MDC(3)

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 2002-2026 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.