/[cvs]/nfo/perl/libs/DesignPattern/Bridge.pm
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revision 1.1 by joko, Fri Dec 13 21:46:29 2002 UTC revision 1.6 by joko, Sun Feb 9 16:22:51 2003 UTC
# Line 2  Line 2 
2  ##  $Id$  ##  $Id$
3  ## --------------------------------------------------------------------------------  ## --------------------------------------------------------------------------------
4  ##  $Log$  ##  $Log$
5    ##  Revision 1.6  2003/02/09 16:22:51  joko
6    ##  + pseudo constructor mechanism via options
7    ##
8    ##  Revision 1.5  2003/01/31 01:19:50  root
9    ##  + fixed: doesn't need Log::Dispatch any more, but uses it if available
10    ##
11    ##  Revision 1.4  2003/01/20 16:55:15  joko
12    ##  + sub mixinPackage
13    ##  + sub include
14    ##
15    ##  Revision 1.3  2002/12/16 19:57:12  joko
16    ##  + sub unload
17    ##
18    ##  Revision 1.2  2002/12/15 02:06:15  joko
19    ##  + feature to be able to specify module in non-perl-style when loading plugins: e.g. $process->load('Setup/Storage')
20    ##
21  ##  Revision 1.1  2002/12/13 21:46:29  joko  ##  Revision 1.1  2002/12/13 21:46:29  joko
22  ##  + initial check-in  ##  + initial check-in
23  ##  ##
# Line 15  use warnings; Line 31  use warnings;
31    
32  use base qw( DesignPattern::Object );  use base qw( DesignPattern::Object );
33    
34    use Data::Dumper;
35    
36  ## ========   object inheritance   ========  ## ========   object inheritance   ========
37    
38  # TODO:  # TODO:
# Line 29  use base qw( DesignPattern::Object ); Line 47  use base qw( DesignPattern::Object );
47  #   - sub run  #   - sub run
48    
49  # get logger instance  # get logger instance
50  my $logger = Log::Dispatch::Config->instance;  my $logger = eval { Log::Dispatch::Config->instance; };
51        
52    my $meta;
53    
54  ## ========   object constructor   ========  ## ========   object constructor   ========
55    sub new {    sub new {
# Line 38  my $logger = Log::Dispatch::Config->inst Line 57  my $logger = Log::Dispatch::Config->inst
57      my $class = ref($invocant) || $invocant;      my $class = ref($invocant) || $invocant;
58      my @args = ();      my @args = ();
59      @_ && (@args = @_);      @_ && (@args = @_);
60      $logger->debug( __PACKAGE__ . "->new(@args)" );      $logger->debug( __PACKAGE__ . "->new(@args)" ) if $logger;
61      my $self = { @_ };      my $self = { @_ };
62      #print "class: $class", "\n";      #print "class: $class", "\n";
63      bless $self, $class;      bless $self, $class;
# Line 61  my $logger = Log::Dispatch::Config->inst Line 80  my $logger = Log::Dispatch::Config->inst
80      my $method = $AUTOLOAD;      my $method = $AUTOLOAD;
81      $method =~ s/^.*:://;      $method =~ s/^.*:://;
82        
83      $logger->debug( __PACKAGE__ . "->" . $method . "(@_)" . " (AUTOLOAD called, not dispatched)" );      $logger->debug( __PACKAGE__ . "->" . $method . "(@_)" . " (AUTOLOAD called, not dispatched)" ) if $logger;
84    
85      ## ->DESTROY would - if not declared - trigger an AUTOLOAD also      ## ->DESTROY would - if not declared - trigger an AUTOLOAD also
86      return if $method =~ m/::DESTROY$/;      return if $method =~ m/::DESTROY$/;
# Line 72  my $logger = Log::Dispatch::Config->inst Line 91  my $logger = Log::Dispatch::Config->inst
91  ##    }  ##    }
92            
93    }    }
     
   sub load {  
94    
95      sub _getPluginPackage {
96      my $self = shift;      my $self = shift;
97        my $modulename_load = shift;
98    
99        # substitute slashes through double double-colons to load modules perl-style
100        $modulename_load =~ s/\//::/g;
101        
102        # build full package name
103      my $self_classname = ref $self;      my $self_classname = ref $self;
104        my $package = $self_classname . '::' . $modulename_load;
105        return $package;
106      }
107      
108      sub load {
109    
110        my $self = shift;
111      my $modulename_load = shift;      my $modulename_load = shift;
112    
113        my $options = shift;
114    
115        my $self_modulename = ref $self;
116        my $package = $self->_getPluginPackage($modulename_load);
117            
118      my $package = $self_classname . '::' . $modulename_load;      if ($meta->{loaded}->{$package}) {
119      $logger->info( __PACKAGE__ . "->load: $package" );        return 1;
120        }
121        
122        #$logger->info( __PACKAGE__ . "->load: $package" ) if $logger;
123        #$logger->info( __PACKAGE__ . "->load: $self_modulename" ) if $logger;
124        $logger->debug( $self_modulename . "->load: $package\t[via " . __PACKAGE__ . "]" ) if $logger;
125    
126      # 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
127      eval("use $package;");      eval("use $package;");
128      if ($@) {      if ($@) {
129        $logger->error( __PACKAGE__ . "->load: $@" );        $meta->{loaded}->{$package} = 0;
130          # include caller information
131          my @caller = caller;
132          my $caller_msg = $caller[1] . ':' . $caller[2];
133          my $msg =  __PACKAGE__ . "->load: $@ ($caller_msg)";
134          if ($logger) {
135            $logger->error($msg);
136          } else {
137            print $msg, "\n";
138          }
139      }      }
140    
141  #print "ref-1: ", ref $self, "\n";  #print "ref-1: ", ref $self, "\n";
# Line 97  my $logger = Log::Dispatch::Config->inst Line 146  my $logger = Log::Dispatch::Config->inst
146    
147      # V2:      # V2:
148      # switch into foreign package and mixin plugin-module      # switch into foreign package and mixin plugin-module
149        $self->mixinPackage($package);
150    
151        if (my $method = $options->{method}) {
152          $self->$method();
153        }
154    
155        return 1;
156        
157      }
158    
159      # TODO: maybe refactor to DesignPattern::Object? what about the '$logger'?
160      sub mixinPackage {
161        my $self = shift;
162        my $package = shift;
163        # switch into foreign package and mixin plugin-module
164        my $self_classname = ref $self;
165      eval("package $self_classname; use mixin '$package';");      eval("package $self_classname; use mixin '$package';");
166      #eval("use mixin_all '$package';");      #eval("use mixin_all '$package';");
167      if ($@) {      if ($@) {
168        $logger->error( __PACKAGE__ . "->load: $@" );        $meta->{loaded}->{$package} = 0;
169          $logger->error( __PACKAGE__ . "->load: $@" ) if $logger;
170        } else {
171          $meta->{loaded}->{$package} = 1;
172      }      }
173      }
174    
175      sub unload {
176    
177        my $self = shift;
178        my $modulename_unload = shift;
179    
180        my $package = $self->_getPluginPackage($modulename_unload);
181            
182        if ($meta->{loaded}->{$package}) {
183          $meta->{loaded}->{$package} = 0;
184          my $where = __PACKAGE__ . ':' . __LINE__;
185          $logger->debug( __PACKAGE__ . "->unload: FIXME: DESTROY object is not implemented at '$where'." ) if $logger;
186        }
187    
188    }    }
189    
190    
191    sub boot {    sub boot {
192      my $self = shift;      my $self = shift;
193      $self->_abstract_function('boot');      $self->_abstract_function('boot');
194    }    }
195      
196      sub include {
197        my $self = shift;
198        my $includefile = shift;
199        my $package = shift;
200        # TODO: do better error-detection here / prevent dies under all circumstances!
201        require $includefile;
202        $self->mixinPackage($package) if $package;
203      }
204    
205  1;  1;
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