Re: [rules-users] How to pass global variables to a function called in a condition

Translation: If the LHS of your rules are going to use globals, make sure to set them BEFORE you insert/update/retract any fact. :P Best Regards, XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Esteban Aliverti - Developer @ http://www.plugtree.com - Blog @ http://ilesteban.wordpress.com 2011/8/25 Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; > Conditions are evaluated when facts are inserted, modified and deleted. > -W > > > 2011/8/25 Matthew Erler <wires8(a)yahoo.com&gt; > >> In Drools 5 I'm passing in two global Date objects and need to find the >> difference in days between them. I've discovered that the function >> parameters (fromDate and toDate in my case) are null in the condition when >> the function is called, but when the function is called in the consequence >> they have values. I can see that because the output of the following rule >> is: >> fromDate is null >> toDate is null >> I'm in dateDiff and the date diff is: 14 >> >> I'm guessing that Drools doesn't make globals t available at the point >> that I need them. Can anyone confirm this and offer a solution? >> >> Here is the rule file itself: >> >> import java.util.Date; >> import org.joda.time.DateMidnight; >> import org.joda.time.Days; >> >> global java.util.Date fromDate; >> global java.util.Date toDate; >> >> >> rule "dateDiff" >> dialect "mvel" >> when >> eval(getDaysBetweenStartAndEndDate(fromDate, toDate) < 10) >> then >> System.out.println( "I'm in dateDiff and the date diff is: " >> + getDaysBetweenStartAndEndDate(fromDate, toDate)); >> end >> >> >> function int getDaysBetweenStartAndEndDate(Date fromDate, Date toDate) { >> if (fromDate==null) System.out.println("fromDate is null"); >> if (toDate==null) System.out.println("toDate is null"); >> return Days.daysBetween(new DateMidnight(fromDate), new >> DateMidnight(toDate)).getDays(); >> } >> >> _______________________________________________ >> 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