[rules-users] dialect: Java or MVEL

[Godmar Back]

Change and re-compile the drool engine code?
If so, I vote for an enhancement request that let's drool dump the Java files.

On a separate note, how would I be able to pre-compile sets of rules -
would this process involve calling builder.getPackage(), then
serialize the resulting Package? Or would I need to serialize a
partial rule base? Or either?

In other words, is the compilation done on
"builder.addPackageFromDrl()", or done when "builder.getPackage()" is
called, or is it done when "Rulebase.addPackage()" is called?

Thank you for your help.

 - Godmar

On 9/24/07, Mark Proctor <mproctor at codehaus.org> wrote:
>
>  There is no .java file, all compilation is in memory. you can, if you
> change the code and re-compile by hand, dump the resulting template files.
>
>  Mark
>
>  Godmar Back wrote:
>  BTW, when using Java, is there a way to save the .java files created
> by the compiler? I would like to understand the specific
> environment/scope in which consequences are compiled. Right now, if
> something goes wrong, the .java are deleted right away. I looked at
> PackageBuilderOptions, but didn't see anything there.
>
>  - Godmar
>
> On 9/24/07, Mark Proctor <mproctor at codehaus.org> wrote:
>
>
>  Java is more mature in tooling and implementation and is still currently
> the default implementation and the recommended one if you are not sure.
> MVEL will eventually become the default dialect when it matures, its
> advantage is in the simpler language it provides, which helps make rules
> easier to read and write. It can also operate in reflection mode, which
> can really help for large rule based systems that have perm gen issues.
>
> Mark
> ekke wrote:
>
>
>  can someone tell me, when to use java or mvel as dialect ?
>
> I've experienced that in some cases inside the drl editor using java
> gives me more context-help then using mvel
>
> but: what can I do with java and not with mvel
> and what advantages has mvel compared with java
>
> which dialect is more performant ?
>
> thx for infos from insiders
>
> ekke
>
>
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