Storage/Handler/Abstract.pm

##    ------------------------------------------------------------------------
##    $Id: Abstract.pm,v 1.16 2003/04/18 16:07:53 joko Exp $
##    ------------------------------------------------------------------------
##    $Log: Abstract.pm,v $
##    Revision 1.16  2003/04/18 16:07:53  joko
##    just use logger if instantiation successed
##
##    Revision 1.15  2003/02/20 20:19:13  joko
##    tried to get auto-disconnect working again - failed with that
##
##    Revision 1.14  2003/02/09 05:12:28  joko
##    + quoting of strings used in sql-queries!
##
##    Revision 1.13  2003/01/30 22:27:05  joko
##    + added new abstract methods
##
##    Revision 1.12  2003/01/30 21:46:32  joko
##    + fixed behaviour of AUTOLOAD-method
##
##    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 Hash::Merge qw( merge );

#use Log::Dispatch::Config;
#Log::Dispatch::Config->configure();

# get logger instance
my $logger;
eval('$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( @_ )" ) if $logger;
    #$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

  if (!$methodname) {
    die("Methodname is not defined!");
    return;
  }

#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";
      my $type = $self->{metainfo}->{type};
      $type ||= '';
      # FIXME!
      #$logger->debug( __PACKAGE__ . "[$type]" . "->" . $methodname . "(@_)" );
      $logger->debug( __PACKAGE__ . "[$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;

return;

  $logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );

  my $disconnectMethod = $self->{metainfo}->{disconnectMethod};
  print "meth: ", $disconnectMethod, "\n";
  
  #$disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() );
  $self->{_COREHANDLE}->$disconnectMethod();
  #$self->$disconnectMethod();

  #my $core1 = $self->getCOREHANDLE() if $self->can('getCOREHANDLE');
  #$core1->$disconnectMethod();

return;

  print "DESTROY-1", "\n";
  #if ($self->{__COREHANDLE}) {
  #if ($self->exists('_COREHANDLE')) {

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

  #if ($self->{STORAGEHANDLE}) {
  if ($core) {
    print "DESTROY-2", "\n";
    $logger->debug( __PACKAGE__ . "[$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;

    # TODO: don't use $self->{meta}->{childnodes} directly in here
    # get it returned from $self->getChildNodes()!!!

    $logger->debug( __PACKAGE__ . "->existsChildNode( nodename=$nodename )" );
    $self->getChildNodes() unless $self->{meta}->{childnodes};

    # quote this, it might contain meta characters which don't work in a regex
      $nodename = quotemeta($nodename);

    # trace
      #print Dumper($self->{meta});
      #print "nodename: $nodename", "\n";
    
    # FIXME: use "/i" only on win32-systems!
    my $result = grep(m/$nodename/i, @{$self->{meta}->{childnodes}});
    
    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;
  }

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

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

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

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

1;
1	joko	1.11	## ------------------------------------------------------------------------
2	joko	1.17	## $Id: Abstract.pm,v 1.16 2003/04/18 16:07:53 joko Exp $
3	joko	1.11	## ------------------------------------------------------------------------
4	joko	1.7	## $Log: Abstract.pm,v $
5	joko	1.17	## Revision 1.16 2003/04/18 16:07:53 joko
6			## just use logger if instantiation successed
7			##
8	joko	1.16	## Revision 1.15 2003/02/20 20:19:13 joko
9			## tried to get auto-disconnect working again - failed with that
10			##
11	joko	1.15	## Revision 1.14 2003/02/09 05:12:28 joko
12			## + quoting of strings used in sql-queries!
13			##
14	joko	1.14	## Revision 1.13 2003/01/30 22:27:05 joko
15			## + added new abstract methods
16			##
17	joko	1.13	## Revision 1.12 2003/01/30 21:46:32 joko
18			## + fixed behaviour of AUTOLOAD-method
19			##
20	joko	1.12	## Revision 1.11 2003/01/20 16:43:18 joko
21			## + better argument-property merging
22			## + debugging-output !!!
23			## + abstract-dummy 'sub createChildNode'
24			##
25	joko	1.11	## Revision 1.10 2003/01/19 02:31:51 joko
26			## + fix to 'sub AUTOLOAD'
27			##
28	joko	1.10	## Revision 1.9 2002/12/19 16:30:23 joko
29			## + added 'sub dropDb' and 'sub rebuildDb' as croakers for concrete implementations of methods in proper handlers
30			##
31	joko	1.9	## Revision 1.8 2002/12/13 21:48:35 joko
32			## + sub _abstract_function
33			##
34	joko	1.8	## Revision 1.7 2002/12/05 07:57:48 joko
35			## + now using Tie::SecureHash as a base for the COREHANDLE
36			## + former public COREHANDLE becomes private _COREHANDLE now
37			##
38	joko	1.7	## Revision 1.6 2002/12/03 15:52:24 joko
39			## + fix/feature: if dispatching to deep core method fails (is not declared), try method at Data::Storage - level
40			##
41			## Revision 1.5 2002/12/01 22:19:33 joko
42			## + just disconnect if COREHANDLE exists
43			##
44			## Revision 1.4 2002/12/01 04:45:38 joko
45			## + sub eraseAll
46			## + sub createDb
47			##
48			## Revision 1.3 2002/11/29 04:58:20 joko
49			## + Storage::Result now uses the same dispatching mechanism like Storage::Handler
50			##
51			## Revision 1.2 2002/10/17 00:08:07 joko
52			## + bugfixes regarding "deep recursion" stuff
53			##
54			## Revision 1.1 2002/10/10 03:44:07 cvsjoko
55			## + new
56	joko	1.11	## ------------------------------------------------------------------------
57	joko	1.7
58	cvsjoko	1.1
59			package Data::Storage::Handler::Abstract;
60
61			use strict;
62			use warnings;
63
64	joko	1.8	use base qw( DesignPattern::Object );
65
66	joko	1.11
67	cvsjoko	1.1	use Data::Dumper;
68	joko	1.7	use Tie::SecureHash;
69			#use Data::Storage::Handler;
70	joko	1.15	use Hash::Merge qw( merge );
71	joko	1.11
72	joko	1.16	#use Log::Dispatch::Config;
73			#Log::Dispatch::Config->configure();
74	cvsjoko	1.1
75			# get logger instance
76	joko	1.16	my $logger;
77			eval('$logger = Log::Dispatch::Config->instance;');
78	cvsjoko	1.1
79			#our $lock_info;
80
81			sub new {
82			my $invocant = shift;
83			my $class = ref($invocant) \|\| $invocant;
84
85			# logging info about the actual handler called
86	joko	1.16	$logger->debug( "$invocant->new( @_ )" ) if $logger;
87	joko	1.2	#$logger->debug( __PACKAGE__ . "->" . "new()" );
88	cvsjoko	1.1
89	joko	1.7	# V1 - arguments become properties automagically / normal perl mode blessing
90			=pod
91			# autovivify passed-in arguments as future object attributes into to-be-blessed hash
92	joko	1.3	my $self = { @_ };
93			# create object from blessed hash-reference
94			bless $self, $class;
95	joko	1.7	=cut
96
97	joko	1.10	#=pod
98	joko	1.7	# V2 - maybe more convenient/secure? utilizing Damian Conway's Tie::SecureHash...
99			my $self = Tie::SecureHash->new(
100			$class,
101			# that's it:
102			'metainfo' => undef,
103			'lock_info' => undef,
104			'_COREHANDLE' => undef,
105			'meta' => undef,
106			'locator' => undef,
107			'dataStorageLayer' => undef,
108			'dbi' => undef,
109			# tries:
110			#'Data::Storage::Handler::Abstract::metainfo' => undef,
111			#'dataStorageLayer'
112			#'Data::Storage::Handler::Abstract::dataStorageLayer' => undef,
113			#'Data::Storage::Handler::Tangram::dataStorageLayer' => undef,
114			#'Data::Dumper::locator' => undef,
115			#$class . '::locator' => undef,
116			#'Data::Storage::Handler::Tangram::locator' => undef,
117			#'Data::Storage::Handler::DBI::locator' => undef,
118			#_protected => ,
119			#__private => ,
120			);
121	joko	1.10	#=cut
122	joko	1.7
123			# merge passed-in arguments to constructor as properties into already blessed secure object
124	joko	1.11
125	joko	1.7	# mungle arguments from array into hash - perl does the job ;)
126	joko	1.11	#my %args = @_;
127			#my %args = ();
128
129			#print Dumper(@_);
130
131	joko	1.7	# merge attributes one-by-one
132			# TODO: deep_copy? / merge_deep?
133	joko	1.11	while (my $elemName = shift @_) {
134			#print "elemName: $elemName", "\n";
135			if (my $elemValue = shift @_) {
136			#print Dumper($elemValue);
137			#print "elemName=$elemName, elemValue=$elemValue", "\n";
138			$self->{$elemName} = $elemValue;
139			}
140			#$self->{$_} = $args{$_};
141			#$self->{$_} = $args{$_};
142	joko	1.7	}
143
144			# V3 - rolling our own security (just for {COREHANDLE} - nothing else) - nope, Tie::SecureHash works wonderful
145			#my $self = { @_ };
146			#bless $self, $class;
147
148
149	joko	1.3
150	cvsjoko	1.1	# handle meta data
151	joko	1.3	#my $metainfo = $self->getMetaInfo($class);
152			my $metainfo = $self->getMetaInfo();
153	cvsjoko	1.1	if (!$metainfo->{disconnectMethod}) { $metainfo->{disconnectMethod} = 'disconnect'; }
154			# type?
155			$invocant =~ s/Data::Storage::Handler:://;
156			$metainfo->{type} = $invocant;
157
158			# direct accessible (non-protected) properties ( was: my $self = { }; )
159	joko	1.3	$self->{metainfo} = $metainfo;
160	cvsjoko	1.1
161			return $self;
162			}
163
164
165	joko	1.10	# TODO: use NEXT.pm inside this mechanism (to avoid repetitions...)
166	cvsjoko	1.1	sub AUTOLOAD {
167
168			# recursion problem to be avoided here!!!
169
170			# - problem: we get recursion-hangs!!! => perl stops with ...
171			# "Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD" at [...]/libs/Data/Storage.pm line 38."
172
173			# - when: if we log to ourselves as a storage-implementation (e.g. via Log::Dispatch::Tangram)
174			# - why: debug-messages are on a very low level including every data-operation to "Data::Storage(::Handler::X)",
175			# so e.g. a "$storage->insert" would trigger another "$storage->insert" itself
176			# which leads to a infinite recursion loop (deep recursion)
177	joko	1.2	# - solution: locks! (by Hack or (maybe) via Perl "local"s)
178	cvsjoko	1.1
179			my $self = shift;
180
181			our $AUTOLOAD;
182			#return if $AUTOLOAD =~ m/::DESTROY$/;
183
184			# find out methodname
185			my $methodname = $AUTOLOAD;
186			$methodname =~ s/^.*:://;
187	joko	1.7
188			#print "method: $methodname", "\n";
189
190			# TODO: document this! handler-private methods listed here will not be triggered (internal use)
191			# in this case, "exists" is a method reserved for Tie::SecureHash,
192			# which encapsulates the perl data structure (HASH) under this object
193			# this is to prevent deep recursion's
194			return if lc $methodname eq 'exists';
195
196	joko	1.12	#print "$methodname - 1", "\n";
197	joko	1.7
198			# TODO: enhance logging/debugging
199			#if (!$self->exists('COREHANDLE')) { return; }
200	cvsjoko	1.1
201			# handle locking (hack)
202	joko	1.10	if ($self->can('exists') && $self->exists('lock_info') && $self->{lock_info}->{last_method} && $methodname eq $self->{lock_info}->{last_method}) {
203	cvsjoko	1.1	$self->{lock_info}->{log_lock} = 1;
204			} else {
205			$self->{lock_info}->{log_lock} = 0;
206			}
207			$self->{lock_info}->{last_method} = $methodname;
208
209	joko	1.12	#print "$methodname - 2", "\n";
210	joko	1.7
211			#print Dumper($self);
212			#exit;
213
214			# get corehandle instance from underlying handler
215			my $core = $self->getCOREHANDLE();
216
217	cvsjoko	1.1	# test for COREHANDLE
218	joko	1.7	#if (!$self->{_COREHANDLE}) {
219			#=pod
220			#if (!$self->exists('_COREHANDLE')) {
221			#if (!$self->{_COREHANDLE}) {
222			if (!$core) {
223	joko	1.10
224			#print Dumper($self);
225			#exit;
226
227			my $handlertype = $self->{metainfo}->{type};
228			$handlertype \|\|= '';
229
230			my $err_msg_core = __PACKAGE__ . "[$handlertype]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"";
231	joko	1.12
232			#print $err_msg_core, "\n";
233
234			#if ($self->exists('lock_info') && !$self->{lock_info}->{log_lock}) {
235	joko	1.7	$logger->error( $err_msg_core );
236	joko	1.12	#}
237
238	cvsjoko	1.1	return;
239	joko	1.12
240	cvsjoko	1.1	}
241	joko	1.7	#=cut
242
243	joko	1.17	if (!$methodname) {
244			die("Methodname is not defined!");
245			return;
246			}
247
248	joko	1.7	#print "$methodname - 3", "\n";
249	cvsjoko	1.1
250			# try to dispatch method-call to Storage::Handler::*
251			#if ($self->can($methodname)) {
252			#$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->" . $methodname . "(@_)" );
253			#my $res = $self->$methodname(@_);
254			#if ($res) { return $res; }
255			#}
256
257	joko	1.7	#print "$methodname - 4", "\n";
258
259	cvsjoko	1.1	# try to dispatch method-call to COREHANDLE
260	joko	1.7	# was:
261			#my $core = $self->{_COREHANDLE};
262			# is:
263			#my $core = $self->getCOREHANDLE();
264
265			#print Dumper($core);
266			#exit;
267
268			# was:
269			#if ($self->{_COREHANDLE}->can($methodname) \|\| $self->{_COREHANDLE}->can("AUTOLOAD")) {
270			# is:
271			if ($core->can($methodname) \|\| $core->can("AUTOLOAD")) {
272	cvsjoko	1.1	#$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
273			#$lock_AUTOLOAD = 1 if ($methodname eq 'insert');
274			if (!$self->{lock_info}->{log_lock}) {
275			#print "method: $methodname", "\n";
276	joko	1.17	my $type = $self->{metainfo}->{type};
277			$type \|\|= '';
278			# FIXME!
279			#$logger->debug( __PACKAGE__ . "[$type]" . "->" . $methodname . "(@_)" );
280			$logger->debug( __PACKAGE__ . "[$type]" . "->" . $methodname );
281	cvsjoko	1.1	} else {
282			# AUTOLOAD - sub is locked to prevent deep recursions if (e.g.) db-inserts cause log-actions to same db itself
283			}
284			#$lock_AUTOLOAD = 0;
285			#$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
286	joko	1.3
287	joko	1.7	#print "calling: $methodname", "\n";
288
289	joko	1.10	# method calls making it until here will get dispatched to the proper handler
290	joko	1.7	return $core->$methodname(@_);
291	joko	1.6
292			} elsif ($self->can($methodname)) {
293	joko	1.10	# try to call specified method inside our or inherited module(s) scope(s)
294	joko	1.6	return $self->$methodname(@_);
295	cvsjoko	1.1	}
296
297			}
298
299			sub DESTROY {
300			my $self = shift;
301	joko	1.15
302			return;
303
304			$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );
305
306			my $disconnectMethod = $self->{metainfo}->{disconnectMethod};
307			print "meth: ", $disconnectMethod, "\n";
308
309			#$disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() );
310			$self->{_COREHANDLE}->$disconnectMethod();
311			#$self->$disconnectMethod();
312
313			#my $core1 = $self->getCOREHANDLE() if $self->can('getCOREHANDLE');
314			#$core1->$disconnectMethod();
315
316			return;
317
318			print "DESTROY-1", "\n";
319			#if ($self->{__COREHANDLE}) {
320			#if ($self->exists('_COREHANDLE')) {
321
322			# get corehandle instance from underlying handler
323			my $core;
324			$core = $self->getCOREHANDLE() if $self->can('getCOREHANDLE');
325
326			#if ($self->{STORAGEHANDLE}) {
327			if ($core) {
328			print "DESTROY-2", "\n";
329	cvsjoko	1.1	$logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );
330
331			my $disconnectMethod = $self->{metainfo}->{disconnectMethod};
332
333			# call "disconnect" or alike on COREHANDLE
334			# was: $self->{COREHANDLE}->disconnect();
335	joko	1.7	$disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() );
336	cvsjoko	1.1
337	joko	1.7	undef $self->{_COREHANDLE};
338	cvsjoko	1.1	}
339			}
340
341	joko	1.7	sub _typeCheck2 {
342	cvsjoko	1.1	my $type = shift;
343			print "type: $type";
344			eval("use Data::Storage::$type;");
345			}
346
347
348			# ====================================================
349			# PUBLIC METHODS
350			# ====================================================
351
352	joko	1.3	sub existsChildNode {
353			my $self = shift;
354			my $nodename = shift;
355	joko	1.14
356			# TODO: don't use $self->{meta}->{childnodes} directly in here
357			# get it returned from $self->getChildNodes()!!!
358
359			$logger->debug( __PACKAGE__ . "->existsChildNode( nodename=$nodename )" );
360	joko	1.3	$self->getChildNodes() unless $self->{meta}->{childnodes};
361	joko	1.14
362			# quote this, it might contain meta characters which don't work in a regex
363			$nodename = quotemeta($nodename);
364
365			# trace
366			#print Dumper($self->{meta});
367			#print "nodename: $nodename", "\n";
368
369			# FIXME: use "/i" only on win32-systems!
370			my $result = grep(m/$nodename/i, @{$self->{meta}->{childnodes}});
371
372	joko	1.3	return $result;
373			}
374	cvsjoko	1.1
375	joko	1.3	sub connect_tmp {
376	cvsjoko	1.1
377			# my $self = shift;
378			# my $connectionString = shift;
379			# # todo: patch connectionString to $args
380			# _typeCheck($self->{args}{type});
381
382			}
383
384	joko	1.3
385			# ====================================================
386			# CONCRETE METHOD DUMMIES (croaking via "$logger" by calling "_abstract_function")
387			# ====================================================
388
389			# TODO:
390			# - abstract "abstract methods" to list/hash to be used in AUTOLOAD
391			# e.g.: my @ABSTRACT_METHODS = (qw( connect sendCommand getChildNodes ));
392	joko	1.4	# use Class::XYZ (Construct)
393	joko	1.3	# - build them via anonymous subs
394			# - introduce them via symbols
395
396	joko	1.7	sub getCOREHANDLE {
397			my $self = shift;
398			$self->_abstract_function('getCOREHANDLE');
399			}
400
401	cvsjoko	1.1	sub sendCommand {
402			my $self = shift;
403			$self->_abstract_function('sendCommand');
404	joko	1.11	}
405
406			sub createChildNode {
407			my $self = shift;
408			$self->_abstract_function('createChildNode');
409	joko	1.7	}
410
411			sub existsChildNode_tmp {
412			my $self = shift;
413			$self->_abstract_function('existsChildNode');
414	cvsjoko	1.1	}
415
416			sub getChildNodes {
417			my $self = shift;
418			$self->_abstract_function('getChildNodes');
419			}
420
421			sub configureCOREHANDLE {
422			my $self = shift;
423			$self->_abstract_function('configureCOREHANDLE');
424			}
425
426	joko	1.3	sub getMetaInfo {
427			my $self = shift;
428			$self->_abstract_function('getMetaInfo');
429			return;
430			}
431
432			sub getListUnfiltered {
433			my $self = shift;
434			$self->_abstract_function('getListUnfiltered');
435			return;
436			}
437
438			sub getListFiltered {
439			my $self = shift;
440			$self->_abstract_function('getListFiltered');
441			return;
442			}
443
444			sub sendQuery {
445			my $self = shift;
446			$self->_abstract_function('sendQuery');
447			return;
448			}
449
450			sub connect {
451			my $self = shift;
452			$self->_abstract_function('connect');
453			return;
454			}
455
456			sub testIntegrity {
457			my $self = shift;
458			$self->_abstract_function('testIntegrity');
459			return;
460			}
461
462			sub quoteSql {
463			my $self = shift;
464			$self->_abstract_function('quoteSql');
465	joko	1.4	return;
466			}
467
468			sub eraseAll {
469			my $self = shift;
470			$self->_abstract_function('eraseAll');
471			return;
472			}
473
474			sub createDb {
475			my $self = shift;
476			$self->_abstract_function('createDb');
477	joko	1.9	return;
478			}
479
480			sub dropDb {
481			my $self = shift;
482			$self->_abstract_function('dropDb');
483			return;
484			}
485
486			sub rebuildDb {
487			my $self = shift;
488			$self->_abstract_function('rebuildDb');
489	joko	1.13	return;
490			}
491
492			sub getDbName {
493			my $self = shift;
494			$self->_abstract_function('getDbName');
495			return;
496			}
497
498			sub testAvailability {
499			my $self = shift;
500			$self->_abstract_function('testAvailability');
501			return;
502			}
503
504			sub isConnected {
505			my $self = shift;
506			$self->_abstract_function('isConnected');
507			return;
508			}
509
510			sub testDsn {
511			my $self = shift;
512			$self->_abstract_function('testDsn');
513	joko	1.3	return;
514			}
515
516			1;
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