> Thanks, it helps. > But there are some more questions. > 1. What is an official name of rule language, if it is not MVEL? Why "MVEL > dialect" in split constraints allow using code like: > $p: Person ( age > 21 ) DRL - presumably standing for Drools Rule Language > 2. Why it is not possible to use rules in actions in MVEL mode? I suppose it > would be useful. What do you actually mean by using a rule in an action.. The answer is likely to be it is due to the way that rules are declarative and not procedural and how the Rete algorithm works. > 3. How can I create new object in the constraint? For example, I have a > constraint: > > $p : Person( age < 21 ) > > - in this branch I need to create the new object "PersonFault" and insert it > to the working memory, but the code : > > $p : Person( age < 21 ) > $fault = new PersonFault($p, "WRONG AGE"); > kcontext.getKnowledgeRuntime().insert($fault); > > - is not working. Nor in the constraint, nor in the action...
It won't work in the constraint as it doesn't make sense to create objects in the constraint. The standard way to do it is as follows - also note the knowledge runtime methods are exposed directly (see http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/html_single/index.html#d0e5216) Rule "foo" when $p : Person(age < 21) then insert(new PersonFault($p, "WRONG AGE")); end Thomas ************************************************************************************** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the [email protected] and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 ************************************************************************************** _______________________________________________ rules-users mailing list [email protected] https://lists.jboss.org/mailman/listinfo/rules-users
