MDC(3pm) User Contributed Perl Documentation MDC(3pm) NAME Log::Log4perl::MDC - Mapped Diagnostic Context DESCRIPTION Log::Log4perl allows loggers to maintain global thread-specific data, called the Nested Diagnostic Context (NDC) and Mapped Diagnostic Context (MDC). The MDC is a simple thread-specific hash table, in which the application can stuff values under certain keys and retrieve them later via the "%X{key}" placeholder in "Log::Log4perl::Layout::PatternLayout"s. Log::Log4perl::MDC->put($key, $value); Store a value $value under key $key in the map. my $value = Log::Log4perl::MDC->get($key); Retrieve the content of the map under the specified key. Typically done by %X{key} in "Log::Log4perl::Layout::PatternLayout". If no value exists to the given key, "undef" is returned. my $text = Log::Log4perl::MDC->remove(); Delete all entries from the map. Log::Log4perl::MDC->get_context(); Returns a reference to the hash table. Please note that all of the methods above are class methods, there's no instances of this class. Since the thread model in perl 5.8.0 is "no shared data unless explicitly requested" the data structures used are just global (and therefore thread-specific). 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 MDC(3pm)
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