Storage/Handler/Tangram.pm

############################################
#
#  $Id: Tangram.pm,v 1.14 2002/12/05 09:40:30 jonen Exp $
#
#  $Log: Tangram.pm,v $
#  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 $options = shift;
  # TODO: create a deep_unload method
  # unload($oid) will only unload object, not deep object hashes
  $self->{_COREHANDLE}->unload() if($options->{destroy});
  # TODO: review this
  #if (!$self->{COREHANDLE}) { return; }
  return $self->{_COREHANDLE}->load($oid);
}

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