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Re: sequential file handling

by maverick (Curate)
on May 30, 2002 at 23:07 UTC ( #170545=note: print w/replies, xml ) Need Help??


in reply to sequential file handling

Here's how to do just the 'round robin' part.
my @dirs = qw{ dir1 dir2 dir3 }; my $num_targets = $#dirs + 1; my $counter = 0; foreach (0..10) { my $target = $dirs[$counter % $num_targets]; print "$_ => $target\n"; $counter++; }
The % operator gives you the remainder of the division of $counter / $num_targets, which will be 0, 1 or 2 for any value of $counter. Use that number to select the proper directory out of the array.

Run this little snippet and you can see the result...

/\/\averick
OmG! They killed tilly! You *bleep*!!

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[ambrus]: Corion: as for that, I talked with schmorp, and looked a bit more at Prima
[ambrus]: Corion: from the docs, it definitely looks like it would be possible to write an AnyEvent driver for it using Prima::File and Prima::Timer.
[ambrus]: (I haven't found an idle event.)
[ambrus]: However, I also looked at the internals, and found two interesting things:
[marto]: stupid xpath question, I have a xpath copied from the browser, is the * wildcard supposed to work for IDs? e.g. '//*[@id="*"]/ div/div/header/p/a '?
[ambrus]: The main loop for unixish systems is in https://metacpan. org/source/ KARASIK/Prima-1. 49/unix/apc_app.c. It is a hand-rolled select loop, but also always spins at least once every 0.2 seconds for some reason.
[ambrus]: marto: no, not that way. if you just want to test for an existing id attribute, then write *[@id] , or you can match a regexp to the value of that attribute like *[@id=~/something/ ]
[marto]: ambrus, thanks I ended up going with '//*[starts- with(@id, "thread_")]...

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