Storage/Handler/Tangram.pm

#################################
#
#  $Id: Tangram.pm,v 1.3 2002/10/17 03:56:55 joko Exp $
#
#  $Log: Tangram.pm,v $
#  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::Abstract");

use Tangram;
use Data::Dumper;

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


our $metainfo = {
  'disconnectMethod' => 'disconnect',
};

sub getNewPerlObjectByPkgName {
  my $pkgname = shift;
  my $args = shift;
  $logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );
  my $evstring = "use $pkgname;";
  eval($evstring);
  $@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " .  $@ );
  return $pkgname->new($args);
}

sub _initSchema {
  my $self = shift;
  $logger->debug( __PACKAGE__ . "->_initSchema()" );
  #if (!$self->{schema_tangram}) {
    my $obj = getNewPerlObjectByPkgName($self->{schema}, { EXPORT_OBJECTS => $self->{classnames} } );
    $self->{schema_tangram} = $obj->getSchema();
  #}
  if (!$self->{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->{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();

    #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
    $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );
  
    #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
    #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
    #$self->_configureUnderlyingStorage;
    $self->configureCOREHANDLE();

  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} );
  my $storage = $self->_getSubLayerHandle();
  #$storage->_configureCOREHANDLE();

  #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
  if (my $result = $storage->sendCommand( 'SHOW TABLES;' ) ) {
    while ( my $row = $result->_getNextEntry() ) {
      push @nodes, $row;
    }
  }
  
  $storage->disconnect();
  
  $self->{meta}->{childnodes} = \@nodes;
  
  return \@nodes;

}


sub existsChildNode {
  my $self = shift;
  my $nodename = shift;
  $logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" );
  $self->getChildNodes() unless $self->{meta}->{childnodes};
  return grep $nodename, @{$self->{meta}->{childnodes}};
}


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;
  }

  return 1;

}


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

  use Data::Dumper;
  #print Dumper($self);
  #exit;
  
  # 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->{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 $dsn = $self->{locator}->{dbi}->{dsn};
  my $dsn = $self->{dbi}->{dsn};

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

  my $ok;
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      PrintError => 0,
                                                    } ) ) {

    return unless $self->_initSchema();
    
    $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );
    $dbh->disconnect();
  }
  return $ok;
}

sub retreatSchema {

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

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

  my $ok;
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      #PrintError => 0,
                                                      #RaiseError => 0,
                                                    } ) ) {

    return unless $self->_initSchema();
    
    #use Data::Dumper; print Dumper($self);
    $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
    
    $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );
    $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status
                    # idea: 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
    $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;
}

1;
1	cvsjoko	1.1	#################################
2			#
3	joko	1.4	# $Id: Tangram.pm,v 1.3 2002/10/17 03:56:55 joko Exp $
4	joko	1.2	#
5			# $Log: Tangram.pm,v $
6	joko	1.4	# Revision 1.3 2002/10/17 03:56:55 joko
7			# + bugfix: trapped eval error
8			#
9	joko	1.3	# Revision 1.2 2002/10/17 00:10:05 joko
10			# + removed dependency from tsobj.pm, schema is now independent
11			# + sub getNewPerlObjectByPkgName
12			# + sub deploySchema
13			# + sub retreatSchema
14			#
15	joko	1.2	# Revision 1.1 2002/10/10 03:44:07 cvsjoko
16			# + new
17	cvsjoko	1.1	#
18			#
19			#################################
20
21			package Data::Storage::Handler::Tangram;
22
23			use strict;
24			use warnings;
25
26			use base ("Data::Storage::Handler::Abstract");
27
28			use Tangram;
29			use Data::Dumper;
30
31			# get logger instance
32			my $logger = Log::Dispatch::Config->instance;
33
34
35			our $metainfo = {
36			'disconnectMethod' => 'disconnect',
37			};
38
39	joko	1.2	sub getNewPerlObjectByPkgName {
40			my $pkgname = shift;
41			my $args = shift;
42	joko	1.3	$logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );
43	joko	1.2	my $evstring = "use $pkgname;";
44			eval($evstring);
45	joko	1.3	$@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " . $@ );
46	joko	1.2	return $pkgname->new($args);
47			}
48
49	joko	1.4	sub _initSchema {
50			my $self = shift;
51			$logger->debug( __PACKAGE__ . "->_initSchema()" );
52			#if (!$self->{schema_tangram}) {
53			my $obj = getNewPerlObjectByPkgName($self->{schema}, { EXPORT_OBJECTS => $self->{classnames} } );
54			$self->{schema_tangram} = $obj->getSchema();
55			#}
56			if (!$self->{schema_tangram}) {
57			$logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
58			return 0;
59			}
60			return 1;
61			}
62
63	cvsjoko	1.1	sub connect {
64
65			my $self = shift;
66
67			my $dsn = shift;
68			$dsn \|\|= $self->{dbi}->{dsn};
69
70	joko	1.2	$logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
71	cvsjoko	1.1
72			#my $storage = Tangram::Relational->connect( $schema, $dsn );
73			#my $storage = Tangram::mysql->connect( $schema, $dsn );
74			#$storage = Tangram::Relational->connect( Project->schema, $dsn );
75
76			# if (!testDsn($dsn)) {
77			# croak("Database at \"$dsn\" is not available");
78			# return;
79			# }
80
81	joko	1.4	return unless $self->_initSchema();
82
83	joko	1.2	#$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
84			$self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );
85	cvsjoko	1.1
86			#$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
87			#$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
88			#$self->_configureUnderlyingStorage;
89			$self->configureCOREHANDLE();
90
91	joko	1.4	return 1;
92
93	cvsjoko	1.1	}
94
95			sub getChildNodes {
96
97			my $self = shift;
98			my @nodes;
99
100	joko	1.4	$logger->debug( __PACKAGE__ . "->getChildNodes()" );
101
102	cvsjoko	1.1	# create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
103			#my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
104			#my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
105			my $storage = $self->_getSubLayerHandle();
106			#$storage->_configureCOREHANDLE();
107
108			#if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
109			if (my $result = $storage->sendCommand( 'SHOW TABLES;' ) ) {
110			while ( my $row = $result->_getNextEntry() ) {
111			push @nodes, $row;
112			}
113			}
114
115			$storage->disconnect();
116
117	joko	1.4	$self->{meta}->{childnodes} = \@nodes;
118
119	cvsjoko	1.1	return \@nodes;
120
121			}
122
123
124	joko	1.4	sub existsChildNode {
125			my $self = shift;
126			my $nodename = shift;
127			$logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" );
128			$self->getChildNodes() unless $self->{meta}->{childnodes};
129			return grep $nodename, @{$self->{meta}->{childnodes}};
130			}
131
132
133			sub testIntegrity {
134
135			my $self = shift;
136
137			$logger->debug( __PACKAGE__ . "->testIntegrity()" );
138
139			# 1st test: are there tables?
140			if (!$self->getChildNodes()) {
141			$logger->warning( __PACKAGE__ . "->testIntegrity no childnodes exist" );
142			return;
143			}
144
145			# 2nd test: is there a table named "Tangram"?
146			if (!$self->existsChildNode("Tangram")) {
147			$logger->warning( __PACKAGE__ . "->testIntegrity childnode \"Tangram\" doesn't exist" );
148			return;
149			}
150
151			return 1;
152
153			}
154
155
156	cvsjoko	1.1	sub _getSubLayerHandle {
157
158			my $self = shift;
159
160	joko	1.4	$logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
161
162	cvsjoko	1.1	use Data::Dumper;
163			#print Dumper($self);
164	joko	1.4	#exit;
165	cvsjoko	1.1
166			# hack, make more generic!
167	joko	1.4	if (!$self->{dataStorageLayer}) {
168			$logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
169			#my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
170			my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi} );
171			$self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
172	cvsjoko	1.1	#$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
173			#$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
174			}
175
176			#print Dumper($self->{STORAGE_UNDER_THE_HOOD});
177
178	joko	1.4	return $self->{dataStorageLayer};
179	cvsjoko	1.1
180			}
181
182			sub _configureUnderlyingStorage {
183
184			my $self = shift;
185	joko	1.4
186			$logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );
187
188	cvsjoko	1.1	$self->_configureCOREHANDLE_DBI();
189			return;
190
191			foreach my $key (keys %{$self->{dbi}}) {
192			my $val = $self->{dbi}->{$key};
193			print "entry: $key; $val", "\n";
194			$self->{COREHANDLE}->{db}->{$key} = $val;
195			}
196			#print Dumper($self->{COREHANDLE}->{db});
197			}
198
199
200			sub configureCOREHANDLE {
201
202			my $self = shift;
203
204	joko	1.4	$logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
205	cvsjoko	1.1
206			#my $subLayer = $self->_getSubLayerHandle();
207
208			# apply configured modifications
209			if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
210			$self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
211			}
212			if (exists $self->{dbi}->{RaiseError}) {
213			$self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
214			}
215			if (exists $self->{dbi}->{PrintError}) {
216			$self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
217			}
218			if (exists $self->{dbi}->{HandleError}) {
219			$self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
220			}
221
222	joko	1.2	}
223
224			sub deploySchema {
225			my $self = shift;
226			#my $dsn = $self->{locator}->{dbi}->{dsn};
227			my $dsn = $self->{dbi}->{dsn};
228	joko	1.4
229			$logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
230
231	joko	1.2	my $ok;
232			if ( my $dbh = DBI->connect($dsn, '', '', {
233			PrintError => 0,
234			} ) ) {
235	joko	1.4
236			return unless $self->_initSchema();
237
238			$ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );
239	joko	1.2	$dbh->disconnect();
240			}
241			return $ok;
242			}
243
244			sub retreatSchema {
245	joko	1.4
246	joko	1.2	my $self = shift;
247			#my $dsn = $self->{locator}->{dbi}->{dsn};
248			my $dsn = $self->{dbi}->{dsn};
249	joko	1.4
250			$logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
251
252	joko	1.2	my $ok;
253			if ( my $dbh = DBI->connect($dsn, '', '', {
254	joko	1.4	#PrintError => 0,
255			#RaiseError => 0,
256	joko	1.2	} ) ) {
257	joko	1.4
258			return unless $self->_initSchema();
259
260			#use Data::Dumper; print Dumper($self);
261			$self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
262
263			$ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );
264			$ok = 2; # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status
265			# idea: test this by checking for count of tables in database -
266			# problem with this: there may be some left not having been included to the schema
267	joko	1.2	$dbh->disconnect();
268			}
269			return $ok;
270	joko	1.4	}
271
272			sub rebuildDbAndSchema {
273			my $self = shift;
274			$logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );
275			my @results;
276
277			# sum up results (bool (0/1)) in array
278			push @results, $self->retreatSchema();
279			push @results, $self->{dataStorageLayer}->dropDb();
280			push @results, $self->{dataStorageLayer}->createDb();
281			push @results, $self->deploySchema();
282
283			# scan array for "bad ones"
284			my $res = 1;
285			map {
286			$res = 0 if (!$_);
287			} @results;
288
289			return $res;
290	cvsjoko	1.1	}
291
292			1;
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