/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.10 by joko, Tue Dec 3 15:53:23 2002 UTC revision 1.32 by joko, Tue Apr 8 22:52:22 2003 UTC
# Line 3  Line 3 
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.32  2003/04/08 22:52:22  joko
7    #  modified 'querySchema': better behaviour regarding filtering result
8    #
9    #  Revision 1.31  2003/04/05 21:24:09  joko
10    #  modified 'sub getChildNodes': now contains code from 'querySchema'
11    #
12    #  Revision 1.30  2003/03/27 15:31:14  joko
13    #  fixes to modules regarding new namespace(s) below Data::Mungle::*
14    #
15    #  Revision 1.29  2003/02/21 01:47:18  joko
16    #  purged old code
17    #  minor cosmetics
18    #
19    #  Revision 1.28  2003/02/20 20:20:26  joko
20    #  tried to get auto-disconnect working again - failed with that
21    #
22    #  Revision 1.27  2003/01/31 06:30:59  joko
23    #  + enabled 'sendQuery'
24    #
25    #  Revision 1.26  2003/01/30 22:29:47  joko
26    #  + fixed module usage (removed dependency on 'libp.pm')
27    #
28    #  Revision 1.25  2003/01/19 02:30:05  joko
29    #  + fix: modified call to '_initSchema'
30    #
31    #  Revision 1.24  2002/12/22 14:13:01  joko
32    #  + sub dropDb
33    #
34    #  Revision 1.23  2002/12/19 16:31:53  joko
35    #  +- renamed sub to 'rebuildDb'
36    #
37    #  Revision 1.22  2002/12/18 22:28:16  jonen
38    #  + added extended logging at 'getObjectByGuid()'
39    #
40    #  Revision 1.21  2002/12/16 22:20:49  jonen
41    #  + fixed bug at 'getObjectByGuid()'
42    #
43    #  Revision 1.20  2002/12/16 20:49:17  jonen
44    #  + added sub 'getObjectByGuid()'
45    #  + added functionality to use 'getObjectByGuid' at 'getObjectAsHash()'
46    #
47    #  Revision 1.19  2002/12/16 06:46:09  joko
48    #  + attempt to introduce a generic '_patchSchema' - cancelled!
49    #
50    #  Revision 1.18  2002/12/13 21:48:07  joko
51    #  + fix to 'sub sendQuery'
52    #
53    #  Revision 1.17  2002/12/12 02:51:09  joko
54    #  + cosmetics
55    #
56    #  Revision 1.16  2002/12/11 06:54:10  joko
57    #  + fix: encapsulated object-loading inside an 'eval'
58    #
59    #  Revision 1.15  2002/12/05 13:55:21  joko
60    #  + now utilizing 'expand' instead of 'var_deref'
61    #  + played around with having fresh-objects - no progress....
62    #
63    #  Revision 1.14  2002/12/05 09:40:30  jonen
64    #  + added option->{destroy} at getObject for unloading all instance
65    #
66    #  Revision 1.13  2002/12/05 07:59:04  joko
67    #  + now using Tie::SecureHash as a base for the COREHANDLE
68    #  + former public COREHANDLE becomes private _COREHANDLE now
69    #  + sub getCOREHANDLE
70    #
71    #  Revision 1.12  2002/12/04 11:34:49  joko
72    #  - $schema_tangram doesn't have to be in class?
73    #
74    #  Revision 1.11  2002/12/04 08:54:08  jonen
75    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
76    #
77  #  Revision 1.10  2002/12/03 15:53:23  joko  #  Revision 1.10  2002/12/03 15:53:23  joko
78  #  + small bugfix regarding object hierarchy  #  + small bugfix regarding object hierarchy
79  #  #
# Line 56  package Data::Storage::Handler::Tangram; Line 127  package Data::Storage::Handler::Tangram;
127  use strict;  use strict;
128  use warnings;  use warnings;
129    
130    use base ("Data::Storage::Handler");
131  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
132    
133  use Tangram;  
134  use Data::Dumper;  use Data::Dumper;
135  use libp qw( getNewPerlObjectByPkgName );  use Tangram;
 use Data::Storage::Result::Tangram;  
 use Data::Compare::Struct qw( isEmpty );  
 use Data::Transform::Deep qw( var_deref );  
 use Data::Transform::Encode qw( var2utf8 );  
136    
137    use DesignPattern::Object;
138    use Data::Storage::Result::Tangram;
139    use Data::Mungle::Compare::Struct qw( isEmpty );
140    use Data::Mungle::Transform::Deep qw( expand );
141    
142  # get logger instance  # get logger instance
143  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
144    
145    
146    # this holds the complete instantiated schema from tangram
147    my $schema_tangram;
148    
149  sub getMetaInfo {  sub getMetaInfo {
150    my $self = shift;    my $self = shift;
151    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
# Line 82  sub getMetaInfo { Line 157  sub getMetaInfo {
157  sub _initSchema {  sub _initSchema {
158    my $self = shift;    my $self = shift;
159    $logger->debug( __PACKAGE__ . "->_initSchema()" );    $logger->debug( __PACKAGE__ . "->_initSchema()" );
160    #if (!$self->{schema_tangram}) {    #if (!$schema_tangram) {
161      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} } );
162      $self->{schema_tangram} = $obj->getSchema();      my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );
163        $schema_tangram = $obj->getSchema();
164    #}    #}
165    if (!$self->{schema_tangram}) {    if (!$schema_tangram) {
166      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
167      return 0;      return 0;
168    }    }
169      #$self->_patchSchema();
170    return 1;    return 1;
171  }  }
172    
173    sub _patchSchema {
174      my $self = shift;
175      foreach (keys %{$schema_tangram->{classes}}) {
176        next if $schema_tangram->{classes}->{$_}->{abstract};
177        #next if ($_ ne 'TsBankAccount');
178        #$_ ne 'AbstractAccount' &&
179        print "class: $_", "\n";
180    #print Dumper($schema_tangram->{classes}->{$_});
181        # create new string property named 'guid'
182        my $tstring = Tangram::String->new();
183        $tstring->{name} = $tstring->{col} = 'guid';
184        # inject property into schema
185        #$schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields}->{string}->{$tstring->{name}} = $tstring;
186        print Dumper($schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields});
187      }
188    }
189    
190  sub connect {  sub connect {
191    
192      my $self = shift;      my $self = shift;
193            
194      my $dsn = shift;      my $dsn = shift;
195    
196    #print Dumper($self);
197    #exit;
198    
199        # TODO: re-enable
200      $dsn ||= $self->{locator}->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
       
201      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
202            
203      #my $storage = Tangram::Relational->connect( $schema, $dsn );      #my $storage = Tangram::Relational->connect( $schema, $dsn );
# Line 111  sub connect { Line 209  sub connect {
209  #      return;  #      return;
210  #    }  #    }
211    
212      return unless $self->_initSchema();      #return unless $self->_initSchema();
213        $self->_initSchema();
214    
215      # create the main tangram storage object      # create the main tangram storage object
216      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
217      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
218    
219    #print "connect", "\n";
220    #my $core = $self->{_COREHANDLE};
221    #print Dumper($core);
222        
223      # some attempts for configuring the wrapped underlying dbi.....      # some attempts for configuring the wrapped underlying dbi.....
224      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
# Line 134  sub connect { Line 237  sub connect {
237  sub getChildNodes {  sub getChildNodes {
238    
239    my $self = shift;    my $self = shift;
240    my @nodes;    my $mode = shift;
241      my $filter = shift;
242      
243      $mode ||= 'core';
244      $filter ||= 'all';
245      
246      $logger->debug( __PACKAGE__ . "->getChildNodes($mode)" );
247    
248    $logger->debug( __PACKAGE__ . "->getChildNodes()" );    if ($mode eq 'core') {
249    
250    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE      my @nodes;
251    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });      
252    #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
253          #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
254    # todo: should we retrieve information from the schema here      #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
255    # rather than poorly getting table names from underlying dbi?      
256    my $storage = $self->_getSubLayerHandle();      # todo: should we retrieve information from the schema here
257    @nodes = @{$storage->getChildNodes()};      # rather than poorly getting table names from underlying dbi?
258    #$storage->_configureCOREHANDLE();      my $storage = $self->_getSubLayerHandle();
259  #print "getchildnodes\n";      @nodes = @{$storage->getChildNodes()};
260  #print Dumper($self);      #$storage->_configureCOREHANDLE();
261    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {    #print "getchildnodes\n";
262      #print Dumper($self);
263        #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
264        
265        # TODO: REVIEW
266        #$storage->disconnect();
267        
268        $self->{meta}->{childnodes} = \@nodes;
269    
270        return \@nodes;
271        
272    # TODO: REVIEW    } elsif ($mode eq 'root') {
273    #$storage->disconnect();      
274        # FIXME: this will return *all* known classes to 'Class::Tangram',
275        # which might not be what you expect since more than one instance
276        # of Tangram may be in memory and Class::Tangram seems to
277        # offer no methods to determine this or filter its result(s) according
278        # to a specific database.
279        my @object_names = Class::Tangram::known_classes();
280        my @concret_names;
281        my $o_cnt;
282        foreach (sort @object_names) {
283          push @concret_names, $_  if (!Class::Tangram::class_is_abstract($_));
284          $o_cnt++;
285        }
286    
287        if ($filter eq 'all') {
288          return \@object_names;
289        } elsif ($filter eq 'concrete') {
290          return \@concret_names;
291        }
292        
293    $self->{meta}->{childnodes} = \@nodes;    }
294        
   return \@nodes;  
295    
296  }  }
297    
   
298  sub testIntegrity {  sub testIntegrity {
299    
300    my $self = shift;    my $self = shift;
# Line 221  sub _configureUnderlyingStorage { Line 355  sub _configureUnderlyingStorage {
355    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
356      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
357      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
358      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
359    }    }
360    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
361  }  }
# Line 234  sub configureCOREHANDLE { Line 368  sub configureCOREHANDLE {
368    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
369    
370    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
371      #print Dumper($self);
372      #exit;
373    
374    # apply configured modifications    # apply configured modifications
375      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
376        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
377      }      }
378      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
379        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
380      }      }
381      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
382        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
383      }      }
384      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
385        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
386      }      }
387    
388  }  }
# Line 262  sub deploySchema { Line 398  sub deploySchema {
398    my $ok;    my $ok;
399    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
400      return unless $self->_initSchema();      return unless $self->_initSchema();
401      $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
402      $dbh->disconnect();      $dbh->disconnect();
403    }    }
404    return $ok;    return $ok;
# Line 283  sub retreatSchema { Line 419  sub retreatSchema {
419      #use Data::Dumper; print Dumper($self);      #use Data::Dumper; print Dumper($self);
420      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
421            
422      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
423    
424      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
425      # - ... Tangram::Relational->retreat doesn't seem to return a valid status      # - ... Tangram::Relational->retreat doesn't seem to return a valid status
# Line 299  sub retreatSchema { Line 435  sub retreatSchema {
435    return $ok;    return $ok;
436  }  }
437    
438  sub rebuildDbAndSchema {  sub rebuildDb {
439    my $self = shift;    my $self = shift;
440    $logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );    $logger->info( __PACKAGE__ . "->rebuildDb()" );
441    my @results;    my @results;
442    
443    # sum up results (bool (0/1)) in array    # sum up results (bool (0/1)) in array
# Line 325  sub getListUnfiltered { Line 461  sub getListUnfiltered {
461    my @results;    my @results;
462    $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
463    # get set of objects from odbms by object name    # get set of objects from odbms by object name
464    my $object_set = $self->{COREHANDLE}->remote($nodename);    my $object_set = $self->{_COREHANDLE}->remote($nodename);
465    @results = $self->{COREHANDLE}->select($object_set);    @results = $self->{_COREHANDLE}->select($object_set);
466    return \@results;    return \@results;
467  }  }
468    
# Line 341  sub getListFiltered { Line 477  sub getListFiltered {
477    my @results;    my @results;
478    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
479    
480    #print Dumper($filters);  #print Dumper($filters);
481        
482    my @tfilters;    my @tfilters;
483        
# Line 371  sub getListFiltered { Line 507  sub getListFiltered {
507    my $tfilter = join(' & ', @tfilters);    my $tfilter = join(' & ', @tfilters);
508    
509    # get set of objects from odbms by object name    # get set of objects from odbms by object name
510    my $remote = $self->{COREHANDLE}->remote($nodename);    my $remote = $self->{_COREHANDLE}->remote($nodename);
511        
512    # was:    # was:
513    #@results = $self->{COREHANDLE}->select($object_set, $tfilter);    #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
514    
515    # is:    # is:
516    # 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
517    my $evalstring = 'return $self->{COREHANDLE}->select($remote, ' . $tfilter . ');';    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
518      
519      #print "eval: $evalstring", "\n";
520        
521    # get filtered list/set    # get filtered list/set
522    @results = eval($evalstring);    @results = eval($evalstring);
# Line 390  sub getListFiltered { Line 528  sub getListFiltered {
528  sub createCursor {  sub createCursor {
529    my $self = shift;    my $self = shift;
530    my $node = shift;    my $node = shift;
531    my $cmdHandle = $self->{COREHANDLE}->cursor($node);    my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
532    my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );    my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
533    return $result;    return $result;
534  }  }
535    
536  sub createSet {  sub createSet {
537    my $self = shift;    my $self = shift;
538    #print "-" x 80, "\n";
539    #print Dumper(@_);
540    my @objects = @_;    my @objects = @_;
541    my $rh = Set::Object->new();    my $rh = Set::Object->new();
542    foreach (@objects) {    foreach (@objects) {
543      #print Dumper($_);      if (!isEmpty($_)) {
544      $rh->insert($_) if !isEmpty($_);  #print Dumper($_);
545          $rh->insert($_);
546        }
547    }    }
548    #print Dumper($rh->members());    #print Dumper($rh->members());
549    my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );    my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
# Line 418  sub sendQuery { Line 560  sub sendQuery {
560    
561    # HACK: special case: querying by id does not translate into a common tangram query    # HACK: special case: querying by id does not translate into a common tangram query
562    # just load the object by given id(ent)    # just load the object by given id(ent)
563    if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {    if ($query->{criterias} && ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq')) {
564      #print "LOAD!!!", "\n";      #print "LOAD!!!", "\n";
565      #exit;      #exit;
566      #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );      #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
567      my $ident = $query->{criterias}->[0]->{val};      my $ident = $query->{criterias}->[0]->{val};
568  #print "load obj", "\n";  #print "load obj", "\n";
569      #return $self->createSet() if $ident == 5;      #return $self->createSet() if $ident == 5;
570      my $object = $self->{COREHANDLE}->load($ident);      $self->{_COREHANDLE}->unload($ident);
571        my $object = $self->{_COREHANDLE}->load($ident);
572  #print "get id", "\n";  #print "get id", "\n";
573      my $oid = $self->{COREHANDLE}->id($object);      my $oid = $self->{_COREHANDLE}->id($object);
574    #print Dumper($object);
575    #print "oid: $oid", "\n";
576      return $self->createSet($object);      return $self->createSet($object);
577      #return $self->createSet( $self->{COREHANDLE}->load('300090018') );      #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
578    }    }
579    
580    die("This should not be reached for now - redirect to \$self->getListFiltered() here!");    my $list = $self->getListFiltered($query->{node}, $query->{criterias});
581      #return $self->createSet($object);
582      #return $self->createSet($list);
583      return $self->createSet(@$list);
584    
585      #die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
586    
587    
   # TODO: do a common tangram query here  
588    
589    
590      # try a generic tangram query here
591      # TODO: try to place an oql on top of that (search.cpan.org!)
592    my @crits;    my @crits;
593    foreach (@{$query->{criterias}}) {    foreach (@{$query->{criterias}}) {
594      my $op = '';      my $op = '';
# Line 456  sub sendQuery { Line 609  sub sendQuery {
609  sub eraseAll {  sub eraseAll {
610    my $self = shift;    my $self = shift;
611    my $classname = shift;    my $classname = shift;
612    my $remote = $self->{COREHANDLE}->remote($classname);    my $remote = $self->{_COREHANDLE}->remote($classname);
613    my @objs = $self->{COREHANDLE}->select($remote);    my @objs = $self->{_COREHANDLE}->select($remote);
614    $self->{COREHANDLE}->erase(@objs);    $self->{_COREHANDLE}->erase(@objs);
615  }  }
616    
617  sub createDb {  sub createDb {
# Line 470  sub createDb { Line 623  sub createDb {
623  sub getObject {  sub getObject {
624    my $self = shift;    my $self = shift;
625    my $oid = shift;    my $oid = shift;
626      my $options = shift;
627    
628      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
629      # unload($oid) will only unload object, not deep object hashes
630      $self->{_COREHANDLE}->unload() if ($options->{destroy});
631    
632    # TODO: review this    # TODO: review this
633    #if (!$self->{COREHANDLE}) { return; }    #if (!$self->{COREHANDLE}) { return; }
634    return $self->{COREHANDLE}->load($oid);  
635      # TODO: review this
636      my $object = eval('$self->{_COREHANDLE}->load($oid);');
637      print $@, "\n" if $@;
638    
639      return $object if $object;
640    }
641    
642    sub getObjectByGuid {
643      my $self = shift;
644      my $guid = shift;
645      my $options = shift;
646      
647      # Guid and Classname is needed
648      if(!$guid || !$options->{classname}) {
649       $logger->error( __PACKAGE__ . "->getObjectByGuid: No 'guid' OR no Classname in options hash was given but needed!" );
650        return;
651      }
652      
653      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
654      # unload($oid) will only unload object, not deep object hashes
655      $self->{_COREHANDLE}->unload() if ($options->{destroy});
656    
657      # search for object with given Classname and Guid
658      my $obj_tmp = $self->{_COREHANDLE}->remote($options->{classname});
659      my @result = $self->{_COREHANDLE}->select($obj_tmp, $obj_tmp->{guid} eq $guid);
660      
661      # we searched for global unique identifer of some object,
662      # so I think we can trust there would be only one result
663      if($result[0]) {
664        return $result[0];
665      } else {
666        $logger->error( __PACKAGE__ . "->getObjectByGuid: No Object with Classname $options->{classname} and GUID $guid found!" );
667        return;
668      }
669      
670  }  }
671    
672  sub getObjectAsHash {  sub getObjectAsHash {
673    my $self = shift;    my $self = shift;
674    my $oid = shift;    my $oid = shift;
675    my $options = shift;    my $options = shift;  
676    my $obj = $self->getObject($oid);    my $obj;
677    my $deref = var_deref($obj);    
678    var2utf8($deref) if ($options->{utf8});    if($options->{guid}) {
679    return $deref;      $obj = $self->getObjectByGuid($oid, $options);
680      } else {
681        $obj = $self->getObject($oid, $options);
682      }
683      
684      # build options (a callback to unload autovivified objects) for 'expand'
685      # TODO: use $logger to write to debug here!
686      my $cb; # = sub {};
687    
688      # deactivated way to get rid of used instances, if requested
689    =pod
690        if ($options->{destroy}) {
691          $options->{cb}->{destroy} = sub {
692            print "================ DESTROY", "\n";
693            my $object = shift;
694            #print Dumper($object);
695            $self->{_COREHANDLE}->unload($object);
696            #undef($object);
697          };
698        }
699    =cut
700    
701      my $hash = expand($obj, $options);
702    
703      # old (unsuccessful) attempts to get rid of used instances, if requested
704    
705        # V1:
706        #$options->{cb}->{destroy}->($obj);
707        #$self->{_COREHANDLE}->unload($obj);
708      
709        # V2:
710        #$obj->clear_refs;
711        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
712        #$obj->DESTROY;
713        #undef($obj) if($options->{destroy});
714      
715      return $hash;
716    }
717    
718    sub getSchema {
719      return $schema_tangram;
720    }
721    
722    sub getCOREHANDLE {
723      my $self = shift;
724      return $self->{_COREHANDLE};
725    }
726    
727    sub dropDb {
728      my $self = shift;
729      my $storage = $self->_getSubLayerHandle();
730      return $storage->dropDb();
731    }
732    
733    sub testAvailability {
734      my $self = shift;
735      my $storage = $self->_getSubLayerHandle();
736      return $storage->testAvailability();
737    }
738    
739    sub disconnect2 {
740      my $self = shift;
741      my $storage = $self->_getSubLayerHandle();
742      print "DISC!", "\n";
743    
744      my $storage_ll = $storage->{_COREHANDLE};
745      $storage_ll->disconnect();
746      
747      print Dumper($storage);
748      exit;
749      
750      #$self->{_COREHANDLE}
751      #$storage->disconnect();
752      $self->{dataStorageLayer}->disconnect();
753  }  }
754    
755  1;  1;
756    __END__
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