/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.5 by joko, Sun Nov 17 06:35:18 2002 UTC revision 1.9 by joko, Tue Dec 3 05:29:40 2002 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.9  2002/12/03 05:29:40  joko
7    #  + sub getObject
8    #  + sub getObjectAsHash
9    #
10    #  Revision 1.8  2002/12/01 22:25:51  joko
11    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
12    #
13    #  Revision 1.7  2002/12/01 04:46:19  joko
14    #  + sub eraseAll
15    #
16    #  Revision 1.6  2002/11/29 05:02:30  joko
17    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
18    #  + sub getMetaInfo
19    #  - sub existsChildNode (moved to Abstract.pm)
20    #  + sub getListUnfiltered
21    #  + sub getListFiltered
22    #  + sub createCursor
23    #  + sub createSet
24    #  + sub sendQuery
25    #
26  #  Revision 1.5  2002/11/17 06:35:18  joko  #  Revision 1.5  2002/11/17 06:35:18  joko
27  #  + locator metadata can now be reached via ->{locator}  #  + locator metadata can now be reached via ->{locator}
28  #  - getChildNodes is now wrapped via COREHANDLE  #  - getChildNodes is now wrapped via COREHANDLE
# Line 25  Line 45 
45  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
46  #  + new  #  + new
47  #  #
48  #  ############################################
49  #################################  
50    
51  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
52    
# Line 37  use base ("Data::Storage::Handler::Abstr Line 57  use base ("Data::Storage::Handler::Abstr
57    
58  use Tangram;  use Tangram;
59  use Data::Dumper;  use Data::Dumper;
60    use libp qw( getNewPerlObjectByPkgName );
61    use Data::Storage::Result::Tangram;
62    use Data::Compare::Struct qw( isEmpty );
63    use Data::Transform::Deep qw( var_deref );
64    use Data::Transform::Encode qw( var2utf8 );
65    
66    
67  # get logger instance  # get logger instance
68  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
69    
70    
71  our $metainfo = {  sub getMetaInfo {
72    'disconnectMethod' => 'disconnect',    my $self = shift;
73  };    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
74      return {
75  sub getNewPerlObjectByPkgName {      'disconnectMethod' => 'disconnect',
76    my $pkgname = shift;    };
   my $args = shift;  
   $logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );  
   my $evstring = "use $pkgname;";  
   eval($evstring);  
   $@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval $evstring: " .  $@ );  
   return $pkgname->new($args);  
77  }  }
78    
79  sub _initSchema {  sub _initSchema {
# Line 90  sub connect { Line 110  sub connect {
110    
111      return unless $self->_initSchema();      return unless $self->_initSchema();
112    
113        # create the main tangram storage object
114      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
115      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );
116        
117        # some attempts for configuring the wrapped underlying dbi.....
118      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
119      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
120      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
121        
122        # ..... encapsulation wins!
123      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
124    
125    $self->{locator}->{status}->{connected} = 1;    $self->{locator}->{status}->{connected} = 1;
# Line 114  sub getChildNodes { Line 138  sub getChildNodes {
138    # 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
139    #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} });
140    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
141      
142      # todo: should we retrieve information from the schema here
143      # rather than poorly getting table names from underlying dbi?
144    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
145    @nodes = @{$storage->getChildNodes()};    @nodes = @{$storage->getChildNodes()};
146    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
# Line 121  sub getChildNodes { Line 148  sub getChildNodes {
148  #print Dumper($self);  #print Dumper($self);
149    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
150        
151    $storage->disconnect();    # TODO: REVIEW
152      #$storage->disconnect();
153        
154    $self->{meta}->{childnodes} = \@nodes;    $self->{meta}->{childnodes} = \@nodes;
155        
# Line 130  sub getChildNodes { Line 158  sub getChildNodes {
158  }  }
159    
160    
 sub existsChildNode {  
   my $self = shift;  
   my $nodename = shift;  
   $logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" );  
   $self->getChildNodes() unless $self->{meta}->{childnodes};  
   #print Dumper($self->{meta}->{childnodes});  
   return grep $nodename, @{$self->{meta}->{childnodes}};  
 }  
   
   
161  sub testIntegrity {  sub testIntegrity {
162    
163    my $self = shift;    my $self = shift;
# Line 235  sub deploySchema { Line 253  sub deploySchema {
253    my $args = shift;    my $args = shift;
254        
255    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   #my $dsn = $self->{dbi}->{dsn};  
256    
257    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
258    
259    my $ok;    my $ok;
260    # TODO: is this DBI->connect okay here like it is? regarding errors.....???    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
   if ( my $dbh = DBI->connect($dsn, '', '', {  
                                                       PrintError => 0,  
                                                     } ) ) {  
   
261      return unless $self->_initSchema();      return unless $self->_initSchema();
       
262      $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );
263      $dbh->disconnect();      $dbh->disconnect();
264    }    }
# Line 257  sub retreatSchema { Line 269  sub retreatSchema {
269    
270    my $self = shift;    my $self = shift;
271    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   #my $dsn = $self->{dbi}->{dsn};  
272    
273    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
274    
275    my $ok;    my $ok;
276    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       #PrintError => 0,  
                                                       #RaiseError => 0,  
                                                     } ) ) {  
277    
278      return unless $self->_initSchema();      return unless $self->_initSchema();
279            
# Line 273  sub retreatSchema { Line 281  sub retreatSchema {
281      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
282            
283      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );
284      $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status  
285                      # idea: test this by checking for count of tables in database -      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
286                      #          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
287        # - possible improvement:
288        #   - test this by checking for count of tables in database
289        #   - problem with this: there may be some left not having been included to the schema
290        #   - maybe better: use "->getChildNodes"?
291        $ok = 2;
292    
293      $dbh->disconnect();      $dbh->disconnect();
294    
295    }    }
296    return $ok;    return $ok;
297  }  }
# Line 301  sub rebuildDbAndSchema { Line 316  sub rebuildDbAndSchema {
316    return $res;    return $res;
317  }  }
318    
319    sub getListUnfiltered {
320      my $self = shift;
321      my $nodename = shift;
322      my @results;
323      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
324      # get set of objects from odbms by object name
325      my $object_set = $self->{COREHANDLE}->remote($nodename);
326      @results = $self->{COREHANDLE}->select($object_set);
327      return \@results;
328    }
329    
330    sub getListFiltered {
331      my $self = shift;
332    
333      # redirect to unfiltered mode
334      #return $self->getListUnfiltered(@_);
335    
336      my $nodename = shift;
337      my $filters = shift;
338      my @results;
339      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
340    
341      #print Dumper($filters);
342      
343      my @tfilters;
344      
345      foreach my $filter (@$filters) {
346      
347        # get filter - TODO: for each filter
348        #my $filter = $filters->[0];
349      
350        # build filter
351        my $lexpr = $filter->{key};
352        #my $op = $filter->{op};
353        my $op = '=';
354        my $rexpr = $filter->{val};
355        my $tight = 100;
356        
357      #  my $tfilter = Tangram::Filter->new(
358      #    expr => "t1.$lexpr $op '$rexpr'",
359      #    tight => $tight,
360      #    objects => $objects,
361      #  );
362      
363        # HACK: build eval-string (sorry) to get filtered list - please give advice here
364        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
365    
366      }
367    
368      my $tfilter = join(' & ', @tfilters);
369    
370      # get set of objects from odbms by object name
371      my $remote = $self->{COREHANDLE}->remote($nodename);
372      
373      # was:
374      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
375    
376      # is:
377      # HACK: build eval-string (sorry) to get filtered list - please give advice here
378      my $evalstring = 'return $self->{COREHANDLE}->select($remote, ' . $tfilter . ');';
379      
380      # get filtered list/set
381      @results = eval($evalstring);
382      die $@ if $@;
383      
384      return \@results;
385    }
386    
387    sub createCursor {
388      my $self = shift;
389      my $node = shift;
390      my $cmdHandle = $self->{COREHANDLE}->cursor($node);
391      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
392      return $result;
393    }
394    
395    sub createSet {
396      my $self = shift;
397      my @objects = @_;
398      my $rh = Set::Object->new();
399      foreach (@objects) {
400        #print Dumper($_);
401        $rh->insert($_) if !isEmpty($_);
402      }
403      #print Dumper($rh->members());
404      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
405      return $result;
406    }
407    
408    sub sendQuery {
409      my $self = shift;
410      my $query = shift;
411      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
412      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
413    
414      #print Dumper($query);
415    
416      # HACK: special case: querying by id does not translate into a common tangram query
417      # just load the object by given id(ent)
418      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
419        #print "LOAD!!!", "\n";
420        #exit;
421        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
422        my $ident = $query->{criterias}->[0]->{val};
423    #print "load obj", "\n";
424        #return $self->createSet() if $ident == 5;
425        my $object = $self->{COREHANDLE}->load($ident);
426    #print "get id", "\n";
427        my $oid = $self->{COREHANDLE}->id($object);
428        return $self->createSet($object);
429        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
430      }
431    
432      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
433    
434      # TODO: do a common tangram query here
435    
436      my @crits;
437      foreach (@{$query->{criterias}}) {
438        my $op = '';
439        $op = '=' if lc $_->{op} eq 'eq';
440        push @crits, "$_->{key}$op'$_->{val}'";
441      }
442      my $subnodes = {};
443      map { $subnodes->{$_}++ } @{$query->{subnodes}};
444      # HACK: this is hardcoded ;(    expand possibilities!
445      #my $crit = join(' AND ', @crits);
446      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
447      #return $self->sendCommand($sql);
448      #my $h = $self->{COREHANDLE}->remote($query->{node});
449      #my $res = $self->{COREHANDLE}->select($h, $h->{);
450      return $self->createCursor($query->{node});
451    }
452    
453    sub eraseAll {
454      my $self = shift;
455      my $classname = shift;
456      my $remote = $self->{storage}->remote($classname);
457      my @objs = $self->{storage}->select($remote);
458      $self->{COREHANDLE}->erase(@objs);
459    }
460    
461    sub createDb {
462      my $self = shift;
463      my $storage = $self->_getSubLayerHandle();
464      return $storage->createDb();
465    }
466    
467    sub getObject {
468      my $self = shift;
469      my $oid = shift;
470      # TODO: review this
471      #if (!$self->{COREHANDLE}) { return; }
472      return $self->{COREHANDLE}->load($oid);
473    }
474    
475    sub getObjectAsHash {
476      my $self = shift;
477      my $oid = shift;
478      my $options = shift;
479      my $obj = $self->getObject($oid);
480      my $deref = var_deref($obj);
481      var2utf8($deref) if ($options->{utf8});
482      return $deref;
483    }
484    
485  1;  1;
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