NAME¶
Log::Agent::Tag::Caller - formats caller information
SYNOPSIS¶
Not intended to be used directly
Inherits from Log::Agent::Tag.
DESCRIPTION¶
This class handles caller information for Log::Agent services and is not meant
to be used directly.
This manpage therefore only documents the creation routine parameters that can
be specified at the Log::Agent level via the "-caller" switch in the
logconfig() routine.
This class knows about four entities:
package,
filename,
line and
subroutine, which are to be understood within the
context of the Log::Agent routine being called (e.g. a
logwarn()
routine), namely:
- package
- This is the package name where the call to the
logwarn() routine was made. It can be specified as "pack"
for short, or spelled out completely.
- filename
- This is the file where the call to the logwarn()
routine was made. It can be specified as "file" for short, or
spelled out completely.
- line
- This is the line number where the call to the
logwarn() routine was made, in file filename. The name is
short enough to be spelled out completely.
- subroutine
- This is the subroutine where the call to the
logwarn() routine was made. If the call is made outside a
subroutine, this will be empty. The name is long enough to warrant the
"sub" abbreviation if you don't wish to spell it out fully.
CREATION ROUTINE PARAMETERS¶
The purpose of those parameters is to define how caller information entities (as
defined by the previous section) will be formatted within the log message.
- "-display" => string
- Specifies a string with minimal variable substitution: only
the caller information entities specified above, or their abbreviation,
will be interpolated. For instance:
-display => '($package::$sub/$line)'
Don't forget to use simple quotes to avoid having Perl interpolate those as
variables, or escape their leading "$" sign otherwise. Using
this convention was deemed to more readable (and natural in Perl) than
SGML entities such as "&pack;".
Using this switch supersedes the "-info" and "-format"
switches.
- "-format" => printf format
- Formatting instructions for the caller information entities
listed by the "-info" switch. For instance:
-format => "%s:%4d"
if you have specified two entities in "-info".
The special formatting macro %a stands for all the entities specified by
"-info" and is rendered by a string where values are separated
by ":".
- "-info" => "space separated list of
parameters"
- Specifies a list of caller information entities that are to
be formated using the "-format" specification. For instance:
-info => "pack sub line"
would only report those three entites.
- "-postfix" => flag
- Whether the string resulting from the formatting of the
caller information entities should be appended to the regular log message
or not (i.e. prepended, which is the default).
- "-separator" => string
- The separation string between the tag and the log message.
A single space by default.
AUTHORS¶
Raphael Manfredi <Raphael_Manfredi@pobox.com> created the module, it is
currently maintained by Mark Rogaski <mrogaski@cpan.org>.
Thanks to Jeff Boes for uncovering wackiness in
caller().
LICENSE¶
Copyright (C) 1999 Raphael Manfredi. Copyright (C) 2002 Mark Rogaski; all rights
reserved.
See
Log::Agent(3) or the README file included with the distribution for
license information.
SEE ALSO¶
Log::Agent(3), Log::Agent::
Message(3).