Re: [rules-users] Importing functionS from another drl in 5.5.0
6.0 now has dynamic jars that can contain drl and java. Any .java can be dynamically
added, but not removed or updated (limitations of a class loader). We put all java classes
into the root class loader. So you can do this for classes with static methods, and they
will be available to all rules in all packages.
6.x had class loader performance issues, when trying to resolve across packages, and it
was even possible to put it into an infinite loop - we used a composite class loader
approach. To keep rules dynamic, and to keep fast and robust class loaders we use the more
traditional hierarchical class loader now, instead of a composite. So each drl namespace
gets its own class loader, that is dropped and reloaded each time a rule is updated, but
it's parent is the root class loader,and that's all it can see - not other peer
drl class loaders.
Mark
On 19 Jul 2013, at 09:46, Sonata <plz.write.to(a)gmail.com> wrote:
Mark Proctor wrote
> Unfortunately not, and in 6.0 that won't be possible as there is stricter
> class loader isolation between drl namespace files (limitation of a
> dynamic system on the JVM). However functions are just static java
> methods, and those work fine too, when defined on a class in the parent
> class loader.
>
> Mark
Thanks Mark. So in 6.0, we are not even able to use drl functions from
another drl?
I sort of require that because I will have rules that are added to the kbase
in runtime with updated functions.
Then what about this? If I create a java class with all the static functions
wrapped in jar (instead of defining them in drl), would that be possible to
dynamically load the jar into the current kbase first and then let those
rules added in runtime to use functions from that jar by simply adding
import function mydynamicjar.MyFunc.*; ?
A simple code snippet on how to achieve that would be nice, thanks a lot!
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