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Log::Agent::Channel.3pm
Langue: en
Version: 2002-03-09 (mandriva - 01/05/08)
Section: 3 (Bibliothèques de fonctions)
NAME
Log::Agent::Channel - ancestor class for all Log::Agent channelsSYNOPSIS
@Log::Agent::Channel::XXX::ISA = qw(Log::Agent::Channel);
DESCRIPTION
The "Log::Agent::Channel" class is the root class from which all "Log::Agent" channels inherit. It is a deferred class, meaning that it cannot be instantiated directly. All the deferred routines need to be implemented by its heirs to form a valid driver.Internally, the various "Log::Agent::Driver" objects create "Log::Agent::Channel" instances for each logging channel defined at driver creation time. The channels are therefore architecturally hidden within "Log::Agent", since this module only provides redefined mappings for the various logxxx() routines (logerr(), logwarn(), logdie(), etc...).
However, this does not mean that channel classes cannot be used externally: the "Log::Agent::Logger" extension makes "Log::Agent::Channel" objects architecturally visible, thereby offering an application-level logging API that can be redirected to various places transparently for the application.
CHANNEL LIST
The following channels are currently made available by "Log::Agent". More channels can be defined by the "Log::Agent::Logger" extension:- Log::Agent::Channel::File
- This channel writes logs to files, defined by their path or via a magical opening sequence such as ``|cmd''. See Log::Agent::Channel::File.
- Log::Agent::Channel::Handle
- This channel writes logs to an already opened descriptor, as specified by its file handle: an IO::Handle object, or a GLOB reference such as \*FILE. See Log::Agent::Channel::Handle.
- Log::Agent::Channel::Syslog
- This channel redirects logs to the syslogd(8) daemon, which will then handle the dispatching to various logfiles, based on its own configuration. See Log::Agent::Channel::Syslog.
INTERFACE
You need not read this section if you're only using "Log::Agent". However, if you wish to implement another channel, then this section might be of interest.The following routines are deferred and therefore need to be defined by the heir:
- write($priority, $logstring)
- Emit the log entry held in $logstring, at priority $priority. A trailing ``\n'' is added to the $logstring, if needed (i.e. if the physical entity does not do it already, like syslog does).
The $priority argument must be a valid syslog priority, i.e. one of the following strings: ``emerg'', ``alert'', ``crit'', ``err'', ``warning'', ``notice'', ``info'', ``debug''.
The $logstring may not really be a plain string. It can actually be a Log::Agent::Message object with an overloaded stringification routine, so the illusion should be complete.
- close
- Close the channel.
- make
- This is the creation routine. Its signature varies for each channel, naturally.
AUTHOR
Raphael Manfredi <Raphael_Manfredi@pobox.com>SEE ALSO
Log::Agent::Channel::File(3), Log::Agent::Channel::Handle(3), Log::Agent::Channel::Syslog(3), Log::Agent::Logger(3).Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre