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[p5sagit/Log-Contextual.git] / lib / Log / Contextual / TeeLogger.pm

package Log::Contextual::TeeLogger;

use strict;
use warnings;

{
   for my $name (qw( trace debug info warn error fatal )) {

      no strict 'refs';

      *{$name} = sub {
         my $self = shift;

         foreach my $logger (@{$self->{loggers}}) {
            $logger->$name(@_);
         }
      };

      my $is_name = "is_${name}";

      *{$is_name} = sub {
         my $self = shift;
         foreach my $logger (@{$self->{loggers}}) {
            return 1 if $logger->$is_name(@_);
         }
         return 0;
      };
   }
}

sub new {
   my ($class, $args) = @_;
   my $self = bless {}, $class;

   ref($self->{loggers} = $args->{loggers}) eq 'ARRAY'
     or die "No loggers passed to tee logger";

   return $self;
}

1;

__END__

=head1 NAME

Log::Contextual::TeeLogger - Output to more than one logger

=head1 SYNOPSIS

 use Log::Contextual::SimpleLogger;
 use Log::Contextual::TeeLogger;
 use Log::Contextual qw( :log ),
   -logger => Log::Contextual::TeeLogger->new({ loggers => [
     Log::Contextual::SimpleLogger->new({ levels => [ 'debug' ] }),
     Log::Contextual::SimpleLogger->new({
       levels => [ 'info' ],
       coderef => sub { print @_ },
     }),
   ]});

 ## docs below here not yet edited

 log_info { 'program started' }; # no-op because info is not in levels
 sub foo {
   log_debug { 'entered foo' };
   ...
 }

=head1 DESCRIPTION

This module is a simple logger made mostly for demonstration and initial
experimentation with L<Log::Contextual>.  We recommend you use a real logger
instead.  For something more serious but not overly complicated, take a look at
L<Log::Dispatchouli>.

=head1 METHODS

=head2 new

Arguments: C<< Dict[ levels => ArrayRef[Str], coderef => Optional[CodeRef] ] $conf >>

 my $l = Log::Contextual::SimpleLogger->new({
   levels => [qw( info warn )],
   coderef => sub { print @_ }, # the default prints to STDERR
 });

Creates a new SimpleLogger object with the passed levels enabled and optionally
a C<CodeRef> may be passed to modify how the logs are output/stored.

Levels may contain:

 trace
 debug
 info
 warn
 error
 fatal

=head2 $level

Arguments: C<@anything>

All of the following six methods work the same.  The basic pattern is:

 sub $level {
   my $self = shift;

   print STDERR "[$level] " . join qq{\n}, @_;
      if $self->is_$level;
 }

=head3 trace

 $l->trace( 'entered method foo with args ' join q{,}, @args );

=head3 debug

 $l->debug( 'entered method foo' );

=head3 info

 $l->info( 'started process foo' );

=head3 warn

 $l->warn( 'possible misconfiguration at line 10' );

=head3 error

 $l->error( 'non-numeric user input!' );

=head3 fatal

 $l->fatal( '1 is never equal to 0!' );

=head2 is_$level

All of the following six functions just return true if their respective
level is enabled.

=head3 is_trace

 say 'tracing' if $l->is_trace;

=head3 is_debug

 say 'debuging' if $l->is_debug;

=head3 is_info

 say q{info'ing} if $l->is_info;

=head3 is_warn

 say 'warning' if $l->is_warn;

=head3 is_error

 say 'erroring' if $l->is_error;

=head3 is_fatal

 say q{fatal'ing} if $l->is_fatal;

=head1 AUTHOR

See L<Log::Contextual/"AUTHOR">

=head1 COPYRIGHT

See L<Log::Contextual/"COPYRIGHT">

=head1 LICENSE

See L<Log::Contextual/"LICENSE">

=cut