/[cvs]/nfo/perl/libs/Data/Storage/Handler/Abstract.pm
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revision 1.5 by joko, Sun Dec 1 22:19:33 2002 UTC revision 1.8 by joko, Fri Dec 13 21:48:35 2002 UTC
# Line 1  Line 1 
1  #################################  ##    --------------------------------------------------------------------------------
2  #  ##    $Id$
3  #  $Id$  ##    --------------------------------------------------------------------------------
4  #  ##    $Log$
5  #  $Log$  ##    Revision 1.8  2002/12/13 21:48:35  joko
6  #  Revision 1.5  2002/12/01 22:19:33  joko  ##    + sub _abstract_function
7  #  + just disconnect if COREHANDLE exists  ##
8  #  ##    Revision 1.7  2002/12/05 07:57:48  joko
9  #  Revision 1.4  2002/12/01 04:45:38  joko  ##    + now using Tie::SecureHash as a base for the COREHANDLE
10  #  + sub eraseAll  ##    + former public COREHANDLE becomes private _COREHANDLE now
11  #  + sub createDb  ##
12  #  ##    Revision 1.6  2002/12/03 15:52:24  joko
13  #  Revision 1.3  2002/11/29 04:58:20  joko  ##    + fix/feature: if dispatching to deep core method fails (is not declared), try method at Data::Storage - level
14  #  + Storage::Result now uses the same dispatching mechanism like Storage::Handler  ##
15  #  ##    Revision 1.5  2002/12/01 22:19:33  joko
16  #  Revision 1.2  2002/10/17 00:08:07  joko  ##    + just disconnect if COREHANDLE exists
17  #  + bugfixes regarding "deep recursion" stuff  ##
18  #  ##    Revision 1.4  2002/12/01 04:45:38  joko
19  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  ##    + sub eraseAll
20  #  + new  ##    + sub createDb
21  #  ##
22  #  ##    Revision 1.3  2002/11/29 04:58:20  joko
23  #################################  ##    + Storage::Result now uses the same dispatching mechanism like Storage::Handler
24    ##
25    ##    Revision 1.2  2002/10/17 00:08:07  joko
26    ##    + bugfixes regarding "deep recursion" stuff
27    ##
28    ##    Revision 1.1  2002/10/10 03:44:07  cvsjoko
29    ##    + new
30    ##    --------------------------------------------------------------------------------
31    
32    
33  package Data::Storage::Handler::Abstract;  package Data::Storage::Handler::Abstract;
34    
35  use strict;  use strict;
36  use warnings;  use warnings;
37    
38    use base qw( DesignPattern::Object );
39    
40  use Data::Dumper;  use Data::Dumper;
41    use Tie::SecureHash;
42    #use Data::Storage::Handler;
43    
44  # get logger instance  # get logger instance
45  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
# Line 42  sub new { Line 54  sub new {
54      $logger->debug( "$invocant->new( @_ )" );      $logger->debug( "$invocant->new( @_ )" );
55      #$logger->debug( __PACKAGE__ . "->" . "new()" );      #$logger->debug( __PACKAGE__ . "->" . "new()" );
56    
57    # arguments become properties    # V1 - arguments become properties automagically / normal perl mode blessing
58    =pod
59      # autovivify passed-in arguments as future object attributes into to-be-blessed hash
60    my $self = { @_ };    my $self = { @_ };
61    # create object from blessed hash-reference    # create object from blessed hash-reference
62    bless $self, $class;    bless $self, $class;
63    =cut
64    
65    
66      # V2 - maybe more convenient/secure? utilizing Damian Conway's Tie::SecureHash...
67      my $self = Tie::SecureHash->new(
68        $class,
69        # that's it:
70          'metainfo' => undef,
71          'lock_info' => undef,
72          '_COREHANDLE' => undef,
73          'meta' => undef,
74          'locator' => undef,
75          'dataStorageLayer' => undef,
76          'dbi' => undef,
77        # tries:
78          #'Data::Storage::Handler::Abstract::metainfo' => undef,
79          #'dataStorageLayer'
80          #'Data::Storage::Handler::Abstract::dataStorageLayer' => undef,
81          #'Data::Storage::Handler::Tangram::dataStorageLayer' => undef,
82          #'Data::Dumper::locator' => undef,
83          #$class . '::locator' => undef,
84          #'Data::Storage::Handler::Tangram::locator' => undef,
85          #'Data::Storage::Handler::DBI::locator' => undef,
86          #_protected => ,
87          #__private => ,
88      );
89    
90    
91      # merge passed-in arguments to constructor as properties into already blessed secure object
92        
93        # mungle arguments from array into hash - perl does the job  ;)
94        my %args = @_;
95      
96        # merge attributes one-by-one
97        # TODO: deep_copy? / merge_deep?
98        foreach (keys %args) {
99          #print "key: $_", "\n";
100          $self->{$_} = $args{$_};
101        }
102      
103      # V3 - rolling our own security (just for {COREHANDLE} - nothing else)  -  nope, Tie::SecureHash works wonderful
104      #my $self = { @_ };
105      #bless $self, $class;
106      
107      
108    
109    # handle meta data    # handle meta data
110      #my $metainfo = $self->getMetaInfo($class);      #my $metainfo = $self->getMetaInfo($class);
# Line 83  sub AUTOLOAD { Line 142  sub AUTOLOAD {
142    # find out methodname    # find out methodname
143    my $methodname = $AUTOLOAD;    my $methodname = $AUTOLOAD;
144    $methodname =~ s/^.*:://;    $methodname =~ s/^.*:://;
145      
146    #print "method: $methodname", "\n";
147      
148      # TODO: document this! handler-private methods listed here will not be triggered (internal use)
149      # in this case, "exists" is a method reserved for Tie::SecureHash,
150      # which encapsulates the perl data structure (HASH) under this object
151      # this is to prevent deep recursion's
152      return if lc $methodname eq 'exists';
153    
154    #print "$methodname - 1", "\n";
155    
156      # TODO: enhance logging/debugging
157      #if (!$self->exists('COREHANDLE')) { return; }
158    
159    # handle locking (hack)    # handle locking (hack)
160    if ($self->{lock_info}->{last_method} && $methodname eq $self->{lock_info}->{last_method}) {    if ($self->exists('lock_info') && $self->{lock_info}->{last_method} && $methodname eq $self->{lock_info}->{last_method}) {
161      $self->{lock_info}->{log_lock} = 1;      $self->{lock_info}->{log_lock} = 1;
162    } else {    } else {
163      $self->{lock_info}->{log_lock} = 0;      $self->{lock_info}->{log_lock} = 0;
164    }    }
165    $self->{lock_info}->{last_method} = $methodname;    $self->{lock_info}->{last_method} = $methodname;
166        
167    #print "$methodname - 2", "\n";
168    
169    #print Dumper($self);
170    #exit;
171    
172      # get corehandle instance from underlying handler
173      my $core = $self->getCOREHANDLE();
174    
175    # test for COREHANDLE    # test for COREHANDLE
176    if (!$self->{COREHANDLE}) {    #if (!$self->{_COREHANDLE}) {
177      #print "no COREHANDLE", "\n";  #=pod
178      if (!$self->{lock_info}->{log_lock}) {    #if (!$self->exists('_COREHANDLE')) {
179        $logger->error( __PACKAGE__ . "[$self->{metainfo}->{type}]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"" );    #if (!$self->{_COREHANDLE}) {
180      if (!$core) {
181        my $err_msg_core = __PACKAGE__ . "[$self->{metainfo}->{type}]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"";
182    print $err_msg_core, "\n";
183        if ($self->exists('lock_info') && !$self->{lock_info}->{log_lock}) {
184          $logger->error( $err_msg_core );
185      }      }
186      return;      return;
187    }    }
188    #=cut
189    
190    #print "$methodname - 3", "\n";
191    
192    # try to dispatch method-call to Storage::Handler::*    # try to dispatch method-call to Storage::Handler::*
193    #if ($self->can($methodname)) {    #if ($self->can($methodname)) {
# Line 108  sub AUTOLOAD { Line 196  sub AUTOLOAD {
196      #if ($res) { return $res; }      #if ($res) { return $res; }
197    #}    #}
198    
199    #print "$methodname - 4", "\n";
200    
201    # try to dispatch method-call to COREHANDLE    # try to dispatch method-call to COREHANDLE
202    if ($self->{COREHANDLE}->can($methodname) || $self->{COREHANDLE}->can("AUTOLOAD")) {    # was:
203      #my $core = $self->{_COREHANDLE};
204      # is:
205      #my $core = $self->getCOREHANDLE();
206    
207    #print Dumper($core);
208    #exit;
209    
210      # was:
211      #if ($self->{_COREHANDLE}->can($methodname) || $self->{_COREHANDLE}->can("AUTOLOAD")) {
212      # is:
213      if ($core->can($methodname) || $core->can("AUTOLOAD")) {
214      #$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );      #$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
215      #$lock_AUTOLOAD = 1 if ($methodname eq 'insert');      #$lock_AUTOLOAD = 1 if ($methodname eq 'insert');
216      if (!$self->{lock_info}->{log_lock}) {      if (!$self->{lock_info}->{log_lock}) {
# Line 121  sub AUTOLOAD { Line 222  sub AUTOLOAD {
222      #$lock_AUTOLOAD = 0;      #$lock_AUTOLOAD = 0;
223      #$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );      #$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
224            
225    #print "calling: $methodname", "\n";
226        
227      # method calls doing it until here will get dispatched to the proper handler      # method calls doing it until here will get dispatched to the proper handler
228      return $self->{COREHANDLE}->$methodname(@_);      return $core->$methodname(@_);
229      
230      } elsif ($self->can($methodname)) {
231        return $self->$methodname(@_);
232    }    }
233    
234  }  }
235    
236  sub DESTROY {  sub DESTROY {
237    my $self = shift;    my $self = shift;
238    if ($self->{COREHANDLE}) {    #if ($self->{COREHANDLE}) {
239      if ($self->exists('_COREHANDLE')) {
240      $logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );      $logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );
241    
242      my $disconnectMethod = $self->{metainfo}->{disconnectMethod};      my $disconnectMethod = $self->{metainfo}->{disconnectMethod};
243    
244      # call "disconnect" or alike on COREHANDLE      # call "disconnect" or alike on COREHANDLE
245      # was: $self->{COREHANDLE}->disconnect();      # was: $self->{COREHANDLE}->disconnect();
246      $disconnectMethod && $self->{COREHANDLE} && ( $self->{COREHANDLE}->$disconnectMethod() );      $disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() );
247    
248      undef $self->{COREHANDLE};      undef $self->{_COREHANDLE};
249    }    }
250  }  }
251    
252    sub _typeCheck2 {
 sub _abstract_function {  
   my $self = shift;  
   my $fName = shift;  
   my $class = ref($self);  
   $logger->error( __PACKAGE__ . ": function \"$fName\" is an abstract method, please implement it in \"$class\"");  
   #exit;  
 }  
   
 sub _typeCheck {  
253    my $type = shift;    my $type = shift;
254    print "type: $type";    print "type: $type";
255    eval("use Data::Storage::$type;");    eval("use Data::Storage::$type;");
# Line 193  sub _typeCheck { Line 291  sub _typeCheck {
291    #   - build them via anonymous subs    #   - build them via anonymous subs
292    #   - introduce them via symbols    #   - introduce them via symbols
293    
294      sub getCOREHANDLE {
295        my $self = shift;
296        $self->_abstract_function('getCOREHANDLE');
297      }
298    
299    sub sendCommand {    sub sendCommand {
300      my $self = shift;      my $self = shift;
301      $self->_abstract_function('sendCommand');      $self->_abstract_function('sendCommand');
302    }    }
303    
304      sub existsChildNode_tmp {
305        my $self = shift;
306        $self->_abstract_function('existsChildNode');
307      }
308    
309    sub getChildNodes {    sub getChildNodes {
310      my $self = shift;      my $self = shift;
311      $self->_abstract_function('getChildNodes');      $self->_abstract_function('getChildNodes');
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