/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.4 by joko, Fri Oct 25 11:44:44 2002 UTC revision 1.32 by joko, Tue Apr 8 22:52:22 2003 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
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
78    #  + small bugfix regarding object hierarchy
79    #
80    #  Revision 1.9  2002/12/03 05:29:40  joko
81    #  + sub getObject
82    #  + sub getObjectAsHash
83    #
84    #  Revision 1.8  2002/12/01 22:25:51  joko
85    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
86    #
87    #  Revision 1.7  2002/12/01 04:46:19  joko
88    #  + sub eraseAll
89    #
90    #  Revision 1.6  2002/11/29 05:02:30  joko
91    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
92    #  + sub getMetaInfo
93    #  - sub existsChildNode (moved to Abstract.pm)
94    #  + sub getListUnfiltered
95    #  + sub getListFiltered
96    #  + sub createCursor
97    #  + sub createSet
98    #  + sub sendQuery
99    #
100    #  Revision 1.5  2002/11/17 06:35:18  joko
101    #  + locator metadata can now be reached via ->{locator}
102    #  - getChildNodes is now wrapped via COREHANDLE
103    #
104  #  Revision 1.4  2002/10/25 11:44:44  joko  #  Revision 1.4  2002/10/25 11:44:44  joko
105  #  + sub _initSchema  #  + sub _initSchema
106  #  + sub existsChildNode  #  + sub existsChildNode
# Line 21  Line 119 
119  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
120  #  + new  #  + new
121  #  #
122  #  ############################################
123  #################################  
124    
125  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
126    
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 Tangram;
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  our $metainfo = {  # this holds the complete instantiated schema from tangram
147    'disconnectMethod' => 'disconnect',  my $schema_tangram;
 };  
148    
149  sub getNewPerlObjectByPkgName {  sub getMetaInfo {
150    my $pkgname = shift;    my $self = shift;
151    my $args = shift;    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
152    $logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );    return {
153    my $evstring = "use $pkgname;";      'disconnectMethod' => 'disconnect',
154    eval($evstring);    };
   $@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " .  $@ );  
   return $pkgname->new($args);  
155  }  }
156    
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->{schema}, { EXPORT_OBJECTS => $self->{classnames} } );      #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      $dsn ||= $self->{dbi}->{dsn};  
196        #print Dumper($self);
197    #exit;
198    
199        # TODO: re-enable
200        $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 84  sub connect { Line 209  sub connect {
209  #      return;  #      return;
210  #    }  #    }
211    
212      return unless $self->_initSchema();      #return unless $self->_initSchema();
213        $self->_initSchema();
214    
215        # create the main tangram storage object
216      #$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.....
224      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
225      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
226      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
227        
228        # ..... encapsulation wins!
229      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
230    
231      $self->{locator}->{status}->{connected} = 1;
232    
233    return 1;    return 1;
234    
235  }  }
# Line 101  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 $storage = $self->_getSubLayerHandle();      #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
254    #$storage->_configureCOREHANDLE();      #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
255        
256        # todo: should we retrieve information from the schema here
257        # rather than poorly getting table names from underlying dbi?
258        my $storage = $self->_getSubLayerHandle();
259        @nodes = @{$storage->getChildNodes()};
260        #$storage->_configureCOREHANDLE();
261      #print "getchildnodes\n";
262      #print Dumper($self);
263        #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
264        
265        # TODO: REVIEW
266        #$storage->disconnect();
267        
268        $self->{meta}->{childnodes} = \@nodes;
269    
270    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {      return \@nodes;
   if (my $result = $storage->sendCommand( 'SHOW TABLES;' ) ) {  
     while ( my $row = $result->_getNextEntry() ) {  
       push @nodes, $row;  
     }  
   }  
271        
272    $storage->disconnect();    } elsif ($mode eq 'root') {
273        
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    
   
 sub existsChildNode {  
   my $self = shift;  
   my $nodename = shift;  
   $logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" );  
   $self->getChildNodes() unless $self->{meta}->{childnodes};  
   return grep $nodename, @{$self->{meta}->{childnodes}};  
 }  
   
   
298  sub testIntegrity {  sub testIntegrity {
299    
300    my $self = shift;    my $self = shift;
# Line 154  sub testIntegrity { Line 313  sub testIntegrity {
313      return;      return;
314    }    }
315    
316      $self->{locator}->{status}->{integrity} = 1;
317    return 1;    return 1;
318    
319  }  }
# Line 165  sub _getSubLayerHandle { Line 325  sub _getSubLayerHandle {
325        
326    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
327    
   use Data::Dumper;  
328    #print Dumper($self);    #print Dumper($self);
329    #exit;  
     
330    # hack, make more generic!    # hack, make more generic!
331    if (!$self->{dataStorageLayer}) {    if (!$self->{dataStorageLayer}) {
332      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
333      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
334      my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi} );      my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
335      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
336      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
337      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
# Line 197  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 210  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  }  }
389    
390  sub deploySchema {  sub deploySchema {
391    my $self = shift;    my $self = shift;
392    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $args = shift;
393    my $dsn = $self->{dbi}->{dsn};    
394      my $dsn = $self->{locator}->{dbi}->{dsn};
395    
396    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
397    
398    my $ok;    my $ok;
399    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       PrintError => 0,  
                                                     } ) ) {  
   
400      return unless $self->_initSchema();      return unless $self->_initSchema();
401            $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
     $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );  
402      $dbh->disconnect();      $dbh->disconnect();
403    }    }
404    return $ok;    return $ok;
# Line 250  sub deploySchema { Line 407  sub deploySchema {
407  sub retreatSchema {  sub retreatSchema {
408    
409    my $self = shift;    my $self = shift;
410    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   my $dsn = $self->{dbi}->{dsn};  
411    
412    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
413    
414    my $ok;    my $ok;
415    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       #PrintError => 0,  
                                                       #RaiseError => 0,  
                                                     } ) ) {  
416    
417      return unless $self->_initSchema();      return unless $self->_initSchema();
418            
419      #use Data::Dumper; print Dumper($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      $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status  
424                      # idea: test this by checking for count of tables in database -      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
425                      #          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
426        # - possible improvement:
427        #   - test this by checking for count of tables in database
428        #   - problem with this: there may be some left not having been included to the schema
429        #   - maybe better: use "->getChildNodes"?
430        $ok = 2;
431    
432      $dbh->disconnect();      $dbh->disconnect();
433    
434    }    }
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 295  sub rebuildDbAndSchema { Line 455  sub rebuildDbAndSchema {
455    return $res;    return $res;
456  }  }
457    
458    sub getListUnfiltered {
459      my $self = shift;
460      my $nodename = shift;
461      my @results;
462      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
463      # get set of objects from odbms by object name
464      my $object_set = $self->{_COREHANDLE}->remote($nodename);
465      @results = $self->{_COREHANDLE}->select($object_set);
466      return \@results;
467    }
468    
469    sub getListFiltered {
470      my $self = shift;
471    
472      # redirect to unfiltered mode
473      #return $self->getListUnfiltered(@_);
474    
475      my $nodename = shift;
476      my $filters = shift;
477      my @results;
478      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
479    
480    #print Dumper($filters);
481      
482      my @tfilters;
483      
484      foreach my $filter (@$filters) {
485      
486        # get filter - TODO: for each filter
487        #my $filter = $filters->[0];
488      
489        # build filter
490        my $lexpr = $filter->{key};
491        #my $op = $filter->{op};
492        my $op = '=';
493        my $rexpr = $filter->{val};
494        my $tight = 100;
495        
496      #  my $tfilter = Tangram::Filter->new(
497      #    expr => "t1.$lexpr $op '$rexpr'",
498      #    tight => $tight,
499      #    objects => $objects,
500      #  );
501      
502        # HACK: build eval-string (sorry) to get filtered list - please give advice here
503        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
504    
505      }
506    
507      my $tfilter = join(' & ', @tfilters);
508    
509      # get set of objects from odbms by object name
510      my $remote = $self->{_COREHANDLE}->remote($nodename);
511      
512      # was:
513      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
514    
515      # is:
516      # HACK: build eval-string (sorry) to get filtered list - please give advice here
517      my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
518      
519      #print "eval: $evalstring", "\n";
520      
521      # get filtered list/set
522      @results = eval($evalstring);
523      die $@ if $@;
524      
525      return \@results;
526    }
527    
528    sub createCursor {
529      my $self = shift;
530      my $node = shift;
531      my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
532      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
533      return $result;
534    }
535    
536    sub createSet {
537      my $self = shift;
538    #print "-" x 80, "\n";
539    #print Dumper(@_);
540      my @objects = @_;
541      my $rh = Set::Object->new();
542      foreach (@objects) {
543        if (!isEmpty($_)) {
544    #print Dumper($_);
545          $rh->insert($_);
546        }
547      }
548      #print Dumper($rh->members());
549      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
550      return $result;
551    }
552    
553    sub sendQuery {
554      my $self = shift;
555      my $query = shift;
556      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
557      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
558    
559      #print Dumper($query);
560    
561      # HACK: special case: querying by id does not translate into a common tangram query
562      # just load the object by given id(ent)
563      if ($query->{criterias} && ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq')) {
564        #print "LOAD!!!", "\n";
565        #exit;
566        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
567        my $ident = $query->{criterias}->[0]->{val};
568    #print "load obj", "\n";
569        #return $self->createSet() if $ident == 5;
570        $self->{_COREHANDLE}->unload($ident);
571        my $object = $self->{_COREHANDLE}->load($ident);
572    #print "get id", "\n";
573        my $oid = $self->{_COREHANDLE}->id($object);
574    #print Dumper($object);
575    #print "oid: $oid", "\n";
576        return $self->createSet($object);
577        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
578      }
579    
580      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    
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;
593      foreach (@{$query->{criterias}}) {
594        my $op = '';
595        $op = '=' if lc $_->{op} eq 'eq';
596        push @crits, "$_->{key}$op'$_->{val}'";
597      }
598      my $subnodes = {};
599      map { $subnodes->{$_}++ } @{$query->{subnodes}};
600      # HACK: this is hardcoded ;(    expand possibilities!
601      #my $crit = join(' AND ', @crits);
602      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
603      #return $self->sendCommand($sql);
604      #my $h = $self->{COREHANDLE}->remote($query->{node});
605      #my $res = $self->{COREHANDLE}->select($h, $h->{);
606      return $self->createCursor($query->{node});
607    }
608    
609    sub eraseAll {
610      my $self = shift;
611      my $classname = shift;
612      my $remote = $self->{_COREHANDLE}->remote($classname);
613      my @objs = $self->{_COREHANDLE}->select($remote);
614      $self->{_COREHANDLE}->erase(@objs);
615    }
616    
617    sub createDb {
618      my $self = shift;
619      my $storage = $self->_getSubLayerHandle();
620      return $storage->createDb();
621    }
622    
623    sub getObject {
624      my $self = shift;
625      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
633      #if (!$self->{COREHANDLE}) { return; }
634    
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 {
673      my $self = shift;
674      my $oid = shift;
675      my $options = shift;  
676      my $obj;
677      
678      if($options->{guid}) {
679        $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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