libs/Data/Storage.pm

#################################
#
#  $Id: Storage.pm,v 1.2 2002/10/17 00:04:29 joko Exp $
#
#  $Log: Storage.pm,v $
#  Revision 1.2  2002/10/17 00:04:29  joko
#  + sub createDb
#  + sub isConnected
#  + bugfixes regarding "deep recursion" stuff
#
#  Revision 1.1  2002/10/10 03:43:12  cvsjoko
#  + new
#
#
#################################

# aim_V1: should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary way ;)
# aim_V2: introduce a generic layered structure, refactor *SUBLAYER*-stuff, make (e.g.) this possible:
#               - Perl Data::Storage[DBD::CSV]  ->  Perl LWP::  ->  Internet HTTP/FTP/*  ->  Host Daemon  ->  csv-file

package Data::Storage;

use strict;
use warnings;

use Data::Storage::Locator;

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

sub new {
  my $invocant = shift;
  my $class = ref($invocant) || $invocant;
  #my @args = normalizeArgs(@_);
  
  my $arg_locator = shift;
  my $arg_options = shift;
  
  #my $self = { STORAGEHANDLE => undef, @_ };
  my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };
  $logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );
  return bless $self, $class;
}

sub AUTOLOAD {
  
  # since this is a core function acting as dispatcher to $self->{STORAGEHANDLE},
  # some sophisticated handling and filtering is needed to avoid things like
  #     - Deep recursion on subroutine "Data::Storage::AUTOLOAD"
  #     - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD"
  #     - Deep recursion on anonymous subroutine at [...]
  # we also might filter log messages caused by logging itself in "advanced logging of AUTOLOAD calls"
  
  my $self = shift;
  our $AUTOLOAD;
  
  # ->DESTROY would - if not declared - trigger an AUTOLOAD also
  return if $AUTOLOAD =~ m/::DESTROY$/;

  my $method = $AUTOLOAD;
  $method =~ s/^.*:://;

  # advanced logging of AUTOLOAD calls
    my $logstring = "";
    $logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method;
    #print "count: ", $#_, "\n";
    #$logstring .= Dumper(@_) if ($#_ != -1);
    my $tabcount = int( (80 - length($logstring)) / 10 );
    $logstring .= "\t" x $tabcount . "(AUTOLOAD)";
    # TODO: only ok if logstring doesn't contain 
    #            e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c))          (AUTOLOAD)"
    # but that would be way too specific as long as we don't have an abstract handler for this  ;)
    $logger->debug( $logstring );

  # filtering AUTOLOAD calls
  if ($self->_filter_AUTOLOAD($method)) {
    $self->_accessStorage();
    $self->{STORAGEHANDLE}->$method(@_);
  }
  
}

sub _filter_AUTOLOAD {
  my $self = shift;
  my $method = shift;
  if ($self->{options}->{protected}) {
    if ($method eq 'disconnect') {
      return;
    }
  }
  return 1;
}


sub normalizeArgs {
  my %args = @_;
  if (!$args{dsn} && $args{meta}{dsn}) {
    $args{dsn} = $args{meta}{dsn};
  }
  my @result = %args;
  return @result;
}

sub _accessStorage {
  my $self = shift;
  # TODO: to some tracelevel!
  $logger->debug( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->_accessStorage()" );
  if (!$self->{STORAGEHANDLE}) {
    $self->_createStorageHandle();
  }
}

sub _createStorageHandle {
  my $self = shift;

  my $type = $self->{locator}->{type};
  $logger->debug( __PACKAGE__ .  "[$type]" . "->_createStorageHandle()" );

  my $pkg = "Data::Storage::Handler::" . $type . "";
  
  # propagate args to handler
  # needs some more thoughts! (not only "dbi" to Tangram, when (in future) db is not more the common case)
  if ($type eq 'DBI') {
    use Data::Storage::Handler::DBI;
    #my @args = %{$self->{locator}->{dbi}};
    my @args = %{$self->{locator}};
    # create new storage handle
    $self->{STORAGEHANDLE} = $pkg->new( @args );
  }
  if ($type eq 'Tangram') {
    use Data::Storage::Handler::Tangram;
    #$self->{STORAGEHANDLE} = $pkg->new( dsn => $self->{locator}->{dbi}->{dsn} );
    #my @args = %{$self->{locator}->{dbi}};
    my @args = %{$self->{locator}};
    # create new storage handle
    $self->{STORAGEHANDLE} = $pkg->new( @args );

    #$self->{STORAGEHANDLE_UNDERLYING} = $self->{STORAGEHANDLE}->getUnderlyingStorage();
    #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
  }
  
}

sub addLogDispatchHandler {

      my $self = shift;
      my $name = shift;
      my $package = shift;
      my $logger1 = shift;
      my $objectCreator = shift;
      
      #$logger->add( Log::Dispatch::Tangram->new( name => $name,
      $logger->add( $package->new( name => $name,
                                            #min_level => 'debug',
                                            min_level => 'info',
                                            storage => $self,
                                            objectCreator => $objectCreator,
                                            fields => {
                                              message => 'usermsg',
                                              timestamp => 'stamp',
                                              level => 'level',
                                              name => 'code',
                                            },
                                            filter_patterns => [ '->insert\(SystemEvent=' ],
                                            #filter_patterns => [ 'SystemEvent' ],
                                            
                                            #format  => '[%d] [%p] %m%n',
                                             ) );

}

sub removeLogDispatchHandler {

      my $self = shift;
      my $name = shift;
      #my $logger = shift;

      $logger->remove($name);

}

sub getDbName {
  my $self = shift;
  my $dsn = $self->{locator}->{dbi}->{dsn};
  $dsn =~ m/database=(.+?);/;
  my $database_name = $1;
  return $database_name;
}

sub testDsn {
  my $self = shift;
  my $dsn = $self->{locator}->{dbi}->{dsn};
  my $result;
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      PrintError => 0,
                                                      } ) ) {
    $dbh->disconnect();
    return 1;
  } else {
    $logger->error( __PACKAGE__ .  "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr );
  }
}

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

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

  $dsn =~ s/database=(.+?);//;
  my $database_name = $1;

  my $ok;
  
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      PrintError => 0,
                                                      } ) ) {
    if ($database_name) {
      if ($dbh->do("CREATE DATABASE $database_name;")) {
        $ok = 1;
      }
    }
    $dbh->disconnect();
  }
  
  return $ok;
  
}

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

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

  $dsn =~ s/database=(.+?);//;
  my $database_name = $1;

  my $ok;
  
  if ( my $dbh = DBI->connect($dsn, '', '', {
                                                      PrintError => 0,
                                                      } ) ) {
    if ($database_name) {
      if ($dbh->do("DROP DATABASE $database_name;")) {
        $ok = 1;
      }
    }
    $dbh->disconnect();
  }
  
  return $ok;
}

sub isConnected {
  my $self = shift;
  return 1 if $self->{STORAGEHANDLE};
}

1;
1	#################################
2	#
3	# $Id: Storage.pm,v 1.2 2002/10/17 00:04:29 joko Exp $
4	#
5	# $Log: Storage.pm,v $
6	# Revision 1.2 2002/10/17 00:04:29 joko
7	# + sub createDb
8	# + sub isConnected
9	# + bugfixes regarding "deep recursion" stuff
10	#
11	# Revision 1.1 2002/10/10 03:43:12 cvsjoko
12	# + new
13	#
14	#
15	#################################
16
17	# aim_V1: should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary way ;)
18	# aim_V2: introduce a generic layered structure, refactor SUBLAYER-stuff, make (e.g.) this possible:
19	# - Perl Data::Storage[DBD::CSV] -> Perl LWP:: -> Internet HTTP/FTP/* -> Host Daemon -> csv-file
20
21	package Data::Storage;
22
23	use strict;
24	use warnings;
25
26	use Data::Storage::Locator;
27
28	# get logger instance
29	my $logger = Log::Dispatch::Config->instance;
30
31	sub new {
32	my $invocant = shift;
33	my $class = ref($invocant) \|\| $invocant;
34	#my @args = normalizeArgs(@_);
35
36	my $arg_locator = shift;
37	my $arg_options = shift;
38
39	#my $self = { STORAGEHANDLE => undef, @_ };
40	my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options };
41	$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" );
42	return bless $self, $class;
43	}
44
45	sub AUTOLOAD {
46
47	# since this is a core function acting as dispatcher to $self->{STORAGEHANDLE},
48	# some sophisticated handling and filtering is needed to avoid things like
49	# - Deep recursion on subroutine "Data::Storage::AUTOLOAD"
50	# - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD"
51	# - Deep recursion on anonymous subroutine at [...]
52	# we also might filter log messages caused by logging itself in "advanced logging of AUTOLOAD calls"
53
54	my $self = shift;
55	our $AUTOLOAD;
56
57	# ->DESTROY would - if not declared - trigger an AUTOLOAD also
58	return if $AUTOLOAD =~ m/::DESTROY$/;
59
60	my $method = $AUTOLOAD;
61	$method =~ s/^.*:://;
62
63	# advanced logging of AUTOLOAD calls
64	my $logstring = "";
65	$logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method;
66	#print "count: ", $#_, "\n";
67	#$logstring .= Dumper(@_) if ($#_ != -1);
68	my $tabcount = int( (80 - length($logstring)) / 10 );
69	$logstring .= "\t" x $tabcount . "(AUTOLOAD)";
70	# TODO: only ok if logstring doesn't contain
71	# e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c)) (AUTOLOAD)"
72	# but that would be way too specific as long as we don't have an abstract handler for this ;)
73	$logger->debug( $logstring );
74
75	# filtering AUTOLOAD calls
76	if ($self->_filter_AUTOLOAD($method)) {
77	$self->_accessStorage();
78	$self->{STORAGEHANDLE}->$method(@_);
79	}
80
81	}
82
83	sub _filter_AUTOLOAD {
84	my $self = shift;
85	my $method = shift;
86	if ($self->{options}->{protected}) {
87	if ($method eq 'disconnect') {
88	return;
89	}
90	}
91	return 1;
92	}
93
94
95	sub normalizeArgs {
96	my %args = @_;
97	if (!$args{dsn} && $args{meta}{dsn}) {
98	$args{dsn} = $args{meta}{dsn};
99	}
100	my @result = %args;
101	return @result;
102	}
103
104	sub _accessStorage {
105	my $self = shift;
106	# TODO: to some tracelevel!
107	$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->_accessStorage()" );
108	if (!$self->{STORAGEHANDLE}) {
109	$self->_createStorageHandle();
110	}
111	}
112
113	sub _createStorageHandle {
114	my $self = shift;
115
116	my $type = $self->{locator}->{type};
117	$logger->debug( __PACKAGE__ . "[$type]" . "->_createStorageHandle()" );
118
119	my $pkg = "Data::Storage::Handler::" . $type . "";
120
121	# propagate args to handler
122	# needs some more thoughts! (not only "dbi" to Tangram, when (in future) db is not more the common case)
123	if ($type eq 'DBI') {
124	use Data::Storage::Handler::DBI;
125	#my @args = %{$self->{locator}->{dbi}};
126	my @args = %{$self->{locator}};
127	# create new storage handle
128	$self->{STORAGEHANDLE} = $pkg->new( @args );
129	}
130	if ($type eq 'Tangram') {
131	use Data::Storage::Handler::Tangram;
132	#$self->{STORAGEHANDLE} = $pkg->new( dsn => $self->{locator}->{dbi}->{dsn} );
133	#my @args = %{$self->{locator}->{dbi}};
134	my @args = %{$self->{locator}};
135	# create new storage handle
136	$self->{STORAGEHANDLE} = $pkg->new( @args );
137
138	#$self->{STORAGEHANDLE_UNDERLYING} = $self->{STORAGEHANDLE}->getUnderlyingStorage();
139	#$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
140	}
141
142	}
143
144	sub addLogDispatchHandler {
145
146	my $self = shift;
147	my $name = shift;
148	my $package = shift;
149	my $logger1 = shift;
150	my $objectCreator = shift;
151
152	#$logger->add( Log::Dispatch::Tangram->new( name => $name,
153	$logger->add( $package->new( name => $name,
154	#min_level => 'debug',
155	min_level => 'info',
156	storage => $self,
157	objectCreator => $objectCreator,
158	fields => {
159	message => 'usermsg',
160	timestamp => 'stamp',
161	level => 'level',
162	name => 'code',
163	},
164	filter_patterns => [ '->insert\(SystemEvent=' ],
165	#filter_patterns => [ 'SystemEvent' ],
166
167	#format => '[%d] [%p] %m%n',
168	) );
169
170	}
171
172	sub removeLogDispatchHandler {
173
174	my $self = shift;
175	my $name = shift;
176	#my $logger = shift;
177
178	$logger->remove($name);
179
180	}
181
182	sub getDbName {
183	my $self = shift;
184	my $dsn = $self->{locator}->{dbi}->{dsn};
185	$dsn =~ m/database=(.+?);/;
186	my $database_name = $1;
187	return $database_name;
188	}
189
190	sub testDsn {
191	my $self = shift;
192	my $dsn = $self->{locator}->{dbi}->{dsn};
193	my $result;
194	if ( my $dbh = DBI->connect($dsn, '', '', {
195	PrintError => 0,
196	} ) ) {
197	$dbh->disconnect();
198	return 1;
199	} else {
200	$logger->error( __PACKAGE__ . "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr );
201	}
202	}
203
204	sub createDb {
205	my $self = shift;
206	my $dsn = $self->{locator}->{dbi}->{dsn};
207
208	$logger->debug( __PACKAGE__ . "->createDb( dsn $dsn )" );
209
210	$dsn =~ s/database=(.+?);//;
211	my $database_name = $1;
212
213	my $ok;
214
215	if ( my $dbh = DBI->connect($dsn, '', '', {
216	PrintError => 0,
217	} ) ) {
218	if ($database_name) {
219	if ($dbh->do("CREATE DATABASE $database_name;")) {
220	$ok = 1;
221	}
222	}
223	$dbh->disconnect();
224	}
225
226	return $ok;
227
228	}
229
230	sub dropDb {
231	my $self = shift;
232	my $dsn = $self->{locator}->{dbi}->{dsn};
233
234	$logger->debug( __PACKAGE__ . "->dropDb( dsn $dsn )" );
235
236	$dsn =~ s/database=(.+?);//;
237	my $database_name = $1;
238
239	my $ok;
240
241	if ( my $dbh = DBI->connect($dsn, '', '', {
242	PrintError => 0,
243	} ) ) {
244	if ($database_name) {
245	if ($dbh->do("DROP DATABASE $database_name;")) {
246	$ok = 1;
247	}
248	}
249	$dbh->disconnect();
250	}
251
252	return $ok;
253	}
254
255	sub isConnected {
256	my $self = shift;
257	return 1 if $self->{STORAGEHANDLE};
258	}
259
260	1;
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