/[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 1.7 by joko, Sun Dec 1 04:46:19 2002 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.7  2002/12/01 04:46:19  joko
7    #  + sub eraseAll
8    #
9    #  Revision 1.6  2002/11/29 05:02:30  joko
10    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
11    #  + sub getMetaInfo
12    #  - sub existsChildNode (moved to Abstract.pm)
13    #  + sub getListUnfiltered
14    #  + sub getListFiltered
15    #  + sub createCursor
16    #  + sub createSet
17    #  + sub sendQuery
18    #
19  #  Revision 1.5  2002/11/17 06:35:18  joko  #  Revision 1.5  2002/11/17 06:35:18  joko
20  #  + locator metadata can now be reached via ->{locator}  #  + locator metadata can now be reached via ->{locator}
21  #  - getChildNodes is now wrapped via COREHANDLE  #  - getChildNodes is now wrapped via COREHANDLE
# Line 25  Line 38 
38  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
39  #  + new  #  + new
40  #  #
41  #  ############################################
42  #################################  
43    
44  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
45    
# Line 37  use base ("Data::Storage::Handler::Abstr Line 50  use base ("Data::Storage::Handler::Abstr
50    
51  use Tangram;  use Tangram;
52  use Data::Dumper;  use Data::Dumper;
53    use libp qw( getNewPerlObjectByPkgName );
54    use Data::Storage::Result::Tangram;
55    use Data::Compare::Struct qw( isEmpty );
56    
57  # get logger instance  # get logger instance
58  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
59    
60    
61  our $metainfo = {  sub getMetaInfo {
62    'disconnectMethod' => 'disconnect',    my $self = shift;
63  };    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
64      return {
65  sub getNewPerlObjectByPkgName {      'disconnectMethod' => 'disconnect',
66    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);  
67  }  }
68    
69  sub _initSchema {  sub _initSchema {
# Line 90  sub connect { Line 100  sub connect {
100    
101      return unless $self->_initSchema();      return unless $self->_initSchema();
102    
103        # create the main tangram storage object
104      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
105      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );
106        
107        # some attempts for configuring the wrapped underlying dbi.....
108      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
109      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
110      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
111        
112        # ..... encapsulation wins!
113      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
114    
115    $self->{locator}->{status}->{connected} = 1;    $self->{locator}->{status}->{connected} = 1;
# Line 114  sub getChildNodes { Line 128  sub getChildNodes {
128    # 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
129    #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} });
130    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
131      
132      # todo: should we retrieve information from the schema here
133      # rather than poorly getting table names from underlying dbi?
134    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
135    @nodes = @{$storage->getChildNodes()};    @nodes = @{$storage->getChildNodes()};
136    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
# Line 130  sub getChildNodes { Line 147  sub getChildNodes {
147  }  }
148    
149    
 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}};  
 }  
   
   
150  sub testIntegrity {  sub testIntegrity {
151    
152    my $self = shift;    my $self = shift;
# Line 301  sub rebuildDbAndSchema { Line 308  sub rebuildDbAndSchema {
308    return $res;    return $res;
309  }  }
310    
311    sub getListUnfiltered {
312      my $self = shift;
313      my $nodename = shift;
314      my @results;
315      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
316      # get set of objects from odbms by object name
317      my $object_set = $self->{COREHANDLE}->remote($nodename);
318      @results = $self->{COREHANDLE}->select($object_set);
319      return \@results;
320    }
321    
322    sub getListFiltered {
323      my $self = shift;
324    
325      # redirect to unfiltered mode
326      #return $self->getListUnfiltered(@_);
327    
328      my $nodename = shift;
329      my $filters = shift;
330      my @results;
331      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
332    
333      #print Dumper($filters);
334      
335      my @tfilters;
336      
337      foreach my $filter (@$filters) {
338      
339        # get filter - TODO: for each filter
340        #my $filter = $filters->[0];
341      
342        # build filter
343        my $lexpr = $filter->{key};
344        #my $op = $filter->{op};
345        my $op = '=';
346        my $rexpr = $filter->{val};
347        my $tight = 100;
348        
349      #  my $tfilter = Tangram::Filter->new(
350      #    expr => "t1.$lexpr $op '$rexpr'",
351      #    tight => $tight,
352      #    objects => $objects,
353      #  );
354      
355        # HACK: build eval-string (sorry) to get filtered list - please give advice here
356        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
357    
358      }
359    
360      my $tfilter = join(' & ', @tfilters);
361    
362      # get set of objects from odbms by object name
363      my $remote = $self->{COREHANDLE}->remote($nodename);
364      
365      # was:
366      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
367    
368      # is:
369      # HACK: build eval-string (sorry) to get filtered list - please give advice here
370      my $evalstring = 'return $self->{COREHANDLE}->select($remote, ' . $tfilter . ');';
371      
372      # get filtered list/set
373      @results = eval($evalstring);
374      die $@ if $@;
375      
376      return \@results;
377    }
378    
379    sub createCursor {
380      my $self = shift;
381      my $node = shift;
382      my $cmdHandle = $self->{COREHANDLE}->cursor($node);
383      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
384      return $result;
385    }
386    
387    sub createSet {
388      my $self = shift;
389      my @objects = @_;
390      my $rh = Set::Object->new();
391      foreach (@objects) {
392        #print Dumper($_);
393        $rh->insert($_) if !isEmpty($_);
394      }
395      #print Dumper($rh->members());
396      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
397      return $result;
398    }
399    
400    sub sendQuery {
401      my $self = shift;
402      my $query = shift;
403      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
404      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
405    
406      #print Dumper($query);
407    
408      # HACK: special case: querying by id does not translate into a common tangram query
409      # just load the object by given id(ent)
410      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
411        #print "LOAD!!!", "\n";
412        #exit;
413        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
414        my $ident = $query->{criterias}->[0]->{val};
415    #print "load obj", "\n";
416        #return $self->createSet() if $ident == 5;
417        my $object = $self->{COREHANDLE}->load($ident);
418    #print "get id", "\n";
419        my $oid = $self->{COREHANDLE}->id($object);
420        return $self->createSet($object);
421        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
422      }
423    
424      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
425    
426      # TODO: do a common tangram query here
427    
428      my @crits;
429      foreach (@{$query->{criterias}}) {
430        my $op = '';
431        $op = '=' if lc $_->{op} eq 'eq';
432        push @crits, "$_->{key}$op'$_->{val}'";
433      }
434      my $subnodes = {};
435      map { $subnodes->{$_}++ } @{$query->{subnodes}};
436      # HACK: this is hardcoded ;(    expand possibilities!
437      #my $crit = join(' AND ', @crits);
438      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
439      #return $self->sendCommand($sql);
440      #my $h = $self->{COREHANDLE}->remote($query->{node});
441      #my $res = $self->{COREHANDLE}->select($h, $h->{);
442      return $self->createCursor($query->{node});
443    }
444    
445    sub eraseAll {
446      my $self = shift;
447      my $classname = shift;
448      my $remote = $self->{storage}->remote($classname);
449      my @objs = $self->{storage}->select($remote);
450      $self->{COREHANDLE}->erase(@objs);
451    }
452    
453  1;  1;
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