1 |
joko |
1.3 |
## --------------------------------------------------------------------------- |
2 |
joko |
1.9 |
## $Id: Object.pm,v 1.8 2003/02/19 00:36:59 joko Exp $ |
3 |
joko |
1.3 |
## --------------------------------------------------------------------------- |
4 |
joko |
1.2 |
## $Log: Object.pm,v $ |
5 |
joko |
1.9 |
## Revision 1.8 2003/02/19 00:36:59 joko |
6 |
|
|
## + bugfix: this {logger} is the instance itself, so has to be fed with ( level => xyz and namespace => xyz ) |
7 |
|
|
## + minor modifications in behaviour |
8 |
|
|
## |
9 |
joko |
1.8 |
## Revision 1.7 2003/02/18 18:34:35 joko |
10 |
|
|
## + fix: just logs if possible (sub log_basic) |
11 |
|
|
## |
12 |
joko |
1.7 |
## Revision 1.6 2003/02/11 11:04:27 joko |
13 |
|
|
## + metadata (args, caller, etc.) are now stored inside {__bridge} |
14 |
|
|
## |
15 |
joko |
1.6 |
## Revision 1.5 2003/02/09 16:24:46 joko |
16 |
|
|
## + pseudo constructor mechanism by calling method 'constructor' on object instantiation |
17 |
|
|
## |
18 |
joko |
1.5 |
## Revision 1.4 2003/01/22 17:56:49 root |
19 |
|
|
## + fix: just use the logger if it's available |
20 |
|
|
## |
21 |
root |
1.4 |
## Revision 1.3 2003/01/20 16:54:22 joko |
22 |
|
|
## + sub fromPackage: refactored from libp's 'getNewPerlObjFromPkgName' or s.th.l.th. |
23 |
|
|
## |
24 |
joko |
1.3 |
## Revision 1.2 2002/12/27 16:05:42 joko |
25 |
|
|
## + played with Devel::CallerItem and Devel::StackTrace |
26 |
|
|
## |
27 |
joko |
1.2 |
## Revision 1.1 2002/12/13 21:46:29 joko |
28 |
|
|
## + initial check-in |
29 |
|
|
## |
30 |
joko |
1.3 |
## --------------------------------------------------------------------------- |
31 |
joko |
1.1 |
|
32 |
|
|
|
33 |
|
|
package DesignPattern::Object; |
34 |
|
|
|
35 |
|
|
use strict; |
36 |
|
|
use warnings; |
37 |
joko |
1.2 |
|
38 |
|
|
|
39 |
|
|
use Data::Dumper; |
40 |
|
|
#use Devel::CallerItem; |
41 |
|
|
#use Devel::StackTrace; |
42 |
|
|
|
43 |
joko |
1.3 |
|
44 |
joko |
1.7 |
my $_dp_globals; |
45 |
|
|
|
46 |
|
|
$_dp_globals = { |
47 |
|
|
TRACE => 0, |
48 |
|
|
}; |
49 |
|
|
|
50 |
joko |
1.3 |
|
51 |
joko |
1.2 |
sub new { |
52 |
|
|
|
53 |
|
|
# the classname in most cases |
54 |
|
|
my $classname = shift; |
55 |
|
|
|
56 |
|
|
# use already blessed reference, if passed in - else use the very classname |
57 |
|
|
my $class = ref ($classname) || $classname; |
58 |
|
|
|
59 |
joko |
1.7 |
#$self->log_basic( "$classname->new( ... )" . "\t[via " . __PACKAGE__ . "]" , 'debug'); |
60 |
joko |
1.3 |
|
61 |
joko |
1.2 |
# the base for our object - a plain perl hash, which .... |
62 |
|
|
my $self = {}; |
63 |
|
|
# note: |
64 |
|
|
# this makes an instance of an arbitrary perl variable, |
65 |
|
|
# the most often used for this purpose is - guess it - the hash, |
66 |
|
|
# since it resembles object-properties in a convenient way: |
67 |
|
|
# $object->{property} = 'Hello World!'; |
68 |
|
|
# if you _do_ care about privacy you might take a look |
69 |
|
|
# at CPAN's Tie::SecureHash or Class::Contract ... have fun! |
70 |
|
|
|
71 |
|
|
# TODO: what about logging in here? inherit from |
72 |
|
|
# DesignPattern::Object::Logger for this purpose.... |
73 |
|
|
# ... or would this give us (harmful) circular module dependencies??? |
74 |
joko |
1.7 |
#$self->log_basic( __PACKAGE__ . "->new( @args )", 'debug' ); # this is not "common"! |
75 |
joko |
1.2 |
|
76 |
|
|
|
77 |
|
|
# remember the stacktrace: abstract this out (DesignPattern::Object::Trace) or parametrize! |
78 |
|
|
#my $trace = Devel::StackTrace->new(); |
79 |
|
|
#print Dumper($trace); |
80 |
|
|
#print Dumper($trace->frame(1)->args()); |
81 |
|
|
|
82 |
|
|
#print "args: ", $self->{'__caller'}->hasargs(), "\n"; |
83 |
|
|
|
84 |
|
|
#print Dumper($self); |
85 |
|
|
#exit; |
86 |
|
|
|
87 |
joko |
1.3 |
|
88 |
joko |
1.2 |
# argument-handling ... |
89 |
|
|
|
90 |
|
|
# ... get them ... |
91 |
|
|
my @args = (); |
92 |
|
|
@_ && (@args = @_); |
93 |
|
|
|
94 |
|
|
# ... check if we can coerce them into an array (this needs an even number of arguments) |
95 |
|
|
my $argcount = $#args + 1; |
96 |
|
|
my $fract = $argcount / 2; |
97 |
|
|
|
98 |
|
|
my $seperate = pop @args if $fract != int($fract); |
99 |
|
|
|
100 |
|
|
# mixin arguments |
101 |
|
|
$self = { @args }; |
102 |
|
|
|
103 |
joko |
1.6 |
# scan for arguments prefixed by a double underscore '__' |
104 |
|
|
foreach (keys %$self) { |
105 |
|
|
if (/^__(.+?)$/) { |
106 |
|
|
$self->{__bridge}->{$1} = $self->{$_}; |
107 |
|
|
delete $self->{$_}; |
108 |
|
|
} |
109 |
|
|
} |
110 |
|
|
|
111 |
|
|
# mixin seperate - FIXME: should this not be done after blessing? |
112 |
|
|
$self->{__bridge}->{'arg'} = $seperate if $seperate; |
113 |
joko |
1.2 |
|
114 |
|
|
# ... bless hash into object using classname |
115 |
|
|
bless $self, $class; |
116 |
joko |
1.3 |
|
117 |
|
|
# remember the caller |
118 |
joko |
1.6 |
$self->{__bridge}->{caller_module} = caller; |
119 |
joko |
1.3 |
#print Dumper(caller(2)); |
120 |
|
|
#exit; |
121 |
|
|
|
122 |
joko |
1.6 |
$self->{__bridge}->{class_name} = $classname; |
123 |
|
|
|
124 |
|
|
# patches for backward compatibility |
125 |
|
|
$self->{'__arg'} = $self->{__bridge}->{'arg'} if $self->{__bridge}->{'arg'}; |
126 |
|
|
$self->{'__caller'} = $self->{__bridge}->{caller_module} if $self->{__bridge}->{caller_module}; |
127 |
|
|
$self->{'__classname'} = $self->{__bridge}->{class_name} if $self->{__bridge}->{class_name}; |
128 |
joko |
1.3 |
|
129 |
joko |
1.2 |
$self->_init() if $self->can('_init'); |
130 |
joko |
1.5 |
$self->constructor() if $self->can('constructor'); |
131 |
joko |
1.6 |
|
132 |
|
|
# trace |
133 |
|
|
#print Dumper($self); |
134 |
|
|
#exit; |
135 |
joko |
1.3 |
|
136 |
joko |
1.2 |
return $self; |
137 |
|
|
} |
138 |
joko |
1.1 |
|
139 |
|
|
sub _abstract_function { |
140 |
|
|
my $self = shift; |
141 |
|
|
my $self_classname = ref $self; |
142 |
|
|
my $function_name = shift; |
143 |
|
|
# was: |
144 |
joko |
1.7 |
$self->log_basic( __PACKAGE__ . ": function '$function_name' is an abstract method, please implement it in '$self_classname'.", 'warning'); |
145 |
joko |
1.1 |
# is: |
146 |
joko |
1.3 |
#die( __PACKAGE__ . ": Function '$function_name' is an abstract method, please implement it in '$self_classname'."); |
147 |
joko |
1.1 |
#exit; |
148 |
joko |
1.3 |
} |
149 |
|
|
|
150 |
|
|
sub fromPackage { |
151 |
|
|
my $self = shift; |
152 |
|
|
#my $self_classname = ref $self; |
153 |
|
|
my $pkgname = shift; |
154 |
|
|
my @args = @_; |
155 |
|
|
# my $args = shift; |
156 |
|
|
|
157 |
|
|
# my $caller = $self->{'__caller'}; |
158 |
|
|
|
159 |
|
|
#print Dumper($args); |
160 |
|
|
|
161 |
joko |
1.7 |
$self->log_basic( __PACKAGE__ . "->fromPackage( pkgname $pkgname args @args )", 'debug'); |
162 |
joko |
1.3 |
|
163 |
|
|
# perl-load |
164 |
|
|
my $evstring = "use $pkgname;"; |
165 |
|
|
eval($evstring); |
166 |
|
|
|
167 |
|
|
# report errors |
168 |
|
|
if ($@) { |
169 |
|
|
# build error-messages |
170 |
joko |
1.8 |
my $issuer = __PACKAGE__ . ':' . __LINE__; |
171 |
|
|
my $errmsg_native = "Error in eval: " . $@; |
172 |
joko |
1.3 |
#my $classname = $self->{__classname}; |
173 |
|
|
my $errmsg_critical = ''; |
174 |
|
|
if ($errmsg_native =~ m/Can't locate (.+?) in \@INC/) { |
175 |
joko |
1.7 |
$errmsg_critical = "Could not instantiate object from package '$pkgname' ('$1' not found)."; |
176 |
joko |
1.3 |
} else { |
177 |
|
|
$errmsg_critical = $errmsg_native; |
178 |
|
|
} |
179 |
|
|
# write error to logging-output (console|file|database) |
180 |
joko |
1.8 |
$self->log_basic( $errmsg_native . " (issuer='$issuer', code='$evstring')", 'debug' ); |
181 |
joko |
1.7 |
$self->log_basic( $errmsg_critical, 'warning' ); |
182 |
joko |
1.3 |
return; |
183 |
|
|
} |
184 |
|
|
|
185 |
|
|
# object-creation |
186 |
|
|
my $object = $pkgname->new(@args); |
187 |
|
|
|
188 |
joko |
1.9 |
# trace |
189 |
|
|
#print Dumper($object); |
190 |
|
|
|
191 |
joko |
1.3 |
# run boot-methods on object |
192 |
|
|
$object->_init() if $object->can('_init'); |
193 |
joko |
1.5 |
$object->constructor() if $object->can('constructor'); |
194 |
joko |
1.3 |
|
195 |
|
|
return $object; |
196 |
joko |
1.1 |
} |
197 |
|
|
|
198 |
joko |
1.7 |
sub log_basic { |
199 |
|
|
my $self = shift; |
200 |
|
|
my $message = shift; |
201 |
|
|
my $level = shift; |
202 |
joko |
1.8 |
|
203 |
|
|
#return; |
204 |
|
|
$level ||= 'info'; |
205 |
joko |
1.7 |
|
206 |
joko |
1.9 |
my $notSoGood = ($level =~ /warning|error|critical/); |
207 |
|
|
|
208 |
|
|
# STDERR? |
209 |
|
|
if ($level && $notSoGood) { |
210 |
|
|
print STDERR $level, ": ", $message, "\n"; |
211 |
|
|
} |
212 |
|
|
|
213 |
|
|
# STDOUT? |
214 |
|
|
if ($_dp_globals->{TRACE} || $notSoGood) { |
215 |
joko |
1.7 |
print $level, ": ", $message, "\n"; |
216 |
|
|
} |
217 |
|
|
|
218 |
|
|
# get logger instance |
219 |
|
|
if (!$_dp_globals->{logger}) { |
220 |
|
|
$_dp_globals->{logger} = eval { Log::Dispatch::Config->instance; }; |
221 |
|
|
} |
222 |
|
|
|
223 |
|
|
if ($_dp_globals->{logger}) { |
224 |
joko |
1.8 |
$_dp_globals->{logger}->log( level => $level, message => $message); |
225 |
joko |
1.7 |
#} else { |
226 |
|
|
#print $level, ": ", $message, "\n"; |
227 |
|
|
} |
228 |
|
|
|
229 |
|
|
} |
230 |
|
|
|
231 |
joko |
1.1 |
1; |
232 |
joko |
1.7 |
__END__ |