Transfer/Sync/StorageInterface.pm

##    $Id: StorageInterface.pm,v 1.2 2003/02/09 05:05:58 joko Exp $
##
##    Copyright (c) 2002  Andreas Motl <andreas.motl@ilo.de>
##
##    See COPYRIGHT section in pod text below for usage and distribution rights.
##
##    ----------------------------------------------------------------------------------------
##    $Log: StorageInterface.pm,v $
##    Revision 1.2  2003/02/09 05:05:58  joko
##    + major structure changes
##    - refactored code to sister modules
##    + refactored code to this place
##
##    Revision 1.1  2003/01/20 16:58:46  joko
##    + initial check-in: here they are....
##
##    Revision 1.1  2003/01/19 01:23:04  joko
##    + new from Data/Transfer/Sync.pm
##
##    ----------------------------------------------------------------------------------------


package Data::Transfer::Sync::StorageInterface;

use strict;
use warnings;

use mixin::with qw( Data::Transfer::Sync );


# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -   main

use Data::Dumper;
use Hash::Merge qw( merge );
use libdb qw( hash2Sql );
use Data::Transform::Deep qw( hash2object );


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

# this is a shortcut method
# ... let's try to avoid _any_ redundant code in here (ok... - at the cost of method lookups...)
sub _getNodeList {
  my $self = shift;
  my $descent = shift;
  my $filter = shift;
  $logger->debug( __PACKAGE__ . "->_getNodeList( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" );
  #$results ||= $self->{source}->getListUnfiltered($self->{meta}->{source}->{node});
  #$results ||= $self->{meta}->{source}->{storage}->getListUnfiltered($self->{meta}->{source}->{node});
  my $list = $self->{meta}->{$descent}->{storage}->getListFiltered($self->{meta}->{$descent}->{accessorName}, $filter);
#print Dumper($list);
  return $list;
}

sub _resolveNodeIdent {
  my $self = shift;
  my $descent = shift;
  
  # trace
    #print Dumper($self->{node}->{$descent});
    #print Dumper($self);
    #exit;
    
  $logger->debug( __PACKAGE__ . "->_resolveNodeIdent( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" );
  
  # get to the payload
    #my $item = $specifier->{item};
    my $payload = $self->{node}->{$descent}->{payload};

  # resolve method to get to the id of the given item
  # we use global metadata and the given descent for this task
    #my $ident = $self->{$descent}->id($item);
    #my $ident = $self->{meta}->{$descent}->{storage}->id($item);

  # trace
    #print Dumper($self->{meta}->{$descent});
    #exit;

    my $ident;
    my $provider_method = $self->{meta}->{$descent}->{IdentProvider}->{method};
    my $provider_arg = $self->{meta}->{$descent}->{IdentProvider}->{arg};

    # trace
      #print "provider_method: $provider_method", "\n";
      #print "provider_arg: $provider_arg", "\n";
      #print Dumper($payload);

    # resolve to ident
    if (lc $provider_method eq 'property') {
      $ident = $payload->{$provider_arg};

    } elsif (lc $provider_method eq 'storage_method') {
      #$ident = $self->{meta}->{$descent}->{storage}->id($item);
      $ident = $self->{meta}->{$descent}->{storage}->$provider_arg($payload);

    } elsif (lc $provider_method eq 'code') {
      $ident = 'ac';
      
    }
    
    $self->{node}->{$descent}->{ident} = $ident;
    
  return 1 if $ident;

}

# TODO:
# this should be split up into...
#   - a "_statNode" (should just touch the node to check for existance)
#   - a "_loadNode" (should load node completely)
#   - maybe additionally a "loadNodeProperty" (may specify properties to load)
#   - introduce $self->{nodecache} for this purpose
# TODO:
#   should we:
#     - not pass ident in here but resolve it via "$descent"?
#     - refactor this and stuff it with additional debug/error message
#       - this = the way the implicit load mechanism works
sub _statloadNode {

  my $self = shift;
  my $descent = shift;
  my $ident = shift;
  my $force = shift;

  #$logger->debug( __PACKAGE__ . "->_statloadNode( descent=$descent ident=$ident )" );

  # fetch entry to retrieve checksum from
  # was:
  if (!$self->{node}->{$descent} || $force) {
  # is:
  #if (!$self->{node}->{$descent}->{item} || $force) {
    
    if (!$ident) {
      #print "\n", "Attempt to fetch entry implicitely by ident failed: no ident given! This may result in an insert if no write-protection is in the way.", "\n";
      return;
    }
    
    # patch for DBD::CSV
    if ($ident && $ident eq 'Null') {
      return;
    }

    #print Dumper($self->{meta});

    my $query = { 
      node => $self->{meta}->{$descent}->{accessorName}, 
      subnodes => [qw( cs )], 
      criterias => [ 
        { key => $self->{meta}->{$descent}->{IdentProvider}->{arg}, 
           op => 'eq', 
           val => $ident },
      ]
    };

    # trace
      #print "query:", "\n";
      #print Dumper($query);

    # send query and fetch first entry from result
      my $result = $self->{meta}->{$descent}->{storage}->sendQuery($query);
      my $entry = $result->getNextEntry();

    # trace
      #print Dumper($entry);
      #print "pers: " . $self->{meta}->{$descent}->{storage}->is_persistent($entry), "\n";
      #my $state = $self->{meta}->{$descent}->{storage}->_fetch_object_state($entry, { name => 'TransactionHop' } );
      #print Dumper($state);

    # be informed about the status of the query
      my $status = $result->getStatus();

#print Dumper($status);
    
    # TODO: enhance error handling (store inside tc)
    #if (!$row) {
    #  print "\n", "row error", "\n";
    #  next;
    #}

    # these checks run before actually loading payload- and meta-data to node-container
    
      # 1st level - hard error
      if ($status && $status->{err}) {
        $logger->debug( __PACKAGE__ . "->_statloadNode (ident=\"$ident\") failed - hard error (that's ok): $status->{err}" );
        return;
      }
  
      # 2nd level - logical (empty/notfound) error
      if (($status && $status->{empty}) || !$entry) {
        $logger->debug( __PACKAGE__ . "->_statloadNode (ident=\"$ident\") failed - logical error (that's ok)" );
        #print "no entry (logical)", "\n";
        return;
      }

#print Dumper($entry);

    # was:
    # $self->{node}->{$descent}->{ident} = $ident;  
    # is:
    # TODO: re-resolve ident from entry via metadata "IdentProvider" here - like elsewhere
    $self->{node}->{$descent}->{ident} = $ident;
    $self->{node}->{$descent}->{payload} = $entry;

  }
  
  return 1;
  
}


sub _touchNodeSet {
  my $self = shift;

  $logger->debug( __PACKAGE__ . "->touchNodeSet" );

  # check descents/nodes: does descent exist / is node available?
  foreach my $descent (keys %{$self->{meta}}) {
    
    # 1. check metadata of descent(s)
      if (!$self->{meta}->{$descent}) {
        $logger->critical( __PACKAGE__ . "->touchNodeSet: Could not find descent '$descent' in configuration metadata." );
        next;
      }

    # 2. check storage handle(s)
      my $dbkey = $self->{meta}->{$descent}->{dbKey};
      if (!$self->{meta}->{$descent}->{storage}) {
        $logger->critical( __PACKAGE__ . "->touchNodeSet: Could not access storage ( descent='$descent', dbKey='$dbkey' ) - configuration-error?" );
        next;
      }
    
    # 3. check if descents (and nodes?) are actually available....
      # TODO:
      # eventually pre-check mode of access-attempt (read/write) here to provide an "early-croak" if possible
    
    # trace
      # print Dumper($self->{meta}->{$descent}->{storage}->{locator});


      my $dbType = $self->{meta}->{$descent}->{storage}->{locator}->{type};
      my $nodeName = $self->{meta}->{$descent}->{nodeName};
      my $accessorType = $self->{meta}->{$descent}->{accessorType};
      my $accessorName = $self->{meta}->{$descent}->{accessorName};


    # 4. check nodeset

    # debug message containing database type and used/determined accessor name
    $logger->debug( __PACKAGE__ . "->touchNodeSet: Accessing dbType=$dbType, accessorName=$accessorName" );
    
    # if target node(s) do(es) not exist, check if we should create it automagically
    if ($dbType ne 'DBI' && !$self->{meta}->{$descent}->{storage}->existsChildNode($accessorName)) {

      if ($descent eq 'target' && $self->{options}->{target}->{autocreateFolders}) {
        if (!$self->{meta}->{$descent}->{storage}->createChildNode($accessorName)) {
          $logger->critical( __PACKAGE__ . "->touchNodeSet: Could not create node '$self->{meta}->{$descent}->{nodeName}\@$self->{meta}->{$descent}->{dbKey}' [$self->{meta}->{$descent}->{nodeType}]." );
          next;
        }
      } else {
        $logger->critical( __PACKAGE__ . "->touchNodeSet: Could not reach node \"$nodeName\" (accessorName=$accessorName, accessorType=$accessorType) at descent \"$descent\"" );
        next;
      }
    }
    
  }

  # trace
    #print Dumper($self->{meta});
    #exit;

  
  return 1;

}


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};
    }
  }
  
  
  # trace
    #print Dumper($self->{meta});


  # --------------------------------------------------------------------------
  # DBI speaks SQL
  if ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'DBI') {

    # trace
      #print Dumper($map);
      #delete $map->{cs};

    # transfer data
      # TODO: wrap this around '$storageHandle->sendQuery(...)'!?
      my $sql_main;
      if (lc($action) eq 'insert') {
        $sql_main = hash2Sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_INSERT');
      } elsif (lc $action eq 'update') {
        $crit ||= "$self->{meta}->{$descent}->{IdentProvider}->{arg}='$self->{node}->{$descent}->{ident}'";
        $sql_main = hash2Sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_UPDATE', $crit);
      }
      my $sqlHandle = $self->{meta}->{$descent}->{storage}->sendCommand($sql_main);

    # 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}->{nodeType};
    
    # attributes/properties to exclude
      # push declared ones from metadata
      my @exclude = @{$self->{meta}->{$descent}->{subnodes_exclude}};
      # push the attributes associated with the identifier
      if (my $identProvider = $self->{meta}->{$descent}->{IdentProvider}) {
        push @exclude, $identProvider->{arg};
      }

    # trace
      #print Dumper($self->{meta});
      #exit;

    # 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') {

      # make the object persistent in four steps:
      #   - raw create (perl / class tangram scope)
      #   - orm insert (tangram scope)   ... this establishes inheritance - don't try to fill in inherited properties before!
      #      is this a Tangram bug?
      #   - raw fill-in from hash (perl scope)
      #   - orm update (tangram scope)  ... this updates all properties just filled in
      
      
      # ==========================
      # TODO: REVIEW HERE!!!
      # can't we achieve this more elegant?
      #   o use DesignPattern::Object???
      #   o use Hash::Merge!!! (take care about the cloning behaviour)
      
        # check if object exists (is classname a valid perl package/module?)

          # we can just check if the classname is valid here
          if (!$classname) {
            $logger->critical( __PACKAGE__ . "->_modifyNode: classname is undefined" );
            # FIXME: stop syncing here?
            return;
          }
        
          # try to match against the classes known by Class::Tangram
          # FIXME: do "/i" on win32 only!
          my $classname_find = quotemeta($classname);
          if (!grep(m/$classname_find/i, Class::Tangram::known_classes())) {
            $logger->critical( __PACKAGE__ . "->_modifyNode: Classname '$classname' is not known by Class::Tangram" );
            # FIXME: stop syncing here?
            return;
          }
      
        # create new object ... 
          # V1
            # build array to initialize object
            #my @initarray = ();
            #map { push @initarray, $_, undef; } @props;
            #my $object = $classname->new( @initarray );
          # V2
            $object = $classname->new();
          # V3
            # $object = DesignPattern::Object->new($data);

        # ... pass to orm first ...
        $self->{meta}->{$descent}->{storage}->insert($object);
  
        # ... and initialize with empty (undef'd) properties afterwards.
        map { $object->{$_} = undef; } @props;
  
        # trace
          #print "\n";
          #print Dumper($map);
          #print Dumper($object);
          #exit;

        # mix in (merge) values ...
          # TODO: use Hash::Merge here? benchmark!
          # no! we'd need a Object::Merge here! it's *...2object*
          hash2object($object, $map);
  
        # trace
          #print Dumper($object);
          #exit;

      # TODO: REVIEW HERE!!!
      # ==========================

      # ... and re-update@orm.
        $self->{meta}->{$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($object);
        # TODO: use Hash::Merge here???
        hash2object($object, $map);
        #print Dumper($object);
        #exit;

      # update orm
        $self->{meta}->{$descent}->{storage}->update($object);
        
    }

#exit;
    
    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;
    }

  }

}


1;
1	joko	1.3	## $Id: StorageInterface.pm,v 1.2 2003/02/09 05:05:58 joko Exp $
2	joko	1.1	##
3			## Copyright (c) 2002 Andreas Motl <andreas.motl@ilo.de>
4			##
5			## See COPYRIGHT section in pod text below for usage and distribution rights.
6			##
7			## ----------------------------------------------------------------------------------------
8	joko	1.2	## $Log: StorageInterface.pm,v $
9	joko	1.3	## Revision 1.2 2003/02/09 05:05:58 joko
10			## + major structure changes
11			## - refactored code to sister modules
12			## + refactored code to this place
13			##
14	joko	1.2	## Revision 1.1 2003/01/20 16:58:46 joko
15			## + initial check-in: here they are....
16			##
17	joko	1.1	## Revision 1.1 2003/01/19 01:23:04 joko
18			## + new from Data/Transfer/Sync.pm
19			##
20			## ----------------------------------------------------------------------------------------
21
22
23			package Data::Transfer::Sync::StorageInterface;
24
25			use strict;
26			use warnings;
27
28			use mixin::with qw( Data::Transfer::Sync );
29
30
31			# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - main
32
33	joko	1.2	use Data::Dumper;
34			use Hash::Merge qw( merge );
35	joko	1.3	use libdb qw( hash2Sql );
36			use Data::Transform::Deep qw( hash2object );
37	joko	1.2
38
39	joko	1.1	# get logger instance
40			my $logger = Log::Dispatch::Config->instance;
41
42			# this is a shortcut method
43			# ... let's try to avoid _any_ redundant code in here (ok... - at the cost of method lookups...)
44			sub _getNodeList {
45			my $self = shift;
46			my $descent = shift;
47			my $filter = shift;
48	joko	1.2	$logger->debug( __PACKAGE__ . "->_getNodeList( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" );
49	joko	1.1	#$results \|\|= $self->{source}->getListUnfiltered($self->{meta}->{source}->{node});
50			#$results \|\|= $self->{meta}->{source}->{storage}->getListUnfiltered($self->{meta}->{source}->{node});
51	joko	1.2	my $list = $self->{meta}->{$descent}->{storage}->getListFiltered($self->{meta}->{$descent}->{accessorName}, $filter);
52	joko	1.1	#print Dumper($list);
53			return $list;
54			}
55
56			sub _resolveNodeIdent {
57			my $self = shift;
58			my $descent = shift;
59
60	joko	1.3	# trace
61			#print Dumper($self->{node}->{$descent});
62			#print Dumper($self);
63			#exit;
64
65	joko	1.2	$logger->debug( __PACKAGE__ . "->_resolveNodeIdent( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" );
66	joko	1.1
67			# get to the payload
68			#my $item = $specifier->{item};
69			my $payload = $self->{node}->{$descent}->{payload};
70
71			# resolve method to get to the id of the given item
72			# we use global metadata and the given descent for this task
73			#my $ident = $self->{$descent}->id($item);
74			#my $ident = $self->{meta}->{$descent}->{storage}->id($item);
75
76	joko	1.3	# trace
77			#print Dumper($self->{meta}->{$descent});
78			#exit;
79
80	joko	1.1	my $ident;
81			my $provider_method = $self->{meta}->{$descent}->{IdentProvider}->{method};
82			my $provider_arg = $self->{meta}->{$descent}->{IdentProvider}->{arg};
83
84	joko	1.2	# trace
85			#print "provider_method: $provider_method", "\n";
86			#print "provider_arg: $provider_arg", "\n";
87			#print Dumper($payload);
88	joko	1.1
89			# resolve to ident
90			if (lc $provider_method eq 'property') {
91			$ident = $payload->{$provider_arg};
92
93			} elsif (lc $provider_method eq 'storage_method') {
94			#$ident = $self->{meta}->{$descent}->{storage}->id($item);
95			$ident = $self->{meta}->{$descent}->{storage}->$provider_arg($payload);
96
97			} elsif (lc $provider_method eq 'code') {
98			$ident = 'ac';
99
100			}
101
102			$self->{node}->{$descent}->{ident} = $ident;
103
104			return 1 if $ident;
105
106			}
107
108			# TODO:
109			# this should be split up into...
110			# - a "_statNode" (should just touch the node to check for existance)
111			# - a "_loadNode" (should load node completely)
112			# - maybe additionally a "loadNodeProperty" (may specify properties to load)
113			# - introduce $self->{nodecache} for this purpose
114			# TODO:
115			# should we:
116			# - not pass ident in here but resolve it via "$descent"?
117			# - refactor this and stuff it with additional debug/error message
118			# - this = the way the implicit load mechanism works
119			sub _statloadNode {
120
121			my $self = shift;
122			my $descent = shift;
123			my $ident = shift;
124			my $force = shift;
125
126	joko	1.3	#$logger->debug( __PACKAGE__ . "->_statloadNode( descent=$descent ident=$ident )" );
127	joko	1.2
128	joko	1.1	# fetch entry to retrieve checksum from
129			# was:
130			if (!$self->{node}->{$descent} \|\| $force) {
131			# is:
132			#if (!$self->{node}->{$descent}->{item} \|\| $force) {
133
134			if (!$ident) {
135			#print "\n", "Attempt to fetch entry implicitely by ident failed: no ident given! This may result in an insert if no write-protection is in the way.", "\n";
136			return;
137			}
138
139			# patch for DBD::CSV
140			if ($ident && $ident eq 'Null') {
141			return;
142			}
143
144	joko	1.2	#print Dumper($self->{meta});
145	joko	1.1
146			my $query = {
147	joko	1.2	node => $self->{meta}->{$descent}->{accessorName},
148	joko	1.1	subnodes => [qw( cs )],
149			criterias => [
150			{ key => $self->{meta}->{$descent}->{IdentProvider}->{arg},
151			op => 'eq',
152			val => $ident },
153			]
154			};
155
156	joko	1.2	# trace
157			#print "query:", "\n";
158			#print Dumper($query);
159
160			# send query and fetch first entry from result
161			my $result = $self->{meta}->{$descent}->{storage}->sendQuery($query);
162			my $entry = $result->getNextEntry();
163
164			# trace
165			#print Dumper($entry);
166			#print "pers: " . $self->{meta}->{$descent}->{storage}->is_persistent($entry), "\n";
167			#my $state = $self->{meta}->{$descent}->{storage}->_fetch_object_state($entry, { name => 'TransactionHop' } );
168			#print Dumper($state);
169	joko	1.1
170	joko	1.2	# be informed about the status of the query
171			my $status = $result->getStatus();
172	joko	1.1
173			#print Dumper($status);
174
175			# TODO: enhance error handling (store inside tc)
176			#if (!$row) {
177			# print "\n", "row error", "\n";
178			# next;
179			#}
180
181			# these checks run before actually loading payload- and meta-data to node-container
182
183			# 1st level - hard error
184			if ($status && $status->{err}) {
185			$logger->debug( __PACKAGE__ . "->_statloadNode (ident=\"$ident\") failed - hard error (that's ok): $status->{err}" );
186			return;
187			}
188
189			# 2nd level - logical (empty/notfound) error
190			if (($status && $status->{empty}) \|\| !$entry) {
191			$logger->debug( __PACKAGE__ . "->_statloadNode (ident=\"$ident\") failed - logical error (that's ok)" );
192			#print "no entry (logical)", "\n";
193			return;
194			}
195
196			#print Dumper($entry);
197
198			# was:
199			# $self->{node}->{$descent}->{ident} = $ident;
200			# is:
201			# TODO: re-resolve ident from entry via metadata "IdentProvider" here - like elsewhere
202			$self->{node}->{$descent}->{ident} = $ident;
203			$self->{node}->{$descent}->{payload} = $entry;
204
205			}
206
207			return 1;
208
209	joko	1.2	}
210
211
212			sub _touchNodeSet {
213			my $self = shift;
214
215			$logger->debug( __PACKAGE__ . "->touchNodeSet" );
216
217			# check descents/nodes: does descent exist / is node available?
218			foreach my $descent (keys %{$self->{meta}}) {
219
220			# 1. check metadata of descent(s)
221			if (!$self->{meta}->{$descent}) {
222			$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not find descent '$descent' in configuration metadata." );
223			next;
224			}
225
226			# 2. check storage handle(s)
227			my $dbkey = $self->{meta}->{$descent}->{dbKey};
228			if (!$self->{meta}->{$descent}->{storage}) {
229			$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not access storage ( descent='$descent', dbKey='$dbkey' ) - configuration-error?" );
230			next;
231			}
232
233			# 3. check if descents (and nodes?) are actually available....
234			# TODO:
235			# eventually pre-check mode of access-attempt (read/write) here to provide an "early-croak" if possible
236
237			# trace
238			# print Dumper($self->{meta}->{$descent}->{storage}->{locator});
239
240
241			my $dbType = $self->{meta}->{$descent}->{storage}->{locator}->{type};
242			my $nodeName = $self->{meta}->{$descent}->{nodeName};
243			my $accessorType = $self->{meta}->{$descent}->{accessorType};
244			my $accessorName = $self->{meta}->{$descent}->{accessorName};
245
246
247			# 4. check nodeset
248
249			# debug message containing database type and used/determined accessor name
250			$logger->debug( __PACKAGE__ . "->touchNodeSet: Accessing dbType=$dbType, accessorName=$accessorName" );
251
252			# if target node(s) do(es) not exist, check if we should create it automagically
253			if ($dbType ne 'DBI' && !$self->{meta}->{$descent}->{storage}->existsChildNode($accessorName)) {
254
255			if ($descent eq 'target' && $self->{options}->{target}->{autocreateFolders}) {
256			if (!$self->{meta}->{$descent}->{storage}->createChildNode($accessorName)) {
257			$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not create node '$self->{meta}->{$descent}->{nodeName}\@$self->{meta}->{$descent}->{dbKey}' [$self->{meta}->{$descent}->{nodeType}]." );
258			next;
259			}
260			} else {
261			$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not reach node \"$nodeName\" (accessorName=$accessorName, accessorType=$accessorType) at descent \"$descent\"" );
262			next;
263			}
264			}
265
266			}
267
268			# trace
269			#print Dumper($self->{meta});
270			#exit;
271
272
273			return 1;
274
275			}
276
277
278
279			sub _modifyNode {
280			my $self = shift;
281			my $descent = shift;
282			my $action = shift;
283			my $map = shift;
284			my $crit = shift;
285
286			# map for new style callbacks
287			my $map_callbacks = {};
288
289			# checks go first!
290
291			# TODO: this should be reviewed first - before extending ;-)
292			# TODO: this should be extended:
293			# count this cases inside the caller to this sub and provide a better overall message
294			# if this counts still zero in the end:
295			# "No nodes have been touched for modify: Do you have column-headers in your csv file?"
296			if (not defined $self->{node}) {
297			#$logger->critical( __PACKAGE__ . "->_modifyNode failed: \"$descent\" node is empty." );
298			#return;
299			}
300
301			# transfer callback nodes from value map to callback map - handle them afterwards! - (new style callbacks)
302			if (my $callbacks = $self->{meta}->{$descent}->{Callback}) {
303			foreach my $callback (keys %{$callbacks->{write}}) {
304			$map_callbacks->{write}->{$callback} = $map->{$callback};
305			delete $map->{$callback};
306			}
307			}
308
309
310			# trace
311			#print Dumper($self->{meta});
312
313
314			# --------------------------------------------------------------------------
315			# DBI speaks SQL
316			if ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'DBI') {
317
318			# trace
319			#print Dumper($map);
320			#delete $map->{cs};
321
322			# transfer data
323			# TODO: wrap this around '$storageHandle->sendQuery(...)'!?
324			my $sql_main;
325			if (lc($action) eq 'insert') {
326			$sql_main = hash2Sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_INSERT');
327			} elsif (lc $action eq 'update') {
328			$crit \|\|= "$self->{meta}->{$descent}->{IdentProvider}->{arg}='$self->{node}->{$descent}->{ident}'";
329			$sql_main = hash2Sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_UPDATE', $crit);
330			}
331			my $sqlHandle = $self->{meta}->{$descent}->{storage}->sendCommand($sql_main);
332
333			# handle errors
334			if ($sqlHandle->err) {
335			#if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; }
336			$self->{node}->{status}->{error} = {
337			statement => $sql_main,
338			state => $sqlHandle->state,
339			err => $sqlHandle->err,
340			errstr => $sqlHandle->errstr,
341			};
342			} else {
343			$self->{node}->{status}->{ok} = 1;
344			}
345
346
347			# --------------------------------------------------------------------------
348			# Tangram does it the oo-way (naturally)
349			} elsif ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'Tangram') {
350			my $sql_main;
351			my $object;
352
353			# determine classname
354			my $classname = $self->{meta}->{$descent}->{nodeType};
355
356			# attributes/properties to exclude
357			# push declared ones from metadata
358			my @exclude = @{$self->{meta}->{$descent}->{subnodes_exclude}};
359			# push the attributes associated with the identifier
360			if (my $identProvider = $self->{meta}->{$descent}->{IdentProvider}) {
361			push @exclude, $identProvider->{arg};
362			}
363
364			# trace
365			#print Dumper($self->{meta});
366			#exit;
367
368			# new feature:
369			# - check TypeProvider metadata property from other side
370			# - use argument (arg) inside as a classname for object creation on this side
371			#my $otherSide = $self->_otherSide($descent);
372			if (my $typeProvider = $self->{meta}->{$descent}->{TypeProvider}) {
373			#print Dumper($map);
374			$classname = $map->{$typeProvider->{arg}};
375			# remove nodes from map also (push nodes to "subnodes_exclude" list)
376			push @exclude, $typeProvider->{arg};
377			}
378
379			# exclude banned properties (remove from map)
380			#map { delete $self->{node}->{map}->{$_} } @{$self->{args}->{exclude}};
381			map { delete $map->{$_} } @exclude;
382
383			# list of properties
384			my @props = keys %{$map};
385
386			# transfer data
387			if (lc $action eq 'insert') {
388
389			# make the object persistent in four steps:
390			# - raw create (perl / class tangram scope)
391			# - orm insert (tangram scope) ... this establishes inheritance - don't try to fill in inherited properties before!
392			# is this a Tangram bug?
393			# - raw fill-in from hash (perl scope)
394			# - orm update (tangram scope) ... this updates all properties just filled in
395
396
397			# ==========================
398			# TODO: REVIEW HERE!!!
399			# can't we achieve this more elegant?
400			# o use DesignPattern::Object???
401			# o use Hash::Merge!!! (take care about the cloning behaviour)
402
403			# check if object exists (is classname a valid perl package/module?)
404
405			# we can just check if the classname is valid here
406			if (!$classname) {
407			$logger->critical( __PACKAGE__ . "->_modifyNode: classname is undefined" );
408			# FIXME: stop syncing here?
409			return;
410			}
411
412			# try to match against the classes known by Class::Tangram
413			# FIXME: do "/i" on win32 only!
414			my $classname_find = quotemeta($classname);
415			if (!grep(m/$classname_find/i, Class::Tangram::known_classes())) {
416			$logger->critical( __PACKAGE__ . "->_modifyNode: Classname '$classname' is not known by Class::Tangram" );
417			# FIXME: stop syncing here?
418			return;
419			}
420
421			# create new object ...
422			# V1
423			# build array to initialize object
424			#my @initarray = ();
425			#map { push @initarray, $_, undef; } @props;
426			#my $object = $classname->new( @initarray );
427			# V2
428			$object = $classname->new();
429			# V3
430			# $object = DesignPattern::Object->new($data);
431
432			# ... pass to orm first ...
433			$self->{meta}->{$descent}->{storage}->insert($object);
434
435			# ... and initialize with empty (undef'd) properties afterwards.
436			map { $object->{$_} = undef; } @props;
437
438			# trace
439			#print "\n";
440			#print Dumper($map);
441			#print Dumper($object);
442			#exit;
443
444			# mix in (merge) values ...
445			# TODO: use Hash::Merge here? benchmark!
446			# no! we'd need a Object::Merge here! it's ...2object
447			hash2object($object, $map);
448
449			# trace
450			#print Dumper($object);
451			#exit;
452
453			# TODO: REVIEW HERE!!!
454			# ==========================
455
456			# ... and re-update@orm.
457			$self->{meta}->{$descent}->{storage}->update($object);
458
459			# asymmetry: get ident after insert
460			# TODO:
461			# - just do this if it is an IdentAuthority
462			# - use IdentProvider metadata here
463			#print Dumper($self->{meta}->{$descent});
464			my $oid = $self->{meta}->{$descent}->{storage}->id($object);
465			#print "oid: $oid", "\n";
466			$self->{node}->{$descent}->{ident} = $oid;
467
468
469			} elsif (lc $action eq 'update') {
470
471			# get fresh object from orm first
472			$object = $self->{meta}->{$descent}->{storage}->load($self->{node}->{$descent}->{ident});
473
474			#print Dumper($self->{node});
475
476			# mix in values
477			#print Dumper($object);
478			# TODO: use Hash::Merge here???
479			hash2object($object, $map);
480			#print Dumper($object);
481			#exit;
482
483			# update orm
484			$self->{meta}->{$descent}->{storage}->update($object);
485
486			}
487
488			#exit;
489
490			my $error = 0;
491
492			# handle new style callbacks - this is a HACK - do this without an eval!
493			#print Dumper($map);
494			#print "cb: ", Dumper($self->{meta}->{$descent}->{Callback});
495			#print Dumper($map_callbacks);
496			foreach my $node (keys %{$map_callbacks->{write}}) {
497			#print Dumper($node);
498			my $perl_callback = $self->{meta}->{$descent}->{node} . '::' . $node . '_write';
499			my $evalstring = $perl_callback . '( { object => $object, value => $map_callbacks->{write}->{$node}, storage => $self->{meta}->{$descent}->{storage} } );';
500			#print $evalstring, "\n"; exit;
501			eval($evalstring);
502			if ($@) {
503			$error = 1;
504			print $@, "\n";
505			}
506
507			#print "after eval", "\n";
508
509			if (!$error) {
510			# re-update@orm
511			$self->{meta}->{$descent}->{storage}->update($object);
512			}
513			}
514
515			# handle errors
516			if ($error) {
517			#print "error", "\n";
518			=pod
519			my $sqlHandle;
520			#if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; }
521			$self->{node}->{status}->{error} = {
522			statement => $sql_main,
523			state => $sqlHandle->state,
524			err => $sqlHandle->err,
525			errstr => $sqlHandle->errstr,
526			};
527			=cut
528			# rollback....
529			#print "rollback", "\n";
530			$self->{meta}->{$descent}->{storage}->erase($object);
531			#print "after rollback", "\n";
532			} else {
533			$self->{node}->{status}->{ok} = 1;
534			}
535
536			}
537
538	joko	1.1	}
539
540
541			1;
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