Storage/Handler/Tangram.pm

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