cpan/Class/Logger.pm

## ------------------------------------------------------------------------
##  $Id: Logger.pm,v 1.6 2003/06/06 03:19:09 joko Exp $
## ------------------------------------------------------------------------
##  $Log: Logger.pm,v $
##
## ------------------------------------------------------------------------


=pod

  This is weird! Forget it.
  But we depend on it!
  Hmmm....


=cut


package Class::Logger;

use strict;
use warnings;

use Data::Dumper;
use Log::Dispatch;
use Log::Dispatch::Screen;
use Log::Dispatch::Config;
use Cwd;
use DesignPattern::Object;
use base qw/Exporter/;
use vars qw(
  $LEVEL_DEFAULT
  $ENABLE_NAMESPACE
  $NAMESPACE_LEVEL
  $ENABLE_METHODS
  $METHOD_LEVELS
  $TRACE_STACK_LEVELS
        $loggerai @EXPORT
);
@EXPORT = qw($logger);

# default behaviour
$LEVEL_DEFAULT = 'debug';
$ENABLE_NAMESPACE = 1;
$NAMESPACE_LEVEL = undef;
$ENABLE_METHODS = 0;
$METHOD_LEVELS = [3];
$TRACE_STACK_LEVELS = [];


# TODO: review, revise and rewire this!
#my $logger = Log::Dispatch::Config->instance;

sub __init {
  my $self = shift;
  my $action = shift;
  my $message = shift;
  #my $options = shift;   # ??? or: $self->{__logger}->{options} already...?

  # configure
  if (!$self->{__logger}->{configured}) {
    $self->{__logger}->{configured} = 1;
    $self->_configure_LogDispatch();
  }
  
  # set passed-in arguments
  $self->{__logger}->{action} = $action;
  $self->{__logger}->{message} = $message;

  # trace
    #my $tmp = caller(2);
    #print Dumper($tmp);
    #exit;
  

  # handle caller

    # determine class- and subroutinename of context calling us
    # this task can be controlled by tuning its behaviour
    # this can be changed by setting
    #   Class::Logger::...
    #   ...
    #   ...
    my $calling_class;
    my $calling_sub;


    # Default behaviour is:
    #   Use classname from $self and suppress subroutine name.
    #   In case of using this together with DesignPattern::Bridge,
    #   the classnames of child objects are suppressed.
    #   Instead, the classname of the parent container object
    #   gets used *always*.
      $calling_class = '';
      $calling_sub = '';

      # Log class names (en-/disabled, take from specified level)
      if ($ENABLE_NAMESPACE) {
        $calling_class = ref $self;
        if ($NAMESPACE_LEVEL) {
          my @entry = caller($NAMESPACE_LEVEL);
          $calling_class = $entry[0];
        }
      }

      # Log method names (en-/disabled, multi-level)
      if ($ENABLE_METHODS) {
        my @methods;
        foreach (@{$METHOD_LEVELS}) {
          (my $c_package, my $c_filename, my $c_line, my $c_subroutine, my $c_hasargs,
          my $c_wantarray, my $c_evaltext, my $c_is_require, my $c_hints, my $c_bitmask) = caller($_);
          $c_subroutine ||= '';
          $c_subroutine =~ s/.*:://;
          push @methods, $c_subroutine;
        }
        $calling_sub = join(': ', @methods) if @methods;
      }
  
    
  # set default arguments
  $self->{__logger}->{classname} = $calling_class;
  $self->{__logger}->{functionname} = $calling_sub;
  # FIXME: deprecate this!
  $self->{__logger}->{caller} = caller;
  
  # set default values
  $self->{__logger}->{action} ||= '';
  $self->{__logger}->{options}->{tag} ||= '';
  
  # FIXME: deprecate this!
  #$self->{__logger}->{level} ||= 'info';
  #$self->{__logger}->{level} ||= 'debug';
  $self->{__logger}->{level} ||= $LEVEL_DEFAULT;

  # handle stacktrace
    foreach (@$TRACE_STACK_LEVELS) {
      #print "trace-level: ", $_, "\n";
      #(my $c_package, my $c_filename, my $c_line, my $c_subroutine, my $c_hasargs,
      #my $c_wantarray, my $c_evaltext, my $c_is_require, my $c_hints, my $c_bitmask) = caller($_);
      my @entry = caller($_);
      push @{$self->{__logger}->{trace}->{stack}}, \@entry;
    }
  
}

sub __out {
  my $self = shift;
  my $message = shift;
  
  # if message given here, append to message stored inside object
  $self->{__logger}->{message} .= ' - ' . $message if $message;
  
  # TODO: refactor this:
  #  - push '$self->__get_prefix()' to additional log-entry-metadata, don't show it on/in any console/logfile output
  #$logger->log( level => $self->{__logger}->{level}, message => $self->__get_prefix_long() . $message );
  #$logger->log( level => $self->{__logger}->{level}, message => $message );
  #$logger->warning( __PACKAGE__ . "->_skip: '$caller' (mixed into '$classname'): ($options->{tag}) $message.");
  #$self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $self->__get_prefix_short() . $self->{__logger}->{message} );
  #$self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $self->__get_prefix_module() . $self->{__logger}->{message} );
  $self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $self->__get_prefix_best() . $self->{__logger}->{message} );
}


sub __handle_options {
  my $self = shift;
  #my $options = shift;   # ??? or: $self->{__logger}->{options} already...?
}

sub __get_prefix_long {
  my $self = shift;
  return __PACKAGE__ . "->$self->{__logger}->{action}: '$self->{__logger}->{caller}' (mixed into '$self->{__logger}->{classname}'): ($self->{__logger}->{options}->{tag}) - ";
}

sub __get_prefix_short {
  my $self = shift;
  my $tag_append = '';
  $tag_append = "$self->{__logger}->{options}->{tag} - " if $self->{__logger}->{options}->{tag};
  return $self->{__logger}->{classname} . "->$self->{__logger}->{action}: $tag_append";
}

sub __get_prefix_module {
  my $self = shift;
  my $tag_append = '';
  $tag_append = "$self->{__logger}->{options}->{tag} - " if $self->{__logger}->{options}->{tag};
  return $self->{__logger}->{classname} . ": $tag_append";
}


sub __get_prefix_best {
  my $self = shift;
  my $namespace = $self->{__logger}->{classname};
  my $method = '';
  my $tag_append = '';
  #$namespace = $namespace . ": " if $namespace;
  $method = "->" . $self->{__logger}->{functionname} if $self->{__logger}->{functionname};
  #$method .= ': ' if $method;
  $tag_append = "$self->{__logger}->{options}->{tag} - " if $self->{__logger}->{options}->{tag};
  
  my @line;
  push @line, $namespace if $namespace;
  push @line, $method if $method;
  push @line, $tag_append if $tag_append;
  
  #print Dumper(@line);
  
  #return join(': ', @line);
  my $result = join('', @line);
  $result .= ': ' if $result;
  
  return $result;
  
}


sub log_ {
  my $self = shift;
  my $message = shift;
  
  # automagically instantiate the object if not there
  # TODO: do this by creating a dummy object inheriting from Class::Logger,
  # for now this just don't work because which dummy one to take: Data::Code::Null?
  #if (! ref $self) {
  #  $self = DesignPattern::Object->fromPackage('Class::Logger');
  #}
  
  $self->{__logger}->{level} = shift;    # TODO: implement propagation of this into Log::Dispatch-object '$logger'!
  $self->{__logger}->{options} = shift;   # TODO: implement additional behaviours: e.g. { exit => 1 } would exit after tracedump
  
        $self->{__logger}->{level} ||= $LEVEL_DEFAULT;
  $self->_configure_LogDispatch();
        local $Log::Dispatch::Config::CallerDepth = 3;
  $self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $message );
        #$self->__init('log', $message);
        #$self->__out();
  
}

sub skip {
  my $self = shift;
  my $message = shift;
  my $condition = shift;
  $self->{__logger}->{level} = shift;    # TODO: implement propagation of this into Log::Dispatch-object '$logger'!
  $self->{__logger}->{options} = shift;   # TODO: implement additional behaviours: e.g. { exit => 1 } would exit after tracedump

  my $classname = ref $self;
  my $caller = caller;

  $self->{__logger}->{options}->{tag} ||= '';

  if ($condition) {
    # V1:
    #$logger->warning( __PACKAGE__ . "->_skip: '$caller' (mixed into '$classname'): ($options->{tag}) $message.");
    # V2:
    $self->__init('skip', $message);
    $self->__out();
    return 1;
  }
}

sub trace_ {
  my $self = shift;
  my $message = shift;
  my $data = shift;
  my $condition = shift;
  $self->{__logger}->{level} = shift;    # TODO: implement propagation of this into Log::Dispatch-object '$logger'!
  $self->{__logger}->{options} = shift;   # TODO: implement additional behaviours: e.g. { exit => 1 } would exit after tracedump
  
  my $classname = ref $self;
  my $caller = caller;

  $self->{__logger}->{options}->{tag} ||= '';

  # don't do _any_ tracing if disabled
  return if $self->{TRACE_DISABLED};
  
  # overwrite condition with local configured want-TRACE
  $condition ||= $self->{TRACE};
  
  # dump data
    my $result = 0;
    if ($condition) {
      $message .= " - " . Dumper($data);
      
      # V1:
      # $self->__init('trace');
      # $logger->info( __PACKAGE__ . "->trace: '$caller' (mixed into '$classname'): ($options->{tag}) $message.");
      
      # V2:
                        #local $Log::Dispatch::Config::CallerDepth = 3;
        #$self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $message );
            $self->__init('trace', $message);
            $self->__out();
      
      $result = 1;
    } else {
      $result = 0;
    }

  # handle additional options
  if ($self->{TRACE_OPTIONS}) {
    exit if $self->{__logger}->{options}->{exit};
  }

  return $result;
}


sub _configure_LogDispatch {
  my $self = shift;

  my $configurator = DesignPattern::Object->fromPackage('Log::Dispatch::Configurator::Hardwired');
  
  # check if running inside a 'PROJECT' space
  my $basepath = cwd();
  my $postpone = '/..';
  if (-d $basepath . $postpone . '/PROJECT') {
    $basepath .= $postpone;
    $basepath .= "/var/log";
  }
  
  # configure custom logHandler
  
    if ($configurator) {
  
      $configurator->{file_filename} = "$basepath/perl_app.log";
      $configurator->{screen_min_level} = 'info';
      
      if ($self->{quiet}) {
        $configurator->{screen_min_level} = 8;
      }
  
      if ($self->{debug}) {
        $configurator->{screen_min_level} = 'debug';
      }
      
      if ($self->{LOG_VERBOSE}) {
        $configurator->{verbose} = 1;
      }

      Log::Dispatch::Config->configure($configurator);
      $self->{__logger}->{instance} = Log::Dispatch::Config->instance;

    } else {

      #Log::Dispatch::Config->configure();
      #Log::Dispatch->configure();
      #$self->{__logger}->{instance} = Log::Dispatch->new;
      $self->{__logger}->{instance} = Log::Dispatch::Screen->new( name => 'screen', 'min_level' => 'debug', stderr => 1 );
    
    }


}

sub configure_logger {
  my $self = shift;

  # automagically instantiate the object if not there
  # TODO: do this by creating a dummy object inheriting from Class::Logger,
  # for now this just don't work because which dummy one to take: Data::Code::Null?
  if (! ref $self) {
    $self = DesignPattern::Object->fromPackage('Class::Logger');
  }

  #print "logconfig\n";
  $self->_configure_LogDispatch();
}


# for standalone use
sub new { my $class = shift; my $self = {}; bless $self, $class; }

# convenient shortcuts
# FIXME: create these automagically by mungling with symbolic references
# or: make this object tied to recieve kinda events on method calls

BEGIN {
        no strict 'refs';
        foreach my $l ( qw(debug info notice warning err error
                crit critical alert emerg emergency) ) {
                *{$l} = sub {
                        my $self = shift;
                        local $Log::Dispatch::Config::CallerDepth =
                                $Log::Dispatch::Config::CallerDepth + 1;
                        $self->log( "@_", $l );
                };
        }
}


sub log {
        my $self = shift;
        my ($message, $level) = @_;
        $level ||= 'debug';
        my $logger = $self->_get_instance();
        local $Log::Dispatch::Config::CallerDepth = $Log::Dispatch::Config::CallerDepth + 1;
        $logger->log( level => $level, message => $message );
}

sub dump {
        my $self = shift;
        my $data = shift;
        local $Data::Dumper::Indent = 1;
        local $Data::Dumper::Sortkeys = 1;
        my $dump = Dumper $data;
        local $Log::Dispatch::Config::CallerDepth = $Log::Dispatch::Config::CallerDepth + 1;
        $self->log("DUMP: \n$dump", 'debug');
}
sub strace {
        my $self = shift;
        my $levels = shift || 5;
        $levels = 1 if $levels < 1;
        my $message = "\nSTACK-TRACE:\n";
        for (1..$levels) {
                my ($package, $filename, $line, $subroutine) = (caller $_)[0..3];
                last unless defined $package;
                #$message .= qq#  ${subroutine} ($filename line $line)\n#;
                $message .= qq#  ${subroutine} (line $line)\n#;
        }
        local $Log::Dispatch::Config::CallerDepth = $Log::Dispatch::Config::CallerDepth + 1;
        $self->log($message, 'debug');
}

{
        my $logger;
        my $object;
        sub _create {
                        $object = __PACKAGE__->new();
                        $object->_get_instance(@_);
                        $main::logger = $object;
                        return $object;
        }
        sub _get_instance {
                my $self = shift;
                return $logger if defined $logger;
                my $configurator = $self->_get_configurator();
                if ($configurator) {
                        #warn Dumper $configurator;
                        Log::Dispatch::Config->configure($configurator);
                        $logger = Log::Dispatch::Config->instance;
                }
                else {
                        $logger = Log::Dispatch::Screen->new(
                                 name => 'screen',
                                 'min_level' => 'debug',
                                 stderr => 1
                         );
                }
        }
        sub _get_configurator {
                my $self = shift;
                my $configurator = DesignPattern::Object->fromPackage('Log::Dispatch::Configurator::Hardwired');
                # check if running inside a 'PROJECT' space
                my $basepath = cwd();
                my $postpone = '/..';
                if (-d $basepath . $postpone . '/PROJECT') {
                        $basepath .= $postpone;
                        $basepath .= "/var/log";
                }
                if ($self->{quiet}) {
                        $configurator->{screen_min_level} = 8;
                }
                if ($self->{debug}) {
                        $configurator->{screen_min_level} = 'debug';
                }
                if ($self->{LOG_VERBOSE}) {
                        $configurator->{verbose} = 1;
                }
                $configurator->{file_filename} = "$basepath/perl_app.log";
                $configurator->{screen_min_level} = 'info';
                return $configurator;
        }
}


=pod

=head1 TODO
  
  o $TRACE_STACK_LEVELS   (traces stack history)
  o $ENABLE_DEBUG   (en-/disables level 'debug')
  o $ENABLE_LOG   (en-/disables logging completely)


=cut


1;
__END__
1	ts-dev	1.1	## ------------------------------------------------------------------------
2			## $Id: Logger.pm,v 1.6 2003/06/06 03:19:09 joko Exp $
3			## ------------------------------------------------------------------------
4			## $Log: Logger.pm,v $
5			##
6			## ------------------------------------------------------------------------
7
8
9			=pod
10
11			This is weird! Forget it.
12			But we depend on it!
13			Hmmm....
14
15
16			=cut
17
18
19			package Class::Logger;
20
21			use strict;
22			use warnings;
23
24			use Data::Dumper;
25			use Log::Dispatch;
26			use Log::Dispatch::Screen;
27			use Log::Dispatch::Config;
28			use Cwd;
29			use DesignPattern::Object;
30			use base qw/Exporter/;
31			use vars qw(
32			$LEVEL_DEFAULT
33			$ENABLE_NAMESPACE
34			$NAMESPACE_LEVEL
35			$ENABLE_METHODS
36			$METHOD_LEVELS
37			$TRACE_STACK_LEVELS
38			$loggerai @EXPORT
39			);
40			@EXPORT = qw($logger);
41
42			# default behaviour
43			$LEVEL_DEFAULT = 'debug';
44			$ENABLE_NAMESPACE = 1;
45			$NAMESPACE_LEVEL = undef;
46			$ENABLE_METHODS = 0;
47			$METHOD_LEVELS = [3];
48			$TRACE_STACK_LEVELS = [];
49
50
51			# TODO: review, revise and rewire this!
52			#my $logger = Log::Dispatch::Config->instance;
53
54			sub __init {
55			my $self = shift;
56			my $action = shift;
57			my $message = shift;
58			#my $options = shift; # ??? or: $self->{__logger}->{options} already...?
59
60			# configure
61			if (!$self->{__logger}->{configured}) {
62			$self->{__logger}->{configured} = 1;
63			$self->_configure_LogDispatch();
64			}
65
66			# set passed-in arguments
67			$self->{__logger}->{action} = $action;
68			$self->{__logger}->{message} = $message;
69
70			# trace
71			#my $tmp = caller(2);
72			#print Dumper($tmp);
73			#exit;
74
75
76			# handle caller
77
78			# determine class- and subroutinename of context calling us
79			# this task can be controlled by tuning its behaviour
80			# this can be changed by setting
81			# Class::Logger::...
82			# ...
83			# ...
84			my $calling_class;
85			my $calling_sub;
86
87
88			# Default behaviour is:
89			# Use classname from $self and suppress subroutine name.
90			# In case of using this together with DesignPattern::Bridge,
91			# the classnames of child objects are suppressed.
92			# Instead, the classname of the parent container object
93			# gets used always.
94			$calling_class = '';
95			$calling_sub = '';
96
97			# Log class names (en-/disabled, take from specified level)
98			if ($ENABLE_NAMESPACE) {
99			$calling_class = ref $self;
100			if ($NAMESPACE_LEVEL) {
101			my @entry = caller($NAMESPACE_LEVEL);
102			$calling_class = $entry[0];
103			}
104			}
105
106			# Log method names (en-/disabled, multi-level)
107			if ($ENABLE_METHODS) {
108			my @methods;
109			foreach (@{$METHOD_LEVELS}) {
110			(my $c_package, my $c_filename, my $c_line, my $c_subroutine, my $c_hasargs,
111			my $c_wantarray, my $c_evaltext, my $c_is_require, my $c_hints, my $c_bitmask) = caller($_);
112			$c_subroutine \|\|= '';
113			$c_subroutine =~ s/.*:://;
114			push @methods, $c_subroutine;
115			}
116			$calling_sub = join(': ', @methods) if @methods;
117			}
118
119
120
121			# set default arguments
122			$self->{__logger}->{classname} = $calling_class;
123			$self->{__logger}->{functionname} = $calling_sub;
124			# FIXME: deprecate this!
125			$self->{__logger}->{caller} = caller;
126
127			# set default values
128			$self->{__logger}->{action} \|\|= '';
129			$self->{__logger}->{options}->{tag} \|\|= '';
130
131			# FIXME: deprecate this!
132			#$self->{__logger}->{level} \|\|= 'info';
133			#$self->{__logger}->{level} \|\|= 'debug';
134			$self->{__logger}->{level} \|\|= $LEVEL_DEFAULT;
135
136			# handle stacktrace
137			foreach (@$TRACE_STACK_LEVELS) {
138			#print "trace-level: ", $_, "\n";
139			#(my $c_package, my $c_filename, my $c_line, my $c_subroutine, my $c_hasargs,
140			#my $c_wantarray, my $c_evaltext, my $c_is_require, my $c_hints, my $c_bitmask) = caller($_);
141			my @entry = caller($_);
142			push @{$self->{__logger}->{trace}->{stack}}, \@entry;
143			}
144
145			}
146
147			sub __out {
148			my $self = shift;
149			my $message = shift;
150
151			# if message given here, append to message stored inside object
152			$self->{__logger}->{message} .= ' - ' . $message if $message;
153
154			# TODO: refactor this:
155			# - push '$self->__get_prefix()' to additional log-entry-metadata, don't show it on/in any console/logfile output
156			#$logger->log( level => $self->{__logger}->{level}, message => $self->__get_prefix_long() . $message );
157			#$logger->log( level => $self->{__logger}->{level}, message => $message );
158			#$logger->warning( __PACKAGE__ . "->_skip: '$caller' (mixed into '$classname'): ($options->{tag}) $message.");
159			#$self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $self->__get_prefix_short() . $self->{__logger}->{message} );
160			#$self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $self->__get_prefix_module() . $self->{__logger}->{message} );
161			$self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $self->__get_prefix_best() . $self->{__logger}->{message} );
162			}
163
164
165			sub __handle_options {
166			my $self = shift;
167			#my $options = shift; # ??? or: $self->{__logger}->{options} already...?
168			}
169
170			sub __get_prefix_long {
171			my $self = shift;
172			return __PACKAGE__ . "->$self->{__logger}->{action}: '$self->{__logger}->{caller}' (mixed into '$self->{__logger}->{classname}'): ($self->{__logger}->{options}->{tag}) - ";
173			}
174
175			sub __get_prefix_short {
176			my $self = shift;
177			my $tag_append = '';
178			$tag_append = "$self->{__logger}->{options}->{tag} - " if $self->{__logger}->{options}->{tag};
179			return $self->{__logger}->{classname} . "->$self->{__logger}->{action}: $tag_append";
180			}
181
182			sub __get_prefix_module {
183			my $self = shift;
184			my $tag_append = '';
185			$tag_append = "$self->{__logger}->{options}->{tag} - " if $self->{__logger}->{options}->{tag};
186			return $self->{__logger}->{classname} . ": $tag_append";
187			}
188
189
190			sub __get_prefix_best {
191			my $self = shift;
192			my $namespace = $self->{__logger}->{classname};
193			my $method = '';
194			my $tag_append = '';
195			#$namespace = $namespace . ": " if $namespace;
196			$method = "->" . $self->{__logger}->{functionname} if $self->{__logger}->{functionname};
197			#$method .= ': ' if $method;
198			$tag_append = "$self->{__logger}->{options}->{tag} - " if $self->{__logger}->{options}->{tag};
199
200			my @line;
201			push @line, $namespace if $namespace;
202			push @line, $method if $method;
203			push @line, $tag_append if $tag_append;
204
205			#print Dumper(@line);
206
207			#return join(': ', @line);
208			my $result = join('', @line);
209			$result .= ': ' if $result;
210
211			return $result;
212
213			}
214
215
216			sub log_ {
217			my $self = shift;
218			my $message = shift;
219
220			# automagically instantiate the object if not there
221			# TODO: do this by creating a dummy object inheriting from Class::Logger,
222			# for now this just don't work because which dummy one to take: Data::Code::Null?
223			#if (! ref $self) {
224			# $self = DesignPattern::Object->fromPackage('Class::Logger');
225			#}
226
227			$self->{__logger}->{level} = shift; # TODO: implement propagation of this into Log::Dispatch-object '$logger'!
228			$self->{__logger}->{options} = shift; # TODO: implement additional behaviours: e.g. { exit => 1 } would exit after tracedump
229
230			$self->{__logger}->{level} \|\|= $LEVEL_DEFAULT;
231			$self->_configure_LogDispatch();
232			local $Log::Dispatch::Config::CallerDepth = 3;
233			$self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $message );
234			#$self->__init('log', $message);
235			#$self->__out();
236
237			}
238
239			sub skip {
240			my $self = shift;
241			my $message = shift;
242			my $condition = shift;
243			$self->{__logger}->{level} = shift; # TODO: implement propagation of this into Log::Dispatch-object '$logger'!
244			$self->{__logger}->{options} = shift; # TODO: implement additional behaviours: e.g. { exit => 1 } would exit after tracedump
245
246			my $classname = ref $self;
247			my $caller = caller;
248
249			$self->{__logger}->{options}->{tag} \|\|= '';
250
251			if ($condition) {
252			# V1:
253			#$logger->warning( __PACKAGE__ . "->_skip: '$caller' (mixed into '$classname'): ($options->{tag}) $message.");
254			# V2:
255			$self->__init('skip', $message);
256			$self->__out();
257			return 1;
258			}
259			}
260
261			sub trace_ {
262			my $self = shift;
263			my $message = shift;
264			my $data = shift;
265			my $condition = shift;
266			$self->{__logger}->{level} = shift; # TODO: implement propagation of this into Log::Dispatch-object '$logger'!
267			$self->{__logger}->{options} = shift; # TODO: implement additional behaviours: e.g. { exit => 1 } would exit after tracedump
268
269			my $classname = ref $self;
270			my $caller = caller;
271
272			$self->{__logger}->{options}->{tag} \|\|= '';
273
274			# don't do _any_ tracing if disabled
275			return if $self->{TRACE_DISABLED};
276
277			# overwrite condition with local configured want-TRACE
278			$condition \|\|= $self->{TRACE};
279
280			# dump data
281			my $result = 0;
282			if ($condition) {
283			$message .= " - " . Dumper($data);
284
285			# V1:
286			# $self->__init('trace');
287			# $logger->info( __PACKAGE__ . "->trace: '$caller' (mixed into '$classname'): ($options->{tag}) $message.");
288
289			# V2:
290			#local $Log::Dispatch::Config::CallerDepth = 3;
291			#$self->{__logger}->{instance}->log( level => $self->{__logger}->{level}, message => $message );
292			$self->__init('trace', $message);
293			$self->__out();
294
295			$result = 1;
296			} else {
297			$result = 0;
298			}
299
300			# handle additional options
301			if ($self->{TRACE_OPTIONS}) {
302			exit if $self->{__logger}->{options}->{exit};
303			}
304
305			return $result;
306			}
307
308
309			sub _configure_LogDispatch {
310			my $self = shift;
311
312			my $configurator = DesignPattern::Object->fromPackage('Log::Dispatch::Configurator::Hardwired');
313
314			# check if running inside a 'PROJECT' space
315			my $basepath = cwd();
316			my $postpone = '/..';
317			if (-d $basepath . $postpone . '/PROJECT') {
318			$basepath .= $postpone;
319			$basepath .= "/var/log";
320			}
321
322			# configure custom logHandler
323
324			if ($configurator) {
325
326			$configurator->{file_filename} = "$basepath/perl_app.log";
327			$configurator->{screen_min_level} = 'info';
328
329			if ($self->{quiet}) {
330			$configurator->{screen_min_level} = 8;
331			}
332
333			if ($self->{debug}) {
334			$configurator->{screen_min_level} = 'debug';
335			}
336
337			if ($self->{LOG_VERBOSE}) {
338			$configurator->{verbose} = 1;
339			}
340
341			Log::Dispatch::Config->configure($configurator);
342			$self->{__logger}->{instance} = Log::Dispatch::Config->instance;
343
344			} else {
345
346			#Log::Dispatch::Config->configure();
347			#Log::Dispatch->configure();
348			#$self->{__logger}->{instance} = Log::Dispatch->new;
349			$self->{__logger}->{instance} = Log::Dispatch::Screen->new( name => 'screen', 'min_level' => 'debug', stderr => 1 );
350
351			}
352
353
354			}
355
356			sub configure_logger {
357			my $self = shift;
358
359			# automagically instantiate the object if not there
360			# TODO: do this by creating a dummy object inheriting from Class::Logger,
361			# for now this just don't work because which dummy one to take: Data::Code::Null?
362			if (! ref $self) {
363			$self = DesignPattern::Object->fromPackage('Class::Logger');
364			}
365
366			#print "logconfig\n";
367			$self->_configure_LogDispatch();
368			}
369
370
371
372			# for standalone use
373			sub new { my $class = shift; my $self = {}; bless $self, $class; }
374
375			# convenient shortcuts
376			# FIXME: create these automagically by mungling with symbolic references
377			# or: make this object tied to recieve kinda events on method calls
378
379			BEGIN {
380			no strict 'refs';
381			foreach my $l ( qw(debug info notice warning err error
382			crit critical alert emerg emergency) ) {
383			*{$l} = sub {
384			my $self = shift;
385			local $Log::Dispatch::Config::CallerDepth =
386			$Log::Dispatch::Config::CallerDepth + 1;
387			$self->log( "@_", $l );
388			};
389			}
390			}
391
392
393			sub log {
394			my $self = shift;
395			my ($message, $level) = @_;
396			$level \|\|= 'debug';
397			my $logger = $self->_get_instance();
398			local $Log::Dispatch::Config::CallerDepth = $Log::Dispatch::Config::CallerDepth + 1;
399			$logger->log( level => $level, message => $message );
400			}
401
402			sub dump {
403			my $self = shift;
404			my $data = shift;
405			local $Data::Dumper::Indent = 1;
406			local $Data::Dumper::Sortkeys = 1;
407			my $dump = Dumper $data;
408			local $Log::Dispatch::Config::CallerDepth = $Log::Dispatch::Config::CallerDepth + 1;
409			$self->log("DUMP: \n$dump", 'debug');
410			}
411			sub strace {
412			my $self = shift;
413			my $levels = shift \|\| 5;
414			$levels = 1 if $levels < 1;
415			my $message = "\nSTACK-TRACE:\n";
416			for (1..$levels) {
417			my ($package, $filename, $line, $subroutine) = (caller $_)[0..3];
418			last unless defined $package;
419			#$message .= qq# ${subroutine} ($filename line $line)\n#;
420			$message .= qq# ${subroutine} (line $line)\n#;
421			}
422			local $Log::Dispatch::Config::CallerDepth = $Log::Dispatch::Config::CallerDepth + 1;
423			$self->log($message, 'debug');
424			}
425
426			{
427			my $logger;
428			my $object;
429			sub _create {
430			$object = __PACKAGE__->new();
431			$object->_get_instance(@_);
432			$main::logger = $object;
433			return $object;
434			}
435			sub _get_instance {
436			my $self = shift;
437			return $logger if defined $logger;
438			my $configurator = $self->_get_configurator();
439			if ($configurator) {
440			#warn Dumper $configurator;
441			Log::Dispatch::Config->configure($configurator);
442			$logger = Log::Dispatch::Config->instance;
443			}
444			else {
445			$logger = Log::Dispatch::Screen->new(
446			name => 'screen',
447			'min_level' => 'debug',
448			stderr => 1
449			);
450			}
451			}
452			sub _get_configurator {
453			my $self = shift;
454			my $configurator = DesignPattern::Object->fromPackage('Log::Dispatch::Configurator::Hardwired');
455			# check if running inside a 'PROJECT' space
456			my $basepath = cwd();
457			my $postpone = '/..';
458			if (-d $basepath . $postpone . '/PROJECT') {
459			$basepath .= $postpone;
460			$basepath .= "/var/log";
461			}
462			if ($self->{quiet}) {
463			$configurator->{screen_min_level} = 8;
464			}
465			if ($self->{debug}) {
466			$configurator->{screen_min_level} = 'debug';
467			}
468			if ($self->{LOG_VERBOSE}) {
469			$configurator->{verbose} = 1;
470			}
471			$configurator->{file_filename} = "$basepath/perl_app.log";
472			$configurator->{screen_min_level} = 'info';
473			return $configurator;
474			}
475			}
476
477
478			=pod
479
480			=head1 TODO
481
482			o $TRACE_STACK_LEVELS (traces stack history)
483			o $ENABLE_DEBUG (en-/disables level 'debug')
484			o $ENABLE_LOG (en-/disables logging completely)
485
486
487			=cut
488
489
490			1;
491			__END__
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