newbie callback questions

From: Tore Halset (halse..vv.ntnu.no)
Date: Thu Feb 07 2008 - 05:23:40 EST

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    Hello.

    I just tried callbacks for the first time. I wanted to update a
    modified field every time a data object was changed. In the modeler I
    added a method called "onPreUpdate" of type pre-update for the entity.
    Then I added the following method in the data object.

            protected void onPreUpdate() {
                    setModified(new Date());
            }

    It seem to work very well. Is this the correct way to do it?

    In my simple case it would have been even nicer if the _MyEntity.java
    included something like "protected abstract void onPreUpdate();"
    generated from the model. Default MyEntity.java should include an emty
    stub for that method.

    Would that be a reasonable feature request? I am asking before
    registering as I am such a callback newbie.

    In modeler, the difference between callbacks and listeners are a bit
    confusing. Anyone having some ideas to how this interface could be
    clearer/simpler?

    Regards,
      - Tore.

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