5:13 p.m.
I have a global defined and I am trying to use it from a function. When my
rule gets loaded into my knowledge base, I always get an error complaining
about the global not being resolved.
---- simplified snippet ----
global int x;
function void foo(int n) {
x = n;
}
------------------------------
I get this kind of error "Function Compilation error: foo (line:20) x can
not resolved".
Should this work?
TIA,
Bob
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6:35 p.m.
Do not know if this helps or explains but I found this in the documentation
in section 5.5.2
http://docs.jboss.org/drools/release/5.2.0.Final/drools-expert-docs/html/...
here .
From the document:
/Globals are not designed to share data
between rules and they should never
be used for that purpose. Rules always reason and react to the working
memory state, so if you want to pass data from rule to rule, assert the data
as facts into the working memory.
It is strongly discouraged to set or change a global value from inside your
rules. We recommend to you always set the value from your application using
the working memory interface./
How I read that is prolly not... However, I am not entirely sure I
understand why you are doing what you are doing...
Hope it points you in the direction of your solution...
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1:20 a.m.
Global "variables" aren't plain old Java variables; they are kept in a
wrapped map. Functions are passed to a Java compiler "as is", with only the
import list added to the compilation unit.
So you can use a global in a DRL function
- by passing it as a parameter,
- by accessing the global via the interface org.drools.runtime.Globals,
which requires that you have the session object available so you can do
kSession.getGlobals().
The second option brings us back to square 1: you can't use a global... But
a public static from any application class might be used - imports are
available in functions. Which, after all, could be used for your 'x' in the
first place.
-W
On 21 July 2011 00:13, bob.breitling <bob.breitling(a)rrd.com> wrote:
I have a global defined and I am trying to use it from a function.
When my
rule gets loaded into my knowledge base, I always get an error complaining
about the global not being resolved.
---- simplified snippet ----
global int x;
function void foo(int n) {
x = n;
}
------------------------------
I get this kind of error "Function Compilation error: foo (line:20) x can
not resolved".
Should this work?
TIA,
Bob
--
View this message in context:
http://drools.46999.n3.nabble.com/Globals-from-functions-tp3186882p318688...
Sent from the Drools: User forum mailing list archive at Nabble.com.
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