Hi there, according to the online documentation globals are supported in the LHS of a rule, yet requires a bit of care to use there. But how do I use globals in the LHS? Is there any option to access a globals variable directly like: globals List myList rule "SomeRule" when myList.size() == 2 then ... Or can I have to use globals only in eval() statements? cu, Michael _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Hi Darko, > Global java.util.List myList > > rule "SomeOtherRule" > when > myList(size==2); > then > ... > end > Sorry, won't work. Unable to resolve object type 'diameters'. What works though is: rule "abc" when eval (diameters.size() == 2) then ... end cu, Michael _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Darko IVANCAN wrote: > I'm not sure,but myList(size()==2) could work though. > > Does it ? > No, doesn't work. My interpreation so far: a) globals are only possible in eval() statements b) access to methods of global variables are not supported. and possibly c) only properties of globals can be accessed (not tested as a list has no useful property imho) Well, I can life with the eval() statements but think they are slightly inconvenient and make the code less explicit and less readable. cu, Michael _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Darko IVANCAN wrote: > I'm not sure,but myList(size()==2) could work though. > > Does it ? > No, doesn't work. My interpreation so far: a) globals are only possible in eval() statements b) access to methods of global variables are not supported. and possibly c) only properties of globals can be accessed (not tested as a list has no useful property imho) Well, I can life with the eval() statements but think they are slightly inconvenient and make the code less explicit and less readable.

cu, Michael _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Darko IVANCAN wrote: > Hmm, > > Right. > Size is not a property (getSize), thus (size==2) does not work. > > I'm not sure,but myList(size()==2) could work though. > you would have to do List() from myList, otherwise it assumes its reasoning over data asserted into the working memory - hmm I assume that works, never tried, as I'm not sure its a valid use case - just assert the object. You can use globals freely in field constraints. Remember the engine has no idea when globals change, so if they are used in the LHS they should be considered immutable. > Does it ? > > darko > > > On 27/11/2007 15:09, Michael Zimmermann wrote: > >> Hi Darko, >> >> >> >>> Global java.util.List myList >>> >>> rule "SomeOtherRule" >>> when >>> myList(size==2); >>> then >>> ... >>> end >>> >>> >> Sorry, won't work. Unable to resolve object type 'diameters'. What works >> though is: >> >> rule "abc" >> when >> eval (diameters.size() == 2) >> then >> ... >> end >> >> cu, Michael >> >> >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> >> >> > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > ------------------------------------------------------------------------ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users