Storage/Handler/Abstract.pm

##    ------------------------------------------------------------------------
##    $Id: Abstract.pm,v 1.11 2003/01/20 16:43:18 joko Exp $
##    ------------------------------------------------------------------------
##    $Log: Abstract.pm,v $
##    Revision 1.11  2003/01/20 16:43:18  joko
##    + better argument-property merging
##    + debugging-output !!!
##    + abstract-dummy 'sub createChildNode'
##
##    Revision 1.10  2003/01/19 02:31:51  joko
##    + fix to 'sub AUTOLOAD'
##
##    Revision 1.9  2002/12/19 16:30:23  joko
##    + added 'sub dropDb' and 'sub rebuildDb' as croakers for concrete implementations of methods in proper handlers
##
##    Revision 1.8  2002/12/13 21:48:35  joko
##    + sub _abstract_function
##
##    Revision 1.7  2002/12/05 07:57:48  joko
##    + now using Tie::SecureHash as a base for the COREHANDLE
##    + former public COREHANDLE becomes private _COREHANDLE now
##
##    Revision 1.6  2002/12/03 15:52:24  joko
##    + fix/feature: if dispatching to deep core method fails (is not declared), try method at Data::Storage - level
##
##    Revision 1.5  2002/12/01 22:19:33  joko
##    + just disconnect if COREHANDLE exists
##
##    Revision 1.4  2002/12/01 04:45:38  joko
##    + sub eraseAll
##    + sub createDb
##
##    Revision 1.3  2002/11/29 04:58:20  joko
##    + Storage::Result now uses the same dispatching mechanism like Storage::Handler
##
##    Revision 1.2  2002/10/17 00:08:07  joko
##    + bugfixes regarding "deep recursion" stuff
##
##    Revision 1.1  2002/10/10 03:44:07  cvsjoko
##    + new
##    ------------------------------------------------------------------------


package Data::Storage::Handler::Abstract;

use strict;
use warnings;

use base qw( DesignPattern::Object );


use Data::Dumper;
use Tie::SecureHash;
#use Data::Storage::Handler;
use Data::Transform::Deep qw( merge );


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

#our $lock_info;

sub new {
  my $invocant = shift;
  my $class = ref($invocant) || $invocant;
  
  # logging info about the actual handler called
    $logger->debug( "$invocant->new( @_ )" );
    #$logger->debug( __PACKAGE__ . "->" . "new()" );

  # V1 - arguments become properties automagically / normal perl mode blessing
=pod
  # autovivify passed-in arguments as future object attributes into to-be-blessed hash
  my $self = { @_ };
  # create object from blessed hash-reference
  bless $self, $class;
=cut

#=pod
  # V2 - maybe more convenient/secure? utilizing Damian Conway's Tie::SecureHash...
  my $self = Tie::SecureHash->new(
    $class,
    # that's it:
      'metainfo' => undef,
      'lock_info' => undef,
      '_COREHANDLE' => undef,
      'meta' => undef,
      'locator' => undef,
      'dataStorageLayer' => undef,
      'dbi' => undef,
    # tries:
      #'Data::Storage::Handler::Abstract::metainfo' => undef,
      #'dataStorageLayer'
      #'Data::Storage::Handler::Abstract::dataStorageLayer' => undef,
      #'Data::Storage::Handler::Tangram::dataStorageLayer' => undef,
      #'Data::Dumper::locator' => undef,
      #$class . '::locator' => undef,
      #'Data::Storage::Handler::Tangram::locator' => undef,
      #'Data::Storage::Handler::DBI::locator' => undef,
      #_protected => ,
      #__private => ,
  );
#=cut

  # merge passed-in arguments to constructor as properties into already blessed secure object

    # mungle arguments from array into hash - perl does the job  ;)
    #my %args = @_;
    #my %args = ();

#print Dumper(@_);

    # merge attributes one-by-one
    # TODO: deep_copy? / merge_deep?
    while (my $elemName = shift @_) {
      #print "elemName: $elemName", "\n";
      if (my $elemValue = shift @_) {
        #print Dumper($elemValue);
        #print "elemName=$elemName, elemValue=$elemValue", "\n";
        $self->{$elemName} = $elemValue;
      }
      #$self->{$_} = $args{$_};
      #$self->{$_} = $args{$_};
    }
  
  # V3 - rolling our own security (just for {COREHANDLE} - nothing else)  -  nope, Tie::SecureHash works wonderful
  #my $self = { @_ };
  #bless $self, $class;
  
  
  # handle meta data
    #my $metainfo = $self->getMetaInfo($class);
    my $metainfo = $self->getMetaInfo();
    if (!$metainfo->{disconnectMethod}) { $metainfo->{disconnectMethod} = 'disconnect'; }
    # type?
    $invocant =~ s/Data::Storage::Handler:://;
    $metainfo->{type} = $invocant;

    # direct accessible (non-protected) properties         ( was: my $self = { }; )
    $self->{metainfo} = $metainfo;

  return $self;
}


# TODO: use NEXT.pm inside this mechanism (to avoid repetitions...)
sub AUTOLOAD {

  # recursion problem to be avoided here!!!
  
    # - problem: we get recursion-hangs!!!   =>  perl stops with ...
    # "Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD" at [...]/libs/Data/Storage.pm line 38."
    
    # - when: if we log to ourselves as a storage-implementation (e.g. via Log::Dispatch::Tangram)
    # - why:  debug-messages are on a very low level including every data-operation to "Data::Storage(::Handler::X)",
    #             so e.g. a "$storage->insert" would trigger another "$storage->insert" itself 
    #             which leads to a infinite recursion loop (deep recursion)
    # - solution: locks! (by Hack or (maybe) via Perl "local"s)

  my $self = shift;

  our $AUTOLOAD;
  #return if $AUTOLOAD =~ m/::DESTROY$/;

  # find out methodname
  my $methodname = $AUTOLOAD;
  $methodname =~ s/^.*:://;
  
#print "method: $methodname", "\n";
  
  # TODO: document this! handler-private methods listed here will not be triggered (internal use)
  # in this case, "exists" is a method reserved for Tie::SecureHash,
  # which encapsulates the perl data structure (HASH) under this object
  # this is to prevent deep recursion's
  return if lc $methodname eq 'exists';

#print "$methodname - 1", "\n";

  # TODO: enhance logging/debugging
  #if (!$self->exists('COREHANDLE')) { return; }

  # handle locking (hack)
  if ($self->can('exists') && $self->exists('lock_info') && $self->{lock_info}->{last_method} && $methodname eq $self->{lock_info}->{last_method}) {
    $self->{lock_info}->{log_lock} = 1;
  } else {
    $self->{lock_info}->{log_lock} = 0;
  }
  $self->{lock_info}->{last_method} = $methodname;
  
#print "$methodname - 2", "\n";

#print Dumper($self);
#exit;

  # get corehandle instance from underlying handler
  my $core = $self->getCOREHANDLE();

  # test for COREHANDLE
  #if (!$self->{_COREHANDLE}) {
#=pod
  #if (!$self->exists('_COREHANDLE')) {
  #if (!$self->{_COREHANDLE}) {
  if (!$core) {

#print Dumper($self);    
#exit;

    my $handlertype = $self->{metainfo}->{type};
    $handlertype ||= '';

    my $err_msg_core = __PACKAGE__ . "[$handlertype]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"";

#print $err_msg_core, "\n";

    #if ($self->exists('lock_info') && !$self->{lock_info}->{log_lock}) {
      $logger->error( $err_msg_core );
    #}

    return;
    
  }
#=cut

#print "$methodname - 3", "\n";

  # try to dispatch method-call to Storage::Handler::*
  #if ($self->can($methodname)) {
    #$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" );
    #my $res = $self->$methodname(@_);
    #if ($res) { return $res; }
  #}

#print "$methodname - 4", "\n";

  # try to dispatch method-call to COREHANDLE
  # was:
  #my $core = $self->{_COREHANDLE};
  # is:
  #my $core = $self->getCOREHANDLE();

#print Dumper($core);
#exit;

  # was:
  #if ($self->{_COREHANDLE}->can($methodname) || $self->{_COREHANDLE}->can("AUTOLOAD")) {
  # is:
  if ($core->can($methodname) || $core->can("AUTOLOAD")) {
    #$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
    #$lock_AUTOLOAD = 1 if ($methodname eq 'insert');
    if (!$self->{lock_info}->{log_lock}) {
      #print "method: $methodname", "\n";
      $logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" );
    } else {
      # AUTOLOAD - sub is locked to prevent deep recursions if (e.g.) db-inserts cause log-actions to same db itself
    }
    #$lock_AUTOLOAD = 0;
    #$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
    
#print "calling: $methodname", "\n";
    
    # method calls making it until here will get dispatched to the proper handler
    return $core->$methodname(@_);
  
  } elsif ($self->can($methodname)) {
    # try to call specified method inside our or inherited module(s) scope(s)
    return $self->$methodname(@_);
  }

}

sub DESTROY {
  my $self = shift;
  #if ($self->{COREHANDLE}) {
  if ($self->exists('_COREHANDLE')) {
    $logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );

    my $disconnectMethod = $self->{metainfo}->{disconnectMethod};

    # call "disconnect" or alike on COREHANDLE
    # was: $self->{COREHANDLE}->disconnect();
    $disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() );

    undef $self->{_COREHANDLE};
  }
}

sub _typeCheck2 {
  my $type = shift;
  print "type: $type";
  eval("use Data::Storage::$type;");
}


# ====================================================
#   PUBLIC METHODS
# ====================================================

  sub existsChildNode {
    my $self = shift;
    my $nodename = shift;
    #$nodename = 'TransactionRoutingTable';
    $logger->debug( __PACKAGE__ . "->existsChildNode( nodename $nodename )" );
    $self->getChildNodes() unless $self->{meta}->{childnodes};
    my $result = grep(m/$nodename/i, @{$self->{meta}->{childnodes}});     # TODO: use "/i" only on win32-systems!
    return $result;
  }

  sub connect_tmp {
    
#    my $self = shift;
#    my $connectionString = shift;
#    # todo: patch connectionString to $args
#    _typeCheck($self->{args}{type});

  }
  

# ====================================================
#   CONCRETE METHOD DUMMIES (croaking via "$logger" by calling "_abstract_function")
# ====================================================

  # TODO:
  #   - abstract "abstract methods" to list/hash to be used in AUTOLOAD
  #      e.g.: my @ABSTRACT_METHODS = (qw( connect sendCommand getChildNodes ));
  #      use Class::XYZ (Construct)
  #   - build them via anonymous subs 
  #   - introduce them via symbols

  sub getCOREHANDLE {
    my $self = shift;
    $self->_abstract_function('getCOREHANDLE');
  }

  sub sendCommand {
    my $self = shift;
    $self->_abstract_function('sendCommand');
  }

  sub createChildNode {
    my $self = shift;
    $self->_abstract_function('createChildNode');
  }

  sub existsChildNode_tmp {
    my $self = shift;
    $self->_abstract_function('existsChildNode');
  }

  sub getChildNodes {
    my $self = shift;
    $self->_abstract_function('getChildNodes');
  }

  sub configureCOREHANDLE {
    my $self = shift;
    $self->_abstract_function('configureCOREHANDLE');
  }

  sub getMetaInfo {
    my $self = shift;
    $self->_abstract_function('getMetaInfo');
    return;
  }

  sub getListUnfiltered {
    my $self = shift;
    $self->_abstract_function('getListUnfiltered');
    return;
  }

  sub getListFiltered {
    my $self = shift;
    $self->_abstract_function('getListFiltered');
    return;
  }

  sub sendQuery {
    my $self = shift;
    $self->_abstract_function('sendQuery');
    return;
  }

  sub connect {
    my $self = shift;
    $self->_abstract_function('connect');
    return;
  }

  sub testIntegrity {
    my $self = shift;
    $self->_abstract_function('testIntegrity');
    return;
  }

  sub quoteSql {
    my $self = shift;
    $self->_abstract_function('quoteSql');
    return;
  }

  sub eraseAll {
    my $self = shift;
    $self->_abstract_function('eraseAll');
    return;
  }

  sub createDb {
    my $self = shift;
    $self->_abstract_function('createDb');
    return;
  }

  sub dropDb {
    my $self = shift;
    $self->_abstract_function('dropDb');
    return;
  }

  sub rebuildDb {
    my $self = shift;
    $self->_abstract_function('rebuildDb');
    return;
  }

1;
1	joko	1.11	## ------------------------------------------------------------------------
2	joko	1.12	## $Id: Abstract.pm,v 1.11 2003/01/20 16:43:18 joko Exp $
3	joko	1.11	## ------------------------------------------------------------------------
4	joko	1.7	## $Log: Abstract.pm,v $
5	joko	1.12	## Revision 1.11 2003/01/20 16:43:18 joko
6			## + better argument-property merging
7			## + debugging-output !!!
8			## + abstract-dummy 'sub createChildNode'
9			##
10	joko	1.11	## Revision 1.10 2003/01/19 02:31:51 joko
11			## + fix to 'sub AUTOLOAD'
12			##
13	joko	1.10	## Revision 1.9 2002/12/19 16:30:23 joko
14			## + added 'sub dropDb' and 'sub rebuildDb' as croakers for concrete implementations of methods in proper handlers
15			##
16	joko	1.9	## Revision 1.8 2002/12/13 21:48:35 joko
17			## + sub _abstract_function
18			##
19	joko	1.8	## Revision 1.7 2002/12/05 07:57:48 joko
20			## + now using Tie::SecureHash as a base for the COREHANDLE
21			## + former public COREHANDLE becomes private _COREHANDLE now
22			##
23	joko	1.7	## Revision 1.6 2002/12/03 15:52:24 joko
24			## + fix/feature: if dispatching to deep core method fails (is not declared), try method at Data::Storage - level
25			##
26			## Revision 1.5 2002/12/01 22:19:33 joko
27			## + just disconnect if COREHANDLE exists
28			##
29			## Revision 1.4 2002/12/01 04:45:38 joko
30			## + sub eraseAll
31			## + sub createDb
32			##
33			## Revision 1.3 2002/11/29 04:58:20 joko
34			## + Storage::Result now uses the same dispatching mechanism like Storage::Handler
35			##
36			## Revision 1.2 2002/10/17 00:08:07 joko
37			## + bugfixes regarding "deep recursion" stuff
38			##
39			## Revision 1.1 2002/10/10 03:44:07 cvsjoko
40			## + new
41	joko	1.11	## ------------------------------------------------------------------------
42	joko	1.7
43	cvsjoko	1.1
44			package Data::Storage::Handler::Abstract;
45
46			use strict;
47			use warnings;
48
49	joko	1.8	use base qw( DesignPattern::Object );
50
51	joko	1.11
52	cvsjoko	1.1	use Data::Dumper;
53	joko	1.7	use Tie::SecureHash;
54			#use Data::Storage::Handler;
55	joko	1.11	use Data::Transform::Deep qw( merge );
56
57	cvsjoko	1.1
58			# get logger instance
59			my $logger = Log::Dispatch::Config->instance;
60
61			#our $lock_info;
62
63			sub new {
64			my $invocant = shift;
65			my $class = ref($invocant) \|\| $invocant;
66
67			# logging info about the actual handler called
68			$logger->debug( "$invocant->new( @_ )" );
69	joko	1.2	#$logger->debug( __PACKAGE__ . "->" . "new()" );
70	cvsjoko	1.1
71	joko	1.7	# V1 - arguments become properties automagically / normal perl mode blessing
72			=pod
73			# autovivify passed-in arguments as future object attributes into to-be-blessed hash
74	joko	1.3	my $self = { @_ };
75			# create object from blessed hash-reference
76			bless $self, $class;
77	joko	1.7	=cut
78
79	joko	1.10	#=pod
80	joko	1.7	# V2 - maybe more convenient/secure? utilizing Damian Conway's Tie::SecureHash...
81			my $self = Tie::SecureHash->new(
82			$class,
83			# that's it:
84			'metainfo' => undef,
85			'lock_info' => undef,
86			'_COREHANDLE' => undef,
87			'meta' => undef,
88			'locator' => undef,
89			'dataStorageLayer' => undef,
90			'dbi' => undef,
91			# tries:
92			#'Data::Storage::Handler::Abstract::metainfo' => undef,
93			#'dataStorageLayer'
94			#'Data::Storage::Handler::Abstract::dataStorageLayer' => undef,
95			#'Data::Storage::Handler::Tangram::dataStorageLayer' => undef,
96			#'Data::Dumper::locator' => undef,
97			#$class . '::locator' => undef,
98			#'Data::Storage::Handler::Tangram::locator' => undef,
99			#'Data::Storage::Handler::DBI::locator' => undef,
100			#_protected => ,
101			#__private => ,
102			);
103	joko	1.10	#=cut
104	joko	1.7
105			# merge passed-in arguments to constructor as properties into already blessed secure object
106	joko	1.11
107	joko	1.7	# mungle arguments from array into hash - perl does the job ;)
108	joko	1.11	#my %args = @_;
109			#my %args = ();
110
111			#print Dumper(@_);
112
113	joko	1.7	# merge attributes one-by-one
114			# TODO: deep_copy? / merge_deep?
115	joko	1.11	while (my $elemName = shift @_) {
116			#print "elemName: $elemName", "\n";
117			if (my $elemValue = shift @_) {
118			#print Dumper($elemValue);
119			#print "elemName=$elemName, elemValue=$elemValue", "\n";
120			$self->{$elemName} = $elemValue;
121			}
122			#$self->{$_} = $args{$_};
123			#$self->{$_} = $args{$_};
124	joko	1.7	}
125
126			# V3 - rolling our own security (just for {COREHANDLE} - nothing else) - nope, Tie::SecureHash works wonderful
127			#my $self = { @_ };
128			#bless $self, $class;
129
130
131	joko	1.3
132	cvsjoko	1.1	# handle meta data
133	joko	1.3	#my $metainfo = $self->getMetaInfo($class);
134			my $metainfo = $self->getMetaInfo();
135	cvsjoko	1.1	if (!$metainfo->{disconnectMethod}) { $metainfo->{disconnectMethod} = 'disconnect'; }
136			# type?
137			$invocant =~ s/Data::Storage::Handler:://;
138			$metainfo->{type} = $invocant;
139
140			# direct accessible (non-protected) properties ( was: my $self = { }; )
141	joko	1.3	$self->{metainfo} = $metainfo;
142	cvsjoko	1.1
143			return $self;
144			}
145
146
147	joko	1.10	# TODO: use NEXT.pm inside this mechanism (to avoid repetitions...)
148	cvsjoko	1.1	sub AUTOLOAD {
149
150			# recursion problem to be avoided here!!!
151
152			# - problem: we get recursion-hangs!!! => perl stops with ...
153			# "Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD" at [...]/libs/Data/Storage.pm line 38."
154
155			# - when: if we log to ourselves as a storage-implementation (e.g. via Log::Dispatch::Tangram)
156			# - why: debug-messages are on a very low level including every data-operation to "Data::Storage(::Handler::X)",
157			# so e.g. a "$storage->insert" would trigger another "$storage->insert" itself
158			# which leads to a infinite recursion loop (deep recursion)
159	joko	1.2	# - solution: locks! (by Hack or (maybe) via Perl "local"s)
160	cvsjoko	1.1
161			my $self = shift;
162
163			our $AUTOLOAD;
164			#return if $AUTOLOAD =~ m/::DESTROY$/;
165
166			# find out methodname
167			my $methodname = $AUTOLOAD;
168			$methodname =~ s/^.*:://;
169	joko	1.7
170			#print "method: $methodname", "\n";
171
172			# TODO: document this! handler-private methods listed here will not be triggered (internal use)
173			# in this case, "exists" is a method reserved for Tie::SecureHash,
174			# which encapsulates the perl data structure (HASH) under this object
175			# this is to prevent deep recursion's
176			return if lc $methodname eq 'exists';
177
178	joko	1.12	#print "$methodname - 1", "\n";
179	joko	1.7
180			# TODO: enhance logging/debugging
181			#if (!$self->exists('COREHANDLE')) { return; }
182	cvsjoko	1.1
183			# handle locking (hack)
184	joko	1.10	if ($self->can('exists') && $self->exists('lock_info') && $self->{lock_info}->{last_method} && $methodname eq $self->{lock_info}->{last_method}) {
185	cvsjoko	1.1	$self->{lock_info}->{log_lock} = 1;
186			} else {
187			$self->{lock_info}->{log_lock} = 0;
188			}
189			$self->{lock_info}->{last_method} = $methodname;
190
191	joko	1.12	#print "$methodname - 2", "\n";
192	joko	1.7
193			#print Dumper($self);
194			#exit;
195
196			# get corehandle instance from underlying handler
197			my $core = $self->getCOREHANDLE();
198
199	cvsjoko	1.1	# test for COREHANDLE
200	joko	1.7	#if (!$self->{_COREHANDLE}) {
201			#=pod
202			#if (!$self->exists('_COREHANDLE')) {
203			#if (!$self->{_COREHANDLE}) {
204			if (!$core) {
205	joko	1.10
206			#print Dumper($self);
207			#exit;
208
209			my $handlertype = $self->{metainfo}->{type};
210			$handlertype \|\|= '';
211
212			my $err_msg_core = __PACKAGE__ . "[$handlertype]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"";
213	joko	1.12
214			#print $err_msg_core, "\n";
215
216			#if ($self->exists('lock_info') && !$self->{lock_info}->{log_lock}) {
217	joko	1.7	$logger->error( $err_msg_core );
218	joko	1.12	#}
219
220	cvsjoko	1.1	return;
221	joko	1.12
222	cvsjoko	1.1	}
223	joko	1.7	#=cut
224
225			#print "$methodname - 3", "\n";
226	cvsjoko	1.1
227			# try to dispatch method-call to Storage::Handler::*
228			#if ($self->can($methodname)) {
229			#$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" );
230			#my $res = $self->$methodname(@_);
231			#if ($res) { return $res; }
232			#}
233
234	joko	1.7	#print "$methodname - 4", "\n";
235
236	cvsjoko	1.1	# try to dispatch method-call to COREHANDLE
237	joko	1.7	# was:
238			#my $core = $self->{_COREHANDLE};
239			# is:
240			#my $core = $self->getCOREHANDLE();
241
242			#print Dumper($core);
243			#exit;
244
245			# was:
246			#if ($self->{_COREHANDLE}->can($methodname) \|\| $self->{_COREHANDLE}->can("AUTOLOAD")) {
247			# is:
248			if ($core->can($methodname) \|\| $core->can("AUTOLOAD")) {
249	cvsjoko	1.1	#$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
250			#$lock_AUTOLOAD = 1 if ($methodname eq 'insert');
251			if (!$self->{lock_info}->{log_lock}) {
252			#print "method: $methodname", "\n";
253			$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" );
254			} else {
255			# AUTOLOAD - sub is locked to prevent deep recursions if (e.g.) db-inserts cause log-actions to same db itself
256			}
257			#$lock_AUTOLOAD = 0;
258			#$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
259	joko	1.3
260	joko	1.7	#print "calling: $methodname", "\n";
261
262	joko	1.10	# method calls making it until here will get dispatched to the proper handler
263	joko	1.7	return $core->$methodname(@_);
264	joko	1.6
265			} elsif ($self->can($methodname)) {
266	joko	1.10	# try to call specified method inside our or inherited module(s) scope(s)
267	joko	1.6	return $self->$methodname(@_);
268	cvsjoko	1.1	}
269
270			}
271
272			sub DESTROY {
273			my $self = shift;
274	joko	1.7	#if ($self->{COREHANDLE}) {
275			if ($self->exists('_COREHANDLE')) {
276	cvsjoko	1.1	$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );
277
278			my $disconnectMethod = $self->{metainfo}->{disconnectMethod};
279
280			# call "disconnect" or alike on COREHANDLE
281			# was: $self->{COREHANDLE}->disconnect();
282	joko	1.7	$disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() );
283	cvsjoko	1.1
284	joko	1.7	undef $self->{_COREHANDLE};
285	cvsjoko	1.1	}
286			}
287
288	joko	1.7	sub _typeCheck2 {
289	cvsjoko	1.1	my $type = shift;
290			print "type: $type";
291			eval("use Data::Storage::$type;");
292			}
293
294
295			# ====================================================
296			# PUBLIC METHODS
297			# ====================================================
298
299	joko	1.3	sub existsChildNode {
300			my $self = shift;
301			my $nodename = shift;
302			#$nodename = 'TransactionRoutingTable';
303	joko	1.10	$logger->debug( __PACKAGE__ . "->existsChildNode( nodename $nodename )" );
304	joko	1.3	$self->getChildNodes() unless $self->{meta}->{childnodes};
305			my $result = grep(m/$nodename/i, @{$self->{meta}->{childnodes}}); # TODO: use "/i" only on win32-systems!
306			return $result;
307			}
308	cvsjoko	1.1
309	joko	1.3	sub connect_tmp {
310	cvsjoko	1.1
311			# my $self = shift;
312			# my $connectionString = shift;
313			# # todo: patch connectionString to $args
314			# _typeCheck($self->{args}{type});
315
316			}
317
318	joko	1.3
319			# ====================================================
320			# CONCRETE METHOD DUMMIES (croaking via "$logger" by calling "_abstract_function")
321			# ====================================================
322
323			# TODO:
324			# - abstract "abstract methods" to list/hash to be used in AUTOLOAD
325			# e.g.: my @ABSTRACT_METHODS = (qw( connect sendCommand getChildNodes ));
326	joko	1.4	# use Class::XYZ (Construct)
327	joko	1.3	# - build them via anonymous subs
328			# - introduce them via symbols
329
330	joko	1.7	sub getCOREHANDLE {
331			my $self = shift;
332			$self->_abstract_function('getCOREHANDLE');
333			}
334
335	cvsjoko	1.1	sub sendCommand {
336			my $self = shift;
337			$self->_abstract_function('sendCommand');
338	joko	1.11	}
339
340			sub createChildNode {
341			my $self = shift;
342			$self->_abstract_function('createChildNode');
343	joko	1.7	}
344
345			sub existsChildNode_tmp {
346			my $self = shift;
347			$self->_abstract_function('existsChildNode');
348	cvsjoko	1.1	}
349
350			sub getChildNodes {
351			my $self = shift;
352			$self->_abstract_function('getChildNodes');
353			}
354
355			sub configureCOREHANDLE {
356			my $self = shift;
357			$self->_abstract_function('configureCOREHANDLE');
358			}
359
360	joko	1.3	sub getMetaInfo {
361			my $self = shift;
362			$self->_abstract_function('getMetaInfo');
363			return;
364			}
365
366			sub getListUnfiltered {
367			my $self = shift;
368			$self->_abstract_function('getListUnfiltered');
369			return;
370			}
371
372			sub getListFiltered {
373			my $self = shift;
374			$self->_abstract_function('getListFiltered');
375			return;
376			}
377
378			sub sendQuery {
379			my $self = shift;
380			$self->_abstract_function('sendQuery');
381			return;
382			}
383
384			sub connect {
385			my $self = shift;
386			$self->_abstract_function('connect');
387			return;
388			}
389
390			sub testIntegrity {
391			my $self = shift;
392			$self->_abstract_function('testIntegrity');
393			return;
394			}
395
396			sub quoteSql {
397			my $self = shift;
398			$self->_abstract_function('quoteSql');
399	joko	1.4	return;
400			}
401
402			sub eraseAll {
403			my $self = shift;
404			$self->_abstract_function('eraseAll');
405			return;
406			}
407
408			sub createDb {
409			my $self = shift;
410			$self->_abstract_function('createDb');
411	joko	1.9	return;
412			}
413
414			sub dropDb {
415			my $self = shift;
416			$self->_abstract_function('dropDb');
417			return;
418			}
419
420			sub rebuildDb {
421			my $self = shift;
422			$self->_abstract_function('rebuildDb');
423	joko	1.3	return;
424			}
425
426			1;
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