Re: [rules-dev] declare LocalEvent @role( event ) end

   Wolfgang,    I am not sure how useful such a no-field control fact is, but anyway, feel free to open a JIRA and propose a way to support that from a syntax perspective. I.e., we will probably need to use a new annotation to allow users to explicitly tell the engine to generate the no-field bean, what could be more cumbersome than simply use a dummy field in these specific cases.    Open for suggestions,    Edson 2010/11/10 Wolfgang Laun <wolfgang.laun(a)gmail.com&gt;: > I can declare a useful event type which doesn't have any fields > except the implicit timestamp and duration. As you've described, > the compiler assumes that this is an extension of an imported > fact, and complains if this cannot be found. > > Here is a complete, not too contrived use case. > > declare Trigger >  @role( event ) >  @expires( 1s ) >  void: Void         ## required due to compiler's insistence of > Trigger being defined elsewhere > end > > rule "1m ticker" >    timer(int: 1m 1m) > when > then >    insert( new Trigger() ); > end > > rule "count jobs 30 minutes before Trigger" > when >    $t: Trigger() >    Number( $i: intValue > 3 ) from accumulate( >       Job( this before[0,30m] $t ) >       count( 1 ) ) > then >    retract( $t ); >    System.out.println( "Too many jobs (" + $i + ") at " + clockAsString() ); > end > > Cheers > Wolfgang > > On 10 November 2010 16:03, Edson Tirelli <tirelli(a)post.com&gt; wrote: >>   Hi Wolfgang, >> >>   Not sure what is the intent with that? >> >>   Just to explain the design, the compiler differentiates two use >> cases: (1) if a declare has no fields in it, it understands the user >> is annotating an existing class. (2) If a declare has at least one >> field, then the compiler tries to generate a new class and annotate >> it. >> >>   In case (1) above, if the compiler does not find an existing class, >> it (correctly, IMO) raises an error. >> >>   Can you please clarify? >> >>   Thanks, >>       Edson >> >> 2010/11/10 Wolfgang Laun <wolfgang.laun(a)gmail.com&gt;: >>> This simple declare for a new (not imported) class isn't permitted by >>> the compiler, although it makes sense. >>> >>> Of course, it's possible to work around by adding a dummy field. >>> >>> But is this restriction intentional by design, to alert users when >>> they misspell a class name, or forget to import a class? >>> >>> If not, I'll make a request to permit this. >>> >>> -W >>> _______________________________________________ >>> rules-dev mailing list >>> rules-dev(a)lists.jboss.org >>> https://lists.jboss.org/mailman/listinfo/rules-dev >>> >> >> >> >> -- >>   Edson Tirelli >>   JBoss Drools Core Development >>   JBoss by Red Hat @ www.jboss.com >> >> _______________________________________________ >> rules-dev mailing list >> rules-dev(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-dev >> > > _______________________________________________ > rules-dev mailing list > rules-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-dev > --   Edson Tirelli   JBoss Drools Core Development   JBoss by Red Hat @ www.jboss.com _______________________________________________ rules-dev mailing list rules-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-dev