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## $Id$ |
## $Id$ |
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## --------------------------------------------------------------------------- |
## --------------------------------------------------------------------------- |
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## $Log$ |
## $Log$ |
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## Revision 1.10 2003/05/13 08:46:08 joko |
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## pod and comments |
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## |
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## Revision 1.9 2003/03/27 15:44:32 joko |
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## fixes/enhancements to 'sub log_basic' |
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## |
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## Revision 1.8 2003/02/19 00:36:59 joko |
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## + bugfix: this {logger} is the instance itself, so has to be fed with ( level => xyz and namespace => xyz ) |
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## + minor modifications in behaviour |
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## |
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## Revision 1.7 2003/02/18 18:34:35 joko |
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## + fix: just logs if possible (sub log_basic) |
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## |
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## Revision 1.6 2003/02/11 11:04:27 joko |
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## + metadata (args, caller, etc.) are now stored inside {__bridge} |
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## |
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## Revision 1.5 2003/02/09 16:24:46 joko |
## Revision 1.5 2003/02/09 16:24:46 joko |
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## + pseudo constructor mechanism by calling method 'constructor' on object instantiation |
## + pseudo constructor mechanism by calling method 'constructor' on object instantiation |
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## |
## |
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## |
## |
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## --------------------------------------------------------------------------- |
## --------------------------------------------------------------------------- |
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=pod |
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=head1 NAME |
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DesignPattern::Object |
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=head1 TODO |
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o use Class::Loader |
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=cut |
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package DesignPattern::Object; |
package DesignPattern::Object; |
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#use Devel::StackTrace; |
#use Devel::StackTrace; |
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# get logger instance |
my $_dp_globals; |
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my $logger = eval { Log::Dispatch::Config->instance; }; |
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$_dp_globals = { |
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TRACE => 0, |
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}; |
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sub new { |
sub new { |
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# use already blessed reference, if passed in - else use the very classname |
# use already blessed reference, if passed in - else use the very classname |
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my $class = ref ($classname) || $classname; |
my $class = ref ($classname) || $classname; |
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$logger->debug( "$classname->new( ... )" . "\t[via " . __PACKAGE__ . "]" ) if $logger; |
#$self->log_basic( "$classname->new( ... )" . "\t[via " . __PACKAGE__ . "]" , 'debug'); |
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# the base for our object - a plain perl hash, which .... |
# the base for our object - a plain perl hash, which .... |
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my $self = {}; |
my $self = {}; |
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# TODO: what about logging in here? inherit from |
# TODO: what about logging in here? inherit from |
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# DesignPattern::Object::Logger for this purpose.... |
# DesignPattern::Object::Logger for this purpose.... |
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# ... or would this give us (harmful) circular module dependencies??? |
# ... or would this give us (harmful) circular module dependencies??? |
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#$logger->debug( __PACKAGE__ . "->new( @args )" ); # this is not "common"! |
#$self->log_basic( __PACKAGE__ . "->new( @args )", 'debug' ); # this is not "common"! |
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# remember the stacktrace: abstract this out (DesignPattern::Object::Trace) or parametrize! |
# remember the stacktrace: abstract this out (DesignPattern::Object::Trace) or parametrize! |
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# mixin arguments |
# mixin arguments |
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$self = { @args }; |
$self = { @args }; |
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# mixin seperate |
# scan for arguments prefixed by a double underscore '__' |
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$self->{'__arg'} = $seperate if $seperate; |
foreach (keys %$self) { |
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if (/^__(.+?)$/) { |
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$self->{__bridge}->{$1} = $self->{$_}; |
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delete $self->{$_}; |
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} |
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} |
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# mixin seperate - FIXME: should this not be done after blessing? |
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$self->{__bridge}->{'arg'} = $seperate if $seperate; |
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# ... bless hash into object using classname |
# ... bless hash into object using classname |
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bless $self, $class; |
bless $self, $class; |
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# remember the caller |
# remember the caller |
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$self->{'__caller'} = caller; |
$self->{__bridge}->{caller_module} = caller; |
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#print Dumper(caller(2)); |
#print Dumper(caller(2)); |
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#exit; |
#exit; |
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$self->{__classname} = $classname; |
$self->{__bridge}->{class_name} = $classname; |
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# patches for backward compatibility |
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$self->{'__arg'} = $self->{__bridge}->{'arg'} if $self->{__bridge}->{'arg'}; |
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$self->{'__caller'} = $self->{__bridge}->{caller_module} if $self->{__bridge}->{caller_module}; |
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$self->{'__classname'} = $self->{__bridge}->{class_name} if $self->{__bridge}->{class_name}; |
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$self->_init() if $self->can('_init'); |
$self->_init() if $self->can('_init'); |
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$self->constructor() if $self->can('constructor'); |
$self->constructor() if $self->can('constructor'); |
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# trace |
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#print Dumper($self); |
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#exit; |
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return $self; |
return $self; |
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} |
} |
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my $self_classname = ref $self; |
my $self_classname = ref $self; |
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my $function_name = shift; |
my $function_name = shift; |
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# was: |
# was: |
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$logger->warning( __PACKAGE__ . ": function '$function_name' is an abstract method, please implement it in '$self_classname'."); |
$self->log_basic( __PACKAGE__ . ": function '$function_name' is an abstract method, please implement it in '$self_classname'.", 'warning'); |
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# is: |
# is: |
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#die( __PACKAGE__ . ": Function '$function_name' is an abstract method, please implement it in '$self_classname'."); |
#die( __PACKAGE__ . ": Function '$function_name' is an abstract method, please implement it in '$self_classname'."); |
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#exit; |
#exit; |
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#print Dumper($args); |
#print Dumper($args); |
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$logger->debug( __PACKAGE__ . "->fromPackage( pkgname $pkgname args @args )" ); |
$self->log_basic( __PACKAGE__ . "->fromPackage( pkgname $pkgname args @args )", 'debug'); |
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# perl-load |
# perl-load |
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my $evstring = "use $pkgname;"; |
my $evstring = "use $pkgname;"; |
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eval($evstring); |
eval($evstring); |
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# report errors |
# report errors |
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# Could this be united with DesignPattern::Loader::checkExceptions? |
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if ($@) { |
if ($@) { |
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# build error-messages |
# build error-messages |
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my $errmsg_native = __PACKAGE__ . ':' . __LINE__ . " Error in eval \"$evstring\": " . $@; |
my $issuer = __PACKAGE__ . ':' . __LINE__; |
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my $errmsg_native = "Error in eval: " . $@; |
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#my $classname = $self->{__classname}; |
#my $classname = $self->{__classname}; |
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my $errmsg_critical = ''; |
my $errmsg_critical = ''; |
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if ($errmsg_native =~ m/Can't locate (.+?) in \@INC/) { |
if ($errmsg_native =~ m/Can't locate (.+?) in \@INC/) { |
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$errmsg_critical = "Could not instantiate object from package '$pkgname' - location of '$1' failed."; |
$errmsg_critical = "Could not instantiate object from package '$pkgname' ('$1' not found)."; |
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} else { |
} else { |
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$errmsg_critical = $errmsg_native; |
$errmsg_critical = $errmsg_native; |
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} |
} |
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# write error to logging-output (console|file|database) |
# write error to logging-output (console|file|database) |
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$logger->debug( $errmsg_native ); |
$self->log_basic( $errmsg_native . " (issuer='$issuer', code='$evstring')", 'debug' ); |
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$logger->critical( $errmsg_critical ); |
$self->log_basic( $errmsg_critical, 'warning' ); |
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return; |
return; |
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} |
} |
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# object-creation |
# object-creation |
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my $object = $pkgname->new(@args); |
my $object = $pkgname->new(@args); |
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# trace |
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#print Dumper($object); |
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# run boot-methods on object |
# run boot-methods on object |
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$object->_init() if $object->can('_init'); |
$object->_init() if $object->can('_init'); |
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$object->constructor() if $object->can('constructor'); |
$object->constructor() if $object->can('constructor'); |
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return $object; |
return $object; |
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} |
} |
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sub log_basic { |
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my $self = shift; |
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my $message = shift; |
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my $level = shift; |
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#return; |
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$level ||= 'info'; |
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my $notSoGood = ($level =~ /warning|error|critical/); |
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# STDERR? |
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if ($level && $notSoGood) { |
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print STDERR $level, ": ", $message, "\n"; |
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} |
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# STDOUT? |
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if ($_dp_globals->{TRACE} || $notSoGood) { |
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print $level, ": ", $message, "\n"; |
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} |
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# get logger instance |
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if (!$_dp_globals->{logger}) { |
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$_dp_globals->{logger} = eval { Log::Dispatch::Config->instance; }; |
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} |
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if ($_dp_globals->{logger}) { |
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$_dp_globals->{logger}->log( level => $level, message => $message); |
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#} else { |
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#print $level, ": ", $message, "\n"; |
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} |
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} |
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1; |
1; |
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__END__ |