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	#################################
2	#
3	# $Id: Tangram.pm,v 1.3 2002/10/17 03:56:55 joko Exp $
4	#
5	# $Log: Tangram.pm,v $
6	# Revision 1.3 2002/10/17 03:56:55 joko
7	# + bugfix: trapped eval error
8	#
9	# 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	# Revision 1.1 2002/10/10 03:44:07 cvsjoko
16	# + new
17	#
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	sub getNewPerlObjectByPkgName {
40	my $pkgname = shift;
41	my $args = shift;
42	$logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );
43	my $evstring = "use $pkgname;";
44	eval($evstring);
45	$@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " . $@ );
46	return $pkgname->new($args);
47	}
48
49	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	sub connect {
64
65	my $self = shift;
66
67	my $dsn = shift;
68	$dsn \|\|= $self->{dbi}->{dsn};
69
70	$logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
71
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	return unless $self->_initSchema();
82
83	#$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
84	$self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );
85
86	#$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
87	#$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
88	#$self->_configureUnderlyingStorage;
89	$self->configureCOREHANDLE();
90
91	return 1;
92
93	}
94
95	sub getChildNodes {
96
97	my $self = shift;
98	my @nodes;
99
100	$logger->debug( __PACKAGE__ . "->getChildNodes()" );
101
102	# 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	$self->{meta}->{childnodes} = \@nodes;
118
119	return \@nodes;
120
121	}
122
123
124	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	sub _getSubLayerHandle {
157
158	my $self = shift;
159
160	$logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
161
162	use Data::Dumper;
163	#print Dumper($self);
164	#exit;
165
166	# hack, make more generic!
167	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( $loc, { protected => 1 } );
172	#$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	return $self->{dataStorageLayer};
179
180	}
181
182	sub _configureUnderlyingStorage {
183
184	my $self = shift;
185
186	$logger->debug( __PACKAGE__ . "->_configureUnderlyingStorage" );
187
188	$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	$logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
205
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	}
223
224	sub deploySchema {
225	my $self = shift;
226	#my $dsn = $self->{locator}->{dbi}->{dsn};
227	my $dsn = $self->{dbi}->{dsn};
228
229	$logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
230
231	my $ok;
232	if ( my $dbh = DBI->connect($dsn, '', '', {
233	PrintError => 0,
234	} ) ) {
235
236	return unless $self->_initSchema();
237
238	$ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );
239	$dbh->disconnect();
240	}
241	return $ok;
242	}
243
244	sub retreatSchema {
245
246	my $self = shift;
247	#my $dsn = $self->{locator}->{dbi}->{dsn};
248	my $dsn = $self->{dbi}->{dsn};
249
250	$logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
251
252	my $ok;
253	if ( my $dbh = DBI->connect($dsn, '', '', {
254	#PrintError => 0,
255	#RaiseError => 0,
256	} ) ) {
257
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	$dbh->disconnect();
268	}
269	return $ok;
270	}
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	}
291
292	1;
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