1Appender::Limit(3) User Contributed Perl Documentation Appender::Limit(3)
2
6 Log::Log4perl::Appender::Limit - Limit message delivery via block period
7
9 use Log::Log4perl qw(:easy);
10 my $conf = qq(
12 log4perl.category = WARN, Limiter
13 # Email appender
15 log4perl.appender.Mailer = Log::Dispatch::Email::MailSend
16 log4perl.appender.Mailer.to = drone\@pageme.com
17 log4perl.appender.Mailer.subject = Something's broken!
18 log4perl.appender.Mailer.buffered = 0
19 log4perl.appender.Mailer.layout = PatternLayout
20 log4perl.appender.Mailer.layout.ConversionPattern=%d %m %n
21 # Limiting appender, using the email appender above
23 log4perl.appender.Limiter = Log::Log4perl::Appender::Limit
24 log4perl.appender.Limiter.appender = Mailer
25 log4perl.appender.Limiter.block_period = 3600
26 );
27 Log::Log4perl->init(\$conf);
29 WARN("This message will be sent immediately.");
30 WARN("This message will be delayed by one hour.");
31 sleep(3601);
32 WARN("This message plus the last one will be sent now, seperately.");
33
35 "appender"
36 Specifies the name of the appender used by the limiter. The
37 appender specified must be defined somewhere in the configuration
38 file, not necessarily before the definition of
39 "Log::Log4perl::Appender::Limit".
40 "block_period"
42 Period in seconds between delivery of messages. If messages arrive
43 in between, they will be either saved (if "accumulate" is set to a
44 true value) or discarded (if "accumulate" isn't set).
45 "persistent"
47 File name in which "Log::Log4perl::Appender::Limit" persistently
48 stores delivery times. If omitted, the appender will have no
49 recollection of what happened when the program restarts.
50 "max_until_flushed"
52 Maximum number of accumulated messages. If exceeded, the appender
53 flushes all messages, regardless if the interval set in
54 "block_period" has passed or not. Don't mix with
55 "max_until_discarded".
56 "max_until_discarded"
58 Maximum number of accumulated messages. If exceeded, the appender
59 will simply discard additional messages, waiting for "block_period"
60 to expire to flush all accumulated messages. Don't mix with
61 "max_until_flushed".
62 "appender_method_on_flush"
64 Optional method name to be called on the appender attached to the
65 limiter when messages are flushed. For example, to have the sample
66 code in the SYNOPSIS section bundle buffered emails into one,
67 change the mailer's "buffered" parameter to 1 and set the limiters
68 "appender_method_on_flush" value to the string "flush":
69 log4perl.category = WARN, Limiter
71 # Email appender
73 log4perl.appender.Mailer = Log::Dispatch::Email::MailSend
74 log4perl.appender.Mailer.to = drone\@pageme.com
75 log4perl.appender.Mailer.subject = Something's broken!
76 log4perl.appender.Mailer.buffered = 1
77 log4perl.appender.Mailer.layout = PatternLayout
78 log4perl.appender.Mailer.layout.ConversionPattern=%d %m %n
79 # Limiting appender, using the email appender above
81 log4perl.appender.Limiter = Log::Log4perl::Appender::Limit
82 log4perl.appender.Limiter.appender = Mailer
83 log4perl.appender.Limiter.block_period = 3600
84 log4perl.appender.Limiter.appender_method_on_flush = flush
85 This will cause the mailer to buffer messages and wait for
87 "flush()" to send out the whole batch. The limiter will then call
88 the appender's "flush()" method when it's own buffer gets flushed
89 out.
90 If the appender attached to "Limit" uses "PatternLayout" with a
92 timestamp specifier, you will notice that the message timestamps are
93 reflecting the original log event, not the time of the message
94 rendering in the attached appender. Major trickery has been applied to
95 accomplish this (Cough!).
96
98 "Log::Log4perl::Appender::Limit" is a composite appender. Unlike other
99 appenders, it doesn't log any messages, it just passes them on to its
100 attached sub-appender. For this reason, it doesn't need a layout
101 (contrary to regular appenders). If it defines none, messages are
102 passed on unaltered.
103 Custom filters are also applied to the composite appender only. They
105 are not applied to the sub-appender. Same applies to appender
106 thresholds. This behaviour might change in the future.
107
109 Copyright 2002-2013 by Mike Schilli <m@perlmeister.com> and Kevin Goess
110 <cpan@goess.org>.
111 This library is free software; you can redistribute it and/or modify it
113 under the same terms as Perl itself.
114
116 Please contribute patches to the project on Github:
117 http://github.com/mschilli/log4perl
119 Send bug reports or requests for enhancements to the authors via our
121 MAILING LIST (questions, bug reports, suggestions/patches):
123 log4perl-devel@lists.sourceforge.net
124 Authors (please contact them via the list above, not directly): Mike
126 Schilli <m@perlmeister.com>, Kevin Goess <cpan@goess.org>
127 Contributors (in alphabetical order): Ateeq Altaf, Cory Bennett, Jens
129 Berthold, Jeremy Bopp, Hutton Davidson, Chris R. Donnelly, Matisse
130 Enzer, Hugh Esco, Anthony Foiani, James FitzGibbon, Carl Franks, Dennis
131 Gregorovic, Andy Grundman, Paul Harrington, Alexander Hartmaier David
132 Hull, Robert Jacobson, Jason Kohles, Jeff Macdonald, Markus Peter,
133 Brett Rann, Peter Rabbitson, Erik Selberg, Aaron Straup Cope, Lars
134 Thegler, David Viner, Mac Yang.
135perl v5.30.0 2019-07-26 Appender::Limit(3)