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Re^2: Are state machines just for parsing?

by samtregar (Abbot)
on Dec 08, 2004 at 22:03 UTC ( #413343=note: print w/ replies, xml ) Need Help??


in reply to Re: Are state machines just for parsing?
in thread Are state machines just for parsing?

That's a cool presentation. And the module looks great... except, why do I have to program Perl inside an XML file? This makes my skin crawl:

<workflow> <type>myworkflow</type> <state name="INITIAL"> <action name="upload file" resulting_state="uploaded" /> </state> <state name="uploaded" autorun="yes"> <action name="verify file" resulting_state="annotate"> <!-- everyone other than 'CWINTERS' must verify --> <condition test="$context->{user} ne 'CWINTERS'" /> </action> ...

I'd be much happier with:

my $workflow = Workflow::Generator->new(type => "myworkflow"); $state = $workflow->add_state(name => "INITIAL"); $state->add_action(name => "upload file", resulting_state => "uploa +ded"); $state = $workflow->add_state(name => "uploaded", autorun => "yes") +; $state->add_action(name => "verify_file", resulting_state => "annot +ate"); $condition = $state->add_condition(test => \&check_file);

It's more conscise and all the power of Perl is available for making repetitive structures from common data. If I ever decided to use Workflow I think Workflow::Generator would be my first project.

-sam


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Re^3: Are state machines just for parsing?
by lachoy (Parson) on Dec 09, 2004 at 02:33 UTC

    Well, the "perl in XML" part is entirely optional and is actually a recent addition. But I like the idea of creating it programmatically and it should be pretty easy, actually. I might swipe this for later -- with credit, of course...

    Chris
    M-x auto-bs-mode

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