/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.6 by joko, Fri Nov 29 05:02:30 2002 UTC revision 1.31 by joko, Sat Apr 5 21:24:09 2003 UTC
# Line 3  Line 3 
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.31  2003/04/05 21:24:09  joko
7    #  modified 'sub getChildNodes': now contains code from 'querySchema'
8    #
9    #  Revision 1.30  2003/03/27 15:31:14  joko
10    #  fixes to modules regarding new namespace(s) below Data::Mungle::*
11    #
12    #  Revision 1.29  2003/02/21 01:47:18  joko
13    #  purged old code
14    #  minor cosmetics
15    #
16    #  Revision 1.28  2003/02/20 20:20:26  joko
17    #  tried to get auto-disconnect working again - failed with that
18    #
19    #  Revision 1.27  2003/01/31 06:30:59  joko
20    #  + enabled 'sendQuery'
21    #
22    #  Revision 1.26  2003/01/30 22:29:47  joko
23    #  + fixed module usage (removed dependency on 'libp.pm')
24    #
25    #  Revision 1.25  2003/01/19 02:30:05  joko
26    #  + fix: modified call to '_initSchema'
27    #
28    #  Revision 1.24  2002/12/22 14:13:01  joko
29    #  + sub dropDb
30    #
31    #  Revision 1.23  2002/12/19 16:31:53  joko
32    #  +- renamed sub to 'rebuildDb'
33    #
34    #  Revision 1.22  2002/12/18 22:28:16  jonen
35    #  + added extended logging at 'getObjectByGuid()'
36    #
37    #  Revision 1.21  2002/12/16 22:20:49  jonen
38    #  + fixed bug at 'getObjectByGuid()'
39    #
40    #  Revision 1.20  2002/12/16 20:49:17  jonen
41    #  + added sub 'getObjectByGuid()'
42    #  + added functionality to use 'getObjectByGuid' at 'getObjectAsHash()'
43    #
44    #  Revision 1.19  2002/12/16 06:46:09  joko
45    #  + attempt to introduce a generic '_patchSchema' - cancelled!
46    #
47    #  Revision 1.18  2002/12/13 21:48:07  joko
48    #  + fix to 'sub sendQuery'
49    #
50    #  Revision 1.17  2002/12/12 02:51:09  joko
51    #  + cosmetics
52    #
53    #  Revision 1.16  2002/12/11 06:54:10  joko
54    #  + fix: encapsulated object-loading inside an 'eval'
55    #
56    #  Revision 1.15  2002/12/05 13:55:21  joko
57    #  + now utilizing 'expand' instead of 'var_deref'
58    #  + played around with having fresh-objects - no progress....
59    #
60    #  Revision 1.14  2002/12/05 09:40:30  jonen
61    #  + added option->{destroy} at getObject for unloading all instance
62    #
63    #  Revision 1.13  2002/12/05 07:59:04  joko
64    #  + now using Tie::SecureHash as a base for the COREHANDLE
65    #  + former public COREHANDLE becomes private _COREHANDLE now
66    #  + sub getCOREHANDLE
67    #
68    #  Revision 1.12  2002/12/04 11:34:49  joko
69    #  - $schema_tangram doesn't have to be in class?
70    #
71    #  Revision 1.11  2002/12/04 08:54:08  jonen
72    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
73    #
74    #  Revision 1.10  2002/12/03 15:53:23  joko
75    #  + small bugfix regarding object hierarchy
76    #
77    #  Revision 1.9  2002/12/03 05:29:40  joko
78    #  + sub getObject
79    #  + sub getObjectAsHash
80    #
81    #  Revision 1.8  2002/12/01 22:25:51  joko
82    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
83    #
84    #  Revision 1.7  2002/12/01 04:46:19  joko
85    #  + sub eraseAll
86    #
87  #  Revision 1.6  2002/11/29 05:02:30  joko  #  Revision 1.6  2002/11/29 05:02:30  joko
88  #  - sub getNewPerlObjectByPkgName (moved to libp.pm)  #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
89  #  + sub getMetaInfo  #  + sub getMetaInfo
# Line 43  package Data::Storage::Handler::Tangram; Line 124  package Data::Storage::Handler::Tangram;
124  use strict;  use strict;
125  use warnings;  use warnings;
126    
127    use base ("Data::Storage::Handler");
128  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
129    
130  use Tangram;  
131  use Data::Dumper;  use Data::Dumper;
132  use libp qw( getNewPerlObjectByPkgName );  use Tangram;
133    
134    use DesignPattern::Object;
135  use Data::Storage::Result::Tangram;  use Data::Storage::Result::Tangram;
136  use Data::Compare::Struct qw( isEmpty );  use Data::Mungle::Compare::Struct qw( isEmpty );
137    use Data::Mungle::Transform::Deep qw( expand );
138    
139  # get logger instance  # get logger instance
140  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
141    
142    
143    # this holds the complete instantiated schema from tangram
144    my $schema_tangram;
145    
146  sub getMetaInfo {  sub getMetaInfo {
147    my $self = shift;    my $self = shift;
148    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
# Line 66  sub getMetaInfo { Line 154  sub getMetaInfo {
154  sub _initSchema {  sub _initSchema {
155    my $self = shift;    my $self = shift;
156    $logger->debug( __PACKAGE__ . "->_initSchema()" );    $logger->debug( __PACKAGE__ . "->_initSchema()" );
157    #if (!$self->{schema_tangram}) {    #if (!$schema_tangram) {
158      my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );      #my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
159      $self->{schema_tangram} = $obj->getSchema();      my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );
160        $schema_tangram = $obj->getSchema();
161    #}    #}
162    if (!$self->{schema_tangram}) {    if (!$schema_tangram) {
163      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
164      return 0;      return 0;
165    }    }
166      #$self->_patchSchema();
167    return 1;    return 1;
168  }  }
169    
170    sub _patchSchema {
171      my $self = shift;
172      foreach (keys %{$schema_tangram->{classes}}) {
173        next if $schema_tangram->{classes}->{$_}->{abstract};
174        #next if ($_ ne 'TsBankAccount');
175        #$_ ne 'AbstractAccount' &&
176        print "class: $_", "\n";
177    #print Dumper($schema_tangram->{classes}->{$_});
178        # create new string property named 'guid'
179        my $tstring = Tangram::String->new();
180        $tstring->{name} = $tstring->{col} = 'guid';
181        # inject property into schema
182        #$schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields}->{string}->{$tstring->{name}} = $tstring;
183        print Dumper($schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields});
184      }
185    }
186    
187  sub connect {  sub connect {
188    
189      my $self = shift;      my $self = shift;
190            
191      my $dsn = shift;      my $dsn = shift;
192    
193    #print Dumper($self);
194    #exit;
195    
196        # TODO: re-enable
197      $dsn ||= $self->{locator}->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
       
198      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
199            
200      #my $storage = Tangram::Relational->connect( $schema, $dsn );      #my $storage = Tangram::Relational->connect( $schema, $dsn );
# Line 95  sub connect { Line 206  sub connect {
206  #      return;  #      return;
207  #    }  #    }
208    
209      return unless $self->_initSchema();      #return unless $self->_initSchema();
210        $self->_initSchema();
211    
212      # create the main tangram storage object      # create the main tangram storage object
213      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
214      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
215    
216    #print "connect", "\n";
217    #my $core = $self->{_COREHANDLE};
218    #print Dumper($core);
219        
220      # some attempts for configuring the wrapped underlying dbi.....      # some attempts for configuring the wrapped underlying dbi.....
221      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
# Line 118  sub connect { Line 234  sub connect {
234  sub getChildNodes {  sub getChildNodes {
235    
236    my $self = shift;    my $self = shift;
237    my @nodes;    my $mode = shift;
238      $mode ||= 'core';
239      
240      $logger->debug( __PACKAGE__ . "->getChildNodes($mode)" );
241    
242    $logger->debug( __PACKAGE__ . "->getChildNodes()" );    if ($mode eq 'core') {
243    
244    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE      my @nodes;
245    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });      
246    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );      # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
247        #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
248        #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
249        
250        # todo: should we retrieve information from the schema here
251        # rather than poorly getting table names from underlying dbi?
252        my $storage = $self->_getSubLayerHandle();
253        @nodes = @{$storage->getChildNodes()};
254        #$storage->_configureCOREHANDLE();
255      #print "getchildnodes\n";
256      #print Dumper($self);
257        #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
258        
259        # TODO: REVIEW
260        #$storage->disconnect();
261        
262        $self->{meta}->{childnodes} = \@nodes;
263    
264        return \@nodes;
265        
266    # todo: should we retrieve information from the schema here    } elsif ($mode eq 'root') {
267    # rather than poorly getting table names from underlying dbi?      
268    my $storage = $self->_getSubLayerHandle();      # FIXME: this will return *all* known classes to 'Class::Tangram',
269    @nodes = @{$storage->getChildNodes()};      # which might not be what you expect since more than one instance
270    #$storage->_configureCOREHANDLE();      # of Tangram may be in memory and Class::Tangram seems to
271  #print "getchildnodes\n";      # offer no methods to determine this or filter its result(s) according
272  #print Dumper($self);      # to a specific database.
273    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {      my @object_names = Class::Tangram::known_classes();
274        my @concret_names;
275        my $o_cnt;
276        foreach (sort @object_names) {
277          push @concret_names, $_  if (!Class::Tangram::class_is_abstract($_));
278          $o_cnt++;
279        }
280        
281    $storage->disconnect();      my $result = {
282          all => \@object_names,
283          concrete => \@concret_names,
284        };
285        return $result;
286        
287    $self->{meta}->{childnodes} = \@nodes;    }
288        
   return \@nodes;  
289    
290  }  }
291    
   
292  sub testIntegrity {  sub testIntegrity {
293    
294    my $self = shift;    my $self = shift;
# Line 204  sub _configureUnderlyingStorage { Line 349  sub _configureUnderlyingStorage {
349    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
350      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
351      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
352      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
353    }    }
354    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
355  }  }
# Line 217  sub configureCOREHANDLE { Line 362  sub configureCOREHANDLE {
362    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
363    
364    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
365      #print Dumper($self);
366      #exit;
367    
368    # apply configured modifications    # apply configured modifications
369      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
370        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
371      }      }
372      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
373        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
374      }      }
375      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
376        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
377      }      }
378      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
379        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
380      }      }
381    
382  }  }
# Line 239  sub deploySchema { Line 386  sub deploySchema {
386    my $args = shift;    my $args = shift;
387        
388    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   #my $dsn = $self->{dbi}->{dsn};  
389    
390    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
391    
392    my $ok;    my $ok;
393    # TODO: is this DBI->connect okay here like it is? regarding errors.....???    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
   if ( my $dbh = DBI->connect($dsn, '', '', {  
                                                       PrintError => 0,  
                                                     } ) ) {  
   
394      return unless $self->_initSchema();      return unless $self->_initSchema();
395            $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
     $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );  
396      $dbh->disconnect();      $dbh->disconnect();
397    }    }
398    return $ok;    return $ok;
# Line 261  sub retreatSchema { Line 402  sub retreatSchema {
402    
403    my $self = shift;    my $self = shift;
404    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   #my $dsn = $self->{dbi}->{dsn};  
405    
406    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
407    
408    my $ok;    my $ok;
409    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       #PrintError => 0,  
                                                       #RaiseError => 0,  
                                                     } ) ) {  
410    
411      return unless $self->_initSchema();      return unless $self->_initSchema();
412            
413      #use Data::Dumper; print Dumper($self);      #use Data::Dumper; print Dumper($self);
414      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
415            
416      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
417      $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status  
418                      # idea: test this by checking for count of tables in database -      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
419                      #          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
420        # - possible improvement:
421        #   - test this by checking for count of tables in database
422        #   - problem with this: there may be some left not having been included to the schema
423        #   - maybe better: use "->getChildNodes"?
424        $ok = 2;
425    
426      $dbh->disconnect();      $dbh->disconnect();
427    
428    }    }
429    return $ok;    return $ok;
430  }  }
431    
432  sub rebuildDbAndSchema {  sub rebuildDb {
433    my $self = shift;    my $self = shift;
434    $logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );    $logger->info( __PACKAGE__ . "->rebuildDb()" );
435    my @results;    my @results;
436    
437    # sum up results (bool (0/1)) in array    # sum up results (bool (0/1)) in array
# Line 311  sub getListUnfiltered { Line 455  sub getListUnfiltered {
455    my @results;    my @results;
456    $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
457    # get set of objects from odbms by object name    # get set of objects from odbms by object name
458    my $object_set = $self->{COREHANDLE}->remote($nodename);    my $object_set = $self->{_COREHANDLE}->remote($nodename);
459    @results = $self->{COREHANDLE}->select($object_set);    @results = $self->{_COREHANDLE}->select($object_set);
460    return \@results;    return \@results;
461  }  }
462    
# Line 327  sub getListFiltered { Line 471  sub getListFiltered {
471    my @results;    my @results;
472    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
473    
474    #print Dumper($filters);  #print Dumper($filters);
475        
476    my @tfilters;    my @tfilters;
477        
# Line 357  sub getListFiltered { Line 501  sub getListFiltered {
501    my $tfilter = join(' & ', @tfilters);    my $tfilter = join(' & ', @tfilters);
502    
503    # get set of objects from odbms by object name    # get set of objects from odbms by object name
504    my $remote = $self->{COREHANDLE}->remote($nodename);    my $remote = $self->{_COREHANDLE}->remote($nodename);
505        
506    # was:    # was:
507    #@results = $self->{COREHANDLE}->select($object_set, $tfilter);    #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
508    
509    # is:    # is:
510    # HACK: build eval-string (sorry) to get filtered list - please give advice here    # HACK: build eval-string (sorry) to get filtered list - please give advice here
511    my $evalstring = 'return $self->{COREHANDLE}->select($remote, ' . $tfilter . ');';    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
512      
513      #print "eval: $evalstring", "\n";
514        
515    # get filtered list/set    # get filtered list/set
516    @results = eval($evalstring);    @results = eval($evalstring);
# Line 376  sub getListFiltered { Line 522  sub getListFiltered {
522  sub createCursor {  sub createCursor {
523    my $self = shift;    my $self = shift;
524    my $node = shift;    my $node = shift;
525    my $cmdHandle = $self->{COREHANDLE}->cursor($node);    my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
526    my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );    my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
527    return $result;    return $result;
528  }  }
529    
530  sub createSet {  sub createSet {
531    my $self = shift;    my $self = shift;
532    #print "-" x 80, "\n";
533    #print Dumper(@_);
534    my @objects = @_;    my @objects = @_;
535    my $rh = Set::Object->new();    my $rh = Set::Object->new();
536    foreach (@objects) {    foreach (@objects) {
537      #print Dumper($_);      if (!isEmpty($_)) {
538      $rh->insert($_) if !isEmpty($_);  #print Dumper($_);
539          $rh->insert($_);
540        }
541    }    }
542    #print Dumper($rh->members());    #print Dumper($rh->members());
543    my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );    my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
# Line 411  sub sendQuery { Line 561  sub sendQuery {
561      my $ident = $query->{criterias}->[0]->{val};      my $ident = $query->{criterias}->[0]->{val};
562  #print "load obj", "\n";  #print "load obj", "\n";
563      #return $self->createSet() if $ident == 5;      #return $self->createSet() if $ident == 5;
564      my $object = $self->{COREHANDLE}->load($ident);      $self->{_COREHANDLE}->unload($ident);
565        my $object = $self->{_COREHANDLE}->load($ident);
566  #print "get id", "\n";  #print "get id", "\n";
567      my $oid = $self->{COREHANDLE}->id($object);      my $oid = $self->{_COREHANDLE}->id($object);
568    #print Dumper($object);
569    #print "oid: $oid", "\n";
570      return $self->createSet($object);      return $self->createSet($object);
571      #return $self->createSet( $self->{COREHANDLE}->load('300090018') );      #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
572    }    }
573    
574    die("This should not be reached for now - redirect to \$self->getListFiltered() here!");    my $list = $self->getListFiltered($query->{node}, $query->{criterias});
575      #return $self->createSet($object);
576      #return $self->createSet($list);
577      return $self->createSet(@$list);
578    
579      #die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
580    
581    
   # TODO: do a common tangram query here  
582    
583    
584      # try a generic tangram query here
585      # TODO: try to place an oql on top of that (search.cpan.org!)
586    my @crits;    my @crits;
587    foreach (@{$query->{criterias}}) {    foreach (@{$query->{criterias}}) {
588      my $op = '';      my $op = '';
# Line 439  sub sendQuery { Line 600  sub sendQuery {
600    return $self->createCursor($query->{node});    return $self->createCursor($query->{node});
601  }  }
602    
603    sub eraseAll {
604      my $self = shift;
605      my $classname = shift;
606      my $remote = $self->{_COREHANDLE}->remote($classname);
607      my @objs = $self->{_COREHANDLE}->select($remote);
608      $self->{_COREHANDLE}->erase(@objs);
609    }
610    
611    sub createDb {
612      my $self = shift;
613      my $storage = $self->_getSubLayerHandle();
614      return $storage->createDb();
615    }
616    
617    sub getObject {
618      my $self = shift;
619      my $oid = shift;
620      my $options = shift;
621    
622      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
623      # unload($oid) will only unload object, not deep object hashes
624      $self->{_COREHANDLE}->unload() if ($options->{destroy});
625    
626      # TODO: review this
627      #if (!$self->{COREHANDLE}) { return; }
628    
629      # TODO: review this
630      my $object = eval('$self->{_COREHANDLE}->load($oid);');
631      print $@, "\n" if $@;
632    
633      return $object if $object;
634    }
635    
636    sub getObjectByGuid {
637      my $self = shift;
638      my $guid = shift;
639      my $options = shift;
640      
641      # Guid and Classname is needed
642      if(!$guid || !$options->{classname}) {
643       $logger->error( __PACKAGE__ . "->getObjectByGuid: No 'guid' OR no Classname in options hash was given but needed!" );
644        return;
645      }
646      
647      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
648      # unload($oid) will only unload object, not deep object hashes
649      $self->{_COREHANDLE}->unload() if ($options->{destroy});
650    
651      # search for object with given Classname and Guid
652      my $obj_tmp = $self->{_COREHANDLE}->remote($options->{classname});
653      my @result = $self->{_COREHANDLE}->select($obj_tmp, $obj_tmp->{guid} eq $guid);
654      
655      # we searched for global unique identifer of some object,
656      # so I think we can trust there would be only one result
657      if($result[0]) {
658        return $result[0];
659      } else {
660        $logger->error( __PACKAGE__ . "->getObjectByGuid: No Object with Classname $options->{classname} and GUID $guid found!" );
661        return;
662      }
663      
664    }
665    
666    sub getObjectAsHash {
667      my $self = shift;
668      my $oid = shift;
669      my $options = shift;  
670      my $obj;
671      
672      if($options->{guid}) {
673        $obj = $self->getObjectByGuid($oid, $options);
674      } else {
675        $obj = $self->getObject($oid, $options);
676      }
677      
678      # build options (a callback to unload autovivified objects) for 'expand'
679      # TODO: use $logger to write to debug here!
680      my $cb; # = sub {};
681    
682      # deactivated way to get rid of used instances, if requested
683    =pod
684        if ($options->{destroy}) {
685          $options->{cb}->{destroy} = sub {
686            print "================ DESTROY", "\n";
687            my $object = shift;
688            #print Dumper($object);
689            $self->{_COREHANDLE}->unload($object);
690            #undef($object);
691          };
692        }
693    =cut
694    
695      my $hash = expand($obj, $options);
696    
697      # old (unsuccessful) attempts to get rid of used instances, if requested
698    
699        # V1:
700        #$options->{cb}->{destroy}->($obj);
701        #$self->{_COREHANDLE}->unload($obj);
702      
703        # V2:
704        #$obj->clear_refs;
705        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
706        #$obj->DESTROY;
707        #undef($obj) if($options->{destroy});
708      
709      return $hash;
710    }
711    
712    sub getSchema {
713      return $schema_tangram;
714    }
715    
716    sub getCOREHANDLE {
717      my $self = shift;
718      return $self->{_COREHANDLE};
719    }
720    
721    sub dropDb {
722      my $self = shift;
723      my $storage = $self->_getSubLayerHandle();
724      return $storage->dropDb();
725    }
726    
727    sub testAvailability {
728      my $self = shift;
729      my $storage = $self->_getSubLayerHandle();
730      return $storage->testAvailability();
731    }
732    
733    sub disconnect2 {
734      my $self = shift;
735      my $storage = $self->_getSubLayerHandle();
736      print "DISC!", "\n";
737    
738      my $storage_ll = $storage->{_COREHANDLE};
739      $storage_ll->disconnect();
740      
741      print Dumper($storage);
742      exit;
743      
744      #$self->{_COREHANDLE}
745      #$storage->disconnect();
746      $self->{dataStorageLayer}->disconnect();
747    }
748    
749  1;  1;
750    __END__
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