1Appender::Limit(3)    User Contributed Perl Documentation   Appender::Limit(3)
2
3
4

NAME

6       Log::Log4perl::Appender::Limit - Limit message delivery via block
7       period
8

SYNOPSIS

10           use Log::Log4perl qw(:easy);
11
12           my $conf = qq(
13             log4perl.category = WARN, Limiter
14
15                 # Email appender
16             log4perl.appender.Mailer          = Log::Dispatch::Email::MailSend
17             log4perl.appender.Mailer.to       = drone\@pageme.com
18             log4perl.appender.Mailer.subject  = Something's broken!
19             log4perl.appender.Mailer.buffered = 0
20             log4perl.appender.Mailer.layout   = PatternLayout
21             log4perl.appender.Mailer.layout.ConversionPattern=%d %m %n
22
23                 # Limiting appender, using the email appender above
24             log4perl.appender.Limiter              = Log::Log4perl::Appender::Limit
25             log4perl.appender.Limiter.appender     = Mailer
26             log4perl.appender.Limiter.block_period = 3600
27           );
28
29           Log::Log4perl->init(\$conf);
30           WARN("This message will be sent immediately.");
31           WARN("This message will be delayed by one hour.");
32           sleep(3601);
33           WARN("This message plus the last one will be sent now, seperately.");
34

DESCRIPTION

36       "appender"
37           Specifies the name of the appender used by the limiter. The
38           appender specified must be defined somewhere in the configuration
39           file, not necessarily before the definition of
40           "Log::Log4perl::Appender::Limit".
41
42       "block_period"
43           Period in seconds between delivery of messages. If messages arrive
44           in between, they will be either saved (if "accumulate" is set to a
45           true value) or discarded (if "accumulate" isn't set).
46
47       "persistent"
48           File name in which "Log::Log4perl::Appender::Limit" persistently
49           stores delivery times. If omitted, the appender will have no
50           recollection of what happened when the program restarts.
51
52       "max_until_flushed"
53           Maximum number of accumulated messages. If exceeded, the appender
54           flushes all messages, regardless if the interval set in
55           "block_period" has passed or not. Don't mix with
56           "max_until_discarded".
57
58       "max_until_discarded"
59           Maximum number of accumulated messages. If exceeded, the appender
60           will simply discard additional messages, waiting for "block_period"
61           to expire to flush all accumulated messages. Don't mix with
62           "max_until_flushed".
63
64       "appender_method_on_flush"
65           Optional method name to be called on the appender attached to the
66           limiter when messages are flushed. For example, to have the sample
67           code in the SYNOPSIS section bundle buffered emails into one,
68           change the mailer's "buffered" parameter to 1 and set the limiters
69           "appender_method_on_flush" value to the string "flush":
70
71                 log4perl.category = WARN, Limiter
72
73                     # Email appender
74                 log4perl.appender.Mailer          = Log::Dispatch::Email::MailSend
75                 log4perl.appender.Mailer.to       = drone\@pageme.com
76                 log4perl.appender.Mailer.subject  = Something's broken!
77                 log4perl.appender.Mailer.buffered = 1
78                 log4perl.appender.Mailer.layout   = PatternLayout
79                 log4perl.appender.Mailer.layout.ConversionPattern=%d %m %n
80
81                     # Limiting appender, using the email appender above
82                 log4perl.appender.Limiter              = Log::Log4perl::Appender::Limit
83                 log4perl.appender.Limiter.appender     = Mailer
84                 log4perl.appender.Limiter.block_period = 3600
85                 log4perl.appender.Limiter.appender_method_on_flush = flush
86
87           This will cause the mailer to buffer messages and wait for
88           "flush()" to send out the whole batch. The limiter will then call
89           the appender's "flush()" method when it's own buffer gets flushed
90           out.
91
92       If the appender attached to "Limit" uses "PatternLayout" with a
93       timestamp specifier, you will notice that the message timestamps are
94       reflecting the original log event, not the time of the message
95       rendering in the attached appender. Major trickery has been applied to
96       accomplish this (Cough!).
97

DEVELOPMENT NOTES

99       "Log::Log4perl::Appender::Limit" is a composite appender.  Unlike other
100       appenders, it doesn't log any messages, it just passes them on to its
101       attached sub-appender.  For this reason, it doesn't need a layout
102       (contrary to regular appenders).  If it defines none, messages are
103       passed on unaltered.
104
105       Custom filters are also applied to the composite appender only.  They
106       are not applied to the sub-appender. Same applies to appender
107       thresholds. This behaviour might change in the future.
108

LICENSE

110       Copyright 2002-2013 by Mike Schilli <m@perlmeister.com> and Kevin Goess
111       <cpan@goess.org>.
112
113       This library is free software; you can redistribute it and/or modify it
114       under the same terms as Perl itself.
115

AUTHOR

117       Please contribute patches to the project on Github:
118
119           http://github.com/mschilli/log4perl
120
121       Send bug reports or requests for enhancements to the authors via our
122
123       MAILING LIST (questions, bug reports, suggestions/patches):
124       log4perl-devel@lists.sourceforge.net
125
126       Authors (please contact them via the list above, not directly): Mike
127       Schilli <m@perlmeister.com>, Kevin Goess <cpan@goess.org>
128
129       Contributors (in alphabetical order): Ateeq Altaf, Cory Bennett, Jens
130       Berthold, Jeremy Bopp, Hutton Davidson, Chris R. Donnelly, Matisse
131       Enzer, Hugh Esco, Anthony Foiani, James FitzGibbon, Carl Franks, Dennis
132       Gregorovic, Andy Grundman, Paul Harrington, Alexander Hartmaier  David
133       Hull, Robert Jacobson, Jason Kohles, Jeff Macdonald, Markus Peter,
134       Brett Rann, Peter Rabbitson, Erik Selberg, Aaron Straup Cope, Lars
135       Thegler, David Viner, Mac Yang.
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139perl v5.34.0                      2022-01-21                Appender::Limit(3)
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