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Using objects where you don't know the module's name until run time.

by Anonymous Monk
on Nov 07, 2000 at 03:17 UTC ( #40278=categorized question: print w/replies, xml ) Need Help??
Contributed by Anonymous Monk on Nov 07, 2000 at 03:17 UTC
Q&A  > object-oriented programming


Description:

I'm trying to build a wrapper class to hold one of an arbitrary number of "plug-in" modules. My motive here is to load the module, and then pass calls from the outside world to that module, failing gracefully if it can't perform the function. I get the name of the module out of a database query. I can do require $string no problem, but the issue then becomes how do I say $string->new?

Answer: Using objects where you don't know the module's name until run time.
contributed by tye

$string->new()
Yes, it really is that simple.

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    [Discipulus]: Corion are you would able to realize such thing? O_O
    [Corion]: In the same vein I have a script that automates Firefox to enter some data into another system. It's not faster than the people using the script if they were to do it manually, but they prefer not having to check the data and not having typos when ...
    [Corion]: ... entering the data
    [Corion]: Discipulus: I don't know whether I could really do that, but the init process itself mostly launches other processes, and the whole startup is just following a path of dependencies and making sure they are all running. Which basically is what ...
    [Discipulus]: when at work my time is (temporarly) owned by the firm, so i do not care (coworkers whatch movies.. I code Perl)
    [Corion]: ... make already does, except for files instead of programs. But maybe with some /proc hackery, that could be eliminated and one could use plain make :-D
    [choroba]: systemd just makes is asynchronous
    [choroba]: so, make -j
    [Corion]: Discipulus: Yeah - but when writing Perl to save time (instead of having fun), it helps to look whether you're actually saving time ;) Why spend 5 minutes doing manually what you can spend three years automating? ;)
    [Corion]: choroba: Oh, yeah :-D

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