/[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 1.16 by joko, Wed Dec 11 06:54:10 2002 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.16  2002/12/11 06:54:10  joko
7    #  + fix: encapsulated object-loading inside an 'eval'
8    #
9    #  Revision 1.15  2002/12/05 13:55:21  joko
10    #  + now utilizing 'object2hash' instead of 'var_deref'
11    #  + played around with having fresh-objects - no progress....
12    #
13    #  Revision 1.14  2002/12/05 09:40:30  jonen
14    #  + added option->{destroy} at getObject for unloading all instance
15    #
16    #  Revision 1.13  2002/12/05 07:59:04  joko
17    #  + now using Tie::SecureHash as a base for the COREHANDLE
18    #  + former public COREHANDLE becomes private _COREHANDLE now
19    #  + sub getCOREHANDLE
20    #
21    #  Revision 1.12  2002/12/04 11:34:49  joko
22    #  - $schema_tangram doesn't have to be in class?
23    #
24    #  Revision 1.11  2002/12/04 08:54:08  jonen
25    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
26    #
27    #  Revision 1.10  2002/12/03 15:53:23  joko
28    #  + small bugfix regarding object hierarchy
29    #
30    #  Revision 1.9  2002/12/03 05:29:40  joko
31    #  + sub getObject
32    #  + sub getObjectAsHash
33    #
34    #  Revision 1.8  2002/12/01 22:25:51  joko
35    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
36    #
37    #  Revision 1.7  2002/12/01 04:46:19  joko
38    #  + sub eraseAll
39    #
40    #  Revision 1.6  2002/11/29 05:02:30  joko
41    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
42    #  + sub getMetaInfo
43    #  - sub existsChildNode (moved to Abstract.pm)
44    #  + sub getListUnfiltered
45    #  + sub getListFiltered
46    #  + sub createCursor
47    #  + sub createSet
48    #  + sub sendQuery
49    #
50    #  Revision 1.5  2002/11/17 06:35:18  joko
51    #  + locator metadata can now be reached via ->{locator}
52    #  - getChildNodes is now wrapped via COREHANDLE
53    #
54    #  Revision 1.4  2002/10/25 11:44:44  joko
55    #  + sub _initSchema
56    #  + sub existsChildNode
57    #  + sub testIntegrity
58    #  + sub rebuildDbAndSchema
59    #
60    #  Revision 1.3  2002/10/17 03:56:55  joko
61    #  + bugfix: trapped eval error
62    #
63    #  Revision 1.2  2002/10/17 00:10:05  joko
64    #  + removed dependency from tsobj.pm, schema is now independent
65    #  + sub getNewPerlObjectByPkgName
66    #  + sub deploySchema
67    #  + sub retreatSchema
68    #
69  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
70  #  + new  #  + new
71  #  #
72  #  ############################################
73  #################################  
74    
75  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
76    
77  use strict;  use strict;
78  use warnings;  use warnings;
79    
80    use base ("Data::Storage::Handler");
81  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
82    
83  use Tangram;  use Tangram;
84  use Data::Dumper;  use Data::Dumper;
85    use libp qw( getNewPerlObjectByPkgName );
86    use Data::Storage::Result::Tangram;
87    use Data::Compare::Struct qw( isEmpty );
88    use Data::Transform::Deep qw( object2hash );
89    use Data::Transform::Encode qw( var2utf8 );
90    
91    
92  # get logger instance  # get logger instance
93  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
94    
95    
96  our $metainfo = {  # this holds the complete instantiated schema from tangram
97    'disconnectMethod' => 'disconnect',  my $schema_tangram;
98  };  
99    sub getMetaInfo {
100      my $self = shift;
101      $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
102      return {
103        'disconnectMethod' => 'disconnect',
104      };
105    }
106    
107    sub _initSchema {
108      my $self = shift;
109      $logger->debug( __PACKAGE__ . "->_initSchema()" );
110      #if (!$schema_tangram) {
111        my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
112        $schema_tangram = $obj->getSchema();
113      #}
114      if (!$schema_tangram) {
115        $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
116        return 0;
117      }
118      return 1;
119    }
120    
121  sub connect {  sub connect {
122    
123      my $self = shift;      my $self = shift;
124            
125      my $dsn = shift;      my $dsn = shift;
126      $dsn ||= $self->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
127            
128      $logger->debug( __PACKAGE__ . "->connect($dsn)" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
129            
130      #my $storage = Tangram::Relational->connect( $schema, $dsn );      #my $storage = Tangram::Relational->connect( $schema, $dsn );
131      #my $storage = Tangram::mysql->connect( $schema, $dsn );      #my $storage = Tangram::mysql->connect( $schema, $dsn );
# Line 45  sub connect { Line 136  sub connect {
136  #      return;  #      return;
137  #    }  #    }
138    
139        return unless $self->_initSchema();
140    
141      require 'OSA/tsobj.pm';      # create the main tangram storage object
142      tsobj::initSchema();      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
143      #sleep 1;      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
144      my $schema = tsobj::getSchema();  
145      $self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );  #print "connect", "\n";
146    #my $core = $self->{_COREHANDLE};
147    #print Dumper($core);
148        
149        # some attempts for configuring the wrapped underlying dbi.....
150      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
151      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
152      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
153        
154        # ..... encapsulation wins!
155      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
156    
157      $self->{locator}->{status}->{connected} = 1;
158    
159      return 1;
160    
161  }  }
162    
163  sub getChildNodes {  sub getChildNodes {
# Line 64  sub getChildNodes { Line 165  sub getChildNodes {
165    my $self = shift;    my $self = shift;
166    my @nodes;    my @nodes;
167    
168      $logger->debug( __PACKAGE__ . "->getChildNodes()" );
169    
170    # 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
171    #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} });
172    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
173      
174      # todo: should we retrieve information from the schema here
175      # rather than poorly getting table names from underlying dbi?
176    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
177      @nodes = @{$storage->getChildNodes()};
178    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
179    #print "getchildnodes\n";
180    #print Dumper($self);
181    #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;  
     }  
   }  
182        
183    $storage->disconnect();    # TODO: REVIEW
184      #$storage->disconnect();
185      
186      $self->{meta}->{childnodes} = \@nodes;
187        
188    return \@nodes;    return \@nodes;
189    
190  }  }
191    
192    
193    sub testIntegrity {
194    
195      my $self = shift;
196    
197      $logger->debug( __PACKAGE__ . "->testIntegrity()" );
198    
199      # 1st test: are there tables?
200      if (!$self->getChildNodes()) {
201        $logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
202        return;
203      }
204    
205      # 2nd test: is there a table named "Tangram"?
206      if (!$self->existsChildNode("Tangram")) {
207        $logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
208        return;
209      }
210    
211      $self->{locator}->{status}->{integrity} = 1;
212      return 1;
213    
214    }
215    
216    
217  sub _getSubLayerHandle {  sub _getSubLayerHandle {
218        
219    my $self = shift;    my $self = shift;
220        
221    use Data::Dumper;    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
222    
223    #print Dumper($self);    #print Dumper($self);
224      
225    # hack, make more generic!    # hack, make more generic!
226    if (!$self->{STORAGE_SUBLAYER}) {    if (!$self->{dataStorageLayer}) {
227      my $loc = new Data::Storage::Locator( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
228      $self->{STORAGE_SUBLAYER} = new Data::Storage( $loc, { protected => 1 } );      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
229        my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
230        $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
231      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
232      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
233    }    }
234        
235    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});
236        
237    return $self->{STORAGE_SUBLAYER};    return $self->{dataStorageLayer};
238        
239  }  }
240    
241  sub _configureUnderlyingStorage {  sub _configureUnderlyingStorage {
242        
243    my $self = shift;    my $self = shift;
244    
245      $logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );
246    
247    $self->_configureCOREHANDLE_DBI();    $self->_configureCOREHANDLE_DBI();
248    return;    return;
249        
250    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
251      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
252      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
253      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
254    }    }
255    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
256  }  }
# Line 124  sub configureCOREHANDLE { Line 260  sub configureCOREHANDLE {
260    
261    my $self = shift;    my $self = shift;
262    
263    $logger->debug( __PACKAGE__ . "->_configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
264    
265    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
266    
267    # apply configured modifications    # apply configured modifications
268      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
269        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
270      }      }
271      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
272        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
273      }      }
274      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
275        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
276      }      }
277      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
278        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
279      }      }
280    
281  }  }
282    
283    sub deploySchema {
284      my $self = shift;
285      my $args = shift;
286      
287      my $dsn = $self->{locator}->{dbi}->{dsn};
288    
289      $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
290    
291      my $ok;
292      if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
293        return unless $self->_initSchema();
294        $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
295        $dbh->disconnect();
296      }
297      return $ok;
298    }
299    
300    sub retreatSchema {
301    
302      my $self = shift;
303      my $dsn = $self->{locator}->{dbi}->{dsn};
304    
305      $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
306    
307      my $ok;
308      if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
309    
310        return unless $self->_initSchema();
311        
312        #use Data::Dumper; print Dumper($self);
313        $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
314        
315        $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
316    
317        # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
318        # - ... Tangram::Relational->retreat doesn't seem to return a valid status
319        # - possible improvement:
320        #   - test this by checking for count of tables in database
321        #   - problem with this: there may be some left not having been included to the schema
322        #   - maybe better: use "->getChildNodes"?
323        $ok = 2;
324    
325        $dbh->disconnect();
326    
327      }
328      return $ok;
329    }
330    
331    sub rebuildDbAndSchema {
332      my $self = shift;
333      $logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );
334      my @results;
335    
336      # sum up results (bool (0/1)) in array
337      push @results, $self->retreatSchema();
338      push @results, $self->{dataStorageLayer}->dropDb();
339      push @results, $self->{dataStorageLayer}->createDb();
340      push @results, $self->deploySchema();
341    
342      # scan array for "bad ones"
343      my $res = 1;
344      map {
345        $res = 0 if (!$_);
346      } @results;
347      
348      return $res;
349    }
350    
351    sub getListUnfiltered {
352      my $self = shift;
353      my $nodename = shift;
354      my @results;
355      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
356      # get set of objects from odbms by object name
357      my $object_set = $self->{_COREHANDLE}->remote($nodename);
358      @results = $self->{_COREHANDLE}->select($object_set);
359      return \@results;
360    }
361    
362    sub getListFiltered {
363      my $self = shift;
364    
365      # redirect to unfiltered mode
366      #return $self->getListUnfiltered(@_);
367    
368      my $nodename = shift;
369      my $filters = shift;
370      my @results;
371      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
372    
373      #print Dumper($filters);
374      
375      my @tfilters;
376      
377      foreach my $filter (@$filters) {
378      
379        # get filter - TODO: for each filter
380        #my $filter = $filters->[0];
381      
382        # build filter
383        my $lexpr = $filter->{key};
384        #my $op = $filter->{op};
385        my $op = '=';
386        my $rexpr = $filter->{val};
387        my $tight = 100;
388        
389      #  my $tfilter = Tangram::Filter->new(
390      #    expr => "t1.$lexpr $op '$rexpr'",
391      #    tight => $tight,
392      #    objects => $objects,
393      #  );
394      
395        # HACK: build eval-string (sorry) to get filtered list - please give advice here
396        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
397    
398      }
399    
400      my $tfilter = join(' & ', @tfilters);
401    
402      # get set of objects from odbms by object name
403      my $remote = $self->{_COREHANDLE}->remote($nodename);
404      
405      # was:
406      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
407    
408      # is:
409      # HACK: build eval-string (sorry) to get filtered list - please give advice here
410      my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
411      
412      # get filtered list/set
413      @results = eval($evalstring);
414      die $@ if $@;
415      
416      return \@results;
417    }
418    
419    sub createCursor {
420      my $self = shift;
421      my $node = shift;
422      my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
423      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
424      return $result;
425    }
426    
427    sub createSet {
428      my $self = shift;
429      my @objects = @_;
430      my $rh = Set::Object->new();
431      foreach (@objects) {
432        #print Dumper($_);
433        $rh->insert($_) if !isEmpty($_);
434      }
435      #print Dumper($rh->members());
436      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
437      return $result;
438    }
439    
440    sub sendQuery {
441      my $self = shift;
442      my $query = shift;
443      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
444      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
445    
446      #print Dumper($query);
447    
448      # HACK: special case: querying by id does not translate into a common tangram query
449      # just load the object by given id(ent)
450      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
451        #print "LOAD!!!", "\n";
452        #exit;
453        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
454        my $ident = $query->{criterias}->[0]->{val};
455    #print "load obj", "\n";
456        #return $self->createSet() if $ident == 5;
457        my $object = $self->{_COREHANDLE}->load($ident);
458    #print "get id", "\n";
459        my $oid = $self->{_COREHANDLE}->id($object);
460        return $self->createSet($object);
461        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
462      }
463    
464      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
465    
466      # TODO: do a common tangram query here
467    
468      my @crits;
469      foreach (@{$query->{criterias}}) {
470        my $op = '';
471        $op = '=' if lc $_->{op} eq 'eq';
472        push @crits, "$_->{key}$op'$_->{val}'";
473      }
474      my $subnodes = {};
475      map { $subnodes->{$_}++ } @{$query->{subnodes}};
476      # HACK: this is hardcoded ;(    expand possibilities!
477      #my $crit = join(' AND ', @crits);
478      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
479      #return $self->sendCommand($sql);
480      #my $h = $self->{COREHANDLE}->remote($query->{node});
481      #my $res = $self->{COREHANDLE}->select($h, $h->{);
482      return $self->createCursor($query->{node});
483    }
484    
485    sub eraseAll {
486      my $self = shift;
487      my $classname = shift;
488      my $remote = $self->{_COREHANDLE}->remote($classname);
489      my @objs = $self->{_COREHANDLE}->select($remote);
490      $self->{_COREHANDLE}->erase(@objs);
491    }
492    
493    sub createDb {
494      my $self = shift;
495      my $storage = $self->_getSubLayerHandle();
496      return $storage->createDb();
497    }
498    
499    sub getObject {
500      my $self = shift;
501      my $oid = shift;
502      my $options = shift;
503    
504      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
505      # unload($oid) will only unload object, not deep object hashes
506      $self->{_COREHANDLE}->unload() if($options->{destroy});
507    
508      # TODO: review this
509      #if (!$self->{COREHANDLE}) { return; }
510    
511      # TODO: review this
512      my $object = eval('$self->{_COREHANDLE}->load($oid);');
513      print $@, "\n" if $@;
514    
515      return $object if $object;
516    }
517    
518    sub getObjectAsHash {
519      my $self = shift;
520      my $oid = shift;
521      my $options = shift;
522      my $obj = $self->getObject($oid, $options);
523      
524      # build options (a callback to unload autovivified objects) for 'expand'
525      # TODO: use $logger to write to debug here!
526      my $cb; # = sub {};
527    =pod
528      if ($options->{destroy}) {
529        $options->{cb}->{destroy} = sub {
530          print "================ DESTROY", "\n";
531          my $object = shift;
532          #print Dumper($object);
533          $self->{_COREHANDLE}->unload($object);
534          #undef($object);
535        };
536      }
537    =cut
538    
539      my $hash = object2hash($obj, $options);
540      #$options->{cb}->{destroy}->($obj);
541      #$self->{_COREHANDLE}->unload($obj);
542      
543      # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML
544      # now done in object2hash
545      #var2utf8($hash) if ($options->{utf8});
546      
547      # old (wrong) attempts to get rid of used instances, if requested
548        #$obj->clear_refs;
549        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
550        #$obj->DESTROY;
551        #undef($obj) if($options->{destroy});
552      
553      return $hash;
554    }
555    
556    sub getSchema {
557      return $schema_tangram;
558    }
559    
560    sub getCOREHANDLE {
561      my $self = shift;
562      return $self->{_COREHANDLE};
563    }
564    
565  1;  1;
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