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Appender::Limit(3pm) User Contributed Perl Documentation Appender::Limit(3pm)
NAME
Log::Log4perl::Appender::Limit - Limit message delivery via block period
SYNOPSIS
use Log::Log4perl qw(:easy);
my $conf = qq(
log4perl.category = WARN, Limiter
# Email appender
log4perl.appender.Mailer = Log::Dispatch::Email::MailSend
log4perl.appender.Mailer.to = drone\@pageme.com
log4perl.appender.Mailer.subject = Something's broken!
log4perl.appender.Mailer.buffered = 0
log4perl.appender.Mailer.layout = PatternLayout
log4perl.appender.Mailer.layout.ConversionPattern=%d %m %n
# Limiting appender, using the email appender above
log4perl.appender.Limiter = Log::Log4perl::Appender::Limit
log4perl.appender.Limiter.appender = Mailer
log4perl.appender.Limiter.block_period = 3600
);
Log::Log4perl->init(\$conf);
WARN("This message will be sent immediately.");
WARN("This message will be delayed by one hour.");
sleep(3601);
WARN("This message plus the last one will be sent now, separately.");
DESCRIPTION
"appender"
Specifies the name of the appender used by the limiter. The appender specified must be
defined somewhere in the configuration file, not necessarily before the definition of
"Log::Log4perl::Appender::Limit".
"block_period"
Period in seconds between delivery of messages. If messages arrive in between, they
will be either saved (if "accumulate" is set to a true value) or discarded (if
"accumulate" isn't set).
"persistent"
File name in which "Log::Log4perl::Appender::Limit" persistently stores delivery
times. If omitted, the appender will have no recollection of what happened when the
program restarts.
"max_until_flushed"
Maximum number of accumulated messages. If exceeded, the appender flushes all
messages, regardless if the interval set in "block_period" has passed or not. Don't
mix with "max_until_discarded".
"max_until_discarded"
Maximum number of accumulated messages. If exceeded, the appender will simply discard
additional messages, waiting for "block_period" to expire to flush all accumulated
messages. Don't mix with "max_until_flushed".
"appender_method_on_flush"
Optional method name to be called on the appender attached to the limiter when
messages are flushed. For example, to have the sample code in the SYNOPSIS section
bundle buffered emails into one, change the mailer's "buffered" parameter to 1 and set
the limiters "appender_method_on_flush" value to the string "flush":
log4perl.category = WARN, Limiter
# Email appender
log4perl.appender.Mailer = Log::Dispatch::Email::MailSend
log4perl.appender.Mailer.to = drone\@pageme.com
log4perl.appender.Mailer.subject = Something's broken!
log4perl.appender.Mailer.buffered = 1
log4perl.appender.Mailer.layout = PatternLayout
log4perl.appender.Mailer.layout.ConversionPattern=%d %m %n
# Limiting appender, using the email appender above
log4perl.appender.Limiter = Log::Log4perl::Appender::Limit
log4perl.appender.Limiter.appender = Mailer
log4perl.appender.Limiter.block_period = 3600
log4perl.appender.Limiter.appender_method_on_flush = flush
This will cause the mailer to buffer messages and wait for "flush()" to send out the
whole batch. The limiter will then call the appender's "flush()" method when it's own
buffer gets flushed out.
If the appender attached to "Limit" uses "PatternLayout" with a timestamp specifier, you
will notice that the message timestamps are reflecting the original log event, not the
time of the message rendering in the attached appender. Major trickery has been applied to
accomplish this (Cough!).
DEVELOPMENT NOTES
"Log::Log4perl::Appender::Limit" is a composite appender. Unlike other appenders, it
doesn't log any messages, it just passes them on to its attached sub-appender. For this
reason, it doesn't need a layout (contrary to regular appenders). If it defines none,
messages are passed on unaltered.
Custom filters are also applied to the composite appender only. They are not applied to
the sub-appender. Same applies to appender thresholds. This behaviour might change in the
future.
LICENSE
Copyright 2002-2013 by Mike Schilli <m AT perlmeister.com> and Kevin Goess <cpan AT 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 AT lists.net
Authors (please contact them via the list above, not directly): Mike Schilli
<m AT perlmeister.com>, Kevin Goess <cpan AT 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 v5.32.1 2021-02-14 Appender::Limit(3pm)
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On Apache
Under GNU General Public License
2025-11-21 16:50 @216.73.216.57 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)