Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Contact Us
Online Help
Domain Status
Man Pages

Virtual Servers

Topology Map

Server Agreement
Year 2038

USA Flag



Man Pages

Manual Reference Pages  -  LOG::LOG4PERL::MDC (3)

.ds Aq ’


Log::Log4perl::MDC - Mapped Diagnostic Context



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::PatternLayouts.
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).


Copyright 2002-2013 by Mike Schilli <> and Kevin Goess <>.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.


Please contribute patches to the project on Github:

Send bug reports or requests for enhancements to the authors via our

MAILING LIST (questions, bug reports, suggestions/patches):

Authors (please contact them via the list above, not directly): Mike Schilli <>, Kevin Goess <>

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.

Search for    or go to Top of page |  Section 3 |  Main Index

perl v5.20.3 MDC (3) 2015-04-18

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.