/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.3 by joko, Thu Oct 17 03:56:55 2002 UTC revision 1.35 by jonen, Sat Apr 19 16:09:48 2003 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.35  2003/04/19 16:09:48  jonen
7    #  + added operator dispatching (currently for getting ref-type) at 'getListFiltered'
8    #
9    #  Revision 1.34  2003/04/11 01:18:53  joko
10    #  sendQuery:
11    #  + introduced crud action 'DELETE'
12    #
13    #  Revision 1.33  2003/04/09 06:07:43  joko
14    #  revamped 'sub sendQuery'
15    #
16    #  Revision 1.32  2003/04/08 22:52:22  joko
17    #  modified 'querySchema': better behaviour regarding filtering result
18    #
19    #  Revision 1.31  2003/04/05 21:24:09  joko
20    #  modified 'sub getChildNodes': now contains code from 'querySchema'
21    #
22    #  Revision 1.30  2003/03/27 15:31:14  joko
23    #  fixes to modules regarding new namespace(s) below Data::Mungle::*
24    #
25    #  Revision 1.29  2003/02/21 01:47:18  joko
26    #  purged old code
27    #  minor cosmetics
28    #
29    #  Revision 1.28  2003/02/20 20:20:26  joko
30    #  tried to get auto-disconnect working again - failed with that
31    #
32    #  Revision 1.27  2003/01/31 06:30:59  joko
33    #  + enabled 'sendQuery'
34    #
35    #  Revision 1.26  2003/01/30 22:29:47  joko
36    #  + fixed module usage (removed dependency on 'libp.pm')
37    #
38    #  Revision 1.25  2003/01/19 02:30:05  joko
39    #  + fix: modified call to '_initSchema'
40    #
41    #  Revision 1.24  2002/12/22 14:13:01  joko
42    #  + sub dropDb
43    #
44    #  Revision 1.23  2002/12/19 16:31:53  joko
45    #  +- renamed sub to 'rebuildDb'
46    #
47    #  Revision 1.22  2002/12/18 22:28:16  jonen
48    #  + added extended logging at 'getObjectByGuid()'
49    #
50    #  Revision 1.21  2002/12/16 22:20:49  jonen
51    #  + fixed bug at 'getObjectByGuid()'
52    #
53    #  Revision 1.20  2002/12/16 20:49:17  jonen
54    #  + added sub 'getObjectByGuid()'
55    #  + added functionality to use 'getObjectByGuid' at 'getObjectAsHash()'
56    #
57    #  Revision 1.19  2002/12/16 06:46:09  joko
58    #  + attempt to introduce a generic '_patchSchema' - cancelled!
59    #
60    #  Revision 1.18  2002/12/13 21:48:07  joko
61    #  + fix to 'sub sendQuery'
62    #
63    #  Revision 1.17  2002/12/12 02:51:09  joko
64    #  + cosmetics
65    #
66    #  Revision 1.16  2002/12/11 06:54:10  joko
67    #  + fix: encapsulated object-loading inside an 'eval'
68    #
69    #  Revision 1.15  2002/12/05 13:55:21  joko
70    #  + now utilizing 'expand' instead of 'var_deref'
71    #  + played around with having fresh-objects - no progress....
72    #
73    #  Revision 1.14  2002/12/05 09:40:30  jonen
74    #  + added option->{destroy} at getObject for unloading all instance
75    #
76    #  Revision 1.13  2002/12/05 07:59:04  joko
77    #  + now using Tie::SecureHash as a base for the COREHANDLE
78    #  + former public COREHANDLE becomes private _COREHANDLE now
79    #  + sub getCOREHANDLE
80    #
81    #  Revision 1.12  2002/12/04 11:34:49  joko
82    #  - $schema_tangram doesn't have to be in class?
83    #
84    #  Revision 1.11  2002/12/04 08:54:08  jonen
85    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
86    #
87    #  Revision 1.10  2002/12/03 15:53:23  joko
88    #  + small bugfix regarding object hierarchy
89    #
90    #  Revision 1.9  2002/12/03 05:29:40  joko
91    #  + sub getObject
92    #  + sub getObjectAsHash
93    #
94    #  Revision 1.8  2002/12/01 22:25:51  joko
95    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
96    #
97    #  Revision 1.7  2002/12/01 04:46:19  joko
98    #  + sub eraseAll
99    #
100    #  Revision 1.6  2002/11/29 05:02:30  joko
101    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
102    #  + sub getMetaInfo
103    #  - sub existsChildNode (moved to Abstract.pm)
104    #  + sub getListUnfiltered
105    #  + sub getListFiltered
106    #  + sub createCursor
107    #  + sub createSet
108    #  + sub sendQuery
109    #
110    #  Revision 1.5  2002/11/17 06:35:18  joko
111    #  + locator metadata can now be reached via ->{locator}
112    #  - getChildNodes is now wrapped via COREHANDLE
113    #
114    #  Revision 1.4  2002/10/25 11:44:44  joko
115    #  + sub _initSchema
116    #  + sub existsChildNode
117    #  + sub testIntegrity
118    #  + sub rebuildDbAndSchema
119    #
120  #  Revision 1.3  2002/10/17 03:56:55  joko  #  Revision 1.3  2002/10/17 03:56:55  joko
121  #  + bugfix: trapped eval error  #  + bugfix: trapped eval error
122  #  #
# Line 15  Line 129 
129  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
130  #  + new  #  + new
131  #  #
132  #  ############################################
133  #################################  
134    
135  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
136    
137  use strict;  use strict;
138  use warnings;  use warnings;
139    
140    use base ("Data::Storage::Handler");
141  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
142    
143  use Tangram;  
144  use Data::Dumper;  use Data::Dumper;
145    use Tangram;
146    
147    use DesignPattern::Object;
148    use Data::Storage::Result::Tangram;
149    use Data::Mungle::Compare::Struct qw( isEmpty );
150    use Data::Mungle::Transform::Deep qw( expand deep_copy merge_to );
151    
152  # get logger instance  # get logger instance
153  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
154    
155    
156  our $metainfo = {  # this holds the complete instantiated schema from tangram
157    'disconnectMethod' => 'disconnect',  my $schema_tangram;
 };  
158    
159  sub getNewPerlObjectByPkgName {  sub getMetaInfo {
160    my $pkgname = shift;    my $self = shift;
161    my $args = shift;    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
162    $logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );    return {
163    my $evstring = "use $pkgname;";      'disconnectMethod' => 'disconnect',
164    eval($evstring);    };
165    $@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " .  $@ );  }
166    return $pkgname->new($args);  
167    sub _initSchema {
168      my $self = shift;
169      $logger->debug( __PACKAGE__ . "->_initSchema()" );
170      #if (!$schema_tangram) {
171        #my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
172        my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );
173        $schema_tangram = $obj->getSchema();
174      #}
175      if (!$schema_tangram) {
176        $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
177        return 0;
178      }
179      #$self->_patchSchema();
180      return 1;
181    }
182    
183    sub _patchSchema {
184      my $self = shift;
185      foreach (keys %{$schema_tangram->{classes}}) {
186        next if $schema_tangram->{classes}->{$_}->{abstract};
187        #next if ($_ ne 'TsBankAccount');
188        #$_ ne 'AbstractAccount' &&
189        print "class: $_", "\n";
190    #print Dumper($schema_tangram->{classes}->{$_});
191        # create new string property named 'guid'
192        my $tstring = Tangram::String->new();
193        $tstring->{name} = $tstring->{col} = 'guid';
194        # inject property into schema
195        #$schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields}->{string}->{$tstring->{name}} = $tstring;
196        print Dumper($schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields});
197      }
198  }  }
199    
200  sub connect {  sub connect {
# Line 51  sub connect { Line 202  sub connect {
202      my $self = shift;      my $self = shift;
203            
204      my $dsn = shift;      my $dsn = shift;
205      $dsn ||= $self->{dbi}->{dsn};  
206        #print Dumper($self);
207    #exit;
208    
209        # TODO: re-enable
210        $dsn ||= $self->{locator}->{dbi}->{dsn};
211      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
212            
213      #my $storage = Tangram::Relational->connect( $schema, $dsn );      #my $storage = Tangram::Relational->connect( $schema, $dsn );
# Line 64  sub connect { Line 219  sub connect {
219  #      return;  #      return;
220  #    }  #    }
221    
222      my $obj = getNewPerlObjectByPkgName($self->{schema}, { EXPORT_OBJECTS => $self->{classnames} } );      #return unless $self->_initSchema();
223      $self->{schema_tangram} = $obj->getSchema();      $self->_initSchema();
224        
225        # create the main tangram storage object
226      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
227      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
228    
229    #print "connect", "\n";
230    #my $core = $self->{_COREHANDLE};
231    #print Dumper($core);
232        
233        # some attempts for configuring the wrapped underlying dbi.....
234      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
235      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
236      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
237        
238        # ..... encapsulation wins!
239      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
240    
241      $self->{locator}->{status}->{connected} = 1;
242    
243      return 1;
244    
245  }  }
246    
247  sub getChildNodes {  sub getChildNodes {
248    
249    my $self = shift;    my $self = shift;
250    my @nodes;    my $mode = shift;
251      my $filter = shift;
252      
253      $mode ||= 'core';
254      $filter ||= 'all';
255      
256      $logger->debug( __PACKAGE__ . "->getChildNodes($mode)" );
257    
258    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE    if ($mode eq 'core') {
259    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });  
260    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );      my @nodes;
261    my $storage = $self->_getSubLayerHandle();      
262    #$storage->_configureCOREHANDLE();      # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
263        #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
264        #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
265        
266        # todo: should we retrieve information from the schema here
267        # rather than poorly getting table names from underlying dbi?
268        my $storage = $self->_getSubLayerHandle();
269        @nodes = @{$storage->getChildNodes()};
270        #$storage->_configureCOREHANDLE();
271      #print "getchildnodes\n";
272      #print Dumper($self);
273        #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
274        
275        # TODO: REVIEW
276        #$storage->disconnect();
277        
278        $self->{meta}->{childnodes} = \@nodes;
279    
280    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {      return \@nodes;
281    if (my $result = $storage->sendCommand( 'SHOW TABLES;' ) ) {    
282      while ( my $row = $result->_getNextEntry() ) {    } elsif ($mode eq 'root') {
283        push @nodes, $row;      
284        # FIXME: this will return *all* known classes to 'Class::Tangram',
285        # which might not be what you expect since more than one instance
286        # of Tangram may be in memory and Class::Tangram seems to
287        # offer no methods to determine this or filter its result(s) according
288        # to a specific database.
289        my @object_names = Class::Tangram::known_classes();
290        my @concret_names;
291        my $o_cnt;
292        foreach (sort @object_names) {
293          push @concret_names, $_  if (!Class::Tangram::class_is_abstract($_));
294          $o_cnt++;
295        }
296    
297        if ($filter eq 'all') {
298          return \@object_names;
299        } elsif ($filter eq 'concrete') {
300          return \@concret_names;
301      }      }
   }  
302        
303    $storage->disconnect();    }
304        
305    return \@nodes;  
306    }
307    
308    sub testIntegrity {
309    
310      my $self = shift;
311    
312      $logger->debug( __PACKAGE__ . "->testIntegrity()" );
313    
314      # 1st test: are there tables?
315      if (!$self->getChildNodes()) {
316        $logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
317        return;
318      }
319    
320      # 2nd test: is there a table named "Tangram"?
321      if (!$self->existsChildNode("Tangram")) {
322        $logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
323        return;
324      }
325    
326      $self->{locator}->{status}->{integrity} = 1;
327      return 1;
328    
329  }  }
330    
# Line 106  sub _getSubLayerHandle { Line 333  sub _getSubLayerHandle {
333        
334    my $self = shift;    my $self = shift;
335        
336    use Data::Dumper;    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
337    
338    #print Dumper($self);    #print Dumper($self);
339      
340    # hack, make more generic!    # hack, make more generic!
341    if (!$self->{STORAGE_SUBLAYER}) {    if (!$self->{dataStorageLayer}) {
342      my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
343      $self->{STORAGE_SUBLAYER} = Data::Storage->new( $loc, { protected => 1 } );      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
344        my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
345        $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
346      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
347      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
348    }    }
349        
350    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});
351        
352    return $self->{STORAGE_SUBLAYER};    return $self->{dataStorageLayer};
353        
354  }  }
355    
356  sub _configureUnderlyingStorage {  sub _configureUnderlyingStorage {
357        
358    my $self = shift;    my $self = shift;
359    
360      $logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );
361    
362    $self->_configureCOREHANDLE_DBI();    $self->_configureCOREHANDLE_DBI();
363    return;    return;
364        
365    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
366      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
367      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
368      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
369    }    }
370    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
371  }  }
# Line 142  sub configureCOREHANDLE { Line 375  sub configureCOREHANDLE {
375    
376    my $self = shift;    my $self = shift;
377    
378    $logger->debug( __PACKAGE__ . "->_configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
379    
380    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
381      #print Dumper($self);
382      #exit;
383    
384    # apply configured modifications    # apply configured modifications
385      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
386        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
387      }      }
388      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
389        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
390      }      }
391      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
392        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
393      }      }
394      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
395        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
396      }      }
397    
398  }  }
399    
400  sub deploySchema {  sub deploySchema {
401    my $self = shift;    my $self = shift;
402    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $args = shift;
403    my $dsn = $self->{dbi}->{dsn};    
404      my $dsn = $self->{locator}->{dbi}->{dsn};
405    
406      $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
407    
408    my $ok;    my $ok;
409    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
410                                                        PrintError => 0,      return unless $self->_initSchema();
411                                                      } ) ) {      $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
     $ok = Tangram::Relational->deploy($self->{schema}, $dbh );  
412      $dbh->disconnect();      $dbh->disconnect();
413    }    }
414    return $ok;    return $ok;
415  }  }
416    
417  sub retreatSchema {  sub retreatSchema {
418    print "retreat\n";  
419    my $self = shift;    my $self = shift;
420    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
421    my $dsn = $self->{dbi}->{dsn};  
422      $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
423    
424    my $ok;    my $ok;
425    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
426                                                        PrintError => 0,  
427                                                      } ) ) {      return unless $self->_initSchema();
428      $ok = Tangram::Relational->retreat($self->{schema}, $dbh );      
429        #use Data::Dumper; print Dumper($self);
430        $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
431        
432        $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
433    
434        # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
435        # - ... Tangram::Relational->retreat doesn't seem to return a valid status
436        # - possible improvement:
437        #   - test this by checking for count of tables in database
438        #   - problem with this: there may be some left not having been included to the schema
439        #   - maybe better: use "->getChildNodes"?
440        $ok = 2;
441    
442      $dbh->disconnect();      $dbh->disconnect();
443    
444    }    }
445    return $ok;    return $ok;
446  }  }
447    
448    sub rebuildDb {
449      my $self = shift;
450      $logger->info( __PACKAGE__ . "->rebuildDb()" );
451      my @results;
452    
453      # sum up results (bool (0/1)) in array
454      push @results, $self->retreatSchema();
455      push @results, $self->{dataStorageLayer}->dropDb();
456      push @results, $self->{dataStorageLayer}->createDb();
457      push @results, $self->deploySchema();
458    
459      # scan array for "bad ones"
460      my $res = 1;
461      map {
462        $res = 0 if (!$_);
463      } @results;
464      
465      return $res;
466    }
467    
468    sub getListUnfiltered {
469      my $self = shift;
470      my $nodename = shift;
471      my @results;
472      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
473      # get set of objects from odbms by object name
474      my $object_set = $self->{_COREHANDLE}->remote($nodename);
475      @results = $self->{_COREHANDLE}->select($object_set);
476      return \@results;
477    }
478    
479    sub getListFiltered {
480      my $self = shift;
481    
482      # redirect to unfiltered mode
483      #return $self->getListUnfiltered(@_);
484    
485      my $nodename = shift;
486      my $filters = shift;
487      my @results;
488      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
489    
490    #print Dumper($filters);
491      
492      my @tfilters;
493      
494      foreach my $filter (@$filters) {
495      
496        # get filter - TODO: for each filter
497        #my $filter = $filters->[0];
498      
499        # build filter
500        my $lexpr = $filter->{key};
501        #my $op = $filter->{op};
502        my $op = '=';
503        my $rexpr = $filter->{val};
504        my $tight = 100;
505        
506      #  my $tfilter = Tangram::Filter->new(
507      #    expr => "t1.$lexpr $op '$rexpr'",
508      #    tight => $tight,
509      #    objects => $objects,
510      #  );
511      
512        # TODO: is_op?
513        # dispatch un-common operators if exists
514        if($filter->{op} eq "ref") {
515          push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";
516        } else {
517          # HACK: build eval-string (sorry) to get filtered list - please give advice here
518          push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
519        }
520    
521      }
522    
523      my $tfilter = join(' & ', @tfilters);
524    
525      # get set of objects from odbms by object name
526      my $remote = $self->{_COREHANDLE}->remote($nodename);
527      
528      # was:
529      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
530    
531      # is:
532      # HACK: build eval-string (sorry) to get filtered list - please give advice here
533      my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
534      
535      #print "eval: $evalstring", "\n";
536      
537      # get filtered list/set
538      @results = eval($evalstring);
539      die $@ if $@;
540      
541      return \@results;
542    }
543    
544    sub createCursor {
545      my $self = shift;
546      my $node = shift;
547      my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
548      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
549      return $result;
550    }
551    
552    sub createSet {
553      my $self = shift;
554    #print "-" x 80, "\n";
555    #print Dumper(@_);
556      my @objects = @_;
557      my $rh = Set::Object->new();
558      foreach (@objects) {
559        if (!isEmpty($_)) {
560    #print Dumper($_);
561          $rh->insert($_);
562        }
563      }
564      #print Dumper($rh->members());
565      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
566      return $result;
567    }
568    
569    sub sendQuery {
570      my $self = shift;
571      my $query = shift;
572    
573      #print Dumper($query);
574    
575      # type = ITEM|LIST|TRANSPARENT
576      my $type = '';
577      # mode = OID|SPECIAL
578      my $mode = '';
579      my $ident = '';
580      my $crud = '';
581      
582      
583      # dispatch type and mode
584      
585        # defaults - 1
586        if ($query->{options}) {
587          $crud = $query->{options}->{crud};
588          $crud ||= $query->{options}->{action};
589        }
590    
591        # defaults - 2
592        $type ||= 'TRANSPARENT';
593        $crud ||= 'RETRIEVE';
594    
595        if ($query->{options}->{OID}) {
596          $type = 'ITEM';
597          $mode = 'OID';
598          $ident = $query->{options}->{OID};
599        
600        } elsif (my $guid = $query->{options}->{GUID}) {
601          $type = 'TRANSPARENT';
602          $query->{criterias} = [ { key => 'guid', op => 'eq', val => $guid } ];    
603    
604        # if operator is different (dispatcher for 'getListFiltered')
605        } elsif (my $op = $query->{options}->{op}) {
606          $type = 'TRANSPARENT';
607          $query->{criterias} = [ { key => $query->{options}->{meta_label}, op => $op, val => $query->{options}->{meta_value} } ];    
608    
609        }
610      
611        # HACK: special case: querying by id does not translate into a common tangram query
612        # just load the object by given identifier (OID) named 'id' - this is required by Data::Transfer::Sync!
613        if ($query->{criterias} && ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq')) {
614          $type = 'ITEM';
615          $mode = 'SPECIAL.SYNC';
616          $ident = $query->{criterias}->[0]->{val};
617        }
618      
619    
620      # execute query
621      my $result;
622    
623      if ($type eq 'ITEM' && $ident) {
624    
625        if ($mode eq 'OID') {    
626          # TODO: review this case!
627          $result = $self->getObject($ident, $query->{options});
628        
629        } elsif ($mode eq 'SPECIAL.SYNC') {
630    
631          # V1 - failed
632          #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
633      
634          # hmm....
635          #return $self->createSet() if $ident == 5;
636          
637          # Unload single object before doing any further operations to
638          # expect a "fresh" object from orm when performing the next calls.
639          $self->{_COREHANDLE}->unload($ident);
640          
641          # Load object from orm.
642          my $object = $self->{_COREHANDLE}->load($ident);
643      
644          # determine object identifier (OID)
645          my $oid = $self->{_COREHANDLE}->id($object);
646          
647          # encapsulate into result/response container and return this one
648          $result = $self->createSet($object);
649          
650          # debugging
651          #$result = $self->createSet( $self->{COREHANDLE}->load('300090018') );
652    
653        }
654        
655      
656      } elsif ($type eq 'TRANSPARENT') {
657    
658        if ($crud eq 'RETRIEVE') {
659    
660          my $list = $self->getListFiltered($query->{node}, $query->{criterias});
661          #return $self->createSet($object);
662          #return $self->createSet($list);
663          return $self->createSet(@$list);
664        
665          #die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
666        
667          # try a generic tangram query here
668          # TODO: try to place an oql on top of that (search.cpan.org!)
669          my @crits;
670          foreach (@{$query->{criterias}}) {
671            my $op = '';
672            $op = '=' if lc $_->{op} eq 'eq';
673            push @crits, "$_->{key}$op'$_->{val}'";
674          }
675          my $subnodes = {};
676          map { $subnodes->{$_}++ } @{$query->{subnodes}};
677          # HACK: this is hardcoded ;(    expand possibilities!
678          #my $crit = join(' AND ', @crits);
679          #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
680          #return $self->sendCommand($sql);
681          #my $h = $self->{COREHANDLE}->remote($query->{node});
682          #my $res = $self->{COREHANDLE}->select($h, $h->{);
683          $result = $self->createCursor($query->{node});
684    
685        } elsif ($crud eq 'UPDATE') {
686    
687          # Patch current query to be a loader (e.g. change action, remove payload) ...
688          my $childquery = deep_copy($query);
689          $childquery->{options}->{crud} = 'RETRIEVE';
690          delete $childquery->{payload};
691    
692          # ... to use it to fetch a fresh object using ourselves (sendQuery).
693          my $cursor = $self->sendQuery($childquery);
694          my $status = $cursor->getStatus();
695          my $object = $cursor->getNextEntry();
696    
697          # Merge values and apply value modifiers.
698          my $options = { utf8 => 1, php => 1 };
699          merge_to($object, $query->{payload}, $options);
700    
701          # Execute update operation at orm.
702          $self->update($object);
703        
704        } elsif ($crud eq 'DELETE') {
705    
706          # Patch current query to be a loader (e.g. change action) ...
707          my $childquery = deep_copy($query);
708          $childquery->{options}->{crud} = 'RETRIEVE';
709    
710          # ... to use it to fetch a fresh object using ourselves (sendQuery).
711          my $cursor = $self->sendQuery($childquery);
712          my $status = $cursor->getStatus();
713          my $object = $cursor->getNextEntry();
714    
715          $self->erase($object);
716    
717        }
718    
719      }
720    
721      return $result;
722    
723    }
724    
725    sub eraseAll {
726      my $self = shift;
727      my $classname = shift;
728      my $remote = $self->{_COREHANDLE}->remote($classname);
729      my @objs = $self->{_COREHANDLE}->select($remote);
730      $self->{_COREHANDLE}->erase(@objs);
731    }
732    
733    sub createDb {
734      my $self = shift;
735      my $storage = $self->_getSubLayerHandle();
736      return $storage->createDb();
737    }
738    
739    sub getObject {
740      my $self = shift;
741      my $oid = shift;
742      my $options = shift;
743    
744      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
745      # unload($oid) will only unload object, not deep object hashes
746      $self->{_COREHANDLE}->unload() if ($options->{destroy});
747    
748      # TODO: review this
749      #if (!$self->{COREHANDLE}) { return; }
750    
751      # TODO: review this
752      my $object = eval('$self->{_COREHANDLE}->load($oid);');
753      print $@, "\n" if $@;
754    
755      return $object if $object;
756    }
757    
758    sub getObjectByGuid_old {
759      my $self = shift;
760      my $guid = shift;
761      my $options = shift;
762      
763      # Guid and Classname is needed
764      if(!$guid || !$options->{classname}) {
765       $logger->error( __PACKAGE__ . "->getObjectByGuid: No 'guid' OR no Classname in options hash was given but needed!" );
766        return;
767      }
768      
769      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
770      # unload($oid) will only unload object, not deep object hashes
771      $self->{_COREHANDLE}->unload() if ($options->{destroy});
772    
773      # search for object with given Classname and Guid
774      my $obj_tmp = $self->{_COREHANDLE}->remote($options->{classname});
775      my @result = $self->{_COREHANDLE}->select($obj_tmp, $obj_tmp->{guid} eq $guid);
776      
777      # we searched for global unique identifer of some object,
778      # so I think we can trust there would be only one result
779      if($result[0]) {
780        return $result[0];
781      } else {
782        $logger->error( __PACKAGE__ . "->getObjectByGuid: No Object with Classname $options->{classname} and GUID $guid found!" );
783        return;
784      }
785      
786    }
787    
788    sub getObjectAsHash_old {
789      my $self = shift;
790      my $oid = shift;
791      my $options = shift;  
792      my $obj;
793      
794      if($options->{guid}) {
795        $obj = $self->getObjectByGuid($oid, $options);
796      } else {
797        $obj = $self->getObject($oid, $options);
798      }
799      
800      # build options (a callback to unload autovivified objects) for 'expand'
801      # TODO: use $logger to write to debug here!
802      my $cb; # = sub {};
803    
804      # deactivated way to get rid of used instances, if requested
805    =pod
806        if ($options->{destroy}) {
807          $options->{cb}->{destroy} = sub {
808            print "================ DESTROY", "\n";
809            my $object = shift;
810            #print Dumper($object);
811            $self->{_COREHANDLE}->unload($object);
812            #undef($object);
813          };
814        }
815    =cut
816    
817      my $hash = expand($obj, $options);
818    
819      # old (unsuccessful) attempts to get rid of used instances, if requested
820    
821        # V1:
822        #$options->{cb}->{destroy}->($obj);
823        #$self->{_COREHANDLE}->unload($obj);
824      
825        # V2:
826        #$obj->clear_refs;
827        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
828        #$obj->DESTROY;
829        #undef($obj) if($options->{destroy});
830      
831      return $hash;
832    }
833    
834    sub getSchema {
835      return $schema_tangram;
836    }
837    
838    sub getCOREHANDLE {
839      my $self = shift;
840      return $self->{_COREHANDLE};
841    }
842    
843    sub dropDb {
844      my $self = shift;
845      my $storage = $self->_getSubLayerHandle();
846      return $storage->dropDb();
847    }
848    
849    sub testAvailability {
850      my $self = shift;
851      my $storage = $self->_getSubLayerHandle();
852      return $storage->testAvailability();
853    }
854    
855    sub disconnect2 {
856      my $self = shift;
857      my $storage = $self->_getSubLayerHandle();
858      print "DISC!", "\n";
859    
860      my $storage_ll = $storage->{_COREHANDLE};
861      $storage_ll->disconnect();
862      
863      print Dumper($storage);
864      exit;
865      
866      #$self->{_COREHANDLE}
867      #$storage->disconnect();
868      $self->{dataStorageLayer}->disconnect();
869    }
870    
871  1;  1;
872    __END__
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