Jonathan Swartz > Poet > Poet::Log

Download:
Poet-0.15.tar.gz

Dependencies

Annotate this POD

CPAN RT

New  4
Open  2
View/Report Bugs
Module Version: 0.15   Source  

NAME ^

Poet::Log -- Poet logging

SYNOPSIS ^

    # In a conf file...
    log:
      defaults:
        level: info
        output: poet.log
        layout: "%d{dd/MMM/yyyy:HH:mm:ss.SS} [%p] %c - %m - %F:%L - %P%n"
      class:
        CHI:
          level: debug
          output: chi.log
          layout: "%d{dd/MMM/yyyy:HH:mm:ss.SS} %m - %P%n"
        MyApp::Foo:
          output: stdout

    # In a script...
    use Poet::Script qw($log);

    # In a module...
    use Poet qw($log);

    # In a component...
    my $log = $m->log;

    # For an arbitrary category...
    my $log = Poet::Log->get_logger(category => 'MyApp::Bar');

    # then...
    $log->error("an error occurred");

    $log->debugf("arguments are: %s", \@_)
        if $log->is_debug();

DESCRIPTION ^

Poet uses Log::Any and Log::Log4perl for logging, with simplified configuration for the common case.

Log::Any is a logging abstraction that allows CPAN modules to log without knowing about which logging framework is in use. It supports standard logging methods ($log->debug, $log->is_debug) along with sprintf variants ($log->debugf).

Log4perl is a powerful logging package that provides just about any logging-related feature you'd want. One of its only drawbacks is its somewhat cumbersome configuration. So, we provide a way to configure Log4perl simply through Poet configuration if you just want common features.

Note: Log4perl is not a strict dependency for Poet. Log messages will simply not get logged until you install it or until you modify logging for your app.

CONFIGURATION ^

The configurations below can go in any Poet conf file, e.g. local.cfg or global/log.cfg.

Here's a simple configuration that caches everything to logs/poet.log at info level. This is also the default if no configuration is present.

    log:
      defaults:
        level: info
        output: poet.log
        layout: %d{dd/MMM/yyyy:HH:mm:ss.SS} [%p] %c - %m - %F:%L - %P%n

Here's a more involved configuration that maintains the same default, but adds several categories that are logged differently:

    log:
      defaults:
        level: info
        output: poet.log
        layout: "%d{dd/MMM/yyyy:HH:mm:ss.SS} [%p] %c - %m - %F:%L - %P%n"
      category:
        CHI:
          level: debug
          output: chi.log
          layout: "%d{dd/MMM/yyyy:HH:mm:ss.SS} %m - %P%n"
        MyApp::Foo:
          output: stdout

For the default and for each category, you can specify three different settings:

If a setting isn't defined for a specific category then it falls back to the default. In this example, MyApp::Foo will inherit the default level and layout.

Notice that we use '::' instead of '.' to specify hierarchical category names, because '.' would interfere with Poet::Conf dot notation.

Finally, if you must use a full Log4perl configuration file, you can specify it this way:

    log:
      log4perl_conf: /path/to/log4perl.conf

USAGE ^

Obtaining log handle

Using log handle

    $log->error("an error occurred");

    $log->debugf("arguments are: %s", \@_)
        if $log->is_debug();

See Log::Any|Log::Any for more details.

MODIFIABLE METHODS ^

These methods are not intended to be called externally, but may be useful to override or modify with method modifiers in subclasses. Their APIs will be kept as stable as possible.

initialize_logging

Called once when the Poet environment is initialized. By default, initializes log4perl with the results of "generate_log4perl_config" and then calls Log::Any::Adapter->set('Log4perl'). You can modify this to initialize log4perl in your own way, or use a different Log::Any adapter, or use a completely different logging system.

generate_log4perl_config

Returns a log4perl config string based on Poet configuration. You can modify this to construct and return your own config.

SEE ALSO ^

Poet

AUTHOR ^

Jonathan Swartz <swartz@pobox.com>

COPYRIGHT AND LICENSE ^

This software is copyright (c) 2012 by Jonathan Swartz.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

syntax highlighting: