/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.4 by joko, Fri Oct 25 11:44:44 2002 UTC revision 1.18 by joko, Fri Dec 13 21:48:07 2002 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.18  2002/12/13 21:48:07  joko
7    #  + fix to 'sub sendQuery'
8    #
9    #  Revision 1.17  2002/12/12 02:51:09  joko
10    #  + cosmetics
11    #
12    #  Revision 1.16  2002/12/11 06:54:10  joko
13    #  + fix: encapsulated object-loading inside an 'eval'
14    #
15    #  Revision 1.15  2002/12/05 13:55:21  joko
16    #  + now utilizing 'object2hash' instead of 'var_deref'
17    #  + played around with having fresh-objects - no progress....
18    #
19    #  Revision 1.14  2002/12/05 09:40:30  jonen
20    #  + added option->{destroy} at getObject for unloading all instance
21    #
22    #  Revision 1.13  2002/12/05 07:59:04  joko
23    #  + now using Tie::SecureHash as a base for the COREHANDLE
24    #  + former public COREHANDLE becomes private _COREHANDLE now
25    #  + sub getCOREHANDLE
26    #
27    #  Revision 1.12  2002/12/04 11:34:49  joko
28    #  - $schema_tangram doesn't have to be in class?
29    #
30    #  Revision 1.11  2002/12/04 08:54:08  jonen
31    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
32    #
33    #  Revision 1.10  2002/12/03 15:53:23  joko
34    #  + small bugfix regarding object hierarchy
35    #
36    #  Revision 1.9  2002/12/03 05:29:40  joko
37    #  + sub getObject
38    #  + sub getObjectAsHash
39    #
40    #  Revision 1.8  2002/12/01 22:25:51  joko
41    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
42    #
43    #  Revision 1.7  2002/12/01 04:46:19  joko
44    #  + sub eraseAll
45    #
46    #  Revision 1.6  2002/11/29 05:02:30  joko
47    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
48    #  + sub getMetaInfo
49    #  - sub existsChildNode (moved to Abstract.pm)
50    #  + sub getListUnfiltered
51    #  + sub getListFiltered
52    #  + sub createCursor
53    #  + sub createSet
54    #  + sub sendQuery
55    #
56    #  Revision 1.5  2002/11/17 06:35:18  joko
57    #  + locator metadata can now be reached via ->{locator}
58    #  - getChildNodes is now wrapped via COREHANDLE
59    #
60  #  Revision 1.4  2002/10/25 11:44:44  joko  #  Revision 1.4  2002/10/25 11:44:44  joko
61  #  + sub _initSchema  #  + sub _initSchema
62  #  + sub existsChildNode  #  + sub existsChildNode
# Line 21  Line 75 
75  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
76  #  + new  #  + new
77  #  #
78  #  ############################################
79  #################################  
80    
81  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
82    
83  use strict;  use strict;
84  use warnings;  use warnings;
85    
86    use base ("Data::Storage::Handler");
87  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
88    
89  use Tangram;  use Tangram;
90  use Data::Dumper;  use Data::Dumper;
91    use libp qw( getNewPerlObjectByPkgName );
92    use Data::Storage::Result::Tangram;
93    use Data::Compare::Struct qw( isEmpty );
94    use Data::Transform::Deep qw( object2hash );
95    use Data::Transform::Encode qw( var2utf8 );
96    
97    
98  # get logger instance  # get logger instance
99  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
100    
101    
102  our $metainfo = {  # this holds the complete instantiated schema from tangram
103    'disconnectMethod' => 'disconnect',  my $schema_tangram;
 };  
104    
105  sub getNewPerlObjectByPkgName {  sub getMetaInfo {
106    my $pkgname = shift;    my $self = shift;
107    my $args = shift;    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
108    $logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );    return {
109    my $evstring = "use $pkgname;";      'disconnectMethod' => 'disconnect',
110    eval($evstring);    };
   $@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " .  $@ );  
   return $pkgname->new($args);  
111  }  }
112    
113  sub _initSchema {  sub _initSchema {
114    my $self = shift;    my $self = shift;
115    $logger->debug( __PACKAGE__ . "->_initSchema()" );    $logger->debug( __PACKAGE__ . "->_initSchema()" );
116    #if (!$self->{schema_tangram}) {    #if (!$schema_tangram) {
117      my $obj = getNewPerlObjectByPkgName($self->{schema}, { EXPORT_OBJECTS => $self->{classnames} } );      my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
118      $self->{schema_tangram} = $obj->getSchema();      $schema_tangram = $obj->getSchema();
119    #}    #}
120    if (!$self->{schema_tangram}) {    if (!$schema_tangram) {
121      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
122      return 0;      return 0;
123    }    }
# Line 71  sub connect { Line 129  sub connect {
129      my $self = shift;      my $self = shift;
130            
131      my $dsn = shift;      my $dsn = shift;
132      $dsn ||= $self->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
133            
134      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
135            
# Line 86  sub connect { Line 144  sub connect {
144    
145      return unless $self->_initSchema();      return unless $self->_initSchema();
146    
147        # create the main tangram storage object
148      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
149      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
150    
151    #print "connect", "\n";
152    #my $core = $self->{_COREHANDLE};
153    #print Dumper($core);
154        
155        # some attempts for configuring the wrapped underlying dbi.....
156      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
157      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
158      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
159        
160        # ..... encapsulation wins!
161      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
162    
163      $self->{locator}->{status}->{connected} = 1;
164    
165    return 1;    return 1;
166    
167  }  }
# Line 108  sub getChildNodes { Line 176  sub getChildNodes {
176    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
177    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
178    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
179      
180      # todo: should we retrieve information from the schema here
181      # rather than poorly getting table names from underlying dbi?
182    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
183      @nodes = @{$storage->getChildNodes()};
184    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
185    #print "getchildnodes\n";
186    #print Dumper($self);
187    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
   if (my $result = $storage->sendCommand( 'SHOW TABLES;' ) ) {  
     while ( my $row = $result->_getNextEntry() ) {  
       push @nodes, $row;  
     }  
   }  
188        
189    $storage->disconnect();    # TODO: REVIEW
190      #$storage->disconnect();
191        
192    $self->{meta}->{childnodes} = \@nodes;    $self->{meta}->{childnodes} = \@nodes;
193        
# Line 127  sub getChildNodes { Line 196  sub getChildNodes {
196  }  }
197    
198    
 sub existsChildNode {  
   my $self = shift;  
   my $nodename = shift;  
   $logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" );  
   $self->getChildNodes() unless $self->{meta}->{childnodes};  
   return grep $nodename, @{$self->{meta}->{childnodes}};  
 }  
   
   
199  sub testIntegrity {  sub testIntegrity {
200    
201    my $self = shift;    my $self = shift;
# Line 154  sub testIntegrity { Line 214  sub testIntegrity {
214      return;      return;
215    }    }
216    
217      $self->{locator}->{status}->{integrity} = 1;
218    return 1;    return 1;
219    
220  }  }
# Line 165  sub _getSubLayerHandle { Line 226  sub _getSubLayerHandle {
226        
227    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
228    
   use Data::Dumper;  
229    #print Dumper($self);    #print Dumper($self);
230    #exit;  
     
231    # hack, make more generic!    # hack, make more generic!
232    if (!$self->{dataStorageLayer}) {    if (!$self->{dataStorageLayer}) {
233      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
234      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
235      my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi} );      my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
236      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
237      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
238      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
# Line 197  sub _configureUnderlyingStorage { Line 256  sub _configureUnderlyingStorage {
256    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
257      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
258      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
259      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
260    }    }
261    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
262  }  }
# Line 213  sub configureCOREHANDLE { Line 272  sub configureCOREHANDLE {
272    
273    # apply configured modifications    # apply configured modifications
274      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
275        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
276      }      }
277      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
278        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
279      }      }
280      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
281        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
282      }      }
283      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
284        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
285      }      }
286    
287  }  }
288    
289  sub deploySchema {  sub deploySchema {
290    my $self = shift;    my $self = shift;
291    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $args = shift;
292    my $dsn = $self->{dbi}->{dsn};    
293      my $dsn = $self->{locator}->{dbi}->{dsn};
294    
295    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
296    
297    my $ok;    my $ok;
298    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       PrintError => 0,  
                                                     } ) ) {  
   
299      return unless $self->_initSchema();      return unless $self->_initSchema();
300            $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
     $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );  
301      $dbh->disconnect();      $dbh->disconnect();
302    }    }
303    return $ok;    return $ok;
# Line 250  sub deploySchema { Line 306  sub deploySchema {
306  sub retreatSchema {  sub retreatSchema {
307    
308    my $self = shift;    my $self = shift;
309    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   my $dsn = $self->{dbi}->{dsn};  
310    
311    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
312    
313    my $ok;    my $ok;
314    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       #PrintError => 0,  
                                                       #RaiseError => 0,  
                                                     } ) ) {  
315    
316      return unless $self->_initSchema();      return unless $self->_initSchema();
317            
318      #use Data::Dumper; print Dumper($self);      #use Data::Dumper; print Dumper($self);
319      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
320            
321      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
322      $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status  
323                      # idea: test this by checking for count of tables in database -      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
324                      #          problem with this: there may be some left not having been included to the schema      # - ... Tangram::Relational->retreat doesn't seem to return a valid status
325        # - possible improvement:
326        #   - test this by checking for count of tables in database
327        #   - problem with this: there may be some left not having been included to the schema
328        #   - maybe better: use "->getChildNodes"?
329        $ok = 2;
330    
331      $dbh->disconnect();      $dbh->disconnect();
332    
333    }    }
334    return $ok;    return $ok;
335  }  }
# Line 295  sub rebuildDbAndSchema { Line 354  sub rebuildDbAndSchema {
354    return $res;    return $res;
355  }  }
356    
357    sub getListUnfiltered {
358      my $self = shift;
359      my $nodename = shift;
360      my @results;
361      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
362      # get set of objects from odbms by object name
363      my $object_set = $self->{_COREHANDLE}->remote($nodename);
364      @results = $self->{_COREHANDLE}->select($object_set);
365      return \@results;
366    }
367    
368    sub getListFiltered {
369      my $self = shift;
370    
371      # redirect to unfiltered mode
372      #return $self->getListUnfiltered(@_);
373    
374      my $nodename = shift;
375      my $filters = shift;
376      my @results;
377      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
378    
379      #print Dumper($filters);
380      
381      my @tfilters;
382      
383      foreach my $filter (@$filters) {
384      
385        # get filter - TODO: for each filter
386        #my $filter = $filters->[0];
387      
388        # build filter
389        my $lexpr = $filter->{key};
390        #my $op = $filter->{op};
391        my $op = '=';
392        my $rexpr = $filter->{val};
393        my $tight = 100;
394        
395      #  my $tfilter = Tangram::Filter->new(
396      #    expr => "t1.$lexpr $op '$rexpr'",
397      #    tight => $tight,
398      #    objects => $objects,
399      #  );
400      
401        # HACK: build eval-string (sorry) to get filtered list - please give advice here
402        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
403    
404      }
405    
406      my $tfilter = join(' & ', @tfilters);
407    
408      # get set of objects from odbms by object name
409      my $remote = $self->{_COREHANDLE}->remote($nodename);
410      
411      # was:
412      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
413    
414      # is:
415      # HACK: build eval-string (sorry) to get filtered list - please give advice here
416      my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
417      
418      # get filtered list/set
419      @results = eval($evalstring);
420      die $@ if $@;
421      
422      return \@results;
423    }
424    
425    sub createCursor {
426      my $self = shift;
427      my $node = shift;
428      my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
429      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
430      return $result;
431    }
432    
433    sub createSet {
434      my $self = shift;
435    #print "-" x 80, "\n";
436    #print Dumper(@_);
437      my @objects = @_;
438      my $rh = Set::Object->new();
439      foreach (@objects) {
440        if (!isEmpty($_)) {
441    #print Dumper($_);
442          $rh->insert($_);
443        }
444      }
445      #print Dumper($rh->members());
446      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
447      return $result;
448    }
449    
450    sub sendQuery {
451      my $self = shift;
452      my $query = shift;
453      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
454      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
455    
456      #print Dumper($query);
457    
458      # HACK: special case: querying by id does not translate into a common tangram query
459      # just load the object by given id(ent)
460      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
461        #print "LOAD!!!", "\n";
462        #exit;
463        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
464        my $ident = $query->{criterias}->[0]->{val};
465    #print "load obj", "\n";
466        #return $self->createSet() if $ident == 5;
467        $self->{_COREHANDLE}->unload($ident);
468        my $object = $self->{_COREHANDLE}->load($ident);
469    #print "get id", "\n";
470        my $oid = $self->{_COREHANDLE}->id($object);
471    #print Dumper($object);
472    #print "oid: $oid", "\n";
473        return $self->createSet($object);
474        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
475      }
476    
477      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
478    
479      # TODO: do a common tangram query here
480    
481      my @crits;
482      foreach (@{$query->{criterias}}) {
483        my $op = '';
484        $op = '=' if lc $_->{op} eq 'eq';
485        push @crits, "$_->{key}$op'$_->{val}'";
486      }
487      my $subnodes = {};
488      map { $subnodes->{$_}++ } @{$query->{subnodes}};
489      # HACK: this is hardcoded ;(    expand possibilities!
490      #my $crit = join(' AND ', @crits);
491      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
492      #return $self->sendCommand($sql);
493      #my $h = $self->{COREHANDLE}->remote($query->{node});
494      #my $res = $self->{COREHANDLE}->select($h, $h->{);
495      return $self->createCursor($query->{node});
496    }
497    
498    sub eraseAll {
499      my $self = shift;
500      my $classname = shift;
501      my $remote = $self->{_COREHANDLE}->remote($classname);
502      my @objs = $self->{_COREHANDLE}->select($remote);
503      $self->{_COREHANDLE}->erase(@objs);
504    }
505    
506    sub createDb {
507      my $self = shift;
508      my $storage = $self->_getSubLayerHandle();
509      return $storage->createDb();
510    }
511    
512    sub getObject {
513      my $self = shift;
514      my $oid = shift;
515      my $options = shift;
516    
517      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
518      # unload($oid) will only unload object, not deep object hashes
519      $self->{_COREHANDLE}->unload() if ($options->{destroy});
520    
521      # TODO: review this
522      #if (!$self->{COREHANDLE}) { return; }
523    
524      # TODO: review this
525      my $object = eval('$self->{_COREHANDLE}->load($oid);');
526      print $@, "\n" if $@;
527    
528      return $object if $object;
529    }
530    
531    sub getObjectAsHash {
532      my $self = shift;
533      my $oid = shift;
534      my $options = shift;
535      my $obj = $self->getObject($oid, $options);
536      
537      # build options (a callback to unload autovivified objects) for 'expand'
538      # TODO: use $logger to write to debug here!
539      my $cb; # = sub {};
540    =pod
541      if ($options->{destroy}) {
542        $options->{cb}->{destroy} = sub {
543          print "================ DESTROY", "\n";
544          my $object = shift;
545          #print Dumper($object);
546          $self->{_COREHANDLE}->unload($object);
547          #undef($object);
548        };
549      }
550    =cut
551    
552      my $hash = object2hash($obj, $options);
553      #$options->{cb}->{destroy}->($obj);
554      #$self->{_COREHANDLE}->unload($obj);
555      
556      # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML
557      # now done in object2hash
558      #var2utf8($hash) if ($options->{utf8});
559      
560      # old (wrong) attempts to get rid of used instances, if requested
561        #$obj->clear_refs;
562        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
563        #$obj->DESTROY;
564        #undef($obj) if($options->{destroy});
565      
566      return $hash;
567    }
568    
569    sub getSchema {
570      return $schema_tangram;
571    }
572    
573    sub getCOREHANDLE {
574      my $self = shift;
575      return $self->{_COREHANDLE};
576    }
577    
578  1;  1;
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