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revision 1.12 by joko, Thu Dec 12 02:50:15 2002 UTC revision 1.18 by joko, Thu Jan 30 22:12:17 2003 UTC
# Line 1  Line 1 
1  # $Id$  ## ------------------------------------------------------------------------
2  #  ##
3  # Copyright (c) 2002  Andreas Motl <andreas.motl@ilo.de>  ##    $Id$
4  #  ##
5  # See COPYRIGHT section in pod text below for usage and distribution rights.  ##    Copyright (c) 2002  Andreas Motl <andreas.motl@ilo.de>
6  #  ##
7  ############################################  ##    See COPYRIGHT section in pod text below for usage and distribution rights.
8  #  ##
9  #  $Log$  ## ------------------------------------------------------------------------
10  #  Revision 1.12  2002/12/12 02:50:15  joko  ##
11  #  + this now (unfortunately) needs DBI for some helper functions  ##  $Log$
12  #  + TODO: these have to be refactored to another scope! (soon!)  ##  Revision 1.18  2003/01/30 22:12:17  joko
13  #  ##  - removed/refactored old code: ->Data::Storage::Handler::Tangram|DBI
14  #  Revision 1.11  2002/12/11 06:53:19  joko  ##
15  #  + updated pod  ##  Revision 1.17  2003/01/30 21:42:22  joko
16  #  ##  + minor update: renamed method
17  #  Revision 1.10  2002/12/07 03:37:23  joko  ##
18  #  + updated pod  ##  Revision 1.16  2003/01/20 16:52:13  joko
19  #  ##  + now using 'DesignPattern::Object' to create a new 'Data::Storage::Handler::Xyz' on demand - before we did this in a hand-rolled fashion
20  #  Revision 1.9  2002/12/01 22:15:45  joko  ##
21  #  - sub createDb: moved to handler  ##  Revision 1.15  2003/01/19 03:12:59  joko
22  #  ##  + modified header
23  #  Revision 1.8  2002/11/29 04:48:23  joko  ##  - removed pod-documentation - now in 'Storage.pod'
24  #  + updated pod  ##
25  #  ##  Revision 1.14  2002/12/19 16:27:59  joko
26  #  Revision 1.7  2002/11/17 06:07:18  joko  ##  - moved 'sub dropDb' to Data::Storage::Handler::DBI
27  #  + creating the handler is easier than proposed first - for now :-)  ##
28  #  + sub testAvailability  ##  Revision 1.13  2002/12/17 21:54:12  joko
29  #  ##  + feature when using Tangram:
30  #  Revision 1.6  2002/11/09 01:04:58  joko  ##    + what? each object created should delivered with a globally(!?) unique identifier (GUID) besides the native tangram object id (OID)
31  #  + updated pod  ##        + patched Tangram::Storage (jonen)
32  #  ##        + enhanced Data::Storage::Schema::Tangram (joko)
33  #  Revision 1.5  2002/10/29 19:24:18  joko  ##        + enhanced Data::Storage::Handler::Tangram 'sub getObjectByGuid' (jonen)
34  #  - reduced logging  ##    + how?
35  #  + added some pod  ##        + each concrete (non-abstract) class gets injected with an additional field/property called 'guid' - this is done (dynamically) on schema level
36  #  ##        + this property ('guid') gets filled on object creation/insertion from 'sub Tangram::Storage::_insert' using Data::UUID from CPAN
37  #  Revision 1.4  2002/10/27 18:35:07  joko  ##        + (as for now) this property can get accessed by calling 'getObjectByGuid' on the already known storage-handle used throughout the application
38  #  + added pod  ##
39  #  ##  Revision 1.12  2002/12/12 02:50:15  joko
40  #  Revision 1.3  2002/10/25 11:40:37  joko  ##  + this now (unfortunately) needs DBI for some helper functions
41  #  + enhanced robustness  ##  + TODO: these have to be refactored to another scope! (soon!)
42  #  + more logging for debug-levels  ##
43  #  + sub dropDb  ##  Revision 1.11  2002/12/11 06:53:19  joko
44  #  ##  + updated pod
45  #  Revision 1.2  2002/10/17 00:04:29  joko  ##
46  #  + sub createDb  ##  Revision 1.10  2002/12/07 03:37:23  joko
47  #  + sub isConnected  ##  + updated pod
48  #  + bugfixes regarding "deep recursion" stuff  ##
49  #  ##  Revision 1.9  2002/12/01 22:15:45  joko
50  #  Revision 1.1  2002/10/10 03:43:12  cvsjoko  ##  - sub createDb: moved to handler
51  #  + new  ##
52  #  ##  Revision 1.8  2002/11/29 04:48:23  joko
53  ############################################  ##  + updated pod
54    ##
55    ##  Revision 1.7  2002/11/17 06:07:18  joko
56    ##  + creating the handler is easier than proposed first - for now :-)
57    ##  + sub testAvailability
58    ##
59    ##  Revision 1.6  2002/11/09 01:04:58  joko
60    ##  + updated pod
61    ##
62    ##  Revision 1.5  2002/10/29 19:24:18  joko
63    ##  - reduced logging
64    ##  + added some pod
65    ##
66    ##  Revision 1.4  2002/10/27 18:35:07  joko
67    ##  + added pod
68    ##
69    ##  Revision 1.3  2002/10/25 11:40:37  joko
70    ##  + enhanced robustness
71    ##  + more logging for debug-levels
72    ##  + sub dropDb
73    ##
74    ##  Revision 1.2  2002/10/17 00:04:29  joko
75    ##  + sub createDb
76    ##  + sub isConnected
77    ##  + bugfixes regarding "deep recursion" stuff
78    ##
79    ##  Revision 1.1  2002/10/10 03:43:12  cvsjoko
80    ##  + new
81    ## ------------------------------------------------------------------------
82    
83    
84  BEGIN {  BEGIN {
85    $Data::Storage::VERSION = 0.02;    $Data::Storage::VERSION = 0.03;
86  }  }
87    
   
 =head1 NAME  
   
   Data::Storage - Interface for accessing various Storage implementations for Perl in an independent way  
   
   
 =head1 AIMS  
   
   - should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary (more convenient) way ;)  
   - introduce a generic layered structure, refactor *SUBLAYER*-stuff, make (e.g.) this possible:  
     Perl Data::Storage[DBD::CSV]  ->  Perl LWP::  ->  Internet HTTP/FTP/*  ->  Host Daemon  ->  csv-file  
   - provide generic synchronization mechanisms across arbitrary/multiple storages based on ident/checksum  
     maybe it's possible to have schema-, structural- and semantical modifications synchronized???  
   
   
 =head1 SYNOPSIS  
   
 =head2 BASIC ACCESS  
   
 =head2 ADVANCED ACCESS  
   
   ... via inheritance:  
     
     use Data::Storage;  
     my $proxyObj = new HttpProxy;  
     $proxyObj->{url} = $url;  
     $proxyObj->{payload} = $content;  
     $self->{storage}->insert($proxyObj);  
       
     use Data::Storage;  
     my $proxyObj = HttpProxy->new(  
       url => $url,  
       payload => $content,  
     );  
     $self->{storage}->insert($proxyObj);  
   
   
 =head2 SYNCHRONIZATION  
   
   my $nodemapping = {  
     'LangText' => 'langtexts.csv',  
     'Currency' => 'currencies.csv',  
     'Country'  => 'countries.csv',  
   };  
   
   my $propmapping = {  
     'LangText' => [  
       [ 'source:lcountrykey'  =>  'target:country' ],  
       [ 'source:lkey'         =>  'target:key' ],  
       [ 'source:lvalue'       =>  'target:text' ],  
     ],  
     'Currency' => [  
       [ 'source:ckey'         =>  'target:key' ],  
       [ 'source:cname'        =>  'target:text' ],  
     ],  
     'Country' => [  
       [ 'source:ckey'         =>  'target:key' ],  
       [ 'source:cname'        =>  'target:text' ],  
     ],  
   };  
   
   sub syncResource {  
   
     my $self = shift;  
     my $node_source = shift;  
     my $mode = shift;  
     my $opts = shift;  
       
     $mode ||= '';  
     $opts->{erase} ||= 0;  
       
     $logger->info( __PACKAGE__ . "->syncResource( node_source $node_source mode $mode erase $opts->{erase} )");  
     
     # resolve metadata for syncing requested resource  
     my $node_target = $nodemapping->{$node_source};  
     my $mapping = $propmapping->{$node_source};  
       
     if (!$node_target || !$mapping) {  
       # loggger.... "no target, sorry!"  
       print "error while resolving resource metadata", "\n";  
       return;  
     }  
       
     if ($opts->{erase}) {  
       $self->_erase_all($node_source);  
     }  
     
     # create new sync object  
     my $sync = Data::Transfer::Sync->new(  
       storages => {  
         L => $self->{bizWorks}->{backend},  
         R => $self->{bizWorks}->{resources},  
       },  
       id_authorities        =>  [qw( L ) ],  
       checksum_authorities  =>  [qw( L ) ],  
       write_protected       =>  [qw( R ) ],  
       verbose               =>  1,  
     );  
       
     # sync  
     # todo: filter!?  
     $sync->syncNodes( {  
       direction       =>  $mode,                 # | +PUSH | +PULL | -FULL | +IMPORT | -EXPORT  
       method          =>  'checksum',            # | -timestamp | -manual  
       source          =>  "L:$node_source",  
       source_ident    =>  'storage_method:id',  
       source_exclude  =>  [qw( id cs )],  
       target          =>  "R:$node_target",  
       target_ident    =>  'property:oid',  
       mapping         =>  $mapping,  
     } );  
   
   }  
   
   
 =head2 NOTE  
   
   This module heavily relies on DBI and Tangram, but adds a lot of additional bugs and quirks.  
   Please look at their documentation and/or this code for additional information.  
   
   
 =head1 REQUIREMENTS  
   
   For full functionality:  
     DBI              from CPAN  
     DBD::mysql       from CPAN  
     Tangram 2.04     from CPAN         (hmmm, 2.04 won't do in some cases)  
     Tangram 2.05     from http://...   (2.05 seems okay but there are also additional patches from our side)  
     Class::Tangram   from CPAN  
     DBD::CSV         from CPAN  
     MySQL::Diff      from http://adamspiers.org/computing/mysqldiff/  
     ... and all their dependencies  
   
 =cut  
   
 # The POD text continues at the end of the file.  
   
   
88  package Data::Storage;  package Data::Storage;
89    
90  use strict;  use strict;
91  use warnings;  use warnings;
92    
 use Data::Storage::Locator;  
93  use Data::Dumper;  use Data::Dumper;
94    # FIXME: wipe out!
 # TODO: wipe out!  
95  use DBI;  use DBI;
96    
97    use Data::Storage::Locator;
98    use DesignPattern::Object;
99    
100    
101  # TODO: actually implement level (integrate with Log::Dispatch)  # TODO: actually implement level (integrate with Log::Dispatch)
102  my $TRACELEVEL = 0;  my $TRACELEVEL = 0;
103    
# Line 220  sub new { Line 112  sub new {
112    my $arg_locator = shift;    my $arg_locator = shift;
113    my $arg_options = shift;    my $arg_options = shift;
114    
115      if (!$arg_locator) {
116        $logger->critical( __PACKAGE__ . "->new: No locator passed in!" );
117        return;
118      }
119    
120    #my $self = { STORAGEHANDLE => undef, @_ };    #my $self = { STORAGEHANDLE => undef, @_ };
121    my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };    my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };
122    #$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );    #$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );
# Line 247  sub AUTOLOAD { Line 144  sub AUTOLOAD {
144    
145    # advanced logging of AUTOLOAD calls ...    # advanced logging of AUTOLOAD calls ...
146    # ... nice but do it only when TRACING (TODO) is enabled    # ... nice but do it only when TRACING (TODO) is enabled
     if ($TRACELEVEL) {  
147        my $logstring = "";        my $logstring = "";
148        $logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method;        $logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method;
149        #print "count: ", $#_, "\n";        #print "count: ", $#_, "\n";
# Line 257  sub AUTOLOAD { Line 153  sub AUTOLOAD {
153        # TODO: only ok if logstring doesn't contain        # TODO: only ok if logstring doesn't contain
154        #            e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c))          (AUTOLOAD)"        #            e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c))          (AUTOLOAD)"
155        # but that would be _way_ too specific as long as we don't have an abstract handler for this  ;)        # but that would be _way_ too specific as long as we don't have an abstract handler for this  ;)
156        if ($TRACELEVEL) {
157        $logger->debug( $logstring );        $logger->debug( $logstring );
158        #print join('; ', @_);        #print join('; ', @_);
159      }      }
160            
161    # filtering AUTOLOAD calls and first-time-touch of the actual storage impl    # filtering AUTOLOAD calls and first-time-touch of the actual storage impl
162    if ($self->_filter_AUTOLOAD($method)) {    if ($self->_filter_AUTOLOAD($method)) {
163      #print "_accessStorage\n";      #print "=== FILTER!", "\n";
164      $self->_accessStorage();      $self->_accessStorageHandle();
165      $self->{STORAGEHANDLE}->$method(@_);      if ($self->{STORAGEHANDLE}) {
166          return $self->{STORAGEHANDLE}->$method(@_);
167        } else {
168          $logger->critical( __PACKAGE__ . "->AUTOLOAD: ERROR: " . $logstring );
169          return;
170        }
171    }    }
172        
173  }  }
# Line 282  sub _filter_AUTOLOAD { Line 184  sub _filter_AUTOLOAD {
184  }  }
185    
186    
187  sub normalizeArgs {  sub _accessStorageHandle {
   my %args = @_;  
   if (!$args{dsn} && $args{meta}{dsn}) {  
     $args{dsn} = $args{meta}{dsn};  
   }  
   my @result = %args;  
   return @result;  
 }  
   
 sub _accessStorage {  
188    my $self = shift;    my $self = shift;
189    # TODO: to some tracelevel!    # TODO: to some tracelevel!
190      #print "=========== _accessStorage", "\n";
191    if ($TRACELEVEL) {    if ($TRACELEVEL) {
192      $logger->debug( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->_accessStorage()" );      $logger->debug( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->_accessStorageHandle()" );
193    }    }
194    if (!$self->{STORAGEHANDLE}) {    if (!$self->{STORAGEHANDLE}) {
195      $self->_createStorageHandle();      return $self->_createStorageHandle();
196    }    }
197  }  }
198    
199    sub _createStorageHandle1 {
200      my $self = shift;
201      my $type = $self->{locator}->{type};
202      $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );
203    
204      my $pkg = "Data::Storage::Handler::" . $type . "";
205      
206      # try to load perl module at runtime
207      my $evalstr = "use $pkg;";
208      eval($evalstr);
209      if ($@) {
210        $logger->error( __PACKAGE__ .  "[$type]" . "->_createStorageHandle(): $@" );
211        return;
212      }
213      
214      # build up some additional arguments to pass on
215      #my @args = %{$self->{locator}};
216      my @args = ();
217    
218      # - create new storage handle object
219      # - propagate arguments to handler
220      # - pass locator by reference to be able to store status- or meta-information in it
221      $self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args );
222    
223    }
224    
225  sub _createStorageHandle {  sub _createStorageHandle {
226    my $self = shift;    my $self = shift;
227    my $type = $self->{locator}->{type};    my $type = $self->{locator}->{type};
228    $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );    $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );
229    
230    #print Dumper($self);
231    #exit;
232    
233    my $pkg = "Data::Storage::Handler::" . $type . "";    my $pkg = "Data::Storage::Handler::" . $type . "";
234        
235    # try to load perl module at runtime    # try to load perl module at runtime
236    =pod
237    my $evalstr = "use $pkg;";    my $evalstr = "use $pkg;";
238    eval($evalstr);    eval($evalstr);
239    if ($@) {    if ($@) {
# Line 325  sub _createStorageHandle { Line 249  sub _createStorageHandle {
249    # - propagate arguments to handler    # - propagate arguments to handler
250    # - pass locator by reference to be able to store status- or meta-information in it    # - pass locator by reference to be able to store status- or meta-information in it
251    $self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args );    $self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args );
252    =cut
253    
254      $self->{STORAGEHANDLE} = DesignPattern::Object->fromPackage( $pkg, locator => $self->{locator} );
255      return 1;
256    
257  }  }
258    
# Line 363  sub removeLogDispatchHandler { Line 291  sub removeLogDispatchHandler {
291    $logger->remove($name);    $logger->remove($name);
292  }  }
293    
 sub getDbName {  
   my $self = shift;  
   my $dsn = $self->{locator}->{dbi}->{dsn};  
   $dsn =~ m/database=(.+?);/;  
   my $database_name = $1;  
   return $database_name;  
 }  
   
 sub testAvailability {  
   my $self = shift;  
   my $status = $self->testDsn();  
   $self->{locator}->{status}->{available} = $status;  
   return $status;  
 }  
   
 sub isConnected {  
   my $self = shift;  
   # TODO: REVIEW!  
   return 1 if $self->{STORAGEHANDLE};  
 }  
   
 sub testDsn {  
   my $self = shift;  
   my $dsn = $self->{locator}->{dbi}->{dsn};  
   my $result;  
   if ( my $dbh = DBI->connect($dsn, '', '', {  
                                                       PrintError => 0,  
                                                       } ) ) {  
       
     # TODO: REVIEW  
     $dbh->disconnect();  
       
     return 1;  
   } else {  
     $logger->warning( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr );  
   }  
 }  
   
 sub dropDb {  
   my $self = shift;  
   my $dsn = $self->{locator}->{dbi}->{dsn};  
   
   $logger->debug( __PACKAGE__ .  "->dropDb( dsn $dsn )" );  
   
   $dsn =~ s/database=(.+?);//;  
   my $database_name = $1;  
   
   my $ok;  
     
   if ( my $dbh = DBI->connect($dsn, '', '', {  
                                                       PrintError => 0,  
                                                       } ) ) {  
     if ($database_name) {  
       if ($dbh->do("DROP DATABASE $database_name;")) {  
         $ok = 1;  
       }  
     }  
   
     $dbh->disconnect();  
   
   }  
     
   return $ok;  
 }  
294    
295  1;  1;
296  __END__  __END__
   
   
 =head1 DESCRIPTION  
   
 =head2 Data::Storage  
   
   Data::Storage is a module for accessing various "data structures / kinds of structured data" stored inside  
   various "data containers".  
   We tried to use the AdapterPattern (http://c2.com/cgi/wiki?AdapterPattern) to implement a wrapper-layer  
   around core CPAN modules (Tangram, DBI).  
   
 =head2 Why?  
   
   You will get a better code-structure (not bad for later maintenance) in growing Perl code projects,  
   especially when using multiple database connections at the same time.  
   You will be able to switch between different _kinds_ of implementations used for storing data.  
   Your code will use the very same API to access these storage layers.  
       ... implementation has to be changed for now  
   Maybe you will be able to switch "on-the-fly" without changing any bits in code in the future....  
       ... but that's not the focus  
   
 =head2 What else?  
   
   Having this, we were able to do implement a generic data synchronization module more easy,  
   please look at Data::Transfer.  
   
   
 =head1 AUTHORS / COPYRIGHT  
   
   The Data::Storage module is Copyright (c) 2002 Andreas Motl.  
   All rights reserved.  
   You may distribute it under the terms of either the GNU General Public  
   License or the Artistic License, as specified in the Perl README file.  
   
   
 =head1 ACKNOWLEDGEMENTS  
   
   Larry Wall for Perl, Tim Bunce for DBI, Jean-Louis Leroy for Tangram and Set::Object,  
   Sam Vilain for Class::Tangram, Jochen Wiedmann and Jeff Zucker for DBD::CSV & Co.,  
   Adam Spiers for MySQL::Diff and all contributors.  
   
   
 =head1 SUPPORT / WARRANTY  
   
   Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND.  
   
   
 =head1 TODO  
   
   
 =head2 BUGS  
   
 "DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'"  
   
   ... occours when operating on object-attributes not introduced yet:  
   this should be detected and appended/replaced through:  
   "Schema-Error detected, maybe (just) an inconsistency.  
   Please check if your declaration in schema-module "a" matches structure in database "b" or try to run"  
   db_setup.pl --dbkey=import --action=deploy  
   
   
 Compare schema (structure diff) with database ...  
   
   ... when issuing "db_setup.pl --dbkey=import --action=deploy"  
   on a database with an already deployed schema, use an additional "--update" then  
   to lift the schema inside the database to the current declared schema.  
   You will have to approve removals and changes on field-level while  
   new objects and new fields are introduced silently without any interaction needed.  
   In future versions there may be additional options to control silent processing of  
   removals and changes.  
   See this CRUD-table applying to the actions occouring on Classes and Class variables when deploying schemas,  
   don't mix this up with CRUD-actions on Objects, these are already handled by (e.g.) Tangram itself.  
   Classes:  
     C create    ->  yes, handled automatically  
     R retrieve  ->  no, not subject of this aspect since it is about deployment only  
     U update    ->  yes, automatically for Class meta-attributes, yes/no for Class variables (look at the rules down here)  
     D delete    ->  yes, just by user-interaction  
   Class variables:  
     C create    ->  yes, handled automatically  
     R retrieve  ->  no, not subject of this aspect since it is about deployment only  
     U update    ->  yes, just by user-interaction; maybe automatically if it can be determined that data wouldn't be lost  
     D delete    ->  yes, just by user-interaction  
     
   It's all about not to be able to loose data simply while this is in pre-alpha stage.  
   And loosing data by being able to modify and redeploy schemas easily is definitely quite easy.  
     
   As we can see, creations of Classes and new Class variables is handled  
   automatically and this is believed to be the most common case under normal circumstances.  
   
   
 =head2 FEATURES  
   
   - Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG.  
   - Make it possible to load/save schemas in XMI (XML Metadata Interchange),  
     which seems to be most commonly used today, perhaps handle objects with OIFML.  
     Integrate/bundle this with a web-/html-based UML modeling tool or  
     some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based)  
   - Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers.  
   - Add support for some more handlers/locators to be able to  
      access the following standards/protocols/interfaces/programs/apis transparently:  
     +  DBD::CSV (via Data::Storage::Handler::DBI)  
    (-) Text::CSV, XML::CSV, XML::Excel  
     -  MAPI  
     -  LDAP  
     -  DAV (look at PerlDAV: http://www.webdav.org/perldav/)  
     -  Mbox (use formail for seperating/splitting entries/nodes)  
     -  Cyrus (cyrdeliver - what about cyrretrieve (export)???)  
     -  use File::DiffTree, use File::Compare  
     -  Hibernate  
     -  "Win32::UserAccountDb"  
     -  "*nix::UserAccountDb"  
     -  .wab - files (Windows Address Book)  
     -  .pst - files (Outlook Post Storage?)  
     -  XML (e.g. via XML::Simple?)  
   - Move to t3, look at InCASE  
   - some kind of security layer for methods/objects  
     - acls (stored via tangram/ldap?) for functions, methods and objects (entity- & data!?)  
     - where are the hooks needed then?  
       - is Data::Storage & Co. okay, or do we have to touch the innards of DBI and/or Tangram?  
       - an attempt to start could be:  
          - 'sub getACLByObjectId($id, $context)'  
          - 'sub getACLByMethodname($id, $context)'  
          - 'sub getACLByName($id, $context)'  
             ( would require a kinda registry to look up these very names pointing to arbitrary locations (code, data, ...) )  
   
   
   
 =head3 LINKS / REFERENCES  
   
   Specs:  
     UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf  
     XMI 1.1 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf  
     XMI 2.0 Spec: http://cgi.omg.org/docs/ad/01-06-12.pdf  
     ODMG: http://odmg.org/  
     OIFML: http://odmg.org/library/readingroom/oifml.pdf  
   
   CASE Tools:  
     Rational Rose (commercial): http://www.rational.com/products/rose/  
     Together (commercial): http://www.oi.com/products/controlcenter/index.jsp  
     InCASE - Tangram-based Universal Object Editor  
     Sybase PowerDesigner: http://www.sybase.com/powerdesigner  
     
   UML Editors:  
     Fujaba (free, university): http://www.fujaba.de/  
     ArgoUML (free): http://argouml.tigris.org/  
     Poseidon (commercial): http://www.gentleware.com/products/poseidonDE.php3  
     Co-operative UML Editor (research): http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html  
     Metamill (commercial): http://www.metamill.com/  
     Violet (university, research, education): http://www.horstmann.com/violet/  
     PyUt (free): http://pyut.sourceforge.net/  
     (Dia (free): http://www.lysator.liu.se/~alla/dia/)  
     UMLet (free, university): http://www.swt.tuwien.ac.at/umlet/index.html  
     Voodoo (free): http://voodoo.sourceforge.net/  
     Umbrello UML Modeller: http://uml.sourceforge.net/  
   
   UML Tools:  
     http://www.objectsbydesign.com/tools/umltools_byPrice.html  
   
   Further readings:  
     http://www.google.com/search?q=web+based+uml+editor&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N  
     http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf  
     http://www.enhyper.com/src/documentation/  
     http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf  
     http://citeseer.nj.nec.com/vilain00diagrammatic.html  
     http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp  
   
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