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Re: A preliminary stab at Flow-Based Programming

by Matts (Deacon)
on Mar 05, 2002 at 10:37 UTC ( #149322=note: print w/ replies, xml ) Need Help??

in reply to A preliminary stab at Flow-Based Programming

Way cool! Sorry, don't have much to add or say, but this looks really neat. Of course component based programming is a pipe dream, but it's interesting to see this stuff coming together.

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Re: Re: A preliminary stab at Flow-Based Programming
by Masem (Monsignor) on Mar 05, 2002 at 15:01 UTC
    I do believe that FBP is a feasible goal; it does require more processor overhead and memory use than your typical procedural or OOP programming, and just like with those situations, FBP isn't a solution to all problems, only to a small subset. FBP also requires that the components are well designed with sufficient refactoring involved as to make sure most basic operations can be reconstructed with the right components. I think after a few more rounds of work, what I've got right now will start to look a little bit more interesting.

    But while I've got matts ear... :-) One of the problems I had when putting the Merger together is that apparently SAX elements cannot tell whom sent the event or where the event is going. Because of how I set it up, the Merger SAX events were recieving events from two different streams at the same time due to how SAXT and the event tree worked. I had to use a somewhat icky hack for this (using

    do { package DB; @callarr = caller(3); }; my @args = @DB::args; my $sender = $args[0];
    which is similar to code in Carp.) in order to id which dataset I was getting this from. Now, of course, on the way to work I thought of a better solution, possibly using closures, that would be able to connect multiple incoming streams at the same component, but I haven't tried to program this in yet. But in general, is there any other way of getting the sending of a SAX event while in a SAX event?

    Dr. Michael K. Neylon - || "You've left the lens cap of your mind on again, Pinky" - The Brain
    "I can see my house from here!"
    It's not what you know, but knowing how to find it if you don't know that's important

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