow usage of closures in the LHS.
> Cool stuff, I like the piping idea.
>
> Op 19-10-11 23:12, Mauricio Salatino schreef:
>
> Hi Mario, that document looks great.. I will take some time to read it and
> I will try to give some feedback.
> I was playing with cypher (from neo4j, a graph oriented DB) (total newbie
> on that) but looking at your in line acc functions I think that we can take
> some concepts from cypher and apply them in DRL.
> Cheers
>
> On Wed, Oct 19, 2011 at 5:59 PM, Mario Fusco <mario.fusco at gmail.com>wrote:
>
>> Hi all,
>>
>> as anticipated by Mark, I put down some ideas on how we could start
>> introducing some functional programming features in the DRL.
>>
>> http://community.jboss.org/wiki/FunctionalProgrammingInDrools
>>
>> It's needless to say that the document has to been considered just a draft
>> in its very first stage and any feedback or suggestion to improve or clarify
>> it is welcome.
>>
>> Mario
>>
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>>
>>
>
>
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>  - Salatino "Salaboy" Mauricio -
>
>
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>
> --
> With kind regards,
> Geoffrey De Smet
>
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