1Util::TimeTracker(3) User Contributed Perl Documentation Util::TimeTracker(3)
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6 Log::Log4perl::Util::TimeTracker - Track time elapsed
7
9 use Log::Log4perl::Util::TimeTracker;
10 my $timer = Log::Log4perl::Util::TimeTracker->new();
12 # equivalent to Time::HiRes::gettimeofday(), regardless
14 # if Time::HiRes is present or not.
15 my($seconds, $microseconds) = $timer->gettimeofday();
16 # reset internal timer
18 $timer->reset();
19 # return milliseconds since last reset
21 $msecs = $timer->milliseconds();
22 # return milliseconds since last call
24 $msecs = $timer->delta_milliseconds();
25
27 This utility module helps tracking time elapsed for PatternLayout's
28 date and time placeholders. Its accuracy depends on the availability of
29 the Time::HiRes module. If it's available, its granularity is
30 milliseconds, if not, seconds.
31 The most common use of this module is calling the gettimeofday()
33 method:
34 my($seconds, $microseconds) = $timer->gettimeofday();
36 It returns seconds and microseconds of the current epoch time. If
38 Time::HiRes is installed, it will simply defer to its gettimeofday()
39 function, if it's missing, time() will be called instead and
40 $microseconds will always be 0.
41 To measure time elapsed in milliseconds, use the reset() method to
43 reset the timer to the current time, followed by one or more calls to
44 the milliseconds() method:
45 # reset internal timer
47 $timer->reset();
48 # return milliseconds since last reset
50 $msecs = $timer->milliseconds();
51 On top of the time span between the last reset and the current time,
53 the module keeps track of the time between calls to
54 delta_milliseconds():
55 $msecs = $timer->delta_milliseconds();
57 On the first call, this will return the number of milliseconds since
59 the last reset(), on subsequent calls, it will return the time elapsed
60 in milliseconds since the last call to delta_milliseconds() instead.
61 Note that reset() also resets the time of the last call.
62 The internal timer of this module gets its time input from the POSIX
64 time() function, or, if the Time::HiRes module is available, from its
65 gettimeofday() function. To figure out which one it is, use
66 if( $timer->hires_available() ) {
68 print "Hooray, we get real milliseconds!\n";
69 } else {
70 print "Milliseconds are just bogus\n";
71 }
72 For testing purposes, a different time source can be provided, so test
74 suites can simulate time passing by without actually having to wait:
75 my $start_time = time();
77 my $timer = Log::Log4perl::Util::TimeTracker->new(
79 time_function => sub {
80 return $start_time++;
81 },
82 );
83 Every call to $timer->epoch() will then return a time value that is one
85 second ahead of the value returned on the previous call. This also
86 means that every call to delta_milliseconds() will return a value that
87 exceeds the value returned on the previous call by 1000.
88
90 Copyright 2002-2013 by Mike Schilli <m@perlmeister.com> and Kevin Goess
91 <cpan@goess.org>.
92 This library is free software; you can redistribute it and/or modify it
94 under the same terms as Perl itself.
95
97 Please contribute patches to the project on Github:
98 http://github.com/mschilli/log4perl
100 Send bug reports or requests for enhancements to the authors via our
102 MAILING LIST (questions, bug reports, suggestions/patches):
104 log4perl-devel@lists.sourceforge.net
105 Authors (please contact them via the list above, not directly): Mike
107 Schilli <m@perlmeister.com>, Kevin Goess <cpan@goess.org>
108 Contributors (in alphabetical order): Ateeq Altaf, Cory Bennett, Jens
110 Berthold, Jeremy Bopp, Hutton Davidson, Chris R. Donnelly, Matisse
111 Enzer, Hugh Esco, Anthony Foiani, James FitzGibbon, Carl Franks, Dennis
112 Gregorovic, Andy Grundman, Paul Harrington, Alexander Hartmaier David
113 Hull, Robert Jacobson, Jason Kohles, Jeff Macdonald, Markus Peter,
114 Brett Rann, Peter Rabbitson, Erik Selberg, Aaron Straup Cope, Lars
115 Thegler, David Viner, Mac Yang.
116perl v5.28.0 2017-02-21 Util::TimeTracker(3)