/[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 1.6 by joko, Fri Nov 29 05:02:30 2002 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.6  2002/11/29 05:02:30  joko
7    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
8    #  + sub getMetaInfo
9    #  - sub existsChildNode (moved to Abstract.pm)
10    #  + sub getListUnfiltered
11    #  + sub getListFiltered
12    #  + sub createCursor
13    #  + sub createSet
14    #  + sub sendQuery
15    #
16    #  Revision 1.5  2002/11/17 06:35:18  joko
17    #  + locator metadata can now be reached via ->{locator}
18    #  - getChildNodes is now wrapped via COREHANDLE
19    #
20    #  Revision 1.4  2002/10/25 11:44:44  joko
21    #  + sub _initSchema
22    #  + sub existsChildNode
23    #  + sub testIntegrity
24    #  + sub rebuildDbAndSchema
25    #
26  #  Revision 1.3  2002/10/17 03:56:55  joko  #  Revision 1.3  2002/10/17 03:56:55  joko
27  #  + bugfix: trapped eval error  #  + bugfix: trapped eval error
28  #  #
# Line 15  Line 35 
35  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
36  #  + new  #  + new
37  #  #
38  #  ############################################
39  #################################  
40    
41  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
42    
# Line 27  use base ("Data::Storage::Handler::Abstr Line 47  use base ("Data::Storage::Handler::Abstr
47    
48  use Tangram;  use Tangram;
49  use Data::Dumper;  use Data::Dumper;
50    use libp qw( getNewPerlObjectByPkgName );
51    use Data::Storage::Result::Tangram;
52    use Data::Compare::Struct qw( isEmpty );
53    
54  # get logger instance  # get logger instance
55  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
56    
57    
58  our $metainfo = {  sub getMetaInfo {
59    'disconnectMethod' => 'disconnect',    my $self = shift;
60  };    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
61      return {
62        'disconnectMethod' => 'disconnect',
63      };
64    }
65    
66  sub getNewPerlObjectByPkgName {  sub _initSchema {
67    my $pkgname = shift;    my $self = shift;
68    my $args = shift;    $logger->debug( __PACKAGE__ . "->_initSchema()" );
69    $logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );    #if (!$self->{schema_tangram}) {
70    my $evstring = "use $pkgname;";      my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
71    eval($evstring);      $self->{schema_tangram} = $obj->getSchema();
72    $@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " .  $@ );    #}
73    return $pkgname->new($args);    if (!$self->{schema_tangram}) {
74        $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
75        return 0;
76      }
77      return 1;
78  }  }
79    
80  sub connect {  sub connect {
# Line 51  sub connect { Line 82  sub connect {
82      my $self = shift;      my $self = shift;
83            
84      my $dsn = shift;      my $dsn = shift;
85      $dsn ||= $self->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
86            
87      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
88            
# Line 64  sub connect { Line 95  sub connect {
95  #      return;  #      return;
96  #    }  #    }
97    
98      my $obj = getNewPerlObjectByPkgName($self->{schema}, { EXPORT_OBJECTS => $self->{classnames} } );      return unless $self->_initSchema();
99      $self->{schema_tangram} = $obj->getSchema();  
100            # create the main tangram storage object
101      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
102      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );
103        
104        # some attempts for configuring the wrapped underlying dbi.....
105      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
106      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
107      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
108        
109        # ..... encapsulation wins!
110      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
111    
112      $self->{locator}->{status}->{connected} = 1;
113    
114      return 1;
115    
116  }  }
117    
118  sub getChildNodes {  sub getChildNodes {
# Line 82  sub getChildNodes { Line 120  sub getChildNodes {
120    my $self = shift;    my $self = shift;
121    my @nodes;    my @nodes;
122    
123      $logger->debug( __PACKAGE__ . "->getChildNodes()" );
124    
125    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
126    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
127    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
128      
129      # todo: should we retrieve information from the schema here
130      # rather than poorly getting table names from underlying dbi?
131    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
132      @nodes = @{$storage->getChildNodes()};
133    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
134    #print "getchildnodes\n";
135    #print Dumper($self);
136    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
   if (my $result = $storage->sendCommand( 'SHOW TABLES;' ) ) {  
     while ( my $row = $result->_getNextEntry() ) {  
       push @nodes, $row;  
     }  
   }  
137        
138    $storage->disconnect();    $storage->disconnect();
139        
140      $self->{meta}->{childnodes} = \@nodes;
141      
142    return \@nodes;    return \@nodes;
143    
144  }  }
145    
146    
147    sub testIntegrity {
148    
149      my $self = shift;
150    
151      $logger->debug( __PACKAGE__ . "->testIntegrity()" );
152    
153      # 1st test: are there tables?
154      if (!$self->getChildNodes()) {
155        $logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
156        return;
157      }
158    
159      # 2nd test: is there a table named "Tangram"?
160      if (!$self->existsChildNode("Tangram")) {
161        $logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
162        return;
163      }
164    
165      $self->{locator}->{status}->{integrity} = 1;
166      return 1;
167    
168    }
169    
170    
171  sub _getSubLayerHandle {  sub _getSubLayerHandle {
172        
173    my $self = shift;    my $self = shift;
174        
175    use Data::Dumper;    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
176    
177    #print Dumper($self);    #print Dumper($self);
178      
179    # hack, make more generic!    # hack, make more generic!
180    if (!$self->{STORAGE_SUBLAYER}) {    if (!$self->{dataStorageLayer}) {
181      my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
182      $self->{STORAGE_SUBLAYER} = Data::Storage->new( $loc, { protected => 1 } );      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
183        my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
184        $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
185      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
186      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
187    }    }
188        
189    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});    #print Dumper($self->{STORAGE_UNDER_THE_HOOD});
190        
191    return $self->{STORAGE_SUBLAYER};    return $self->{dataStorageLayer};
192        
193  }  }
194    
195  sub _configureUnderlyingStorage {  sub _configureUnderlyingStorage {
196        
197    my $self = shift;    my $self = shift;
198    
199      $logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );
200    
201    $self->_configureCOREHANDLE_DBI();    $self->_configureCOREHANDLE_DBI();
202    return;    return;
203        
# Line 142  sub configureCOREHANDLE { Line 214  sub configureCOREHANDLE {
214    
215    my $self = shift;    my $self = shift;
216    
217    $logger->debug( __PACKAGE__ . "->_configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
218    
219    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
220    
# Line 164  sub configureCOREHANDLE { Line 236  sub configureCOREHANDLE {
236    
237  sub deploySchema {  sub deploySchema {
238    my $self = shift;    my $self = shift;
239    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $args = shift;
240    my $dsn = $self->{dbi}->{dsn};    
241      my $dsn = $self->{locator}->{dbi}->{dsn};
242      #my $dsn = $self->{dbi}->{dsn};
243    
244      $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
245    
246    my $ok;    my $ok;
247      # TODO: is this DBI->connect okay here like it is? regarding errors.....???
248    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', {
249                                                        PrintError => 0,                                                        PrintError => 0,
250                                                      } ) ) {                                                      } ) ) {
251      $ok = Tangram::Relational->deploy($self->{schema}, $dbh );  
252        return unless $self->_initSchema();
253        
254        $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );
255      $dbh->disconnect();      $dbh->disconnect();
256    }    }
257    return $ok;    return $ok;
258  }  }
259    
260  sub retreatSchema {  sub retreatSchema {
261    print "retreat\n";  
262    my $self = shift;    my $self = shift;
263    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
264    my $dsn = $self->{dbi}->{dsn};    #my $dsn = $self->{dbi}->{dsn};
265    
266      $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
267    
268    my $ok;    my $ok;
269    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', {
270                                                        PrintError => 0,                                                        #PrintError => 0,
271                                                          #RaiseError => 0,
272                                                      } ) ) {                                                      } ) ) {
273      $ok = Tangram::Relational->retreat($self->{schema}, $dbh );  
274        return unless $self->_initSchema();
275        
276        #use Data::Dumper; print Dumper($self);
277        $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
278        
279        $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );
280        $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status
281                        # idea: test this by checking for count of tables in database -
282                        #          problem with this: there may be some left not having been included to the schema
283      $dbh->disconnect();      $dbh->disconnect();
284    }    }
285    return $ok;    return $ok;
286  }  }
287    
288    sub rebuildDbAndSchema {
289      my $self = shift;
290      $logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );
291      my @results;
292    
293      # sum up results (bool (0/1)) in array
294      push @results, $self->retreatSchema();
295      push @results, $self->{dataStorageLayer}->dropDb();
296      push @results, $self->{dataStorageLayer}->createDb();
297      push @results, $self->deploySchema();
298    
299      # scan array for "bad ones"
300      my $res = 1;
301      map {
302        $res = 0 if (!$_);
303      } @results;
304      
305      return $res;
306    }
307    
308    sub getListUnfiltered {
309      my $self = shift;
310      my $nodename = shift;
311      my @results;
312      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
313      # get set of objects from odbms by object name
314      my $object_set = $self->{COREHANDLE}->remote($nodename);
315      @results = $self->{COREHANDLE}->select($object_set);
316      return \@results;
317    }
318    
319    sub getListFiltered {
320      my $self = shift;
321    
322      # redirect to unfiltered mode
323      #return $self->getListUnfiltered(@_);
324    
325      my $nodename = shift;
326      my $filters = shift;
327      my @results;
328      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
329    
330      #print Dumper($filters);
331      
332      my @tfilters;
333      
334      foreach my $filter (@$filters) {
335      
336        # get filter - TODO: for each filter
337        #my $filter = $filters->[0];
338      
339        # build filter
340        my $lexpr = $filter->{key};
341        #my $op = $filter->{op};
342        my $op = '=';
343        my $rexpr = $filter->{val};
344        my $tight = 100;
345        
346      #  my $tfilter = Tangram::Filter->new(
347      #    expr => "t1.$lexpr $op '$rexpr'",
348      #    tight => $tight,
349      #    objects => $objects,
350      #  );
351      
352        # HACK: build eval-string (sorry) to get filtered list - please give advice here
353        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
354    
355      }
356    
357      my $tfilter = join(' & ', @tfilters);
358    
359      # get set of objects from odbms by object name
360      my $remote = $self->{COREHANDLE}->remote($nodename);
361      
362      # was:
363      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
364    
365      # is:
366      # HACK: build eval-string (sorry) to get filtered list - please give advice here
367      my $evalstring = 'return $self->{COREHANDLE}->select($remote, ' . $tfilter . ');';
368      
369      # get filtered list/set
370      @results = eval($evalstring);
371      die $@ if $@;
372      
373      return \@results;
374    }
375    
376    sub createCursor {
377      my $self = shift;
378      my $node = shift;
379      my $cmdHandle = $self->{COREHANDLE}->cursor($node);
380      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
381      return $result;
382    }
383    
384    sub createSet {
385      my $self = shift;
386      my @objects = @_;
387      my $rh = Set::Object->new();
388      foreach (@objects) {
389        #print Dumper($_);
390        $rh->insert($_) if !isEmpty($_);
391      }
392      #print Dumper($rh->members());
393      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
394      return $result;
395    }
396    
397    sub sendQuery {
398      my $self = shift;
399      my $query = shift;
400      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
401      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
402    
403      #print Dumper($query);
404    
405      # HACK: special case: querying by id does not translate into a common tangram query
406      # just load the object by given id(ent)
407      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
408        #print "LOAD!!!", "\n";
409        #exit;
410        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
411        my $ident = $query->{criterias}->[0]->{val};
412    #print "load obj", "\n";
413        #return $self->createSet() if $ident == 5;
414        my $object = $self->{COREHANDLE}->load($ident);
415    #print "get id", "\n";
416        my $oid = $self->{COREHANDLE}->id($object);
417        return $self->createSet($object);
418        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
419      }
420    
421      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
422    
423      # TODO: do a common tangram query here
424    
425      my @crits;
426      foreach (@{$query->{criterias}}) {
427        my $op = '';
428        $op = '=' if lc $_->{op} eq 'eq';
429        push @crits, "$_->{key}$op'$_->{val}'";
430      }
431      my $subnodes = {};
432      map { $subnodes->{$_}++ } @{$query->{subnodes}};
433      # HACK: this is hardcoded ;(    expand possibilities!
434      #my $crit = join(' AND ', @crits);
435      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
436      #return $self->sendCommand($sql);
437      #my $h = $self->{COREHANDLE}->remote($query->{node});
438      #my $res = $self->{COREHANDLE}->select($h, $h->{);
439      return $self->createCursor($query->{node});
440    }
441    
442  1;  1;
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