Util::TimeTracker(3) User Contributed Perl Documentation Util::TimeTracker(3)
NAME
Log::Log4perl::Util::TimeTracker - Track time elapsed
SYNOPSIS
use Log::Log4perl::Util::TimeTracker;
my $timer = Log::Log4perl::Util::TimeTracker->new();
# equivalent to Time::HiRes::gettimeofday(), regardless
# if Time::HiRes is present or not.
my($seconds, $microseconds) = $timer->gettimeofday();
# reset internal timer
$timer->reset();
# return milliseconds since last reset
$msecs = $timer->milliseconds();
# return milliseconds since last call
$msecs = $timer->delta_milliseconds();
DESCRIPTION
This utility module helps tracking time elapsed for PatternLayout's
date and time placeholders. Its accuracy depends on the availability of
the Time::HiRes module. If it's available, its granularity is
milliseconds, if not, seconds.
The most common use of this module is calling the gettimeofday()
method:
my($seconds, $microseconds) = $timer->gettimeofday();
It returns seconds and microseconds of the current epoch time. If
Time::HiRes is installed, it will simply defer to its gettimeofday()
function, if it's missing, time() will be called instead and
$microseconds will always be 0.
To measure time elapsed in milliseconds, use the reset() method to
reset the timer to the current time, followed by one or more calls to
the milliseconds() method:
# reset internal timer
$timer->reset();
# return milliseconds since last reset
$msecs = $timer->milliseconds();
On top of the time span between the last reset and the current time,
the module keeps track of the time between calls to
delta_milliseconds():
$msecs = $timer->delta_milliseconds();
On the first call, this will return the number of milliseconds since
the last reset(), on subsequent calls, it will return the time elapsed
in milliseconds since the last call to delta_milliseconds() instead.
Note that reset() also resets the time of the last call.
The internal timer of this module gets its time input from the POSIX
time() function, or, if the Time::HiRes module is available, from its
gettimeofday() function. To figure out which one it is, use
if( $timer->hires_available() ) {
print "Hooray, we get real milliseconds!\n";
} else {
print "Milliseconds are just bogus\n";
}
For testing purposes, a different time source can be provided, so test
suites can simulate time passing by without actually having to wait:
my $start_time = time();
my $timer = Log::Log4perl::Util::TimeTracker->new(
time_function => sub {
return $start_time++;
},
);
Every call to $timer->epoch() will then return a time value that is one
second ahead of the value returned on the previous call. This also
means that every call to delta_milliseconds() will return a value that
exceeds the value returned on the previous call by 1000.
LICENSE
Copyright 2002-2013 by Mike Schilli <m@perlmeister.com> and Kevin Goess
<cpan@goess.org>.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
AUTHOR
Please contribute patches to the project on Github:
http://github.com/mschilli/log4perl
Send bug reports or requests for enhancements to the authors via our
MAILING LIST (questions, bug reports, suggestions/patches):
log4perl-devel@lists.sourceforge.net
Authors (please contact them via the list above, not directly): Mike
Schilli <m@perlmeister.com>, Kevin Goess <cpan@goess.org>
Contributors (in alphabetical order): Ateeq Altaf, Cory Bennett, Jens
Berthold, Jeremy Bopp, Hutton Davidson, Chris R. Donnelly, Matisse
Enzer, Hugh Esco, Anthony Foiani, James FitzGibbon, Carl Franks, Dennis
Gregorovic, Andy Grundman, Paul Harrington, Alexander Hartmaier David
Hull, Robert Jacobson, Jason Kohles, Jeff Macdonald, Markus Peter,
Brett Rann, Peter Rabbitson, Erik Selberg, Aaron Straup Cope, Lars
Thegler, David Viner, Mac Yang.
perl v5.30.0 2017-02-21 Util::TimeTracker(3)
log-log4perl 1.490.0 - Generated Wed Jul 22 09:15:30 CDT 2020