/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.2 by joko, Thu Oct 17 00:10:05 2002 UTC revision 1.25 by joko, Sun Jan 19 02:30:05 2003 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.25  2003/01/19 02:30:05  joko
7    #  + fix: modified call to '_initSchema'
8    #
9    #  Revision 1.24  2002/12/22 14:13:01  joko
10    #  + sub dropDb
11    #
12    #  Revision 1.23  2002/12/19 16:31:53  joko
13    #  +- renamed sub to 'rebuildDb'
14    #
15    #  Revision 1.22  2002/12/18 22:28:16  jonen
16    #  + added extended logging at 'getObjectByGuid()'
17    #
18    #  Revision 1.21  2002/12/16 22:20:49  jonen
19    #  + fixed bug at 'getObjectByGuid()'
20    #
21    #  Revision 1.20  2002/12/16 20:49:17  jonen
22    #  + added sub 'getObjectByGuid()'
23    #  + added functionality to use 'getObjectByGuid' at 'getObjectAsHash()'
24    #
25    #  Revision 1.19  2002/12/16 06:46:09  joko
26    #  + attempt to introduce a generic '_patchSchema' - cancelled!
27    #
28    #  Revision 1.18  2002/12/13 21:48:07  joko
29    #  + fix to 'sub sendQuery'
30    #
31    #  Revision 1.17  2002/12/12 02:51:09  joko
32    #  + cosmetics
33    #
34    #  Revision 1.16  2002/12/11 06:54:10  joko
35    #  + fix: encapsulated object-loading inside an 'eval'
36    #
37    #  Revision 1.15  2002/12/05 13:55:21  joko
38    #  + now utilizing 'object2hash' instead of 'var_deref'
39    #  + played around with having fresh-objects - no progress....
40    #
41    #  Revision 1.14  2002/12/05 09:40:30  jonen
42    #  + added option->{destroy} at getObject for unloading all instance
43    #
44    #  Revision 1.13  2002/12/05 07:59:04  joko
45    #  + now using Tie::SecureHash as a base for the COREHANDLE
46    #  + former public COREHANDLE becomes private _COREHANDLE now
47    #  + sub getCOREHANDLE
48    #
49    #  Revision 1.12  2002/12/04 11:34:49  joko
50    #  - $schema_tangram doesn't have to be in class?
51    #
52    #  Revision 1.11  2002/12/04 08:54:08  jonen
53    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
54    #
55    #  Revision 1.10  2002/12/03 15:53:23  joko
56    #  + small bugfix regarding object hierarchy
57    #
58    #  Revision 1.9  2002/12/03 05:29:40  joko
59    #  + sub getObject
60    #  + sub getObjectAsHash
61    #
62    #  Revision 1.8  2002/12/01 22:25:51  joko
63    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
64    #
65    #  Revision 1.7  2002/12/01 04:46:19  joko
66    #  + sub eraseAll
67    #
68    #  Revision 1.6  2002/11/29 05:02:30  joko
69    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
70    #  + sub getMetaInfo
71    #  - sub existsChildNode (moved to Abstract.pm)
72    #  + sub getListUnfiltered
73    #  + sub getListFiltered
74    #  + sub createCursor
75    #  + sub createSet
76    #  + sub sendQuery
77    #
78    #  Revision 1.5  2002/11/17 06:35:18  joko
79    #  + locator metadata can now be reached via ->{locator}
80    #  - getChildNodes is now wrapped via COREHANDLE
81    #
82    #  Revision 1.4  2002/10/25 11:44:44  joko
83    #  + sub _initSchema
84    #  + sub existsChildNode
85    #  + sub testIntegrity
86    #  + sub rebuildDbAndSchema
87    #
88    #  Revision 1.3  2002/10/17 03:56:55  joko
89    #  + bugfix: trapped eval error
90    #
91  #  Revision 1.2  2002/10/17 00:10:05  joko  #  Revision 1.2  2002/10/17 00:10:05  joko
92  #  + removed dependency from tsobj.pm, schema is now independent  #  + removed dependency from tsobj.pm, schema is now independent
93  #  + sub getNewPerlObjectByPkgName  #  + sub getNewPerlObjectByPkgName
# Line 12  Line 97 
97  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
98  #  + new  #  + new
99  #  #
100  #  ############################################
101  #################################  
102    
103  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
104    
105  use strict;  use strict;
106  use warnings;  use warnings;
107    
108    use base ("Data::Storage::Handler");
109  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
110    
111  use Tangram;  use Tangram;
112  use Data::Dumper;  use Data::Dumper;
113    use libp qw( getNewPerlObjectByPkgName );
114    use Data::Storage::Result::Tangram;
115    use Data::Compare::Struct qw( isEmpty );
116    use Data::Transform::Deep qw( object2hash );
117    use Data::Transform::Encode qw( var2utf8 );
118    
119    
120  # get logger instance  # get logger instance
121  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
122    
123    
124  our $metainfo = {  # this holds the complete instantiated schema from tangram
125    'disconnectMethod' => 'disconnect',  my $schema_tangram;
 };  
126    
127  sub getNewPerlObjectByPkgName {  sub getMetaInfo {
128    my $pkgname = shift;    my $self = shift;
129    my $args = shift;    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
130    my $evstring = "use $pkgname;";    return {
131    eval($evstring);      'disconnectMethod' => 'disconnect',
132    return $pkgname->new($args);    };
133    }
134    
135    sub _initSchema {
136      my $self = shift;
137      $logger->debug( __PACKAGE__ . "->_initSchema()" );
138      #if (!$schema_tangram) {
139        my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
140        $schema_tangram = $obj->getSchema();
141      #}
142      if (!$schema_tangram) {
143        $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
144        return 0;
145      }
146      #$self->_patchSchema();
147      return 1;
148    }
149    
150    sub _patchSchema {
151      my $self = shift;
152      foreach (keys %{$schema_tangram->{classes}}) {
153        next if $schema_tangram->{classes}->{$_}->{abstract};
154        #next if ($_ ne 'TsBankAccount');
155        #$_ ne 'AbstractAccount' &&
156        print "class: $_", "\n";
157    #print Dumper($schema_tangram->{classes}->{$_});
158        # create new string property named 'guid'
159        my $tstring = Tangram::String->new();
160        $tstring->{name} = $tstring->{col} = 'guid';
161        # inject property into schema
162        #$schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields}->{string}->{$tstring->{name}} = $tstring;
163        print Dumper($schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields});
164      }
165  }  }
166    
167  sub connect {  sub connect {
# Line 46  sub connect { Line 169  sub connect {
169      my $self = shift;      my $self = shift;
170            
171      my $dsn = shift;      my $dsn = shift;
172      $dsn ||= $self->{dbi}->{dsn};  
173        #print Dumper($self);
174    #exit;
175    
176        # TODO: re-enable
177        $dsn ||= $self->{locator}->{dbi}->{dsn};
178      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
179            
180      #my $storage = Tangram::Relational->connect( $schema, $dsn );      #my $storage = Tangram::Relational->connect( $schema, $dsn );
# Line 59  sub connect { Line 186  sub connect {
186  #      return;  #      return;
187  #    }  #    }
188    
189      my $obj = getNewPerlObjectByPkgName($self->{schema}, { EXPORT_OBJECTS => $self->{classnames} } );      #return unless $self->_initSchema();
190      $self->{schema_tangram} = $obj->getSchema();      $self->_initSchema();
191        
192        # create the main tangram storage object
193      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
194      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
195    
196    #print "connect", "\n";
197    #my $core = $self->{_COREHANDLE};
198    #print Dumper($core);
199        
200        # some attempts for configuring the wrapped underlying dbi.....
201      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
202      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
203      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
204        
205        # ..... encapsulation wins!
206      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
207    
208      $self->{locator}->{status}->{connected} = 1;
209    
210      return 1;
211    
212  }  }
213    
214  sub getChildNodes {  sub getChildNodes {
# Line 77  sub getChildNodes { Line 216  sub getChildNodes {
216    my $self = shift;    my $self = shift;
217    my @nodes;    my @nodes;
218    
219      $logger->debug( __PACKAGE__ . "->getChildNodes()" );
220    
221    # 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
222    #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} });
223    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
224      
225      # todo: should we retrieve information from the schema here
226      # rather than poorly getting table names from underlying dbi?
227    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
228      @nodes = @{$storage->getChildNodes()};
229    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
230    #print "getchildnodes\n";
231    #print Dumper($self);
232    #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;  
     }  
   }  
233        
234    $storage->disconnect();    # TODO: REVIEW
235      #$storage->disconnect();
236      
237      $self->{meta}->{childnodes} = \@nodes;
238        
239    return \@nodes;    return \@nodes;
240    
241  }  }
242    
243    
244    sub testIntegrity {
245    
246      my $self = shift;
247    
248      $logger->debug( __PACKAGE__ . "->testIntegrity()" );
249    
250      # 1st test: are there tables?
251      if (!$self->getChildNodes()) {
252        $logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
253        return;
254      }
255    
256      # 2nd test: is there a table named "Tangram"?
257      if (!$self->existsChildNode("Tangram")) {
258        $logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
259        return;
260      }
261    
262      $self->{locator}->{status}->{integrity} = 1;
263      return 1;
264    
265    }
266    
267    
268  sub _getSubLayerHandle {  sub _getSubLayerHandle {
269        
270    my $self = shift;    my $self = shift;
271        
272    use Data::Dumper;    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
273    
274    #print Dumper($self);    #print Dumper($self);
275      
276    # hack, make more generic!    # hack, make more generic!
277    if (!$self->{STORAGE_SUBLAYER}) {    if (!$self->{dataStorageLayer}) {
278      my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
279      $self->{STORAGE_SUBLAYER} = Data::Storage->new( $loc, { protected => 1 } );      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
280        my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
281        $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
282      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
283      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
284    }    }
285        
286    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});
287        
288    return $self->{STORAGE_SUBLAYER};    return $self->{dataStorageLayer};
289        
290  }  }
291    
292  sub _configureUnderlyingStorage {  sub _configureUnderlyingStorage {
293        
294    my $self = shift;    my $self = shift;
295    
296      $logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );
297    
298    $self->_configureCOREHANDLE_DBI();    $self->_configureCOREHANDLE_DBI();
299    return;    return;
300        
301    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
302      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
303      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
304      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
305    }    }
306    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
307  }  }
# Line 137  sub configureCOREHANDLE { Line 311  sub configureCOREHANDLE {
311    
312    my $self = shift;    my $self = shift;
313    
314    $logger->debug( __PACKAGE__ . "->_configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
315    
316    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
317    
318    # apply configured modifications    # apply configured modifications
319      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
320        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
321      }      }
322      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
323        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
324      }      }
325      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
326        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
327      }      }
328      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
329        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
330      }      }
331    
332  }  }
333    
334  sub deploySchema {  sub deploySchema {
335    my $self = shift;    my $self = shift;
336    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $args = shift;
337    my $dsn = $self->{dbi}->{dsn};    
338      my $dsn = $self->{locator}->{dbi}->{dsn};
339    
340      $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
341    
342    my $ok;    my $ok;
343    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
344                                                        PrintError => 0,      return unless $self->_initSchema();
345                                                      } ) ) {      $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
     $ok = Tangram::Relational->deploy($self->{schema}, $dbh );  
346      $dbh->disconnect();      $dbh->disconnect();
347    }    }
348    return $ok;    return $ok;
349  }  }
350    
351  sub retreatSchema {  sub retreatSchema {
352    print "retreat\n";  
353    my $self = shift;    my $self = shift;
354    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
355    my $dsn = $self->{dbi}->{dsn};  
356      $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
357    
358    my $ok;    my $ok;
359    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
360                                                        PrintError => 0,  
361                                                      } ) ) {      return unless $self->_initSchema();
362      $ok = Tangram::Relational->retreat($self->{schema}, $dbh );      
363        #use Data::Dumper; print Dumper($self);
364        $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
365        
366        $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
367    
368        # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
369        # - ... Tangram::Relational->retreat doesn't seem to return a valid status
370        # - possible improvement:
371        #   - test this by checking for count of tables in database
372        #   - problem with this: there may be some left not having been included to the schema
373        #   - maybe better: use "->getChildNodes"?
374        $ok = 2;
375    
376      $dbh->disconnect();      $dbh->disconnect();
377    
378    }    }
379    return $ok;    return $ok;
380  }  }
381    
382    sub rebuildDb {
383      my $self = shift;
384      $logger->info( __PACKAGE__ . "->rebuildDb()" );
385      my @results;
386    
387      # sum up results (bool (0/1)) in array
388      push @results, $self->retreatSchema();
389      push @results, $self->{dataStorageLayer}->dropDb();
390      push @results, $self->{dataStorageLayer}->createDb();
391      push @results, $self->deploySchema();
392    
393      # scan array for "bad ones"
394      my $res = 1;
395      map {
396        $res = 0 if (!$_);
397      } @results;
398      
399      return $res;
400    }
401    
402    sub getListUnfiltered {
403      my $self = shift;
404      my $nodename = shift;
405      my @results;
406      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
407      # get set of objects from odbms by object name
408      my $object_set = $self->{_COREHANDLE}->remote($nodename);
409      @results = $self->{_COREHANDLE}->select($object_set);
410      return \@results;
411    }
412    
413    sub getListFiltered {
414      my $self = shift;
415    
416      # redirect to unfiltered mode
417      #return $self->getListUnfiltered(@_);
418    
419      my $nodename = shift;
420      my $filters = shift;
421      my @results;
422      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
423    
424      #print Dumper($filters);
425      
426      my @tfilters;
427      
428      foreach my $filter (@$filters) {
429      
430        # get filter - TODO: for each filter
431        #my $filter = $filters->[0];
432      
433        # build filter
434        my $lexpr = $filter->{key};
435        #my $op = $filter->{op};
436        my $op = '=';
437        my $rexpr = $filter->{val};
438        my $tight = 100;
439        
440      #  my $tfilter = Tangram::Filter->new(
441      #    expr => "t1.$lexpr $op '$rexpr'",
442      #    tight => $tight,
443      #    objects => $objects,
444      #  );
445      
446        # HACK: build eval-string (sorry) to get filtered list - please give advice here
447        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
448    
449      }
450    
451      my $tfilter = join(' & ', @tfilters);
452    
453      # get set of objects from odbms by object name
454      my $remote = $self->{_COREHANDLE}->remote($nodename);
455      
456      # was:
457      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
458    
459      # is:
460      # HACK: build eval-string (sorry) to get filtered list - please give advice here
461      my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
462      
463      # get filtered list/set
464      @results = eval($evalstring);
465      die $@ if $@;
466      
467      return \@results;
468    }
469    
470    sub createCursor {
471      my $self = shift;
472      my $node = shift;
473      my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
474      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
475      return $result;
476    }
477    
478    sub createSet {
479      my $self = shift;
480    #print "-" x 80, "\n";
481    #print Dumper(@_);
482      my @objects = @_;
483      my $rh = Set::Object->new();
484      foreach (@objects) {
485        if (!isEmpty($_)) {
486    #print Dumper($_);
487          $rh->insert($_);
488        }
489      }
490      #print Dumper($rh->members());
491      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
492      return $result;
493    }
494    
495    sub sendQuery {
496      my $self = shift;
497      my $query = shift;
498      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
499      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
500    
501      #print Dumper($query);
502    
503      # HACK: special case: querying by id does not translate into a common tangram query
504      # just load the object by given id(ent)
505      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
506        #print "LOAD!!!", "\n";
507        #exit;
508        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
509        my $ident = $query->{criterias}->[0]->{val};
510    #print "load obj", "\n";
511        #return $self->createSet() if $ident == 5;
512        $self->{_COREHANDLE}->unload($ident);
513        my $object = $self->{_COREHANDLE}->load($ident);
514    #print "get id", "\n";
515        my $oid = $self->{_COREHANDLE}->id($object);
516    #print Dumper($object);
517    #print "oid: $oid", "\n";
518        return $self->createSet($object);
519        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
520      }
521    
522      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
523    
524      # TODO: do a common tangram query here
525    
526      my @crits;
527      foreach (@{$query->{criterias}}) {
528        my $op = '';
529        $op = '=' if lc $_->{op} eq 'eq';
530        push @crits, "$_->{key}$op'$_->{val}'";
531      }
532      my $subnodes = {};
533      map { $subnodes->{$_}++ } @{$query->{subnodes}};
534      # HACK: this is hardcoded ;(    expand possibilities!
535      #my $crit = join(' AND ', @crits);
536      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
537      #return $self->sendCommand($sql);
538      #my $h = $self->{COREHANDLE}->remote($query->{node});
539      #my $res = $self->{COREHANDLE}->select($h, $h->{);
540      return $self->createCursor($query->{node});
541    }
542    
543    sub eraseAll {
544      my $self = shift;
545      my $classname = shift;
546      my $remote = $self->{_COREHANDLE}->remote($classname);
547      my @objs = $self->{_COREHANDLE}->select($remote);
548      $self->{_COREHANDLE}->erase(@objs);
549    }
550    
551    sub createDb {
552      my $self = shift;
553      my $storage = $self->_getSubLayerHandle();
554      return $storage->createDb();
555    }
556    
557    sub getObject {
558      my $self = shift;
559      my $oid = shift;
560      my $options = shift;
561    
562      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
563      # unload($oid) will only unload object, not deep object hashes
564      $self->{_COREHANDLE}->unload() if ($options->{destroy});
565    
566      # TODO: review this
567      #if (!$self->{COREHANDLE}) { return; }
568    
569      # TODO: review this
570      my $object = eval('$self->{_COREHANDLE}->load($oid);');
571      print $@, "\n" if $@;
572    
573      return $object if $object;
574    }
575    
576    sub getObjectByGuid {
577      my $self = shift;
578      my $guid = shift;
579      my $options = shift;
580      
581      # Guid and Classname is needed
582      if(!$guid || !$options->{classname}) {
583       $logger->error( __PACKAGE__ . "->getObjectByGuid: No 'guid' OR no Classname in options hash was given but needed!" );
584        return;
585      }
586      
587      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
588      # unload($oid) will only unload object, not deep object hashes
589      $self->{_COREHANDLE}->unload() if ($options->{destroy});
590    
591      # search for object with given Classname and Guid
592      my $obj_tmp = $self->{_COREHANDLE}->remote($options->{classname});
593      my @result = $self->{_COREHANDLE}->select($obj_tmp, $obj_tmp->{guid} eq $guid);
594      
595      # we searched for global unique identifer of some object,
596      # so I think we can trust there would be only one result
597      if($result[0]) {
598        return $result[0];
599      } else {
600        $logger->error( __PACKAGE__ . "->getObjectByGuid: No Object with Classname $options->{classname} and GUID $guid found!" );
601        return;
602      }
603      
604    }
605    
606    sub getObjectAsHash {
607      my $self = shift;
608      my $oid = shift;
609      my $options = shift;  
610      my $obj;
611      
612      if($options->{guid}) {
613        $obj = $self->getObjectByGuid($oid, $options);
614      } else {
615        $obj = $self->getObject($oid, $options);
616      }
617      
618      # build options (a callback to unload autovivified objects) for 'expand'
619      # TODO: use $logger to write to debug here!
620      my $cb; # = sub {};
621    =pod
622      if ($options->{destroy}) {
623        $options->{cb}->{destroy} = sub {
624          print "================ DESTROY", "\n";
625          my $object = shift;
626          #print Dumper($object);
627          $self->{_COREHANDLE}->unload($object);
628          #undef($object);
629        };
630      }
631    =cut
632    
633      my $hash = object2hash($obj, $options);
634      #$options->{cb}->{destroy}->($obj);
635      #$self->{_COREHANDLE}->unload($obj);
636      
637      # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML
638      # now done in object2hash
639      #var2utf8($hash) if ($options->{utf8});
640      
641      # old (wrong) attempts to get rid of used instances, if requested
642        #$obj->clear_refs;
643        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
644        #$obj->DESTROY;
645        #undef($obj) if($options->{destroy});
646      
647      return $hash;
648    }
649    
650    sub getSchema {
651      return $schema_tangram;
652    }
653    
654    sub getCOREHANDLE {
655      my $self = shift;
656      return $self->{_COREHANDLE};
657    }
658    
659    sub dropDb {
660      my $self = shift;
661      my $storage = $self->_getSubLayerHandle();
662      return $storage->dropDb();
663    }
664    
665  1;  1;
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