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@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 v5.36.0 2022-10-30 Appender::Limit(3pm)
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