/[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 1.8 by joko, Sun Dec 1 22:25:51 2002 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.8  2002/12/01 22:25:51  joko
7    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
8    #
9    #  Revision 1.7  2002/12/01 04:46:19  joko
10    #  + sub eraseAll
11    #
12    #  Revision 1.6  2002/11/29 05:02:30  joko
13    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
14    #  + sub getMetaInfo
15    #  - sub existsChildNode (moved to Abstract.pm)
16    #  + sub getListUnfiltered
17    #  + sub getListFiltered
18    #  + sub createCursor
19    #  + sub createSet
20    #  + sub sendQuery
21    #
22  #  Revision 1.5  2002/11/17 06:35:18  joko  #  Revision 1.5  2002/11/17 06:35:18  joko
23  #  + locator metadata can now be reached via ->{locator}  #  + locator metadata can now be reached via ->{locator}
24  #  - getChildNodes is now wrapped via COREHANDLE  #  - getChildNodes is now wrapped via COREHANDLE
# Line 25  Line 41 
41  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
42  #  + new  #  + new
43  #  #
44  #  ############################################
45  #################################  
46    
47  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
48    
# Line 37  use base ("Data::Storage::Handler::Abstr Line 53  use base ("Data::Storage::Handler::Abstr
53    
54  use Tangram;  use Tangram;
55  use Data::Dumper;  use Data::Dumper;
56    use libp qw( getNewPerlObjectByPkgName );
57    use Data::Storage::Result::Tangram;
58    use Data::Compare::Struct qw( isEmpty );
59    
60  # get logger instance  # get logger instance
61  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
62    
63    
64  our $metainfo = {  sub getMetaInfo {
65    'disconnectMethod' => 'disconnect',    my $self = shift;
66  };    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
67      return {
68  sub getNewPerlObjectByPkgName {      'disconnectMethod' => 'disconnect',
69    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);  
70  }  }
71    
72  sub _initSchema {  sub _initSchema {
# Line 90  sub connect { Line 103  sub connect {
103    
104      return unless $self->_initSchema();      return unless $self->_initSchema();
105    
106        # create the main tangram storage object
107      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
108      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );
109        
110        # some attempts for configuring the wrapped underlying dbi.....
111      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
112      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
113      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
114        
115        # ..... encapsulation wins!
116      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
117    
118    $self->{locator}->{status}->{connected} = 1;    $self->{locator}->{status}->{connected} = 1;
# Line 114  sub getChildNodes { Line 131  sub getChildNodes {
131    # 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
132    #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} });
133    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
134      
135      # todo: should we retrieve information from the schema here
136      # rather than poorly getting table names from underlying dbi?
137    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
138    @nodes = @{$storage->getChildNodes()};    @nodes = @{$storage->getChildNodes()};
139    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
# Line 121  sub getChildNodes { Line 141  sub getChildNodes {
141  #print Dumper($self);  #print Dumper($self);
142    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
143        
144    $storage->disconnect();    # TODO: REVIEW
145      #$storage->disconnect();
146        
147    $self->{meta}->{childnodes} = \@nodes;    $self->{meta}->{childnodes} = \@nodes;
148        
# Line 130  sub getChildNodes { Line 151  sub getChildNodes {
151  }  }
152    
153    
 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}};  
 }  
   
   
154  sub testIntegrity {  sub testIntegrity {
155    
156    my $self = shift;    my $self = shift;
# Line 235  sub deploySchema { Line 246  sub deploySchema {
246    my $args = shift;    my $args = shift;
247        
248    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   #my $dsn = $self->{dbi}->{dsn};  
249    
250    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
251    
252    my $ok;    my $ok;
253    # 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,  
                                                     } ) ) {  
   
254      return unless $self->_initSchema();      return unless $self->_initSchema();
       
255      $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );
256      $dbh->disconnect();      $dbh->disconnect();
257    }    }
# Line 257  sub retreatSchema { Line 262  sub retreatSchema {
262    
263    my $self = shift;    my $self = shift;
264    my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   #my $dsn = $self->{dbi}->{dsn};  
265    
266    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );    $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, '', '', $self->{locator}->{dbi} ) ) {
                                                       #PrintError => 0,  
                                                       #RaiseError => 0,  
                                                     } ) ) {  
270    
271      return unless $self->_initSchema();      return unless $self->_initSchema();
272            
# Line 273  sub retreatSchema { Line 274  sub retreatSchema {
274      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
275            
276      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );
277      $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status  
278                      # idea: test this by checking for count of tables in database -      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
279                      #          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
280        # - possible improvement:
281        #   - 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        #   - maybe better: use "->getChildNodes"?
284        $ok = 2;
285    
286      $dbh->disconnect();      $dbh->disconnect();
287    
288    }    }
289    return $ok;    return $ok;
290  }  }
# Line 301  sub rebuildDbAndSchema { Line 309  sub rebuildDbAndSchema {
309    return $res;    return $res;
310  }  }
311    
312    sub getListUnfiltered {
313      my $self = shift;
314      my $nodename = shift;
315      my @results;
316      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
317      # get set of objects from odbms by object name
318      my $object_set = $self->{COREHANDLE}->remote($nodename);
319      @results = $self->{COREHANDLE}->select($object_set);
320      return \@results;
321    }
322    
323    sub getListFiltered {
324      my $self = shift;
325    
326      # redirect to unfiltered mode
327      #return $self->getListUnfiltered(@_);
328    
329      my $nodename = shift;
330      my $filters = shift;
331      my @results;
332      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
333    
334      #print Dumper($filters);
335      
336      my @tfilters;
337      
338      foreach my $filter (@$filters) {
339      
340        # get filter - TODO: for each filter
341        #my $filter = $filters->[0];
342      
343        # build filter
344        my $lexpr = $filter->{key};
345        #my $op = $filter->{op};
346        my $op = '=';
347        my $rexpr = $filter->{val};
348        my $tight = 100;
349        
350      #  my $tfilter = Tangram::Filter->new(
351      #    expr => "t1.$lexpr $op '$rexpr'",
352      #    tight => $tight,
353      #    objects => $objects,
354      #  );
355      
356        # HACK: build eval-string (sorry) to get filtered list - please give advice here
357        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
358    
359      }
360    
361      my $tfilter = join(' & ', @tfilters);
362    
363      # get set of objects from odbms by object name
364      my $remote = $self->{COREHANDLE}->remote($nodename);
365      
366      # was:
367      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
368    
369      # is:
370      # HACK: build eval-string (sorry) to get filtered list - please give advice here
371      my $evalstring = 'return $self->{COREHANDLE}->select($remote, ' . $tfilter . ');';
372      
373      # get filtered list/set
374      @results = eval($evalstring);
375      die $@ if $@;
376      
377      return \@results;
378    }
379    
380    sub createCursor {
381      my $self = shift;
382      my $node = shift;
383      my $cmdHandle = $self->{COREHANDLE}->cursor($node);
384      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
385      return $result;
386    }
387    
388    sub createSet {
389      my $self = shift;
390      my @objects = @_;
391      my $rh = Set::Object->new();
392      foreach (@objects) {
393        #print Dumper($_);
394        $rh->insert($_) if !isEmpty($_);
395      }
396      #print Dumper($rh->members());
397      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
398      return $result;
399    }
400    
401    sub sendQuery {
402      my $self = shift;
403      my $query = shift;
404      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
405      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
406    
407      #print Dumper($query);
408    
409      # HACK: special case: querying by id does not translate into a common tangram query
410      # just load the object by given id(ent)
411      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
412        #print "LOAD!!!", "\n";
413        #exit;
414        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
415        my $ident = $query->{criterias}->[0]->{val};
416    #print "load obj", "\n";
417        #return $self->createSet() if $ident == 5;
418        my $object = $self->{COREHANDLE}->load($ident);
419    #print "get id", "\n";
420        my $oid = $self->{COREHANDLE}->id($object);
421        return $self->createSet($object);
422        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
423      }
424    
425      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
426    
427      # TODO: do a common tangram query here
428    
429      my @crits;
430      foreach (@{$query->{criterias}}) {
431        my $op = '';
432        $op = '=' if lc $_->{op} eq 'eq';
433        push @crits, "$_->{key}$op'$_->{val}'";
434      }
435      my $subnodes = {};
436      map { $subnodes->{$_}++ } @{$query->{subnodes}};
437      # HACK: this is hardcoded ;(    expand possibilities!
438      #my $crit = join(' AND ', @crits);
439      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
440      #return $self->sendCommand($sql);
441      #my $h = $self->{COREHANDLE}->remote($query->{node});
442      #my $res = $self->{COREHANDLE}->select($h, $h->{);
443      return $self->createCursor($query->{node});
444    }
445    
446    sub eraseAll {
447      my $self = shift;
448      my $classname = shift;
449      my $remote = $self->{storage}->remote($classname);
450      my @objs = $self->{storage}->select($remote);
451      $self->{COREHANDLE}->erase(@objs);
452    }
453    
454    sub createDb {
455      my $self = shift;
456      my $storage = $self->_getSubLayerHandle();
457      return $storage->createDb();
458    }
459    
460  1;  1;
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