Storage/Handler/Tangram.pm

############################################
#
#  $Id: Tangram.pm,v 1.17 2002/12/12 02:51:09 joko Exp $
#
#  $Log: Tangram.pm,v $
#  Revision 1.17  2002/12/12 02:51:09  joko
#  + cosmetics
#
#  Revision 1.16  2002/12/11 06:54:10  joko
#  + fix: encapsulated object-loading inside an 'eval'
#
#  Revision 1.15  2002/12/05 13:55:21  joko
#  + now utilizing 'object2hash' instead of 'var_deref'
#  + played around with having fresh-objects - no progress....
#
#  Revision 1.14  2002/12/05 09:40:30  jonen
#  + added option->{destroy} at getObject for unloading all instance
#
#  Revision 1.13  2002/12/05 07:59:04  joko
#  + now using Tie::SecureHash as a base for the COREHANDLE
#  + former public COREHANDLE becomes private _COREHANDLE now
#  + sub getCOREHANDLE
#
#  Revision 1.12  2002/12/04 11:34:49  joko
#  - $schema_tangram doesn't have to be in class?
#
#  Revision 1.11  2002/12/04 08:54:08  jonen
#  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
#
#  Revision 1.10  2002/12/03 15:53:23  joko
#  + small bugfix regarding object hierarchy
#
#  Revision 1.9  2002/12/03 05:29:40  joko
#  + sub getObject
#  + sub getObjectAsHash
#
#  Revision 1.8  2002/12/01 22:25:51  joko
#  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
#
#  Revision 1.7  2002/12/01 04:46:19  joko
#  + sub eraseAll
#
#  Revision 1.6  2002/11/29 05:02:30  joko
#  - sub getNewPerlObjectByPkgName (moved to libp.pm)
#  + sub getMetaInfo
#  - sub existsChildNode (moved to Abstract.pm)
#  + sub getListUnfiltered
#  + sub getListFiltered
#  + sub createCursor
#  + sub createSet
#  + sub sendQuery
#
#  Revision 1.5  2002/11/17 06:35:18  joko
#  + locator metadata can now be reached via ->{locator}
#  - getChildNodes is now wrapped via COREHANDLE
#
#  Revision 1.4  2002/10/25 11:44:44  joko
#  + sub _initSchema
#  + sub existsChildNode
#  + sub testIntegrity
#  + sub rebuildDbAndSchema
#
#  Revision 1.3  2002/10/17 03:56:55  joko
#  + bugfix: trapped eval error
#
#  Revision 1.2  2002/10/17 00:10:05  joko
#  + removed dependency from tsobj.pm, schema is now independent
#  + sub getNewPerlObjectByPkgName
#  + sub deploySchema
#  + sub retreatSchema
#
#  Revision 1.1  2002/10/10 03:44:07  cvsjoko
#  + new
#
############################################


package Data::Storage::Handler::Tangram;

use strict;
use warnings;

use base ("Data::Storage::Handler");
use base ("Data::Storage::Handler::Abstract");

use Tangram;
use Data::Dumper;
use libp qw( getNewPerlObjectByPkgName );
use Data::Storage::Result::Tangram;
use Data::Compare::Struct qw( isEmpty );
use Data::Transform::Deep qw( object2hash );
use Data::Transform::Encode qw( var2utf8 );


# get logger instance
my $logger = Log::Dispatch::Config->instance;


# this holds the complete instantiated schema from tangram
my $schema_tangram;

sub getMetaInfo {
  my $self = shift;
  $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
  return {
    'disconnectMethod' => 'disconnect',
  };
}

sub _initSchema {
  my $self = shift;
  $logger->debug( __PACKAGE__ . "->_initSchema()" );
  #if (!$schema_tangram) {
    my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
    $schema_tangram = $obj->getSchema();
  #}
  if (!$schema_tangram) {
    $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
    return 0;
  }
  return 1;
}

sub connect {

    my $self = shift;
    
    my $dsn = shift;
    $dsn ||= $self->{locator}->{dbi}->{dsn};
    
    $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
    
    #my $storage = Tangram::Relational->connect( $schema, $dsn );
    #my $storage = Tangram::mysql->connect( $schema, $dsn );
    #$storage = Tangram::Relational->connect( Project->schema, $dsn );
    
#    if (!testDsn($dsn)) {
#      croak("Database at \"$dsn\" is not available");
#      return;
#    }

    return unless $self->_initSchema();

    # create the main tangram storage object
    #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
    $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );

#print "connect", "\n";
#my $core = $self->{_COREHANDLE};
#print Dumper($core);
  
    # some attempts for configuring the wrapped underlying dbi.....
    #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
    #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
    #$self->_configureUnderlyingStorage;
    
    # ..... encapsulation wins!
    $self->configureCOREHANDLE();

  $self->{locator}->{status}->{connected} = 1;

  return 1;

}

sub getChildNodes {

  my $self = shift;
  my @nodes;

  $logger->debug( __PACKAGE__ . "->getChildNodes()" );

  # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
  #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
  #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
  
  # todo: should we retrieve information from the schema here
  # rather than poorly getting table names from underlying dbi?
  my $storage = $self->_getSubLayerHandle();
  @nodes = @{$storage->getChildNodes()};
  #$storage->_configureCOREHANDLE();
#print "getchildnodes\n";
#print Dumper($self);
  #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
  
  # TODO: REVIEW
  #$storage->disconnect();
  
  $self->{meta}->{childnodes} = \@nodes;
  
  return \@nodes;

}


sub testIntegrity {

  my $self = shift;

  $logger->debug( __PACKAGE__ . "->testIntegrity()" );

  # 1st test: are there tables?
  if (!$self->getChildNodes()) {
    $logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
    return;
  }

  # 2nd test: is there a table named "Tangram"?
  if (!$self->existsChildNode("Tangram")) {
    $logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
    return;
  }

  $self->{locator}->{status}->{integrity} = 1;
  return 1;

}


sub _getSubLayerHandle {
  
  my $self = shift;
  
  $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );

  #print Dumper($self);

  # hack, make more generic!
  if (!$self->{dataStorageLayer}) {
    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
    #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
    my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
    $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
    #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
    #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
  }
  
  #print Dumper($self->{STORAGE_UNDER_THE_HOOD});
  
  return $self->{dataStorageLayer};
  
}

sub _configureUnderlyingStorage {
  
  my $self = shift;

  $logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );

  $self->_configureCOREHANDLE_DBI();
  return;
  
  foreach my $key (keys %{$self->{dbi}}) {
    my $val = $self->{dbi}->{$key};
    print "entry: $key; $val", "\n";
    $self->{_COREHANDLE}->{db}->{$key} = $val;
  }
  #print Dumper($self->{COREHANDLE}->{db});
}


sub configureCOREHANDLE {

  my $self = shift;

  $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );

  #my $subLayer = $self->_getSubLayerHandle();

  # apply configured modifications
    if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
      $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
    }
    if (exists $self->{dbi}->{RaiseError}) {
      $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
    }
    if (exists $self->{dbi}->{PrintError}) {
      $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
    }
    if (exists $self->{dbi}->{HandleError}) {
      $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
    }

}

sub deploySchema {
  my $self = shift;
  my $args = shift;
  
  my $dsn = $self->{locator}->{dbi}->{dsn};

  $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );

  my $ok;
  if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
    return unless $self->_initSchema();
    $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
    $dbh->disconnect();
  }
  return $ok;
}

sub retreatSchema {

  my $self = shift;
  my $dsn = $self->{locator}->{dbi}->{dsn};

  $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );

  my $ok;
  if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {

    return unless $self->_initSchema();
    
    #use Data::Dumper; print Dumper($self);
    $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
    
    $ok = Tangram::Relational->retreat($schema_tangram, $dbh );

    # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
    # - ... Tangram::Relational->retreat doesn't seem to return a valid status
    # - possible improvement:
    #   - test this by checking for count of tables in database
    #   - problem with this: there may be some left not having been included to the schema
    #   - maybe better: use "->getChildNodes"?
    $ok = 2;

    $dbh->disconnect();

  }
  return $ok;
}

sub rebuildDbAndSchema {
  my $self = shift;
  $logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );
  my @results;

  # sum up results (bool (0/1)) in array
  push @results, $self->retreatSchema();
  push @results, $self->{dataStorageLayer}->dropDb();
  push @results, $self->{dataStorageLayer}->createDb();
  push @results, $self->deploySchema();

  # scan array for "bad ones"
  my $res = 1;
  map {
    $res = 0 if (!$_);
  } @results;
  
  return $res;
}

sub getListUnfiltered {
  my $self = shift;
  my $nodename = shift;
  my @results;
  $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
  # get set of objects from odbms by object name
  my $object_set = $self->{_COREHANDLE}->remote($nodename);
  @results = $self->{_COREHANDLE}->select($object_set);
  return \@results;
}

sub getListFiltered {
  my $self = shift;

  # redirect to unfiltered mode
  #return $self->getListUnfiltered(@_);

  my $nodename = shift;
  my $filters = shift;
  my @results;
  $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );

  #print Dumper($filters);
  
  my @tfilters;
  
  foreach my $filter (@$filters) {
  
    # get filter - TODO: for each filter
    #my $filter = $filters->[0];
  
    # build filter
    my $lexpr = $filter->{key};
    #my $op = $filter->{op};
    my $op = '=';
    my $rexpr = $filter->{val};
    my $tight = 100;
    
  #  my $tfilter = Tangram::Filter->new(
  #    expr => "t1.$lexpr $op '$rexpr'",
  #    tight => $tight,
  #    objects => $objects,
  #  );
  
    # HACK: build eval-string (sorry) to get filtered list - please give advice here
    push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";

  }

  my $tfilter = join(' & ', @tfilters);

  # get set of objects from odbms by object name
  my $remote = $self->{_COREHANDLE}->remote($nodename);
  
  # was:
  #@results = $self->{COREHANDLE}->select($object_set, $tfilter);

  # is:
  # HACK: build eval-string (sorry) to get filtered list - please give advice here
  my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
  
  # get filtered list/set
  @results = eval($evalstring);
  die $@ if $@;
  
  return \@results;
}

sub createCursor {
  my $self = shift;
  my $node = shift;
  my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
  my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
  return $result;
}

sub createSet {
  my $self = shift;
#print "-" x 80, "\n";
#print Dumper(@_);
  my @objects = @_;
  my $rh = Set::Object->new();
  foreach (@objects) {
    if (!isEmpty($_)) {
#print Dumper($_);
      $rh->insert($_);
    }
  }
  #print Dumper($rh->members());
  my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
  return $result;
}

sub sendQuery {
  my $self = shift;
  my $query = shift;
  #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
  #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);

  #print Dumper($query);

  # HACK: special case: querying by id does not translate into a common tangram query
  # just load the object by given id(ent)
  if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
    #print "LOAD!!!", "\n";
    #exit;
    #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
    my $ident = $query->{criterias}->[0]->{val};
#print "load obj", "\n";
    #return $self->createSet() if $ident == 5;
    $self->{_COREHANDLE}->unload($ident);
    my $object = $self->{_COREHANDLE}->load($ident);
#print "get id", "\n";
    my $oid = $self->{_COREHANDLE}->id($object);
#print Dumper($object);
#print "oid: $oid", "\n";
    return $self->createSet($object);
    #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
  }

  die("This should not be reached for now - redirect to \$self->getListFiltered() here!");

  # TODO: do a common tangram query here

  my @crits;
  foreach (@{$query->{criterias}}) {
    my $op = '';
    $op = '=' if lc $_->{op} eq 'eq';
    push @crits, "$_->{key}$op'$_->{val}'";
  }
  my $subnodes = {};
  map { $subnodes->{$_}++ } @{$query->{subnodes}};
  # HACK: this is hardcoded ;(    expand possibilities!
  #my $crit = join(' AND ', @crits);
  #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
  #return $self->sendCommand($sql);
  #my $h = $self->{COREHANDLE}->remote($query->{node});
  #my $res = $self->{COREHANDLE}->select($h, $h->{);
  return $self->createCursor($query->{node});
}

sub eraseAll {
  my $self = shift;
  my $classname = shift;
  my $remote = $self->{_COREHANDLE}->remote($classname);
  my @objs = $self->{_COREHANDLE}->select($remote);
  $self->{_COREHANDLE}->erase(@objs);
}

sub createDb {
  my $self = shift;
  my $storage = $self->_getSubLayerHandle();
  return $storage->createDb();
}

sub getObject {
  my $self = shift;
  my $oid = shift;
  my $options = shift;

  # TODO: create a deep_unload method (currently _all_ objects are unloaded)
  # unload($oid) will only unload object, not deep object hashes
  $self->{_COREHANDLE}->unload() if ($options->{destroy});

  # TODO: review this
  #if (!$self->{COREHANDLE}) { return; }

  # TODO: review this
  my $object = eval('$self->{_COREHANDLE}->load($oid);');
  print $@, "\n" if $@;

  return $object if $object;
}

sub getObjectAsHash {
  my $self = shift;
  my $oid = shift;
  my $options = shift;
  my $obj = $self->getObject($oid, $options);
  
  # build options (a callback to unload autovivified objects) for 'expand'
  # TODO: use $logger to write to debug here!
  my $cb; # = sub {};
=pod
  if ($options->{destroy}) {
    $options->{cb}->{destroy} = sub {
      print "================ DESTROY", "\n";
      my $object = shift;
      #print Dumper($object);
      $self->{_COREHANDLE}->unload($object);
      #undef($object);
    };
  }
=cut

  my $hash = object2hash($obj, $options);
  #$options->{cb}->{destroy}->($obj);
  #$self->{_COREHANDLE}->unload($obj);
  
  # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML
  # now done in object2hash
  #var2utf8($hash) if ($options->{utf8});
  
  # old (wrong) attempts to get rid of used instances, if requested
    #$obj->clear_refs;
    #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
    #$obj->DESTROY;
    #undef($obj) if($options->{destroy});
  
  return $hash;
}

sub getSchema {
  return $schema_tangram;
}

sub getCOREHANDLE {
  my $self = shift;
  return $self->{_COREHANDLE};
}

1;
1	joko	1.6	############################################
2	cvsjoko	1.1	#
3	joko	1.18	# $Id: Tangram.pm,v 1.17 2002/12/12 02:51:09 joko Exp $
4	joko	1.2	#
5			# $Log: Tangram.pm,v $
6	joko	1.18	# Revision 1.17 2002/12/12 02:51:09 joko
7			# + cosmetics
8			#
9	joko	1.17	# Revision 1.16 2002/12/11 06:54:10 joko
10			# + fix: encapsulated object-loading inside an 'eval'
11			#
12	joko	1.16	# Revision 1.15 2002/12/05 13:55:21 joko
13			# + now utilizing 'object2hash' instead of 'var_deref'
14			# + played around with having fresh-objects - no progress....
15			#
16	joko	1.15	# Revision 1.14 2002/12/05 09:40:30 jonen
17			# + added option->{destroy} at getObject for unloading all instance
18			#
19	jonen	1.14	# Revision 1.13 2002/12/05 07:59:04 joko
20			# + now using Tie::SecureHash as a base for the COREHANDLE
21			# + former public COREHANDLE becomes private _COREHANDLE now
22			# + sub getCOREHANDLE
23			#
24	joko	1.13	# Revision 1.12 2002/12/04 11:34:49 joko
25			# - $schema_tangram doesn't have to be in class?
26			#
27	joko	1.12	# Revision 1.11 2002/12/04 08:54:08 jonen
28			# + untested bugfix: undef($object) after transform to hash at getObjectAsHash
29			#
30	jonen	1.11	# Revision 1.10 2002/12/03 15:53:23 joko
31			# + small bugfix regarding object hierarchy
32			#
33	joko	1.10	# Revision 1.9 2002/12/03 05:29:40 joko
34			# + sub getObject
35			# + sub getObjectAsHash
36			#
37	joko	1.9	# Revision 1.8 2002/12/01 22:25:51 joko
38			# + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
39			#
40	joko	1.8	# Revision 1.7 2002/12/01 04:46:19 joko
41			# + sub eraseAll
42			#
43	joko	1.7	# Revision 1.6 2002/11/29 05:02:30 joko
44			# - sub getNewPerlObjectByPkgName (moved to libp.pm)
45			# + sub getMetaInfo
46			# - sub existsChildNode (moved to Abstract.pm)
47			# + sub getListUnfiltered
48			# + sub getListFiltered
49			# + sub createCursor
50			# + sub createSet
51			# + sub sendQuery
52			#
53	joko	1.6	# Revision 1.5 2002/11/17 06:35:18 joko
54			# + locator metadata can now be reached via ->{locator}
55			# - getChildNodes is now wrapped via COREHANDLE
56			#
57	joko	1.5	# Revision 1.4 2002/10/25 11:44:44 joko
58			# + sub _initSchema
59			# + sub existsChildNode
60			# + sub testIntegrity
61			# + sub rebuildDbAndSchema
62			#
63	joko	1.4	# Revision 1.3 2002/10/17 03:56:55 joko
64			# + bugfix: trapped eval error
65			#
66	joko	1.3	# Revision 1.2 2002/10/17 00:10:05 joko
67			# + removed dependency from tsobj.pm, schema is now independent
68			# + sub getNewPerlObjectByPkgName
69			# + sub deploySchema
70			# + sub retreatSchema
71			#
72	joko	1.2	# Revision 1.1 2002/10/10 03:44:07 cvsjoko
73			# + new
74	cvsjoko	1.1	#
75	joko	1.6	############################################
76
77	cvsjoko	1.1
78			package Data::Storage::Handler::Tangram;
79
80			use strict;
81			use warnings;
82
83	joko	1.13	use base ("Data::Storage::Handler");
84	cvsjoko	1.1	use base ("Data::Storage::Handler::Abstract");
85
86			use Tangram;
87			use Data::Dumper;
88	joko	1.6	use libp qw( getNewPerlObjectByPkgName );
89			use Data::Storage::Result::Tangram;
90			use Data::Compare::Struct qw( isEmpty );
91	joko	1.15	use Data::Transform::Deep qw( object2hash );
92	joko	1.9	use Data::Transform::Encode qw( var2utf8 );
93
94	cvsjoko	1.1
95			# get logger instance
96			my $logger = Log::Dispatch::Config->instance;
97
98
99	joko	1.12	# this holds the complete instantiated schema from tangram
100			my $schema_tangram;
101
102	joko	1.6	sub getMetaInfo {
103			my $self = shift;
104			$logger->debug( __PACKAGE__ . "->getMetaInfo()" );
105			return {
106			'disconnectMethod' => 'disconnect',
107			};
108	joko	1.2	}
109
110	joko	1.4	sub _initSchema {
111			my $self = shift;
112			$logger->debug( __PACKAGE__ . "->_initSchema()" );
113	joko	1.12	#if (!$schema_tangram) {
114	joko	1.5	my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
115	joko	1.12	$schema_tangram = $obj->getSchema();
116	joko	1.4	#}
117	joko	1.12	if (!$schema_tangram) {
118	joko	1.4	$logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
119			return 0;
120			}
121			return 1;
122			}
123
124	cvsjoko	1.1	sub connect {
125
126			my $self = shift;
127
128			my $dsn = shift;
129	joko	1.5	$dsn \|\|= $self->{locator}->{dbi}->{dsn};
130	cvsjoko	1.1
131	joko	1.2	$logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
132	cvsjoko	1.1
133			#my $storage = Tangram::Relational->connect( $schema, $dsn );
134			#my $storage = Tangram::mysql->connect( $schema, $dsn );
135			#$storage = Tangram::Relational->connect( Project->schema, $dsn );
136
137			# if (!testDsn($dsn)) {
138			# croak("Database at \"$dsn\" is not available");
139			# return;
140			# }
141
142	joko	1.4	return unless $self->_initSchema();
143
144	joko	1.6	# create the main tangram storage object
145	joko	1.2	#$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
146	joko	1.13	$self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
147
148			#print "connect", "\n";
149			#my $core = $self->{_COREHANDLE};
150			#print Dumper($core);
151	cvsjoko	1.1
152	joko	1.6	# some attempts for configuring the wrapped underlying dbi.....
153	cvsjoko	1.1	#$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
154			#$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
155			#$self->_configureUnderlyingStorage;
156	joko	1.6
157			# ..... encapsulation wins!
158	cvsjoko	1.1	$self->configureCOREHANDLE();
159
160	joko	1.5	$self->{locator}->{status}->{connected} = 1;
161
162	joko	1.4	return 1;
163
164	cvsjoko	1.1	}
165
166			sub getChildNodes {
167
168			my $self = shift;
169			my @nodes;
170
171	joko	1.4	$logger->debug( __PACKAGE__ . "->getChildNodes()" );
172
173	cvsjoko	1.1	# create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
174			#my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
175			#my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
176	joko	1.6
177			# todo: should we retrieve information from the schema here
178			# rather than poorly getting table names from underlying dbi?
179	cvsjoko	1.1	my $storage = $self->_getSubLayerHandle();
180	joko	1.5	@nodes = @{$storage->getChildNodes()};
181	cvsjoko	1.1	#$storage->_configureCOREHANDLE();
182	joko	1.5	#print "getchildnodes\n";
183			#print Dumper($self);
184	cvsjoko	1.1	#if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
185
186	joko	1.8	# TODO: REVIEW
187			#$storage->disconnect();
188	cvsjoko	1.1
189	joko	1.4	$self->{meta}->{childnodes} = \@nodes;
190
191	cvsjoko	1.1	return \@nodes;
192
193			}
194
195
196	joko	1.4	sub testIntegrity {
197
198			my $self = shift;
199
200			$logger->debug( __PACKAGE__ . "->testIntegrity()" );
201
202			# 1st test: are there tables?
203			if (!$self->getChildNodes()) {
204			$logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
205			return;
206			}
207
208			# 2nd test: is there a table named "Tangram"?
209			if (!$self->existsChildNode("Tangram")) {
210			$logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
211			return;
212			}
213
214	joko	1.5	$self->{locator}->{status}->{integrity} = 1;
215	joko	1.4	return 1;
216
217			}
218
219
220	cvsjoko	1.1	sub _getSubLayerHandle {
221
222			my $self = shift;
223
224	joko	1.4	$logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
225
226	cvsjoko	1.1	#print Dumper($self);
227	joko	1.5
228	cvsjoko	1.1	# hack, make more generic!
229	joko	1.4	if (!$self->{dataStorageLayer}) {
230			$logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
231			#my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
232	joko	1.5	my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
233	joko	1.4	$self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
234	cvsjoko	1.1	#$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
235			#$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
236			}
237
238			#print Dumper($self->{STORAGE_UNDER_THE_HOOD});
239
240	joko	1.4	return $self->{dataStorageLayer};
241	cvsjoko	1.1
242			}
243
244			sub _configureUnderlyingStorage {
245
246			my $self = shift;
247	joko	1.4
248			$logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );
249
250	cvsjoko	1.1	$self->_configureCOREHANDLE_DBI();
251			return;
252
253			foreach my $key (keys %{$self->{dbi}}) {
254			my $val = $self->{dbi}->{$key};
255			print "entry: $key; $val", "\n";
256	joko	1.13	$self->{_COREHANDLE}->{db}->{$key} = $val;
257	cvsjoko	1.1	}
258			#print Dumper($self->{COREHANDLE}->{db});
259			}
260
261
262			sub configureCOREHANDLE {
263
264			my $self = shift;
265
266	joko	1.4	$logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
267	cvsjoko	1.1
268			#my $subLayer = $self->_getSubLayerHandle();
269
270			# apply configured modifications
271			if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
272	joko	1.13	$self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
273	cvsjoko	1.1	}
274			if (exists $self->{dbi}->{RaiseError}) {
275	joko	1.13	$self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
276	cvsjoko	1.1	}
277			if (exists $self->{dbi}->{PrintError}) {
278	joko	1.13	$self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
279	cvsjoko	1.1	}
280			if (exists $self->{dbi}->{HandleError}) {
281	joko	1.13	$self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
282	cvsjoko	1.1	}
283
284	joko	1.2	}
285
286			sub deploySchema {
287			my $self = shift;
288	joko	1.5	my $args = shift;
289
290			my $dsn = $self->{locator}->{dbi}->{dsn};
291	joko	1.4
292			$logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
293
294	joko	1.2	my $ok;
295	joko	1.8	if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
296	joko	1.4	return unless $self->_initSchema();
297	joko	1.12	$ok = Tangram::Relational->deploy($schema_tangram, $dbh );
298	joko	1.2	$dbh->disconnect();
299			}
300			return $ok;
301			}
302
303			sub retreatSchema {
304	joko	1.4
305	joko	1.2	my $self = shift;
306	joko	1.5	my $dsn = $self->{locator}->{dbi}->{dsn};
307	joko	1.4
308			$logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
309
310	joko	1.2	my $ok;
311	joko	1.8	if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
312	joko	1.4
313			return unless $self->_initSchema();
314
315			#use Data::Dumper; print Dumper($self);
316			$self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
317
318	joko	1.12	$ok = Tangram::Relational->retreat($schema_tangram, $dbh );
319	joko	1.8
320			# answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
321			# - ... Tangram::Relational->retreat doesn't seem to return a valid status
322			# - possible improvement:
323			# - test this by checking for count of tables in database
324			# - problem with this: there may be some left not having been included to the schema
325			# - maybe better: use "->getChildNodes"?
326			$ok = 2;
327
328	joko	1.2	$dbh->disconnect();
329	joko	1.8
330	joko	1.2	}
331			return $ok;
332	joko	1.4	}
333
334			sub rebuildDbAndSchema {
335			my $self = shift;
336			$logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );
337			my @results;
338
339			# sum up results (bool (0/1)) in array
340			push @results, $self->retreatSchema();
341			push @results, $self->{dataStorageLayer}->dropDb();
342			push @results, $self->{dataStorageLayer}->createDb();
343			push @results, $self->deploySchema();
344
345			# scan array for "bad ones"
346			my $res = 1;
347			map {
348			$res = 0 if (!$_);
349			} @results;
350
351			return $res;
352	joko	1.6	}
353
354			sub getListUnfiltered {
355			my $self = shift;
356			my $nodename = shift;
357			my @results;
358			$logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
359			# get set of objects from odbms by object name
360	joko	1.13	my $object_set = $self->{_COREHANDLE}->remote($nodename);
361			@results = $self->{_COREHANDLE}->select($object_set);
362	joko	1.6	return \@results;
363			}
364
365			sub getListFiltered {
366			my $self = shift;
367
368			# redirect to unfiltered mode
369			#return $self->getListUnfiltered(@_);
370
371			my $nodename = shift;
372			my $filters = shift;
373			my @results;
374			$logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
375
376			#print Dumper($filters);
377
378			my @tfilters;
379
380			foreach my $filter (@$filters) {
381
382			# get filter - TODO: for each filter
383			#my $filter = $filters->[0];
384
385			# build filter
386			my $lexpr = $filter->{key};
387			#my $op = $filter->{op};
388			my $op = '=';
389			my $rexpr = $filter->{val};
390			my $tight = 100;
391
392			# my $tfilter = Tangram::Filter->new(
393			# expr => "t1.$lexpr $op '$rexpr'",
394			# tight => $tight,
395			# objects => $objects,
396			# );
397
398			# HACK: build eval-string (sorry) to get filtered list - please give advice here
399			push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
400
401			}
402
403			my $tfilter = join(' & ', @tfilters);
404
405			# get set of objects from odbms by object name
406	joko	1.13	my $remote = $self->{_COREHANDLE}->remote($nodename);
407	joko	1.6
408			# was:
409			#@results = $self->{COREHANDLE}->select($object_set, $tfilter);
410
411			# is:
412			# HACK: build eval-string (sorry) to get filtered list - please give advice here
413	joko	1.13	my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
414	joko	1.6
415			# get filtered list/set
416			@results = eval($evalstring);
417			die $@ if $@;
418
419			return \@results;
420			}
421
422			sub createCursor {
423			my $self = shift;
424			my $node = shift;
425	joko	1.13	my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
426	joko	1.6	my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
427			return $result;
428			}
429
430			sub createSet {
431			my $self = shift;
432	joko	1.18	#print "-" x 80, "\n";
433			#print Dumper(@_);
434	joko	1.6	my @objects = @_;
435			my $rh = Set::Object->new();
436			foreach (@objects) {
437	joko	1.18	if (!isEmpty($_)) {
438			#print Dumper($_);
439			$rh->insert($_);
440			}
441	joko	1.6	}
442			#print Dumper($rh->members());
443			my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
444			return $result;
445			}
446
447			sub sendQuery {
448			my $self = shift;
449			my $query = shift;
450			#my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
451			#my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
452
453			#print Dumper($query);
454
455			# HACK: special case: querying by id does not translate into a common tangram query
456			# just load the object by given id(ent)
457			if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
458			#print "LOAD!!!", "\n";
459			#exit;
460			#return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
461			my $ident = $query->{criterias}->[0]->{val};
462			#print "load obj", "\n";
463			#return $self->createSet() if $ident == 5;
464	joko	1.18	$self->{_COREHANDLE}->unload($ident);
465	joko	1.13	my $object = $self->{_COREHANDLE}->load($ident);
466	joko	1.6	#print "get id", "\n";
467	joko	1.13	my $oid = $self->{_COREHANDLE}->id($object);
468	joko	1.18	#print Dumper($object);
469			#print "oid: $oid", "\n";
470	joko	1.6	return $self->createSet($object);
471			#return $self->createSet( $self->{COREHANDLE}->load('300090018') );
472			}
473
474			die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
475
476			# TODO: do a common tangram query here
477
478			my @crits;
479			foreach (@{$query->{criterias}}) {
480			my $op = '';
481			$op = '=' if lc $_->{op} eq 'eq';
482			push @crits, "$_->{key}$op'$_->{val}'";
483			}
484			my $subnodes = {};
485			map { $subnodes->{$_}++ } @{$query->{subnodes}};
486			# HACK: this is hardcoded ;( expand possibilities!
487			#my $crit = join(' AND ', @crits);
488			#my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
489			#return $self->sendCommand($sql);
490			#my $h = $self->{COREHANDLE}->remote($query->{node});
491			#my $res = $self->{COREHANDLE}->select($h, $h->{);
492			return $self->createCursor($query->{node});
493	joko	1.7	}
494
495			sub eraseAll {
496			my $self = shift;
497			my $classname = shift;
498	joko	1.13	my $remote = $self->{_COREHANDLE}->remote($classname);
499			my @objs = $self->{_COREHANDLE}->select($remote);
500			$self->{_COREHANDLE}->erase(@objs);
501	joko	1.8	}
502
503			sub createDb {
504			my $self = shift;
505			my $storage = $self->_getSubLayerHandle();
506			return $storage->createDb();
507	joko	1.9	}
508
509			sub getObject {
510			my $self = shift;
511			my $oid = shift;
512	jonen	1.14	my $options = shift;
513	joko	1.16
514			# TODO: create a deep_unload method (currently _all_ objects are unloaded)
515	jonen	1.14	# unload($oid) will only unload object, not deep object hashes
516	joko	1.17	$self->{_COREHANDLE}->unload() if ($options->{destroy});
517	joko	1.16
518	joko	1.9	# TODO: review this
519			#if (!$self->{COREHANDLE}) { return; }
520	joko	1.16
521			# TODO: review this
522			my $object = eval('$self->{_COREHANDLE}->load($oid);');
523			print $@, "\n" if $@;
524
525			return $object if $object;
526	joko	1.9	}
527
528			sub getObjectAsHash {
529			my $self = shift;
530			my $oid = shift;
531			my $options = shift;
532	jonen	1.14	my $obj = $self->getObject($oid, $options);
533	joko	1.15
534			# build options (a callback to unload autovivified objects) for 'expand'
535			# TODO: use $logger to write to debug here!
536			my $cb; # = sub {};
537			=pod
538			if ($options->{destroy}) {
539			$options->{cb}->{destroy} = sub {
540			print "================ DESTROY", "\n";
541			my $object = shift;
542			#print Dumper($object);
543			$self->{_COREHANDLE}->unload($object);
544			#undef($object);
545			};
546			}
547			=cut
548
549			my $hash = object2hash($obj, $options);
550			#$options->{cb}->{destroy}->($obj);
551			#$self->{_COREHANDLE}->unload($obj);
552
553			# convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML
554			# now done in object2hash
555			#var2utf8($hash) if ($options->{utf8});
556
557			# old (wrong) attempts to get rid of used instances, if requested
558			#$obj->clear_refs;
559			#$self->{COREHANDLE}->unload($obj) if($options->{destroy});
560			#$obj->DESTROY;
561			#undef($obj) if($options->{destroy});
562
563			return $hash;
564	joko	1.12	}
565
566			sub getSchema {
567			return $schema_tangram;
568	joko	1.13	}
569
570			sub getCOREHANDLE {
571			my $self = shift;
572			return $self->{_COREHANDLE};
573	cvsjoko	1.1	}
574
575			1;
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