On 10/26/07, Ernest Friedman-Hill <[EMAIL PROTECTED]> wrote: > > To use reflection on a class (which the JessDE will do now, because > it uses ReflectionClassResearcher), you have to load the class. That > means that if, say, you're editing a file that includes "(defclass > Foo Foo)", that your class Foo will be loaded into Eclipse. Normally, > this isn't a big deal, but what if that class does something weird in > its static init block -- like register itself as a JDBC driver or > something? A problem like this has actually already hit an existing > JessDE user.
OK. (Although excessive activities in static initializers is suspicious.) Eclipse itself learns about library classes *not* by using > reflection, but with its own library that parses class files without > loading them. Eclipse developers are supposed to use this API rather > than reflection. So far, the JessDE doesn't do the right thing, but > soon it will. Hmm, although I'd caution against doing this in the JDE and that when executing stand-alone. Imagine that JessDE user's surprise (or despair) if all goes well in the JDE, and behaves differently when deployed. Maybe the best thing to do would be to, instead of extending > ReflectionClassResearcher, to implement ClassResearcher and hold a > reference to the previous ClassResearcher; forward calls to it, then > modify and return the results. Make sense? That would work regardless > of the technology in use. Done. See http://herzberg.ca.sandia.gov/jesswiki/view?NoClassSlotUserFunction I've incorporated your cautionary remark into the introductionary paragraphs. Thanks! Wolfgang On Oct 25, 2007, at 5:17 PM, Wolfgang Laun wrote: > > > Can you rely on Jess ClassResearcher and whatever is used under > > Eclipse > > to always produce the same result? > > > > Granted (and I do assume) that you can: What is the benefit of using > > some JDE library function as compared to the ClassResearcher? It can't > > be a performance issue, because obtaining the template definition from > > a Java class is highly unlikely to be required frequently. > > > > Which classes, exaclty, are "your classes" which won't be loaded > > under the JessDE? > > > > Thanks > > Wolfgang > > > > On 10/25/07, Ernest Friedman-Hill <[EMAIL PROTECTED]> wrote: > > Interesting idea! I hadn't thought about ClassResearcher as a user > > hook; It was introduced as a way to let Jess use reflection most of > > the time, but use Eclipse's JDE libraries inside the JessDE so that > > the JessDE doesn't actually load your classes. Therefore this must be > > used cautiously because at some point it will break inside Eclipse > > (although of course an Eclipse-specific version would also be > > possible.) > > > > > > On Oct 25, 2007, at 12:01 PM, Wolfgang Laun wrote: > > > > > Deriving a deftemplate from a Java class with, e.g., > > > (deftemplate Account (declare (from-class Account))) > > > invariably adds a slot "class", due to getClass() inherited from > > > java.lang.Object. > > > > > > If you want to get rid of this, see the Jess userfunction I've > > > added to the > > > Jess Wiki: http://herzberg.ca.sandia.gov/jesswiki/view? > > > NoClassSlotUserFunction > > > > > > Cheers, > > > Wolfgang > > > > > > > --------------------------------------------------------- > > Ernest Friedman-Hill > > Informatics & Decision Sciences Phone: (925) 294-2154 > > Sandia National Labs FAX: (925) 294-2234 > > PO Box 969, MS 9012 [EMAIL PROTECTED] > > Livermore, CA 94550 http://www.jessrules.com > > > > -------------------------------------------------------------------- > > To unsubscribe, send the words 'unsubscribe jess-users > > [EMAIL PROTECTED]' > > in the BODY of a message to [EMAIL PROTECTED], NOT to the list > > (use your own address!) List problems? Notify owner-jess- > > [EMAIL PROTECTED] > > -------------------------------------------------------------------- > > > > > > --------------------------------------------------------- > Ernest Friedman-Hill > Informatics & Decision Sciences Phone: (925) 294-2154 > Sandia National Labs FAX: (925) 294-2234 > PO Box 969, MS 9012 [EMAIL PROTECTED] > Livermore, CA 94550 http://www.jessrules.com > > -------------------------------------------------------------------- > To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' > in the BODY of a message to [EMAIL PROTECTED], NOT to the list > (use your own address!) List problems? Notify [EMAIL PROTECTED] > -------------------------------------------------------------------- > >
