/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.1 by cvsjoko, Thu Oct 10 03:44:07 2002 UTC revision 1.20 by jonen, Mon Dec 16 20:49:17 2002 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.20  2002/12/16 20:49:17  jonen
7    #  + added sub 'getObjectByGuid()'
8    #  + added functionality to use 'getObjectByGuid' at 'getObjectAsHash()'
9    #
10    #  Revision 1.19  2002/12/16 06:46:09  joko
11    #  + attempt to introduce a generic '_patchSchema' - cancelled!
12    #
13    #  Revision 1.18  2002/12/13 21:48:07  joko
14    #  + fix to 'sub sendQuery'
15    #
16    #  Revision 1.17  2002/12/12 02:51:09  joko
17    #  + cosmetics
18    #
19    #  Revision 1.16  2002/12/11 06:54:10  joko
20    #  + fix: encapsulated object-loading inside an 'eval'
21    #
22    #  Revision 1.15  2002/12/05 13:55:21  joko
23    #  + now utilizing 'object2hash' instead of 'var_deref'
24    #  + played around with having fresh-objects - no progress....
25    #
26    #  Revision 1.14  2002/12/05 09:40:30  jonen
27    #  + added option->{destroy} at getObject for unloading all instance
28    #
29    #  Revision 1.13  2002/12/05 07:59:04  joko
30    #  + now using Tie::SecureHash as a base for the COREHANDLE
31    #  + former public COREHANDLE becomes private _COREHANDLE now
32    #  + sub getCOREHANDLE
33    #
34    #  Revision 1.12  2002/12/04 11:34:49  joko
35    #  - $schema_tangram doesn't have to be in class?
36    #
37    #  Revision 1.11  2002/12/04 08:54:08  jonen
38    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
39    #
40    #  Revision 1.10  2002/12/03 15:53:23  joko
41    #  + small bugfix regarding object hierarchy
42    #
43    #  Revision 1.9  2002/12/03 05:29:40  joko
44    #  + sub getObject
45    #  + sub getObjectAsHash
46    #
47    #  Revision 1.8  2002/12/01 22:25:51  joko
48    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
49    #
50    #  Revision 1.7  2002/12/01 04:46:19  joko
51    #  + sub eraseAll
52    #
53    #  Revision 1.6  2002/11/29 05:02:30  joko
54    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
55    #  + sub getMetaInfo
56    #  - sub existsChildNode (moved to Abstract.pm)
57    #  + sub getListUnfiltered
58    #  + sub getListFiltered
59    #  + sub createCursor
60    #  + sub createSet
61    #  + sub sendQuery
62    #
63    #  Revision 1.5  2002/11/17 06:35:18  joko
64    #  + locator metadata can now be reached via ->{locator}
65    #  - getChildNodes is now wrapped via COREHANDLE
66    #
67    #  Revision 1.4  2002/10/25 11:44:44  joko
68    #  + sub _initSchema
69    #  + sub existsChildNode
70    #  + sub testIntegrity
71    #  + sub rebuildDbAndSchema
72    #
73    #  Revision 1.3  2002/10/17 03:56:55  joko
74    #  + bugfix: trapped eval error
75    #
76    #  Revision 1.2  2002/10/17 00:10:05  joko
77    #  + removed dependency from tsobj.pm, schema is now independent
78    #  + sub getNewPerlObjectByPkgName
79    #  + sub deploySchema
80    #  + sub retreatSchema
81    #
82  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
83  #  + new  #  + new
84  #  #
85  #  ############################################
86  #################################  
87    
88  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
89    
90  use strict;  use strict;
91  use warnings;  use warnings;
92    
93    use base ("Data::Storage::Handler");
94  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
95    
96  use Tangram;  use Tangram;
97  use Data::Dumper;  use Data::Dumper;
98    use libp qw( getNewPerlObjectByPkgName );
99    use Data::Storage::Result::Tangram;
100    use Data::Compare::Struct qw( isEmpty );
101    use Data::Transform::Deep qw( object2hash );
102    use Data::Transform::Encode qw( var2utf8 );
103    
104    
105  # get logger instance  # get logger instance
106  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
107    
108    
109  our $metainfo = {  # this holds the complete instantiated schema from tangram
110    'disconnectMethod' => 'disconnect',  my $schema_tangram;
111  };  
112    sub getMetaInfo {
113      my $self = shift;
114      $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
115      return {
116        'disconnectMethod' => 'disconnect',
117      };
118    }
119    
120    sub _initSchema {
121      my $self = shift;
122      $logger->debug( __PACKAGE__ . "->_initSchema()" );
123      #if (!$schema_tangram) {
124        my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
125        $schema_tangram = $obj->getSchema();
126      #}
127      if (!$schema_tangram) {
128        $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
129        return 0;
130      }
131      #$self->_patchSchema();
132      return 1;
133    }
134    
135    sub _patchSchema {
136      my $self = shift;
137      foreach (keys %{$schema_tangram->{classes}}) {
138        next if $schema_tangram->{classes}->{$_}->{abstract};
139        #next if ($_ ne 'TsBankAccount');
140        #$_ ne 'AbstractAccount' &&
141        print "class: $_", "\n";
142    #print Dumper($schema_tangram->{classes}->{$_});
143        # create new string property named 'guid'
144        my $tstring = Tangram::String->new();
145        $tstring->{name} = $tstring->{col} = 'guid';
146        # inject property into schema
147        #$schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields}->{string}->{$tstring->{name}} = $tstring;
148        print Dumper($schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields});
149      }
150    }
151    
152  sub connect {  sub connect {
153    
154      my $self = shift;      my $self = shift;
155            
156      my $dsn = shift;      my $dsn = shift;
157      $dsn ||= $self->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
158            
159      $logger->debug( __PACKAGE__ . "->connect($dsn)" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
160            
161      #my $storage = Tangram::Relational->connect( $schema, $dsn );      #my $storage = Tangram::Relational->connect( $schema, $dsn );
162      #my $storage = Tangram::mysql->connect( $schema, $dsn );      #my $storage = Tangram::mysql->connect( $schema, $dsn );
# Line 45  sub connect { Line 167  sub connect {
167  #      return;  #      return;
168  #    }  #    }
169    
170        return unless $self->_initSchema();
171    
172      require 'OSA/tsobj.pm';      # create the main tangram storage object
173      tsobj::initSchema();      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
174      #sleep 1;      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
175      my $schema = tsobj::getSchema();  
176      $self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );  #print "connect", "\n";
177    #my $core = $self->{_COREHANDLE};
178    #print Dumper($core);
179        
180        # some attempts for configuring the wrapped underlying dbi.....
181      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
182      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
183      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
184        
185        # ..... encapsulation wins!
186      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
187    
188      $self->{locator}->{status}->{connected} = 1;
189    
190      return 1;
191    
192  }  }
193    
194  sub getChildNodes {  sub getChildNodes {
# Line 64  sub getChildNodes { Line 196  sub getChildNodes {
196    my $self = shift;    my $self = shift;
197    my @nodes;    my @nodes;
198    
199      $logger->debug( __PACKAGE__ . "->getChildNodes()" );
200    
201    # 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
202    #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} });
203    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
204      
205      # todo: should we retrieve information from the schema here
206      # rather than poorly getting table names from underlying dbi?
207    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
208      @nodes = @{$storage->getChildNodes()};
209    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
210    #print "getchildnodes\n";
211    #print Dumper($self);
212    #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;  
     }  
   }  
213        
214    $storage->disconnect();    # TODO: REVIEW
215      #$storage->disconnect();
216      
217      $self->{meta}->{childnodes} = \@nodes;
218        
219    return \@nodes;    return \@nodes;
220    
221  }  }
222    
223    
224    sub testIntegrity {
225    
226      my $self = shift;
227    
228      $logger->debug( __PACKAGE__ . "->testIntegrity()" );
229    
230      # 1st test: are there tables?
231      if (!$self->getChildNodes()) {
232        $logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
233        return;
234      }
235    
236      # 2nd test: is there a table named "Tangram"?
237      if (!$self->existsChildNode("Tangram")) {
238        $logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
239        return;
240      }
241    
242      $self->{locator}->{status}->{integrity} = 1;
243      return 1;
244    
245    }
246    
247    
248  sub _getSubLayerHandle {  sub _getSubLayerHandle {
249        
250    my $self = shift;    my $self = shift;
251        
252    use Data::Dumper;    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
253    
254    #print Dumper($self);    #print Dumper($self);
255      
256    # hack, make more generic!    # hack, make more generic!
257    if (!$self->{STORAGE_SUBLAYER}) {    if (!$self->{dataStorageLayer}) {
258      my $loc = new Data::Storage::Locator( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
259      $self->{STORAGE_SUBLAYER} = new Data::Storage( $loc, { protected => 1 } );      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
260        my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
261        $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
262      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
263      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
264    }    }
265        
266    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});
267        
268    return $self->{STORAGE_SUBLAYER};    return $self->{dataStorageLayer};
269        
270  }  }
271    
272  sub _configureUnderlyingStorage {  sub _configureUnderlyingStorage {
273        
274    my $self = shift;    my $self = shift;
275    
276      $logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );
277    
278    $self->_configureCOREHANDLE_DBI();    $self->_configureCOREHANDLE_DBI();
279    return;    return;
280        
281    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
282      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
283      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
284      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
285    }    }
286    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
287  }  }
# Line 124  sub configureCOREHANDLE { Line 291  sub configureCOREHANDLE {
291    
292    my $self = shift;    my $self = shift;
293    
294    $logger->debug( __PACKAGE__ . "->_configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
295    
296    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
297    
298    # apply configured modifications    # apply configured modifications
299      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
300        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
301      }      }
302      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
303        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
304      }      }
305      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
306        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
307      }      }
308      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
309        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
310      }      }
311    
312  }  }
313    
314    sub deploySchema {
315      my $self = shift;
316      my $args = shift;
317      
318      my $dsn = $self->{locator}->{dbi}->{dsn};
319    
320      $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
321    
322      my $ok;
323      if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
324        return unless $self->_initSchema();
325        $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
326        $dbh->disconnect();
327      }
328      return $ok;
329    }
330    
331    sub retreatSchema {
332    
333      my $self = shift;
334      my $dsn = $self->{locator}->{dbi}->{dsn};
335    
336      $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
337    
338      my $ok;
339      if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
340    
341        return unless $self->_initSchema();
342        
343        #use Data::Dumper; print Dumper($self);
344        $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
345        
346        $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
347    
348        # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
349        # - ... Tangram::Relational->retreat doesn't seem to return a valid status
350        # - possible improvement:
351        #   - test this by checking for count of tables in database
352        #   - problem with this: there may be some left not having been included to the schema
353        #   - maybe better: use "->getChildNodes"?
354        $ok = 2;
355    
356        $dbh->disconnect();
357    
358      }
359      return $ok;
360    }
361    
362    sub rebuildDbAndSchema {
363      my $self = shift;
364      $logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );
365      my @results;
366    
367      # sum up results (bool (0/1)) in array
368      push @results, $self->retreatSchema();
369      push @results, $self->{dataStorageLayer}->dropDb();
370      push @results, $self->{dataStorageLayer}->createDb();
371      push @results, $self->deploySchema();
372    
373      # scan array for "bad ones"
374      my $res = 1;
375      map {
376        $res = 0 if (!$_);
377      } @results;
378      
379      return $res;
380    }
381    
382    sub getListUnfiltered {
383      my $self = shift;
384      my $nodename = shift;
385      my @results;
386      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
387      # get set of objects from odbms by object name
388      my $object_set = $self->{_COREHANDLE}->remote($nodename);
389      @results = $self->{_COREHANDLE}->select($object_set);
390      return \@results;
391    }
392    
393    sub getListFiltered {
394      my $self = shift;
395    
396      # redirect to unfiltered mode
397      #return $self->getListUnfiltered(@_);
398    
399      my $nodename = shift;
400      my $filters = shift;
401      my @results;
402      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
403    
404      #print Dumper($filters);
405      
406      my @tfilters;
407      
408      foreach my $filter (@$filters) {
409      
410        # get filter - TODO: for each filter
411        #my $filter = $filters->[0];
412      
413        # build filter
414        my $lexpr = $filter->{key};
415        #my $op = $filter->{op};
416        my $op = '=';
417        my $rexpr = $filter->{val};
418        my $tight = 100;
419        
420      #  my $tfilter = Tangram::Filter->new(
421      #    expr => "t1.$lexpr $op '$rexpr'",
422      #    tight => $tight,
423      #    objects => $objects,
424      #  );
425      
426        # HACK: build eval-string (sorry) to get filtered list - please give advice here
427        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
428    
429      }
430    
431      my $tfilter = join(' & ', @tfilters);
432    
433      # get set of objects from odbms by object name
434      my $remote = $self->{_COREHANDLE}->remote($nodename);
435      
436      # was:
437      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
438    
439      # is:
440      # HACK: build eval-string (sorry) to get filtered list - please give advice here
441      my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
442      
443      # get filtered list/set
444      @results = eval($evalstring);
445      die $@ if $@;
446      
447      return \@results;
448    }
449    
450    sub createCursor {
451      my $self = shift;
452      my $node = shift;
453      my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
454      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
455      return $result;
456    }
457    
458    sub createSet {
459      my $self = shift;
460    #print "-" x 80, "\n";
461    #print Dumper(@_);
462      my @objects = @_;
463      my $rh = Set::Object->new();
464      foreach (@objects) {
465        if (!isEmpty($_)) {
466    #print Dumper($_);
467          $rh->insert($_);
468        }
469      }
470      #print Dumper($rh->members());
471      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
472      return $result;
473    }
474    
475    sub sendQuery {
476      my $self = shift;
477      my $query = shift;
478      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
479      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
480    
481      #print Dumper($query);
482    
483      # HACK: special case: querying by id does not translate into a common tangram query
484      # just load the object by given id(ent)
485      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
486        #print "LOAD!!!", "\n";
487        #exit;
488        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
489        my $ident = $query->{criterias}->[0]->{val};
490    #print "load obj", "\n";
491        #return $self->createSet() if $ident == 5;
492        $self->{_COREHANDLE}->unload($ident);
493        my $object = $self->{_COREHANDLE}->load($ident);
494    #print "get id", "\n";
495        my $oid = $self->{_COREHANDLE}->id($object);
496    #print Dumper($object);
497    #print "oid: $oid", "\n";
498        return $self->createSet($object);
499        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
500      }
501    
502      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
503    
504      # TODO: do a common tangram query here
505    
506      my @crits;
507      foreach (@{$query->{criterias}}) {
508        my $op = '';
509        $op = '=' if lc $_->{op} eq 'eq';
510        push @crits, "$_->{key}$op'$_->{val}'";
511      }
512      my $subnodes = {};
513      map { $subnodes->{$_}++ } @{$query->{subnodes}};
514      # HACK: this is hardcoded ;(    expand possibilities!
515      #my $crit = join(' AND ', @crits);
516      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
517      #return $self->sendCommand($sql);
518      #my $h = $self->{COREHANDLE}->remote($query->{node});
519      #my $res = $self->{COREHANDLE}->select($h, $h->{);
520      return $self->createCursor($query->{node});
521    }
522    
523    sub eraseAll {
524      my $self = shift;
525      my $classname = shift;
526      my $remote = $self->{_COREHANDLE}->remote($classname);
527      my @objs = $self->{_COREHANDLE}->select($remote);
528      $self->{_COREHANDLE}->erase(@objs);
529    }
530    
531    sub createDb {
532      my $self = shift;
533      my $storage = $self->_getSubLayerHandle();
534      return $storage->createDb();
535    }
536    
537    sub getObject {
538      my $self = shift;
539      my $oid = shift;
540      my $options = shift;
541    
542      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
543      # unload($oid) will only unload object, not deep object hashes
544      $self->{_COREHANDLE}->unload() if ($options->{destroy});
545    
546      # TODO: review this
547      #if (!$self->{COREHANDLE}) { return; }
548    
549      # TODO: review this
550      my $object = eval('$self->{_COREHANDLE}->load($oid);');
551      print $@, "\n" if $@;
552    
553      return $object if $object;
554    }
555    
556    sub getObjectByGuid {
557      my $self = shift;
558      my $guid = shift;
559      my $options = shift;
560      
561      # Guid and Classname is needed
562      if(!$guid || !$options->{classname}) {
563        return;
564      }
565      
566      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
567      # unload($oid) will only unload object, not deep object hashes
568      $self->{_COREHANDLE}->unload() if ($options->{destroy});
569    
570      # search for object with given Classname and Guid
571      my $obj_tmp = $self->{_COREHANDLE}->remote($classname);
572      my @result = $self->{_COREHANDLE}->select($obj_tmp, $obj_tmp->{guid} eq $guid);
573      
574      # we searched for global unique identifer of some object,
575      # so it think we can trust there would be only one result
576      if($result[0]) {
577        return $result[0];
578      } else {
579        return "No Object with Classname $classname and GUID $options->{guid} found!";
580      }
581      
582    }
583    
584    sub getObjectAsHash {
585      my $self = shift;
586      my $oid = shift;
587      my $options = shift;  
588      my $obj;
589      
590      if($options->{guid}) {
591        $obj = $self->getObjectByGuid($oid, $options);
592      } else {
593        $obj = $self->getObject($oid, $options);
594      }
595      
596      # build options (a callback to unload autovivified objects) for 'expand'
597      # TODO: use $logger to write to debug here!
598      my $cb; # = sub {};
599    =pod
600      if ($options->{destroy}) {
601        $options->{cb}->{destroy} = sub {
602          print "================ DESTROY", "\n";
603          my $object = shift;
604          #print Dumper($object);
605          $self->{_COREHANDLE}->unload($object);
606          #undef($object);
607        };
608      }
609    =cut
610    
611      my $hash = object2hash($obj, $options);
612      #$options->{cb}->{destroy}->($obj);
613      #$self->{_COREHANDLE}->unload($obj);
614      
615      # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML
616      # now done in object2hash
617      #var2utf8($hash) if ($options->{utf8});
618      
619      # old (wrong) attempts to get rid of used instances, if requested
620        #$obj->clear_refs;
621        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
622        #$obj->DESTROY;
623        #undef($obj) if($options->{destroy});
624      
625      return $hash;
626    }
627    
628    sub getSchema {
629      return $schema_tangram;
630    }
631    
632    sub getCOREHANDLE {
633      my $self = shift;
634      return $self->{_COREHANDLE};
635    }
636    
637  1;  1;
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