factor/extra/rosetta-code/text-processing/max-licenses/max-licenses.factor

81 lines
2.5 KiB
Factor

! Copyright (c) 2012 Anonymous
! See http://factorcode.org/license.txt for BSD license.
USING: accessors http.client io io.encodings.ascii io.files
io.files.temp kernel math math.parser memoize sequences
splitting urls ;
IN: rosetta-code.text-processing.max-licenses
! http://rosettacode.org/wiki/Text_processing/Max_licenses_in_use
! A company currently pays a fixed sum for the use of a
! particular licensed software package. In determining if it has a
! good deal it decides to calculate its maximum use of the
! software from its license management log file.
! Assume the software's licensing daemon faithfully records a
! checkout event when a copy of the software starts and a checkin
! event when the software finishes to its log file. An example of
! checkout and checkin events are:
! License OUT @ 2008/10/03_23:51:05 for job 4974
! ...
! License IN @ 2008/10/04_00:18:22 for job 4974
! Save the 10,000 line log file from here into a local file then
! write a program to scan the file extracting both the maximum
! licenses that were out at any time, and the time(s) at which
! this occurs.
TUPLE: maxlicense max-count current-count times ;
<PRIVATE
: <maxlicense> ( -- max ) -1 0 V{ } clone \ maxlicense boa ; inline
: out? ( line -- ? ) [ "OUT" ] dip subseq? ; inline
: line-time ( line -- time ) " " split harvest fourth ; inline
: update-max-count ( max -- max' )
dup [ current-count>> ] [ max-count>> ] bi >
[ dup current-count>> >>max-count V{ } clone >>times ] when ;
: (inc-current-count) ( max ? -- max' )
[ [ 1 + ] change-current-count ]
[ [ 1 - ] change-current-count ]
if
update-max-count ; inline
: inc-current-count ( max ? time -- max' time )
[ (inc-current-count) ] dip ;
: current-max-equal? ( max -- max ? )
dup [ current-count>> ] [ max-count>> ] bi = ;
: update-time ( max time -- max' )
[ current-max-equal? ] dip
swap
[ [ suffix ] curry change-times ] [ drop ] if ;
: split-line ( line -- ? time ) [ out? ] [ line-time ] bi ;
: process ( max line -- max ) split-line inc-current-count update-time ;
MEMO: mlijobs ( -- lines )
"mlijobs.txt" temp-file dup exists? [
URL" http://rosettacode.org/resources/mlijobs.txt"
over download-to
] unless ascii file-lines ;
PRIVATE>
: find-max-licenses ( -- max )
mlijobs <maxlicense> [ process ] reduce ;
: print-max-licenses ( max -- )
[ times>> ] [ max-count>> ] bi
"Maximum simultaneous license use is " write
number>string write
" at the following times: " print
[ print ] each ;