[jboss-jira] [JBoss JIRA] (DROOLS-5220) Make @watch annotation to also work with oopath

[Mario Fusco (Jira)]

     [ https://issues.redhat.com/browse/DROOLS-5220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco updated DROOLS-5220:
--------------------------------
    Sprint:   (was: 2020 Week 16-18 (from Apr 13))


> Make @watch annotation to also work with oopath 
> ------------------------------------------------
>
>                 Key: DROOLS-5220
>                 URL: https://issues.redhat.com/browse/DROOLS-5220
>             Project: Drools
>          Issue Type: Bug
>            Reporter: Mario Fusco
>            Assignee: Mario Fusco
>            Priority: Major
>
> Property reactivity is currently working on oopath as demostrated by this test case:
> {code}
>     @Test
>     public void testPropertyReactivityWithOOPath() {
>         String str =
>                 "import " + Person.class.getCanonicalName() + ";" +
>                 "import " + AdultUnit.class.getCanonicalName() + "\n" +
>                 "rule Adult @Unit( AdultUnit.class ) when\n" +
>                 "    $p : /persons[name == \"Mario\"]\n" +
>                 "then\n" +
>                 "    modify($p) { setAge($p.getAge()+1) };\n" +
>                 "end\n";
>         KieContainer kieContainer = getKieContainer( null, str );
>         RuleUnitExecutor executor = RuleUnitExecutor.newRuleUnitExecutor( kieContainer );
>         Person mario = new Person( "Mario", 45 );
>         Person sofia = new Person( "Sofia", 8 );
>         DataSource<Person> persons = DataSource.create( mario, sofia );
>         AdultUnit unit = new AdultUnit(persons);
>         assertEquals(1, executor.run( unit ) );
>         assertEquals(46, mario.getAge() );
>     }
> {code}
> Conversely what it is not working (it doesn't compile at all) is the use of the @watch annotation like in
> {code}
>     @Test
>     public void testPropertyReactivityWithOOPathAndWatch() {
>         String str =
>                 "import " + Person.class.getCanonicalName() + ";" +
>                 "import " + AdultUnit.class.getCanonicalName() + "\n" +
>                 "rule Adult @Unit( AdultUnit.class ) when\n" +
>                 "    $p : /persons[$age : age, name == \"Mario\"] @watch( !age )\n" +
>                 "then\n" +
>                 "    modify($p) { setAge($age+1) };\n" +
>                 "end\n";
>         KieContainer kieContainer = getKieContainer( null, str );
>         RuleUnitExecutor executor = RuleUnitExecutor.newRuleUnitExecutor( kieContainer );
>         Person mario = new Person( "Mario", 45 );
>         Person sofia = new Person( "Sofia", 8 );
>         DataSource<Person> persons = DataSource.create( mario, sofia );
>         AdultUnit unit = new AdultUnit(persons);
>         assertEquals(1, executor.run( unit ) );
>         assertEquals(46, mario.getAge() );
>     }
> {code}
> Of course this can work only on a one-level oopath. It has to be decided what to do (trigger a compile time error?) when trying to use that annotation on a oopath made of 2 or more chunks.



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