/[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 1.6 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  #  Revision 1.5  2002/11/17 06:35:18  joko
17  #  + locator metadata can now be reached via ->{locator}  #  + locator metadata can now be reached via ->{locator}
18  #  - getChildNodes is now wrapped via COREHANDLE  #  - getChildNodes is now wrapped via COREHANDLE
# Line 25  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 37  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  sub getNewPerlObjectByPkgName {      'disconnectMethod' => 'disconnect',
63    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);  
64  }  }
65    
66  sub _initSchema {  sub _initSchema {
# Line 90  sub connect { Line 97  sub connect {
97    
98      return unless $self->_initSchema();      return unless $self->_initSchema();
99    
100        # create the main tangram storage object
101      #$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;    $self->{locator}->{status}->{connected} = 1;
# Line 114  sub getChildNodes { Line 125  sub getChildNodes {
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()};    @nodes = @{$storage->getChildNodes()};
133    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
# Line 130  sub getChildNodes { Line 144  sub getChildNodes {
144  }  }
145    
146    
 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}};  
 }  
   
   
147  sub testIntegrity {  sub testIntegrity {
148    
149    my $self = shift;    my $self = shift;
# Line 301  sub rebuildDbAndSchema { Line 305  sub rebuildDbAndSchema {
305    return $res;    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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