--- nfo/perl/libs/DesignPattern/Bridge.pm	2002/12/15 02:06:15	1.2
+++ nfo/perl/libs/DesignPattern/Bridge.pm	2003/01/20 16:55:15	1.4
@@ -1,7 +1,14 @@
 ## --------------------------------------------------------------------------------
-##  $Id: Bridge.pm,v 1.2 2002/12/15 02:06:15 joko Exp $
+##  $Id: Bridge.pm,v 1.4 2003/01/20 16:55:15 joko Exp $
 ## --------------------------------------------------------------------------------
 ##  $Log: Bridge.pm,v $
+##  Revision 1.4  2003/01/20 16:55:15  joko
+##  + sub mixinPackage
+##  + sub include
+##
+##  Revision 1.3  2002/12/16 19:57:12  joko
+##  + sub unload
+##
 ##  Revision 1.2  2002/12/15 02:06:15  joko
 ##  + feature to be able to specify module in non-perl-style when loading plugins: e.g. $process->load('Setup/Storage')
 ##
@@ -36,6 +43,7 @@
 # get logger instance
 my $logger = Log::Dispatch::Config->instance;
   
+my $meta;
 
 ## ========   object constructor   ========
   sub new {
@@ -77,23 +85,40 @@
 ##    }
     
   }
-  
-  sub load {
 
+  sub _getPluginPackage {
     my $self = shift;
-    my $self_classname = ref $self;
-
     my $modulename_load = shift;
-    
+
     # substitute slashes through double double-colons to load modules perl-style
     $modulename_load =~ s/\//::/g;
     
+    # build full package name
+    my $self_classname = ref $self;
     my $package = $self_classname . '::' . $modulename_load;
-    $logger->info( __PACKAGE__ . "->load: $package" );
+    return $package;
+  }
+  
+  sub load {
+
+    my $self = shift;
+    my $modulename_load = shift;
+
+    my $self_modulename = ref $self;
+    my $package = $self->_getPluginPackage($modulename_load);
+    
+    if ($meta->{loaded}->{$package}) {
+      return 1;
+    }
+    
+    #$logger->info( __PACKAGE__ . "->load: $package" );
+    #$logger->info( __PACKAGE__ . "->load: $self_modulename" );
+    $logger->debug( $self_modulename . "->load: $package\t[via " . __PACKAGE__ . "]" );
 
     # this is the module testing phase - use mixin doesn't seem to propagate errors by default
     eval("use $package;");
     if ($@) {
+      $meta->{loaded}->{$package} = 0;
       # include caller information
       my @caller = caller;
       my $caller_msg = $caller[1] . ':' . $caller[2];
@@ -108,17 +133,56 @@
 
     # V2:
     # switch into foreign package and mixin plugin-module
+    $self->mixinPackage($package);
+
+    return 1;
+    
+  }
+
+  # TODO: maybe refactor to DesignPattern::Object? what about the '$logger'?
+  sub mixinPackage {
+    my $self = shift;
+    my $package = shift;
+    # switch into foreign package and mixin plugin-module
+    my $self_classname = ref $self;
     eval("package $self_classname; use mixin '$package';");
     #eval("use mixin_all '$package';");
     if ($@) {
+      $meta->{loaded}->{$package} = 0;
       $logger->error( __PACKAGE__ . "->load: $@" );
+    } else {
+      $meta->{loaded}->{$package} = 1;
     }
+  }
+
+  sub unload {
+
+    my $self = shift;
+    my $modulename_unload = shift;
+
+    my $package = $self->_getPluginPackage($modulename_unload);
     
+    if ($meta->{loaded}->{$package}) {
+      $meta->{loaded}->{$package} = 0;
+      my $where = __PACKAGE__ . ':' . __LINE__;
+      $logger->debug( __PACKAGE__ . "->unload: FIXME: DESTROY object is not implemented at '$where'." );
+    }
+
   }
 
+
   sub boot {
     my $self = shift;
     $self->_abstract_function('boot');
   }
+  
+  sub include {
+    my $self = shift;
+    my $includefile = shift;
+    my $package = shift;
+    # TODO: do better error-detection here / prevent dies under all circumstances!
+    require $includefile;
+    $self->mixinPackage($package) if $package;
+  }
 
 1;