[rules-dev] Functional programming in Drools: closures

[Toni Rikkola]

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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> -- 
> With kind regards,
> Geoffrey De Smet
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