Saxon

Legacy ID: #4926399 Legacy Poster: Chapman Flack (jcflack)

Hi, I would like to write a Java extension function that will accept a prepared expression to use as a callback. The Java code will supply the context item and $p1..$p9 parameters when making the callback. I would like the callback expression to have the caller's defined functions in scope. (saxon:expression arranges that, right?) It seems likely that I could get a start on this by imitating the code for saxon:sort. That code doesn't pass anything for $p1 .. $p9, but I think I see how to do that. Here's the question: the Java extension function will be invoking the callback from another thread. Are there environment pieces (like Controller, whose docs say it's not thread-safe) that I will need to clone or recreate in order to stay out of trouble? And what is the right way to do that so that the necessary static context for the prepared expression is preserved? Thanks, Chapman Flack