liblog-log4perl-perl 1.29-1ubuntu1 / usr / share / perl5 / Log / Log4perl / JavaMap.pm

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package Log::Log4perl::JavaMap;

use Carp;
use strict;

use constant _INTERNAL_DEBUG => 0;

our %translate = (
    'org.apache.log4j.ConsoleAppender' => 
        'Log::Log4perl::JavaMap::ConsoleAppender',
    'org.apache.log4j.FileAppender'    => 
        'Log::Log4perl::JavaMap::FileAppender',
    'org.apache.log4j.RollingFileAppender'    => 
        'Log::Log4perl::JavaMap::RollingFileAppender',
    'org.apache.log4j.TestBuffer'    => 
        'Log::Log4perl::JavaMap::TestBuffer',
     'org.apache.log4j.jdbc.JDBCAppender'    => 
        'Log::Log4perl::JavaMap::JDBCAppender',
     'org.apache.log4j.SyslogAppender'    => 
        'Log::Log4perl::JavaMap::SyslogAppender',
     'org.apache.log4j.NTEventLogAppender'    => 
        'Log::Log4perl::JavaMap::NTEventLogAppender',
);

our %user_defined;

sub get {
    my ($appender_name, $appender_data) = @_;

    print "Trying to map $appender_name\n" if _INTERNAL_DEBUG;

    $appender_data->{value} ||
            die "ERROR: you didn't tell me how to implement your appender " .
                "'$appender_name'";

    my $perl_class = $translate{$appender_data->{value}} || 
                     $user_defined{$appender_data->{value}} ||
            die "ERROR:  I don't know how to make a '$appender_data->{value}' " .
                "to implement your appender '$appender_name', that's not a " .
                "supported class\n";
    eval {
        eval "require $perl_class";  #see 'perldoc -f require' for why two evals
        die $@ if $@;
    };
    $@ and die "ERROR: trying to set appender for $appender_name to " .
               "$appender_data->{value} using $perl_class failed\n$@  \n";

    my $app = $perl_class->new($appender_name, $appender_data);
    return $app;
}

#an external api to the two hashes
sub translate {
    my $java_class = shift;

    return $translate{$java_class} || 
            $user_defined{$java_class};
}

1;


=head1 NAME

Log::Log4perl::JavaMap - maps java log4j appenders to Log::Dispatch classes

=head1 SYNOPSIS

     ###############################
     log4j.appender.FileAppndr1        = org.apache.log4j.FileAppender
     log4j.appender.FileAppndr1.File   = /var/log/onetime.log
     log4j.appender.FileAppndr1.Append = false

     log4j.appender.FileAppndr1.layout = org.apache.log4j.PatternLayout
     log4j.appender.FileAppndr1.layout.ConversionPattern=%d %4r [%t] %-5p %c %x - %m%n
     ###############################


=head1 DESCRIPTION

If somebody wants to create an appender called C<org.apache.log4j.ConsoleAppender>,
we want to translate it to Log::Dispatch::Screen, and then translate
the log4j options into Log::Dispatch parameters..

=head2 What's Implemented

(Note that you can always use the Log::Dispatch::* module.  By 'implemented'
I mean having a translation class that translates log4j options into
the Log::Dispatch options so you can use log4j rather than log4perl 
syntax in your config file.)

Here's the list of appenders I see on the current (6/2002) log4j site.

These are implemented

    ConsoleAppender     - Log::Dispatch::Screen
    FileAppender        - Log::Dispatch::File
    RollingFileAppender - Log::Dispatch::FileRotate (by Mark Pfeiffer)
    JDBCAppender        - Log::Log4perl::Appender::DBI
    SyslogAppender      - Log::Dispatch::Syslog
    NTEventLogAppender  - Log::Dispatch::Win32EventLog


These should/will/might be implemented
    
    DailyRollingFileAppender - 
    SMTPAppender     - Log::Dispatch::Email::MailSender
    

These might be implemented but they don't have corresponding classes
in Log::Dispatch (yet):

    NullAppender
    TelnetAppender

These might be simulated

    LF5Appender - use Tk?
    ExternallyRolledFileAppender - catch a HUP instead?

These will probably not be implemented

    AsyncAppender
    JMSAppender
    SocketAppender - (ships a serialized LoggingEvent to the server side)
    SocketHubAppender

=head1 ROLL YOUR OWN

Let's say you've in a mixed Java/Perl enviroment and you've
come up with some custom Java appender with behavior you want to 
use in both worlds, C<myorg.customAppender>.  You write a
Perl appender with the same behavior C<Myorg::CustomAppender>. You
want to use one config file accross both applications, so the
config file will have to say 'myorg.customAppender'.  But
the mapping from C<myorg.customAppender> to C<Myorg::CustomAppender>
isn't in this JavaMap class, so what do you do?

In  your Perl code, before you call Log::Log4perl::init(), do this:

    $Log::Log4perl::JavaMap::user_defined{'myorg.customAppender'} = 
        'Myorg::CustomAppender';

and you can use 'myorg.customAppender' in your config file with
impunity.

=head1 SEE ALSO

http://jakarta.apache.org/log4j/docs/

=head1 COPYRIGHT AND LICENSE

Copyright 2002-2009 by Mike Schilli E<lt>m@perlmeister.comE<gt> 
and Kevin Goess E<lt>cpan@goess.orgE<gt>.

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

=cut

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