/[cvs]/nfo/perl/libs/Data/Storage/Handler/Abstract.pm
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revision 1.6 by joko, Tue Dec 3 15:52:24 2002 UTC revision 1.9 by joko, Thu Dec 19 16:30:23 2002 UTC
# Line 1  Line 1 
1  #################################  ##    --------------------------------------------------------------------------------
2  #  ##    $Id$
3  #  $Id$  ##    --------------------------------------------------------------------------------
4  #  ##    $Log$
5  #  $Log$  ##    Revision 1.9  2002/12/19 16:30:23  joko
6  #  Revision 1.6  2002/12/03 15:52:24  joko  ##    + added 'sub dropDb' and 'sub rebuildDb' as croakers for concrete implementations of methods in proper handlers
7  #  + fix/feature: if dispatching to deep core method fails (is not declared), try method at Data::Storage - level  ##
8  #  ##    Revision 1.8  2002/12/13 21:48:35  joko
9  #  Revision 1.5  2002/12/01 22:19:33  joko  ##    + sub _abstract_function
10  #  + just disconnect if COREHANDLE exists  ##
11  #  ##    Revision 1.7  2002/12/05 07:57:48  joko
12  #  Revision 1.4  2002/12/01 04:45:38  joko  ##    + now using Tie::SecureHash as a base for the COREHANDLE
13  #  + sub eraseAll  ##    + former public COREHANDLE becomes private _COREHANDLE now
14  #  + sub createDb  ##
15  #  ##    Revision 1.6  2002/12/03 15:52:24  joko
16  #  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
17  #  + Storage::Result now uses the same dispatching mechanism like Storage::Handler  ##
18  #  ##    Revision 1.5  2002/12/01 22:19:33  joko
19  #  Revision 1.2  2002/10/17 00:08:07  joko  ##    + just disconnect if COREHANDLE exists
20  #  + bugfixes regarding "deep recursion" stuff  ##
21  #  ##    Revision 1.4  2002/12/01 04:45:38  joko
22  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  ##    + sub eraseAll
23  #  + new  ##    + sub createDb
24  #  ##
25  #  ##    Revision 1.3  2002/11/29 04:58:20  joko
26  #################################  ##    + Storage::Result now uses the same dispatching mechanism like Storage::Handler
27    ##
28    ##    Revision 1.2  2002/10/17 00:08:07  joko
29    ##    + bugfixes regarding "deep recursion" stuff
30    ##
31    ##    Revision 1.1  2002/10/10 03:44:07  cvsjoko
32    ##    + new
33    ##    --------------------------------------------------------------------------------
34    
35    
36  package Data::Storage::Handler::Abstract;  package Data::Storage::Handler::Abstract;
37    
38  use strict;  use strict;
39  use warnings;  use warnings;
40    
41    use base qw( DesignPattern::Object );
42    
43  use Data::Dumper;  use Data::Dumper;
44    use Tie::SecureHash;
45    #use Data::Storage::Handler;
46    
47  # get logger instance  # get logger instance
48  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
# Line 45  sub new { Line 57  sub new {
57      $logger->debug( "$invocant->new( @_ )" );      $logger->debug( "$invocant->new( @_ )" );
58      #$logger->debug( __PACKAGE__ . "->" . "new()" );      #$logger->debug( __PACKAGE__ . "->" . "new()" );
59    
60    # arguments become properties    # V1 - arguments become properties automagically / normal perl mode blessing
61    =pod
62      # autovivify passed-in arguments as future object attributes into to-be-blessed hash
63    my $self = { @_ };    my $self = { @_ };
64    # create object from blessed hash-reference    # create object from blessed hash-reference
65    bless $self, $class;    bless $self, $class;
66    =cut
67    
68    
69      # V2 - maybe more convenient/secure? utilizing Damian Conway's Tie::SecureHash...
70      my $self = Tie::SecureHash->new(
71        $class,
72        # that's it:
73          'metainfo' => undef,
74          'lock_info' => undef,
75          '_COREHANDLE' => undef,
76          'meta' => undef,
77          'locator' => undef,
78          'dataStorageLayer' => undef,
79          'dbi' => undef,
80        # tries:
81          #'Data::Storage::Handler::Abstract::metainfo' => undef,
82          #'dataStorageLayer'
83          #'Data::Storage::Handler::Abstract::dataStorageLayer' => undef,
84          #'Data::Storage::Handler::Tangram::dataStorageLayer' => undef,
85          #'Data::Dumper::locator' => undef,
86          #$class . '::locator' => undef,
87          #'Data::Storage::Handler::Tangram::locator' => undef,
88          #'Data::Storage::Handler::DBI::locator' => undef,
89          #_protected => ,
90          #__private => ,
91      );
92    
93    
94      # merge passed-in arguments to constructor as properties into already blessed secure object
95        
96        # mungle arguments from array into hash - perl does the job  ;)
97        my %args = @_;
98      
99        # merge attributes one-by-one
100        # TODO: deep_copy? / merge_deep?
101        foreach (keys %args) {
102          #print "key: $_", "\n";
103          $self->{$_} = $args{$_};
104        }
105      
106      # V3 - rolling our own security (just for {COREHANDLE} - nothing else)  -  nope, Tie::SecureHash works wonderful
107      #my $self = { @_ };
108      #bless $self, $class;
109      
110      
111    
112    # handle meta data    # handle meta data
113      #my $metainfo = $self->getMetaInfo($class);      #my $metainfo = $self->getMetaInfo($class);
# Line 86  sub AUTOLOAD { Line 145  sub AUTOLOAD {
145    # find out methodname    # find out methodname
146    my $methodname = $AUTOLOAD;    my $methodname = $AUTOLOAD;
147    $methodname =~ s/^.*:://;    $methodname =~ s/^.*:://;
148      
149    #print "method: $methodname", "\n";
150      
151      # TODO: document this! handler-private methods listed here will not be triggered (internal use)
152      # in this case, "exists" is a method reserved for Tie::SecureHash,
153      # which encapsulates the perl data structure (HASH) under this object
154      # this is to prevent deep recursion's
155      return if lc $methodname eq 'exists';
156    
157    #print "$methodname - 1", "\n";
158    
159      # TODO: enhance logging/debugging
160      #if (!$self->exists('COREHANDLE')) { return; }
161    
162    # handle locking (hack)    # handle locking (hack)
163    if ($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}) {
164      $self->{lock_info}->{log_lock} = 1;      $self->{lock_info}->{log_lock} = 1;
165    } else {    } else {
166      $self->{lock_info}->{log_lock} = 0;      $self->{lock_info}->{log_lock} = 0;
167    }    }
168    $self->{lock_info}->{last_method} = $methodname;    $self->{lock_info}->{last_method} = $methodname;
169        
170    #print "$methodname - 2", "\n";
171    
172    #print Dumper($self);
173    #exit;
174    
175      # get corehandle instance from underlying handler
176      my $core = $self->getCOREHANDLE();
177    
178    # test for COREHANDLE    # test for COREHANDLE
179    if (!$self->{COREHANDLE}) {    #if (!$self->{_COREHANDLE}) {
180      #print "no COREHANDLE", "\n";  #=pod
181      if (!$self->{lock_info}->{log_lock}) {    #if (!$self->exists('_COREHANDLE')) {
182        $logger->error( __PACKAGE__ . "[$self->{metainfo}->{type}]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"" );    #if (!$self->{_COREHANDLE}) {
183      if (!$core) {
184        my $err_msg_core = __PACKAGE__ . "[$self->{metainfo}->{type}]" . ": " . "COREHANDLE is undefined while trying to execute method \"$methodname\"";
185    print $err_msg_core, "\n";
186        if ($self->exists('lock_info') && !$self->{lock_info}->{log_lock}) {
187          $logger->error( $err_msg_core );
188      }      }
189      return;      return;
190    }    }
191    #=cut
192    
193    #print "$methodname - 3", "\n";
194    
195    # try to dispatch method-call to Storage::Handler::*    # try to dispatch method-call to Storage::Handler::*
196    #if ($self->can($methodname)) {    #if ($self->can($methodname)) {
# Line 111  sub AUTOLOAD { Line 199  sub AUTOLOAD {
199      #if ($res) { return $res; }      #if ($res) { return $res; }
200    #}    #}
201    
202    #print "$methodname - 4", "\n";
203    
204    # try to dispatch method-call to COREHANDLE    # try to dispatch method-call to COREHANDLE
205    if ($self->{COREHANDLE}->can($methodname) || $self->{COREHANDLE}->can("AUTOLOAD")) {    # was:
206      #my $core = $self->{_COREHANDLE};
207      # is:
208      #my $core = $self->getCOREHANDLE();
209    
210    #print Dumper($core);
211    #exit;
212    
213      # was:
214      #if ($self->{_COREHANDLE}->can($methodname) || $self->{_COREHANDLE}->can("AUTOLOAD")) {
215      # is:
216      if ($core->can($methodname) || $core->can("AUTOLOAD")) {
217      #$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );      #$logger->debug( __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
218      #$lock_AUTOLOAD = 1 if ($methodname eq 'insert');      #$lock_AUTOLOAD = 1 if ($methodname eq 'insert');
219      if (!$self->{lock_info}->{log_lock}) {      if (!$self->{lock_info}->{log_lock}) {
# Line 124  sub AUTOLOAD { Line 225  sub AUTOLOAD {
225      #$lock_AUTOLOAD = 0;      #$lock_AUTOLOAD = 0;
226      #$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );      #$logger->log( level => 'debug', message => __PACKAGE__ . "->" . $methodname . " (AUTOLOAD)" );
227            
228    #print "calling: $methodname", "\n";
229        
230      # 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
231      return $self->{COREHANDLE}->$methodname(@_);      return $core->$methodname(@_);
232        
233    } elsif ($self->can($methodname)) {    } elsif ($self->can($methodname)) {
234      return $self->$methodname(@_);      return $self->$methodname(@_);
# Line 135  sub AUTOLOAD { Line 238  sub AUTOLOAD {
238    
239  sub DESTROY {  sub DESTROY {
240    my $self = shift;    my $self = shift;
241    if ($self->{COREHANDLE}) {    #if ($self->{COREHANDLE}) {
242      if ($self->exists('_COREHANDLE')) {
243      $logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );      $logger->debug( __PACKAGE__ . "[$self->{metainfo}->{type}]" . "->DESTROY" );
244    
245      my $disconnectMethod = $self->{metainfo}->{disconnectMethod};      my $disconnectMethod = $self->{metainfo}->{disconnectMethod};
246    
247      # call "disconnect" or alike on COREHANDLE      # call "disconnect" or alike on COREHANDLE
248      # was: $self->{COREHANDLE}->disconnect();      # was: $self->{COREHANDLE}->disconnect();
249      $disconnectMethod && $self->{COREHANDLE} && ( $self->{COREHANDLE}->$disconnectMethod() );      $disconnectMethod && $self->{_COREHANDLE} && ( $self->{_COREHANDLE}->$disconnectMethod() );
250    
251      undef $self->{COREHANDLE};      undef $self->{_COREHANDLE};
252    }    }
253  }  }
254    
255    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 {  
256    my $type = shift;    my $type = shift;
257    print "type: $type";    print "type: $type";
258    eval("use Data::Storage::$type;");    eval("use Data::Storage::$type;");
# Line 199  sub _typeCheck { Line 294  sub _typeCheck {
294    #   - build them via anonymous subs    #   - build them via anonymous subs
295    #   - introduce them via symbols    #   - introduce them via symbols
296    
297      sub getCOREHANDLE {
298        my $self = shift;
299        $self->_abstract_function('getCOREHANDLE');
300      }
301    
302    sub sendCommand {    sub sendCommand {
303      my $self = shift;      my $self = shift;
304      $self->_abstract_function('sendCommand');      $self->_abstract_function('sendCommand');
305    }    }
306    
307      sub existsChildNode_tmp {
308        my $self = shift;
309        $self->_abstract_function('existsChildNode');
310      }
311    
312    sub getChildNodes {    sub getChildNodes {
313      my $self = shift;      my $self = shift;
314      $self->_abstract_function('getChildNodes');      $self->_abstract_function('getChildNodes');
# Line 268  sub _typeCheck { Line 373  sub _typeCheck {
373      return;      return;
374    }    }
375    
376      sub dropDb {
377        my $self = shift;
378        $self->_abstract_function('dropDb');
379        return;
380      }
381    
382      sub rebuildDb {
383        my $self = shift;
384        $self->_abstract_function('rebuildDb');
385        return;
386      }
387    
388  1;  1;
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