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Log::Dispatch::Output(3pm) User Contributed Perl Documentation Log::Dispatch::Output(3pm)
NAME
Log::Dispatch::Output - Base class for all Log::Dispatch::* object
SYNOPSIS
package Log::Dispatch::MySubclass;
use Log::Dispatch::Output;
use base qw( Log::Dispatch::Output );
sub new
{
my $proto = shift;
my $class = ref $proto || $proto;
my %p = @_;
my $self = bless {}, $class
$self->_basic_init(%p);
# Do more if you like
}
sub log_message
{
my $self = shift;
my %p = @_;
# Do something with message in $p{message}
}
DESCRIPTION
This module is the base class from which all Log::Dispatch::* objects should be derived.
METHODS
* new(%p)
This must be overridden in a subclass. Takes the following parameters:
* name ($)
The name of the object (not the filename!). Required.
* min_level ($)
The minimum logging level this object will accept. See the Log::Dispatch documen-
tation on Log Levels for more information. Required.
* max_level ($)
The maximum logging level this obejct will accept. See the Log::Dispatch documen-
tation on Log Levels for more information. This is not required. By default the
maximum is the highest possible level (which means functionally that the object
has no maximum).
* callbacks( \& or [ \&, \&, ... ] )
This parameter may be a single subroutine reference or an array reference of sub-
routine references. These callbacks will be called in the order they are given
and passed a hash containing the following keys:
( message => $log_message, level => $log_level )
The callbacks are expected to modify the message and then return a single scalar
containing that modified message. These callbacks will be called when either the
"log" or "log_to" methods are called and will only be applied to a given message
once. If they do not return the message then you will get no output. Make sure
to return the message!
* _basic_init(%p)
This should be called from a subclass's constructor. Make sure to pass the arguments
in @_ to it. It sets the object's name and minimum level. It also sets up two other
attributes which are used by other Log::Dispatch::Output methods, level_names and
level_numbers.
* name
Returns the object's name.
* min_level
Returns the object's minimum log level.
* max_level
Returns the object's maximum log level.
* accepted_levels
Returns a list of the object's accepted levels (by name) from minimum to maximum.
* log( level => $, message => $ )
Sends a message if the level is greater than or equal to the object's minimum level.
This method applies any message formatting callbacks that the object may have.
* _should_log ($)
This method is called from the "log()" method with the log level of the message to be
logged as an argument. It returns a boolean value indicating whether or not the mes-
sage should be logged by this particular object. The "log()" method will not process
the message if the return value is false.
* _level_as_number ($)
This method will take a log level as a string (or a number) and return the number of
that log level. If not given an argument, it returns the calling object's log level
instead. If it cannot determine the level then it will issue a warning and return
undef.
Subclassing
This class should be used as the base class for all logging objects you create that you
would like to work under the Log::Dispatch architecture. Subclassing is fairly trivial.
For most subclasses, if you simply copy the code in the SYNOPSIS and then put some func-
tionality into the "log_message" method then you should be all set. Please make sure to
use the "_basic_init" method as directed.
AUTHOR
Dave Rolsky, <autarch AT urth.org>
perl v5.8.8 2007-11-01 Log::Dispatch::Output(3pm)
Generated by $Id: phpMan.php,v 4.49 2006/02/26 13:18:18 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2012-05-24 15:47 @38.107.179.238 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)