/[cvs]/nfo/perl/libs/Data/Transfer/Sync/Core.pm
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revision 1.3 by joko, Mon Jan 20 17:01:14 2003 UTC revision 1.4 by joko, Sun Feb 9 05:01:10 2003 UTC
# Line 6  Line 6 
6  ##  ##
7  ##    ----------------------------------------------------------------------------------------  ##    ----------------------------------------------------------------------------------------
8  ##    $Log$  ##    $Log$
9    ##    Revision 1.4  2003/02/09 05:01:10  joko
10    ##    + major structure changes
11    ##    - refactored code to sister modules
12    ##
13  ##    Revision 1.3  2003/01/20 17:01:14  joko  ##    Revision 1.3  2003/01/20 17:01:14  joko
14  ##    + cosmetics and debugging  ##    + cosmetics and debugging
15  ##    + probably refactored code to new plugin-modules 'Metadata.pm' and/or 'StorageInterface.pm' (guess it was the last one...)  ##    + probably refactored code to new plugin-modules 'Metadata.pm' and/or 'StorageInterface.pm' (guess it was the last one...)
# Line 76  use mixin::with qw( Data::Transfer::Sync Line 80  use mixin::with qw( Data::Transfer::Sync
80  use Data::Dumper;  use Data::Dumper;
81    
82  use misc::HashExt;  use misc::HashExt;
 use libp qw( md5_base64 );  
 use libdb qw( quotesql hash2Sql );  
 use Data::Transform::Deep qw( hash2object refexpr2perlref );  
83  use Data::Compare::Struct qw( getDifference isEmpty );  use Data::Compare::Struct qw( getDifference isEmpty );
84  use Data::Storage::Container;  use Data::Storage::Container;
85  use DesignPattern::Object;  use DesignPattern::Object;
# Line 118  sub _init { Line 119  sub _init {
119    
120  sub _initV1 {  sub _initV1 {
121    my $self = shift;    my $self = shift;
122      $logger->debug( __PACKAGE__ . "->_initV1" );
123      die("this should not be reached!");
124    # tag storages with id-authority and checksum-provider information    # tag storages with id-authority and checksum-provider information
125    # TODO: better store tag inside metadata to hold bits together!    # TODO: better store tag inside metadata to hold bits together!
126    map { $self->{container}->{storage}->{$_}->{isIdentAuthority} = 1 } @{$self->{id_authorities}};    map { $self->{container}->{storage}->{$_}->{isIdentAuthority} = 1 } @{$self->{id_authorities}};
# Line 127  sub _initV1 { Line 130  sub _initV1 {
130    
131    
132  # TODO: abstract the hardwired use of "source" and "target" in here somehow - hmmmm.......  /(="§/%???  # TODO: abstract the hardwired use of "source" and "target" in here somehow - hmmmm.......  /(="§/%???
133  sub _syncNodes {  sub _run {
134    
135    my $self = shift;    my $self = shift;
136        
137      #print "verbose: ", $self->{verbose}, "\n";
138      $self->{verbose} = 1;
139      
140      $logger->debug( __PACKAGE__ . "->_run" );
141    
142      # for statistics
143    my $tc = OneLineDumpHash->new( {} );    my $tc = OneLineDumpHash->new( {} );
144    my $results;    my $results;
145        
# Line 150  sub _syncNodes { Line 159  sub _syncNodes {
159    
160    # checkpoint: do we actually have a list to iterate through?    # checkpoint: do we actually have a list to iterate through?
161    if (!$results || !@{$results}) {    if (!$results || !@{$results}) {
162      $logger->notice( __PACKAGE__ . "->syncNodes: No nodes to synchronize." );      $logger->notice( __PACKAGE__ . "->_run: No nodes to synchronize." );
163      return;      return;
164    }    }
165    
166    
167    
168      # check if we actually *have* a synchronization method
169      if (!$self->{options}->{metadata}->{syncMethod}) {
170        $logger->critical( __PACKAGE__ . "->_run: No synchronization method (checksum|timestamp) specified" );
171        return;
172      }
173        
174        
175    # dereference    # dereference
176    my @results = @{$results};    my @results = @{$results};
# Line 223  sub _syncNodes { Line 241  sub _syncNodes {
241      #if (!$identOK && lc $self->{args}->{direction} ne 'import') {      #if (!$identOK && lc $self->{args}->{direction} ne 'import') {
242      if (!$identOK) {      if (!$identOK) {
243        #print Dumper($self->{meta}->{source});        #print Dumper($self->{meta}->{source});
244        $logger->critical( __PACKAGE__ . "->syncNodes: No ident found in source node ( nodeName='$self->{meta}->{source}->{nodeName}', nodeType='$self->{meta}->{source}->{nodeType}') try to \"prepare\" this node first?" );        $logger->critical( __PACKAGE__ . "->_run: No ident found in source node ( nodeName='$self->{meta}->{source}->{nodeName}', nodeType='$self->{meta}->{source}->{nodeType}') try to \"prepare\" this node first?" );
245        return;        return;
246      }      }
247    
248        #print "l" if $self->{verbose};
249      my $statOK = $self->_statloadNode('target', $self->{node}->{source}->{ident});      my $statOK = $self->_statloadNode('target', $self->{node}->{source}->{ident});
250    
251      # mark node as new either if there's no ident or if stat/load failed      # mark node as new either if there's no ident or if stat/load failed
# Line 237  sub _syncNodes { Line 256  sub _syncNodes {
256    
257  #print "checksum", "\n";  #print "checksum", "\n";
258            
259        print ":" if $self->{verbose};
260    
261        #print Dumper($self);
262        
263      # determine status of entry by synchronization method      # determine status of entry by synchronization method
264      if ( (lc $self->{args}->{method} eq 'checksum') ) {      if ( lc $self->{options}->{metadata}->{syncMethod} eq 'checksum' ) {
265      #if ( $statOK && (lc $self->{args}->{method} eq 'checksum') ) {      #if ( $statOK && (lc $self->{args}->{method} eq 'checksum') ) {
266      #if ( !$self->{node}->{status}->{new} && (lc $self->{args}->{method} eq 'checksum') ) {      #if ( !$self->{node}->{status}->{new} && (lc $self->{args}->{method} eq 'checksum') ) {
267                
268        # TODO:      # calculate checksum of source node
       # is this really worth a "critical"???  
       # no - it should just be a debug appendix i believe  
   
 #print "readcs", "\n";  
         
       # calculate checksum of source node  
269        #$self->_calcChecksum('source');        #$self->_calcChecksum('source');
270        if (!$self->_readChecksum('source')) {        if (!$self->_readChecksum('source')) {
271          $logger->critical( __PACKAGE__ . "->_readChecksum: Could not find \"source\" entry with ident=\"$self->{node}->{source}->{ident}\"" );          $logger->warning( __PACKAGE__ . "->_run: Could not find \"source\" entry with ident=\"$self->{node}->{source}->{ident}\"" );
272          $tc->{skip}++;          $tc->{skip}++;
273          print "s" if $self->{verbose};          print "s" if $self->{verbose};
274          next;          next;
# Line 273  sub _syncNodes { Line 290  sub _syncNodes {
290        # determine if entry is "new" or "dirty"        # determine if entry is "new" or "dirty"
291        # after all, this seems to be the point where the hammer falls.....        # after all, this seems to be the point where the hammer falls.....
292        print "c" if $self->{verbose};        print "c" if $self->{verbose};
293    #print Dumper($self->{node});
294    #exit;
295        $self->{node}->{status}->{new} = !$self->{node}->{target}->{checksum};        $self->{node}->{status}->{new} = !$self->{node}->{target}->{checksum};
296        if (!$self->{node}->{status}->{new}) {        if (!$self->{node}->{status}->{new}) {
297          $self->{node}->{status}->{dirty} =          $self->{node}->{status}->{dirty} =
# Line 282  sub _syncNodes { Line 301  sub _syncNodes {
301            $self->{args}->{force};            $self->{args}->{force};
302        }        }
303    
304        } else {
305          $logger->warning( __PACKAGE__ . "->_run: Synchronization method '$self->{options}->{metadata}->{syncMethod}' is not implemented" );
306          $tc->{skip}++;
307          print "s" if $self->{verbose};
308          next;
309          
310      }      }
311    
312      # first reaction on entry-status: continue with next entry if the current is already "in sync"      # first reaction on entry-status: continue with next entry if the current is already "in sync"
# Line 291  sub _syncNodes { Line 316  sub _syncNodes {
316      }      }
317    
318      # build map to actually transfer the data from source to target      # build map to actually transfer the data from source to target
319      $self->_buildMap();      $self->buildAttributeMap();
320    
321    
322  #print Dumper($self->{node}); exit;  #print Dumper($self->{node}); exit;
# Line 302  sub _syncNodes { Line 327  sub _syncNodes {
327      if ($self->{meta}->{target}->{storage}->{isWriteProtected}) {      if ($self->{meta}->{target}->{storage}->{isWriteProtected}) {
328        $tc->{attempt_transfer}++;        $tc->{attempt_transfer}++;
329        print "\n" if $self->{verbose};        print "\n" if $self->{verbose};
330        $logger->notice( __PACKAGE__ . "->syncNodes: Target is write-protected. Will not insert or modify node. " .        $logger->notice( __PACKAGE__ . "->_run: Target is write-protected. Will not insert or modify node. " .
331            "(Ident: $self->{node}->{source}->{ident} " . "Dump:\n" . Dumper($self->{node}->{source}->{payload}) . ")" );            "(Ident: $self->{node}->{source}->{ident} " . "Dump:\n" . Dumper($self->{node}->{source}->{payload}) . ")" );
332        print "\n" if $self->{verbose};        print "\n" if $self->{verbose};
333        $tc->{skip}++;        $tc->{skip}++;
334        next;        next;
335      }      }
336    
337    #print Dumper($self);
338    #exit;
339    
340      # transfer contents of map to target      # transfer contents of map to target
341      if ($self->{node}->{status}->{new}) {      if ($self->{node}->{status}->{new}) {
342        $tc->{attempt_new}++;        $tc->{attempt_new}++;
# Line 337  sub _syncNodes { Line 365  sub _syncNodes {
365        print "e" if $self->{verbose};        print "e" if $self->{verbose};
366      }      }
367            
368        # trace
369          #print Dumper($self);
370          #exit;
371        
372      # change ident in source (take from target), if transfer was ok and target is an IdentAuthority      # change ident in source (take from target), if transfer was ok and target is an IdentAuthority
373      # this is (for now) called a "retransmit" indicated by a "r"-character when verbosing      # this is (for now) called a "retransmit" indicated by a "r"-character when verbosing
374      if ($self->{node}->{status}->{ok} && $self->{meta}->{target}->{storage}->{isIdentAuthority}) {      if ($self->{node}->{status}->{ok} && $self->{options}->{target}->{storage}->{idAuthority}) {
375        print "r" if $self->{verbose};        print "r" if $self->{verbose};
376        #print Dumper($self->{meta});        #print Dumper($self->{meta});
377        #print Dumper($self->{node});        #print Dumper($self->{node});
# Line 347  sub _syncNodes { Line 379  sub _syncNodes {
379        $self->_doModifySource_IdentChecksum($self->{node}->{target}->{ident});        $self->_doModifySource_IdentChecksum($self->{node}->{target}->{ident});
380      }      }
381    
     print ":" if $self->{verbose};  
   
382    }    }
383    
384    print "\n" if $self->{verbose};    print "\n" if $self->{verbose};
# Line 364  sub _syncNodes { Line 394  sub _syncNodes {
394            
395      # todo!!!      # todo!!!
396      #sysevent( { usermsg => $msg, level => $level }, $taskEvent );      #sysevent( { usermsg => $msg, level => $level }, $taskEvent );
397      $logger->info( __PACKAGE__ . "->syncNodes: $msg" );      $logger->info( __PACKAGE__ . "->_run: $msg" );
398    
399    return $tc;    return $tc;
400    
# Line 415  sub _dumpCompact { Line 445  sub _dumpCompact {
445  }  }
446    
447    
 sub _calcChecksum {  
   
   my $self = shift;  
   my $descent = shift;  
   my $specifier = shift;  
   
   # calculate checksum for current object  
     my $ident = $self->{node}->{$descent}->{ident};  
     
   # build dump of this node  
     my $payload = $self->{node}->{$descent}->{payload};  
     #my $dump = $ident . "\n" . $item->quickdump();  
     #my $dump = $ident . "\n" . Dumper($item);  
     my $dump = $ident . "\n" . $self->_dumpCompact($payload);  
     
   # TODO: $logger->dump( ... );  
     #$logger->debug( __PACKAGE__ . ": " . $dump );  
     #$logger->dump( __PACKAGE__ . ": " . $dump );  
     
   # calculate checksum from dump  
     # note: the 32-bit integer hash from DBI seems  
     # to generate duplicates with small payloads already in ranges of hundreds of items/rows!!!  
     # try to avoid to use it or try to use it only for payloads greater than, hmmm, let's say 30 chars?  
     # (we had about 15 chars average per item (row))  
   
     # md5-based fingerprint, base64 encoded (from Digest::MD5)  
       $self->{node}->{$descent}->{checksum} = md5_base64($dump) . '==';  
     # 32-bit integer "hash" value (maybe faster?) (from DBI)  
       #$self->{node}->{$descent}->{checksum} = DBI::hash($dump, 1);  
   
   # signal good  
   return 1;  
   
 }  
   
   
 sub _readChecksum {  
   my $self = shift;  
   
   my $descent = shift;  
   
   #print "getcheck:", "\n"; print Dumper($self->{node}->{$descent});  
     
   if (!$self->{node}->{$descent}) {  
     # signal checksum bad  
     return;  
   }  
   
   # get checksum for current entry  
   # TODO: don't have the checksum column/property hardcoded as "cs" here, make this configurable somehow  
   
   if ($self->{meta}->{$descent}->{storage}->{isChecksumAuthority}) {  
     #$self->{node}->{$descent}->{checksum} = $entry->{cs};  
     #$self->{node}->{$descent}->{checksum} = $self->_calcChecksum($descent); # $entry->{cs};  
     #print "descent: $descent", "\n";  
     $self->_calcChecksum($descent);  
     #print "checksum: ", $self->{node}->{$descent}->{checksum}, "\n";  
   } else {  
   
     #$self->{node}->{$descent}->{checksum} = $entry->{cs};  
     $self->{node}->{$descent}->{checksum} = $self->{node}->{$descent}->{payload}->{cs};  
   }  
   
   # signal checksum good  
   return 1;  
   
 }  
   
   
 sub _buildMap {  
   
  my $self = shift;  
   
   # field-structure for building sql  
   # mapping of sql-fieldnames to object-attributes  
     $self->{node}->{map} = {};  
   
     # manually set ...  
       # ... object-id  
       $self->{node}->{map}->{$self->{meta}->{target}->{IdentProvider}->{arg}} = $self->{node}->{source}->{ident};  
       # ... checksum  
       $self->{node}->{map}->{cs} = $self->{node}->{source}->{checksum};  
   
 #print "sqlmap: ", Dumper($self->{node}->{map}), "\n";  
   
     # for transferring flat structures via simple (1:1) mapping  
     # TODO: diff per property / property value  
   
     if ($self->{args}->{mapping}) {  
       # apply mapping from $self->{args}->{mapping} to $self->{node}->{map}  
       #foreach my $key (@{$self->{meta}->{source}->{childnodes}}) {  
       my @childnodes = @{$self->{meta}->{source}->{childnodes}};  
       for (my $mapidx = 0; $mapidx <= $#childnodes; $mapidx++) {  
         #my $map_right = $self->{args}->{mapping}->{$key};  
           
         $self->{node}->{source}->{propcache} = {};  
         $self->{node}->{target}->{propcache} = {};  
           
         # get property name  
         $self->{node}->{source}->{propcache}->{property} = $self->{meta}->{source}->{childnodes}->[$mapidx];  
         $self->{node}->{target}->{propcache}->{property} = $self->{meta}->{target}->{childnodes}->[$mapidx];  
         #print "map: $map_right", "\n";  
   
         # get property value  
         my $value;  
           
         # detect for callback - old style - (maybe the better???)  
         if (ref($self->{node}->{target}->{map}) eq 'CODE') {  
           #$value = &$map_right($objClone);  
         } else {  
           # plain (scalar?) value  
           #$value = $objClone->{$map_right};  
           $self->{node}->{source}->{propcache}->{value} = $self->{node}->{source}->{payload}->{$self->{node}->{source}->{propcache}->{property}};  
         }  
         #$self->{node}->{map}->{$key} = $value;  
           
         # detect expression  
         # for transferring deeply nested structures described by expressions  
         #print "val: $self->{node}->{source}->{propcache}->{value}", "\n";  
         if ($self->{node}->{source}->{propcache}->{property} =~ s/^expr://) {  
             
           # create an anonymous sub to act as callback target dispatcher  
             my $cb_dispatcher = sub {  
               #print "===============  CALLBACK DISPATCHER", "\n";  
               #print "ident: ", $self->{node}->{source}->{ident}, "\n";  
               #return $self->{node}->{source}->{ident};  
                 
             };  
             
   
 #print Dumper($self->{node});  
             
           # build callback map for helper function  
           #my $cbmap = { $self->{meta}->{source}->{IdentProvider}->{arg} => $cb_dispatcher };  
           my $cbmap = {};  
           my $value = refexpr2perlref($self->{node}->{source}->{payload}, $self->{node}->{source}->{propcache}->{property}, $cbmap);  
           $self->{node}->{source}->{propcache}->{value} = $value;  
         }  
   
         # encode values dependent on type of underlying storage here - expand cases...  
         my $storage_type = $self->{meta}->{target}->{storage}->{locator}->{type};  
         if ($storage_type eq 'DBI') {  
           # ...for sql  
           $self->{node}->{source}->{propcache}->{value} = quotesql($self->{node}->{source}->{propcache}->{value});  
         }  
          elsif ($storage_type eq 'Tangram') {  
           # iso? utf8 already possible?  
           
         } elsif ($storage_type eq 'LDAP') {  
           # TODO: encode utf8 here?  
         }  
   
         # store value to transfer map  
         $self->{node}->{map}->{$self->{node}->{target}->{propcache}->{property}} = $self->{node}->{source}->{propcache}->{value};  
   
       }  
     }  
   
       
   # TODO: $logger->dump( ... );  
   #$logger->debug( "sqlmap:" . "\n" . Dumper($self->{node}->{map}) );  
 #print "sqlmap: ", Dumper($self->{node}->{map}), "\n";  
 #print "entrystatus: ", Dumper($self->{node}), "\n";  
   
 }  
   
   
   
 sub _modifyNode {  
   my $self = shift;  
   my $descent = shift;  
   my $action = shift;  
   my $map = shift;  
   my $crit = shift;  
   
   # map for new style callbacks  
   my $map_callbacks = {};  
   
   # checks go first!  
     
     # TODO: this should be reviewed first - before extending  ;-)  
     # TODO: this should be extended:  
     # count this cases inside the caller to this sub and provide a better overall message  
     # if this counts still zero in the end:  
     #     "No nodes have been touched for modify: Do you have column-headers in your csv file?"  
     if (not defined $self->{node}) {  
       #$logger->critical( __PACKAGE__ . "->_modifyNode failed: \"$descent\" node is empty." );  
       #return;  
     }  
   
   # transfer callback nodes from value map to callback map - handle them afterwards! - (new style callbacks)  
   if (my $callbacks = $self->{meta}->{$descent}->{Callback}) {  
     foreach my $callback (keys %{$callbacks->{write}}) {  
       $map_callbacks->{write}->{$callback} = $map->{$callback};  
       delete $map->{$callback};  
     }  
   }  
     
     
   #print Dumper($self->{meta});  
   
   # DBI speaks SQL  
   if ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'DBI') {  
   
 #print Dumper($self->{node});  
     my $sql_main;  
     # translate map to sql  
     #print $action, "\n"; exit;  
     #print $self->{meta}->{$descent}->{node}, "\n"; exit;  
     #print "action:";  
     #print $action, "\n";  
 #$action = "anc";  
 #print "yai", "\n";  
   
 #print Dumper($map);  
 #delete $map->{cs};  
   
     if (lc($action) eq 'insert') {  
       $sql_main = hash2Sql($self->{meta}->{$descent}->{node}, $map, 'SQL_INSERT');  
     } elsif (lc $action eq 'update') {  
       $crit ||= "$self->{meta}->{$descent}->{IdentProvider}->{arg}='$self->{node}->{$descent}->{ident}'";  
       $sql_main = hash2Sql($self->{meta}->{$descent}->{node}, $map, 'SQL_UPDATE', $crit);  
     }  
   
 #$sql_main = "UPDATE currencies_csv SET oid='abcdef' WHERE text='Australian Dollar' AND key='AUD';";  
 #$sql_main = "UPDATE currencies_csv SET oid='huhu2' WHERE ekey='AUD'";  
   
 #print "sql: ", $sql_main, "\n";  
 #exit;  
   
     # transfer data  
     my $sqlHandle = $self->{meta}->{$descent}->{storage}->sendCommand($sql_main);  
   
 #exit;  
   
     # handle errors  
     if ($sqlHandle->err) {  
       #if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; }  
       $self->{node}->{status}->{error} = {  
         statement => $sql_main,  
         state => $sqlHandle->state,  
         err => $sqlHandle->err,  
         errstr => $sqlHandle->errstr,  
       };  
     } else {  
       $self->{node}->{status}->{ok} = 1;  
     }  
   
   # Tangram does it the oo-way (naturally)  
   } elsif ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'Tangram') {  
     my $sql_main;  
     my $object;  
   
     # determine classname  
     my $classname = $self->{meta}->{$descent}->{node};  
       
     # properties to exclude  
     my @exclude = @{$self->{meta}->{$descent}->{subnodes_exclude}};  
   
   
     if (my $identProvider = $self->{meta}->{$descent}->{IdentProvider}) {  
       push @exclude, $identProvider->{arg};  
     }  
   
     # new feature:  
     #     - check TypeProvider metadata property from other side  
     #     - use argument (arg) inside as a classname for object creation on this side  
     #my $otherSide = $self->_otherSide($descent);  
     if (my $typeProvider = $self->{meta}->{$descent}->{TypeProvider}) {  
       #print Dumper($map);  
       $classname = $map->{$typeProvider->{arg}};  
       # remove nodes from map also (push nodes to "subnodes_exclude" list)  
       push @exclude, $typeProvider->{arg};  
     }  
       
     # exclude banned properties (remove from map)  
     #map { delete $self->{node}->{map}->{$_} } @{$self->{args}->{exclude}};  
     map { delete $map->{$_} } @exclude;  
   
     # list of properties  
     my @props = keys %{$map};  
       
     # transfer data  
     if (lc $action eq 'insert') {  
   
       # build array to initialize object  
       #my @initarray = ();  
       #map { push @initarray, $_, undef; } @props;  
   
       # make the object persistent in four steps:  
       #   - raw create (perl / class tangram scope)  
       #   - engine insert (tangram scope)   ... this establishes inheritance - don't try to fill in inherited properties before!  
       #   - raw fill-in from hash (perl scope)  
       #   - engine update (tangram scope)  ... this updates all properties just filled in  
         
       # create new object ...  
       #my $object = $classname->new( @initarray );  
       $object = $classname->new();  
         
       # ... pass to orm ...  
       $self->{meta}->{$descent}->{storage}->insert($object);  
   
       # ... and initialize with empty (undef'd) properties.  
       #print Dumper(@props);  
       map { $object->{$_} = undef; } @props;  
   
       # mix in values ...  
       hash2object($object, $map);  
   
       # ... and re-update@orm.  
 #print Dumper($object);  
       $self->{meta}->{$descent}->{storage}->update($object);  
   
       # asymmetry: get ident after insert  
       # TODO:  
       #   - just do this if it is an IdentAuthority  
       #   - use IdentProvider metadata here  
 #print Dumper($self->{meta}->{$descent});  
       my $oid = $self->{meta}->{$descent}->{storage}->id($object);  
 #print "oid: $oid", "\n";  
       $self->{node}->{$descent}->{ident} = $oid;  
   
   
     } elsif (lc $action eq 'update') {  
         
       # get fresh object from orm first  
       $object = $self->{meta}->{$descent}->{storage}->load($self->{node}->{$descent}->{ident});  
   
 #print Dumper($self->{node});  
         
       # mix in values  
       #print Dumper($object);  
       hash2object($object, $map);  
       #print Dumper($object);  
       #exit;  
       $self->{meta}->{$descent}->{storage}->update($object);  
     }  
   
     my $error = 0;  
   
     # handle new style callbacks - this is a HACK - do this without an eval!  
     #print Dumper($map);  
     #print "cb: ", Dumper($self->{meta}->{$descent}->{Callback});  
     #print Dumper($map_callbacks);  
     foreach my $node (keys %{$map_callbacks->{write}}) {  
       #print Dumper($node);  
       my $perl_callback = $self->{meta}->{$descent}->{node} . '::' . $node . '_write';  
       my $evalstring = $perl_callback . '( { object => $object, value => $map_callbacks->{write}->{$node}, storage => $self->{meta}->{$descent}->{storage} } );';  
       #print $evalstring, "\n"; exit;  
       eval($evalstring);  
       if ($@) {  
         $error = 1;  
         print $@, "\n";  
       }  
         
       #print "after eval", "\n";  
         
       if (!$error) {  
         # re-update@orm  
         $self->{meta}->{$descent}->{storage}->update($object);  
       }  
     }  
     
     # handle errors  
     if ($error) {  
       #print "error", "\n";  
 =pod  
       my $sqlHandle;  
       #if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; }  
       $self->{node}->{status}->{error} = {  
         statement => $sql_main,  
         state => $sqlHandle->state,  
         err => $sqlHandle->err,  
         errstr => $sqlHandle->errstr,  
       };  
 =cut  
       # rollback....  
       #print "rollback", "\n";  
       $self->{meta}->{$descent}->{storage}->erase($object);  
       #print "after rollback", "\n";  
     } else {  
       $self->{node}->{status}->{ok} = 1;  
     }  
   
   
   }  
   
 }  
448    
449  sub _doTransferToTarget {  sub _doTransferToTarget {
450    my $self = shift;    my $self = shift;
451    my $action = shift;    my $action = shift;
452      #print Dumper($self->{node});
453      #exit;
454    $self->_modifyNode('target', $action, $self->{node}->{map});    $self->_modifyNode('target', $action, $self->{node}->{map});
455  }  }
456    
457    
458  sub _doModifySource_IdentChecksum {  sub _doModifySource_IdentChecksum {
459    my $self = shift;    my $self = shift;
460    my $ident_new = shift;    my $ident_new = shift;
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