Thanks for the explanation So they are the same fact?
Thanks Salina ----- Original Message ----- From: Wolfgang Laun [mailto:[email protected]] To: [email protected], Rules Users List [mailto:[email protected]] Sent: Thu, 09 Feb 2012 15:18:32 +0800 Subject: Re: [rules-users] declared variables in rules loaded to the same knowledge base > On 09/02/2012, Salina Fung/UFL - ICIL <[email protected]> wrote: > > We have 2 rules - rule 1 and rule 2, both have > > declared variable @role(event) > > This is not a "variable" in the sense of the word as 99.99% use it. > > The "declare EventImpl @role(event)...end tells Drools that > facts of type EventImpl are facts with extended semantics, > i.e., a timestamp and duration, and Fusion functions can > be applied. Read the documentation! > > > > > > In the program with statements to define the rule > > > > << > > String rule1 = "package test001 import com.icil.event.*; declare EventImpl > > @role(event) end rule \"test 001\" when Integer() then > > System.out.println(\"rule test 001: there is an integer\"); end "; > > > > String rule2 = "package test002 import com.icil.event.*; declare EventImpl > > @role(event) end rule \"test 002\" when Integer() then > > System.out.println(\"rule test 002: there is an integer\"); end "; > >>> > > > > and then try to load these two into the same knowledge base using Drools > > 5.3, > > will get an runtime exception. But Drools 5.2, this is ok, with > > no error. > > I'm not trying to guess the exception. > > > > > > > Then in Drools 5.2 > > > > We try to print the address of the variable 'event' in the RHS of both > > rules, the > > address is the same in both rules, which means they are sharing the same > > instance? > > "event" is merely a word in the DRL text, recognized and discarded by > the DRL parser. So I'd be *very* much surprised if you can obtain its > "address" at runtime, in the RHS. > > It's a pity that you don't show the code with which you print the "address" > of something. In Java, that's quite an unusual thing to do. > > Please don't report about things without showing them, in full. > > -W > > > > > Is it the declared variables with the same name in separate > > rules being loaded in the same knowledge base, will just > > have ONE instance? > > > > > > > > Thanks > > Salina > > > > > > _______________________________________________ rules-users mailing list [email protected] https://lists.jboss.org/mailman/listinfo/rules-users
