Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

Re: FIFO logfile done with flat file?

by clintp (Curate)
on Jul 28, 2002 at 20:22 UTC ( #185844=note: print w/ replies, xml ) Need Help??


in reply to FIFO logfile done with flat file?

You could do it with a flat file. There's lots of ways. One script I had used a simple DBM file and went something like this (hope this is cut down right):

{ use Fcntl qw(:flock); my %h; my $size=5; sub ringopen { open(F, ">ring.lock") || die; flock(F, LOCK_EX); dbmopen(%h, "ring", 0666) || die; } sub ringclose { dbmclose(%h); close(F); } sub ringadd { ringopen(); local $_=$h{next}; delete $h{$_-$size} if (defined $_); $h{$h{next}++}=$_[0]; ringclose(); } sub ringdump { ringopen(); my @a=sort { $a <=> $b } grep /^\d+$/, keys %h; @a=@h{@a}; ringclose(); return @a; } }
And you used it like this:
for(0..9, 'a'..'z') { ringadd($_); } print ringdump();
To initialize the ring buffer, remove the ring* files.

YMMV, TIMTOWDI, etc..


Comment on Re: FIFO logfile done with flat file?
Select or Download Code

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://185844]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others about the Monastery: (15)
As of 2015-07-30 14:44 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (271 votes), past polls