/[cvs]/nfo/perl/libs/DesignPattern/Bridge.pm
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revision 1.4 by joko, Mon Jan 20 16:55:15 2003 UTC revision 1.8 by joko, Fri Feb 14 14:20:05 2003 UTC
# Line 2  Line 2 
2  ##  $Id$  ##  $Id$
3  ## --------------------------------------------------------------------------------  ## --------------------------------------------------------------------------------
4  ##  $Log$  ##  $Log$
5    ##  Revision 1.8  2003/02/14 14:20:05  joko
6    ##  + modified mixin behaviour
7    ##
8    ##  Revision 1.7  2003/02/11 10:34:19  joko
9    ##  + loaded module may now lack 'mixin::with' declaration
10    ##  + this gets us the possibility to load modules from any perl namespace
11    ##     + enabled this mechanism
12    ##
13    ##  Revision 1.6  2003/02/09 16:22:51  joko
14    ##  + pseudo constructor mechanism via options
15    ##
16    ##  Revision 1.5  2003/01/31 01:19:50  root
17    ##  + fixed: doesn't need Log::Dispatch any more, but uses it if available
18    ##
19  ##  Revision 1.4  2003/01/20 16:55:15  joko  ##  Revision 1.4  2003/01/20 16:55:15  joko
20  ##  + sub mixinPackage  ##  + sub mixinPackage
21  ##  + sub include  ##  + sub include
# Line 29  use Data::Dumper; Line 43  use Data::Dumper;
43    
44  ## ========   object inheritance   ========  ## ========   object inheritance   ========
45    
46  # TODO:  # TODO / REFACTORING PROPOSAL
47    # leading from Data::Storage to code abstracted out into this module - DesignPattern::Bridge
48  #   - this is no inheritance and it doesn't have to be  #   - this is no inheritance and it doesn't have to be
49  #   - implement this module as a bridge to its sub-modules  #   - implement this module as a bridge to its sub-modules
50  #   - use the BridgePattern (http://c2.com/cgi/wiki?BridgePattern)  #   - use the BridgePattern (http://c2.com/cgi/wiki?BridgePattern)
# Line 40  use Data::Dumper; Line 55  use Data::Dumper;
55  #   - sub getChildNodes  #   - sub getChildNodes
56  #   - sub run  #   - sub run
57    
58    # 2003-02-11, joko: does this have anything in parallel with CPAN's Class::Inner?
59    
60    
61  # get logger instance  # get logger instance
62  my $logger = Log::Dispatch::Config->instance;  my $logger = eval { Log::Dispatch::Config->instance; };
63        
64  my $meta;  my $meta;
65    
66  ## ========   object constructor   ========  ## ========   object constructor   ========
67    sub new {  sub new {
68      my $invocant = shift;    my $invocant = shift;
69      my $class = ref($invocant) || $invocant;    my $class = ref($invocant) || $invocant;
70      my @args = ();    my @args = ();
71      @_ && (@args = @_);    @_ && (@args = @_);
72      $logger->debug( __PACKAGE__ . "->new(@args)" );    $logger->debug( __PACKAGE__ . "->new(@args)" ) if $logger;
73      my $self = { @_ };    my $self = { @_ };
74    
75      # trace
76      #print "class: $class", "\n";      #print "class: $class", "\n";
77      bless $self, $class;  
78      ##if (my $bizWorks = shift) {    # create instance
79        ##$self->boot($bizWorks);    bless $self, $class;
80      ##}    
81          return $self;
82      return $self;  }
   }  
83    
84    
85  ## ========   method overrider   ========  ## ========   method overrider   ========
# Line 74  my $meta; Line 93  my $meta;
93      my $method = $AUTOLOAD;      my $method = $AUTOLOAD;
94      $method =~ s/^.*:://;      $method =~ s/^.*:://;
95        
96      $logger->debug( __PACKAGE__ . "->" . $method . "(@_)" . " (AUTOLOAD called, not dispatched)" );      $logger->debug( __PACKAGE__ . "->" . $method . "(@_)" . " (AUTOLOAD called, not dispatched)" ) if $logger;
97    
98      ## ->DESTROY would - if not declared - trigger an AUTOLOAD also      ## ->DESTROY would - if not declared - trigger an AUTOLOAD also
99      return if $method =~ m/::DESTROY$/;      return if $method =~ m/::DESTROY$/;
# Line 95  my $meta; Line 114  my $meta;
114            
115      # build full package name      # build full package name
116      my $self_classname = ref $self;      my $self_classname = ref $self;
117      my $package = $self_classname . '::' . $modulename_load;        # name
118          my $package = $modulename_load;
119          
120          # if package is absolute, cut away prefix ('/' or '::')
121          if ($package !~ s/^:://) {
122            # else: prefix with base classname if above name is relative (lacks of '/' or '::')
123            $package = $self_classname . '::' . $package
124          }
125        
126      return $package;      return $package;
127    }    }
128        
# Line 104  my $meta; Line 131  my $meta;
131      my $self = shift;      my $self = shift;
132      my $modulename_load = shift;      my $modulename_load = shift;
133    
134        my $options = shift;
135    
136      my $self_modulename = ref $self;      my $self_modulename = ref $self;
137      my $package = $self->_getPluginPackage($modulename_load);      my $package = $self->_getPluginPackage($modulename_load);
138            
# Line 111  my $meta; Line 140  my $meta;
140        return 1;        return 1;
141      }      }
142            
143      #$logger->info( __PACKAGE__ . "->load: $package" );      #$logger->info( __PACKAGE__ . "->load: $package" ) if $logger;
144      #$logger->info( __PACKAGE__ . "->load: $self_modulename" );      #$logger->info( __PACKAGE__ . "->load: $self_modulename" ) if $logger;
145      $logger->debug( $self_modulename . "->load: $package\t[via " . __PACKAGE__ . "]" );      $logger->debug( $self_modulename . "->load: $package\t[via " . __PACKAGE__ . "]" ) if $logger;
146    
147      # this is the module testing phase - use mixin doesn't seem to propagate errors by default      # this is the module testing phase - use mixin doesn't seem to propagate errors by default
148      eval("use $package;");      eval("use $package;");
# Line 122  my $meta; Line 151  my $meta;
151        # include caller information        # include caller information
152        my @caller = caller;        my @caller = caller;
153        my $caller_msg = $caller[1] . ':' . $caller[2];        my $caller_msg = $caller[1] . ':' . $caller[2];
154        $logger->error( __PACKAGE__ . "->load: $@ ($caller_msg)" );        my $msg =  __PACKAGE__ . "->load: $@ ($caller_msg)";
155          if ($logger) {
156            $logger->error($msg);
157          } else {
158            print $msg, "\n";
159          }
160      }      }
161    
162  #print "ref-1: ", ref $self, "\n";  #print "ref-1: ", ref $self, "\n";
# Line 132  my $meta; Line 166  my $meta;
166      #bless $self, $package;      #bless $self, $package;
167    
168      # V2:      # V2:
     # switch into foreign package and mixin plugin-module  
169      $self->mixinPackage($package);      $self->mixinPackage($package);
170        
171        if (my $method = $options->{method}) {
172          $self->$method();
173        }
174    
175      return 1;      return 1;
176            
177    }    }
178      
179      sub mixinPackage {
180        my $self = shift;
181        my $package = shift;
182        
183        # switch into foreign package and prepare for mixin
184        $self->mixin_prepare($package);
185    
186        # switch into local package (scope which uses DesignPattern::Bridge) and mixin plugin-module
187        $self->mixin_do($package);
188    
189      }
190    
191    # TODO: maybe refactor to DesignPattern::Object? what about the '$logger'?    # TODO: maybe refactor to DesignPattern::Object? what about the '$logger'?
192    sub mixinPackage {    sub mixin_prepare {
193        my $self = shift;
194        my $package = shift;
195        my $self_classname = ref $self;
196        eval("package $package; use mixin::with '$self_classname';");
197    
198        # FIXME: --- this is redundant ---
199        if ($@) {
200          $meta->{loaded}->{$package} = 0;
201          $logger->error( __PACKAGE__ . "->load: $@" ) if $logger;
202        } else {
203          $meta->{loaded}->{$package} = 1;
204        }
205        # FIXME: --- this is redundant ---
206    
207      }
208    
209      sub mixin_do {
210      my $self = shift;      my $self = shift;
211      my $package = shift;      my $package = shift;
212      # switch into foreign package and mixin plugin-module      # switch into foreign package and mixin plugin-module
213      my $self_classname = ref $self;      my $self_classname = ref $self;
214      eval("package $self_classname; use mixin '$package';");      eval("package $self_classname; use mixin '$package';");
215      #eval("use mixin_all '$package';");      #eval("use mixin_all '$package';");
216    
217        # FIXME: --- this is redundant ---
218      if ($@) {      if ($@) {
219        $meta->{loaded}->{$package} = 0;        $meta->{loaded}->{$package} = 0;
220        $logger->error( __PACKAGE__ . "->load: $@" );        $logger->error( __PACKAGE__ . "->load: $@" ) if $logger;
221      } else {      } else {
222        $meta->{loaded}->{$package} = 1;        $meta->{loaded}->{$package} = 1;
223      }      }
224        # FIXME: --- this is redundant ---
225    
226    }    }
227    
228    sub unload {    sub unload {
# Line 165  my $meta; Line 235  my $meta;
235      if ($meta->{loaded}->{$package}) {      if ($meta->{loaded}->{$package}) {
236        $meta->{loaded}->{$package} = 0;        $meta->{loaded}->{$package} = 0;
237        my $where = __PACKAGE__ . ':' . __LINE__;        my $where = __PACKAGE__ . ':' . __LINE__;
238        $logger->debug( __PACKAGE__ . "->unload: FIXME: DESTROY object is not implemented at '$where'." );        $logger->debug( __PACKAGE__ . "->unload: FIXME: DESTROY object is not implemented at '$where'." ) if $logger;
239      }      }
240    
241    }    }
# Line 186  my $meta; Line 256  my $meta;
256    }    }
257    
258  1;  1;
259    __END__
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