1Agent::Channel(3)     User Contributed Perl Documentation    Agent::Channel(3)
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NAME

6       Log::Agent::Channel - ancestor class for all Log::Agent channels
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SYNOPSIS

9        @Log::Agent::Channel::XXX::ISA = qw(Log::Agent::Channel);
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DESCRIPTION

12       The "Log::Agent::Channel" class is the root class from which all
13       "Log::Agent" channels inherit. It is a deferred class, meaning that it
14       cannot be instantiated directly. All the deferred routines need to be
15       implemented by its heirs to form a valid driver.
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17       Internally, the various "Log::Agent::Driver" objects create
18       "Log::Agent::Channel" instances for each logging channel defined at
19       driver creation time.  The channels are therefore architecturally
20       hidden within "Log::Agent", since this module only provides redefined
21       mappings for the various logxxx() routines (logerr(), logwarn(),
22       logdie(), etc...).
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24       However, this does not mean that channel classes cannot be used
25       externally: the "Log::Agent::Logger" extension makes
26       "Log::Agent::Channel" objects architecturally visible, thereby offering
27       an application-level logging API that can be redirected to various
28       places transparently for the application.
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CHANNEL LIST

31       The following channels are currently made available by "Log::Agent".
32       More channels can be defined by the "Log::Agent::Logger" extension:
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34       Log::Agent::Channel::File
35           This channel writes logs to files, defined by their path or via a
36           magical opening sequence such as "|cmd".  See
37           Log::Agent::Channel::File.
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39       Log::Agent::Channel::Handle
40           This channel writes logs to an already opened descriptor, as
41           specified by its file handle: an IO::Handle object, or a GLOB
42           reference such as \*FILE.  See Log::Agent::Channel::Handle.
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44       Log::Agent::Channel::Syslog
45           This channel redirects logs to the syslogd(8) daemon, which will
46           then handle the dispatching to various logfiles, based on its own
47           configuration.  See Log::Agent::Channel::Syslog.
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INTERFACE

50       You need not read this section if you're only using "Log::Agent".
51       However, if you wish to implement another channel, then this section
52       might be of interest.
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54       The following routines are deferred and therefore need to be defined by
55       the heir:
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57       write($priority, $logstring)
58           Emit the log entry held in $logstring, at priority $priority.  A
59           trailing "\n" is added to the $logstring, if needed (i.e. if the
60           physical entity does not do it already, like syslog does).
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62           The $priority argument must be a valid syslog priority, i.e. one of
63           the following strings: "emerg", "alert", "crit", "err", "warning",
64           "notice", "info", "debug".
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66           The $logstring may not really be a plain string. It can actually be
67           a Log::Agent::Message object with an overloaded stringification
68           routine, so the illusion should be complete.
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70       close
71           Close the channel.
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73       make
74           This is the creation routine. Its signature varies for each
75           channel, naturally.
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AUTHOR

78       Raphael Manfredi <Raphael_Manfredi@pobox.com>
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SEE ALSO

81       Log::Agent::Channel::File(3), Log::Agent::Channel::Handle(3),
82       Log::Agent::Channel::Syslog(3), Log::Agent::Logger(3).
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86perl v5.30.1                      2020-01-30                 Agent::Channel(3)