Transfer/Sync/StorageInterface.pm

##    $Id: StorageInterface.pm,v 1.4 2003/02/14 14:14:38 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 1.4  2003/02/14 14:14:38  joko
##    + new code refactored here
##
##    Revision 1.3  2003/02/11 07:54:55  joko
##    + modified module usage
##    + debugging trials
##
##    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;

=pod
  #print "isa: ", UNIVERSAL::isa($self->{meta}->{$descent}->{storage}), "\n";

  # this seems to be the first time we access this side, 
  # so just check (again) for a valid storage handle
  if (! ref $self->{meta}->{$descent}->{storage}) {
    $logger->critical( __PACKAGE__ . "->_statloadNode( descent=$descent ident=$ident ): Storage handle undefined!" );
    return;
  }
=cut

  #$logger->debug( __PACKAGE__ . "->_statloadNode( descent=$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;
      }
    
    # 2.b check storage handle type
      my $dbType = $self->{meta}->{$descent}->{storage}->{locator}->{type};
      if (!$dbType) {
        $logger->critical( __PACKAGE__ . "->touchNodeSet: Storage ( descent='$descent', dbKey='$dbkey' ) has no 'dbType' - 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 $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);

      # ------------  half-redundant: make $self->callCallback($object, $value, $opts)
      my $perl_callback = $self->{meta}->{$descent}->{nodeType} . '::' . $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;
        $logger->error( __PACKAGE__ . "->_modifyNode: $@" );
        next;
      }
      # ------------  half-redundant: make $self->callCallback($object, $value, $opts)
      
      #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;
    }

  }

}

sub _erase_all {
  my $self = shift;
  my $descent = shift;
  #my $node = shift;
  #print Dumper($self->{meta}->{$descent});
  #my $node = $self->{meta}->{$descent}->{nodeName};
  my $node = $self->{meta}->{$descent}->{accessorName};
  $logger->debug( __PACKAGE__ . "->_erase_all( node $node )" );
  $self->{meta}->{$descent}->{storage}->eraseAll($node);
}

1;
__END__
1	joko	1.5	## $Id: StorageInterface.pm,v 1.4 2003/02/14 14:14:38 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	1.5	## Revision 1.4 2003/02/14 14:14:38 joko
10			## + new code refactored here
11			##
12	joko	1.4	## Revision 1.3 2003/02/11 07:54:55 joko
13			## + modified module usage
14			## + debugging trials
15			##
16	joko	1.3	## Revision 1.2 2003/02/09 05:05:58 joko
17			## + major structure changes
18			## - refactored code to sister modules
19			## + refactored code to this place
20			##
21	joko	1.2	## Revision 1.1 2003/01/20 16:58:46 joko
22			## + initial check-in: here they are....
23			##
24	joko	1.1	## Revision 1.1 2003/01/19 01:23:04 joko
25			## + new from Data/Transfer/Sync.pm
26			##
27			## ----------------------------------------------------------------------------------------
28
29
30			package Data::Transfer::Sync::StorageInterface;
31
32			use strict;
33			use warnings;
34
35			use mixin::with qw( Data::Transfer::Sync );
36
37
38			# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - main
39
40	joko	1.2	use Data::Dumper;
41			use Hash::Merge qw( merge );
42	joko	1.3	use libdb qw( hash2Sql );
43			use Data::Transform::Deep qw( hash2object );
44	joko	1.2
45
46	joko	1.1	# get logger instance
47			my $logger = Log::Dispatch::Config->instance;
48
49			# this is a shortcut method
50			# ... let's try to avoid _any_ redundant code in here (ok... - at the cost of method lookups...)
51			sub _getNodeList {
52			my $self = shift;
53			my $descent = shift;
54			my $filter = shift;
55	joko	1.2	$logger->debug( __PACKAGE__ . "->_getNodeList( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" );
56	joko	1.1	#$results \|\|= $self->{source}->getListUnfiltered($self->{meta}->{source}->{node});
57			#$results \|\|= $self->{meta}->{source}->{storage}->getListUnfiltered($self->{meta}->{source}->{node});
58	joko	1.2	my $list = $self->{meta}->{$descent}->{storage}->getListFiltered($self->{meta}->{$descent}->{accessorName}, $filter);
59	joko	1.1	#print Dumper($list);
60			return $list;
61			}
62
63			sub _resolveNodeIdent {
64			my $self = shift;
65			my $descent = shift;
66
67	joko	1.3	# trace
68			#print Dumper($self->{node}->{$descent});
69			#print Dumper($self);
70			#exit;
71
72	joko	1.2	$logger->debug( __PACKAGE__ . "->_resolveNodeIdent( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" );
73	joko	1.1
74			# get to the payload
75			#my $item = $specifier->{item};
76			my $payload = $self->{node}->{$descent}->{payload};
77
78			# resolve method to get to the id of the given item
79			# we use global metadata and the given descent for this task
80			#my $ident = $self->{$descent}->id($item);
81			#my $ident = $self->{meta}->{$descent}->{storage}->id($item);
82
83	joko	1.3	# trace
84			#print Dumper($self->{meta}->{$descent});
85			#exit;
86
87	joko	1.1	my $ident;
88			my $provider_method = $self->{meta}->{$descent}->{IdentProvider}->{method};
89			my $provider_arg = $self->{meta}->{$descent}->{IdentProvider}->{arg};
90
91	joko	1.2	# trace
92			#print "provider_method: $provider_method", "\n";
93			#print "provider_arg: $provider_arg", "\n";
94			#print Dumper($payload);
95	joko	1.1
96			# resolve to ident
97			if (lc $provider_method eq 'property') {
98			$ident = $payload->{$provider_arg};
99
100			} elsif (lc $provider_method eq 'storage_method') {
101			#$ident = $self->{meta}->{$descent}->{storage}->id($item);
102			$ident = $self->{meta}->{$descent}->{storage}->$provider_arg($payload);
103
104			} elsif (lc $provider_method eq 'code') {
105			$ident = 'ac';
106
107			}
108
109			$self->{node}->{$descent}->{ident} = $ident;
110
111			return 1 if $ident;
112
113			}
114
115			# TODO:
116			# this should be split up into...
117			# - a "_statNode" (should just touch the node to check for existance)
118			# - a "_loadNode" (should load node completely)
119			# - maybe additionally a "loadNodeProperty" (may specify properties to load)
120			# - introduce $self->{nodecache} for this purpose
121			# TODO:
122			# should we:
123			# - not pass ident in here but resolve it via "$descent"?
124			# - refactor this and stuff it with additional debug/error message
125			# - this = the way the implicit load mechanism works
126			sub _statloadNode {
127
128			my $self = shift;
129			my $descent = shift;
130			my $ident = shift;
131			my $force = shift;
132
133	joko	1.5	=pod
134			#print "isa: ", UNIVERSAL::isa($self->{meta}->{$descent}->{storage}), "\n";
135
136			# this seems to be the first time we access this side,
137			# so just check (again) for a valid storage handle
138			if (! ref $self->{meta}->{$descent}->{storage}) {
139			$logger->critical( __PACKAGE__ . "->_statloadNode( descent=$descent ident=$ident ): Storage handle undefined!" );
140			return;
141			}
142			=cut
143
144	joko	1.3	#$logger->debug( __PACKAGE__ . "->_statloadNode( descent=$descent ident=$ident )" );
145	joko	1.2
146	joko	1.1	# fetch entry to retrieve checksum from
147			# was:
148			if (!$self->{node}->{$descent} \|\| $force) {
149			# is:
150			#if (!$self->{node}->{$descent}->{item} \|\| $force) {
151
152			if (!$ident) {
153			#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";
154			return;
155			}
156
157			# patch for DBD::CSV
158			if ($ident && $ident eq 'Null') {
159			return;
160			}
161
162	joko	1.2	#print Dumper($self->{meta});
163	joko	1.1
164			my $query = {
165	joko	1.2	node => $self->{meta}->{$descent}->{accessorName},
166	joko	1.1	subnodes => [qw( cs )],
167			criterias => [
168			{ key => $self->{meta}->{$descent}->{IdentProvider}->{arg},
169			op => 'eq',
170			val => $ident },
171			]
172			};
173
174	joko	1.2	# trace
175			#print "query:", "\n";
176			#print Dumper($query);
177
178			# send query and fetch first entry from result
179			my $result = $self->{meta}->{$descent}->{storage}->sendQuery($query);
180			my $entry = $result->getNextEntry();
181
182			# trace
183			#print Dumper($entry);
184			#print "pers: " . $self->{meta}->{$descent}->{storage}->is_persistent($entry), "\n";
185			#my $state = $self->{meta}->{$descent}->{storage}->_fetch_object_state($entry, { name => 'TransactionHop' } );
186			#print Dumper($state);
187	joko	1.1
188	joko	1.2	# be informed about the status of the query
189			my $status = $result->getStatus();
190	joko	1.1
191			#print Dumper($status);
192
193			# TODO: enhance error handling (store inside tc)
194			#if (!$row) {
195			# print "\n", "row error", "\n";
196			# next;
197			#}
198
199			# these checks run before actually loading payload- and meta-data to node-container
200
201			# 1st level - hard error
202			if ($status && $status->{err}) {
203			$logger->debug( __PACKAGE__ . "->_statloadNode (ident=\"$ident\") failed - hard error (that's ok): $status->{err}" );
204			return;
205			}
206
207			# 2nd level - logical (empty/notfound) error
208			if (($status && $status->{empty}) \|\| !$entry) {
209			$logger->debug( __PACKAGE__ . "->_statloadNode (ident=\"$ident\") failed - logical error (that's ok)" );
210			#print "no entry (logical)", "\n";
211			return;
212			}
213
214			#print Dumper($entry);
215
216			# was:
217			# $self->{node}->{$descent}->{ident} = $ident;
218			# is:
219			# TODO: re-resolve ident from entry via metadata "IdentProvider" here - like elsewhere
220			$self->{node}->{$descent}->{ident} = $ident;
221			$self->{node}->{$descent}->{payload} = $entry;
222
223			}
224
225			return 1;
226
227	joko	1.2	}
228
229
230			sub _touchNodeSet {
231			my $self = shift;
232
233			$logger->debug( __PACKAGE__ . "->touchNodeSet" );
234
235			# check descents/nodes: does descent exist / is node available?
236			foreach my $descent (keys %{$self->{meta}}) {
237
238			# 1. check metadata of descent(s)
239			if (!$self->{meta}->{$descent}) {
240			$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not find descent '$descent' in configuration metadata." );
241			next;
242			}
243
244			# 2. check storage handle(s)
245			my $dbkey = $self->{meta}->{$descent}->{dbKey};
246			if (!$self->{meta}->{$descent}->{storage}) {
247			$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not access storage ( descent='$descent', dbKey='$dbkey' ) - configuration-error?" );
248			next;
249			}
250
251	joko	1.5	# 2.b check storage handle type
252			my $dbType = $self->{meta}->{$descent}->{storage}->{locator}->{type};
253			if (!$dbType) {
254			$logger->critical( __PACKAGE__ . "->touchNodeSet: Storage ( descent='$descent', dbKey='$dbkey' ) has no 'dbType' - configuration-error?" );
255			next;
256			}
257
258	joko	1.2	# 3. check if descents (and nodes?) are actually available....
259			# TODO:
260			# eventually pre-check mode of access-attempt (read/write) here to provide an "early-croak" if possible
261
262			# trace
263			# print Dumper($self->{meta}->{$descent}->{storage}->{locator});
264
265
266			my $nodeName = $self->{meta}->{$descent}->{nodeName};
267			my $accessorType = $self->{meta}->{$descent}->{accessorType};
268			my $accessorName = $self->{meta}->{$descent}->{accessorName};
269
270
271			# 4. check nodeset
272
273			# debug message containing database type and used/determined accessor name
274			$logger->debug( __PACKAGE__ . "->touchNodeSet: Accessing dbType=$dbType, accessorName=$accessorName" );
275
276			# if target node(s) do(es) not exist, check if we should create it automagically
277			if ($dbType ne 'DBI' && !$self->{meta}->{$descent}->{storage}->existsChildNode($accessorName)) {
278
279			if ($descent eq 'target' && $self->{options}->{target}->{autocreateFolders}) {
280			if (!$self->{meta}->{$descent}->{storage}->createChildNode($accessorName)) {
281			$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not create node '$self->{meta}->{$descent}->{nodeName}\@$self->{meta}->{$descent}->{dbKey}' [$self->{meta}->{$descent}->{nodeType}]." );
282			next;
283			}
284			} else {
285			$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not reach node \"$nodeName\" (accessorName=$accessorName, accessorType=$accessorType) at descent \"$descent\"" );
286			next;
287			}
288			}
289
290			}
291
292			# trace
293			#print Dumper($self->{meta});
294			#exit;
295
296
297			return 1;
298
299			}
300
301
302
303			sub _modifyNode {
304			my $self = shift;
305			my $descent = shift;
306			my $action = shift;
307			my $map = shift;
308			my $crit = shift;
309
310			# map for new style callbacks
311			my $map_callbacks = {};
312
313			# checks go first!
314
315			# TODO: this should be reviewed first - before extending ;-)
316			# TODO: this should be extended:
317			# count this cases inside the caller to this sub and provide a better overall message
318			# if this counts still zero in the end:
319			# "No nodes have been touched for modify: Do you have column-headers in your csv file?"
320			if (not defined $self->{node}) {
321			#$logger->critical( __PACKAGE__ . "->_modifyNode failed: \"$descent\" node is empty." );
322			#return;
323			}
324
325			# transfer callback nodes from value map to callback map - handle them afterwards! - (new style callbacks)
326			if (my $callbacks = $self->{meta}->{$descent}->{Callback}) {
327			foreach my $callback (keys %{$callbacks->{write}}) {
328			$map_callbacks->{write}->{$callback} = $map->{$callback};
329			delete $map->{$callback};
330			}
331			}
332
333
334			# trace
335			#print Dumper($self->{meta});
336
337
338			# --------------------------------------------------------------------------
339			# DBI speaks SQL
340			if ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'DBI') {
341
342			# trace
343			#print Dumper($map);
344			#delete $map->{cs};
345
346			# transfer data
347			# TODO: wrap this around '$storageHandle->sendQuery(...)'!?
348			my $sql_main;
349			if (lc($action) eq 'insert') {
350			$sql_main = hash2Sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_INSERT');
351			} elsif (lc $action eq 'update') {
352			$crit \|\|= "$self->{meta}->{$descent}->{IdentProvider}->{arg}='$self->{node}->{$descent}->{ident}'";
353			$sql_main = hash2Sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_UPDATE', $crit);
354			}
355			my $sqlHandle = $self->{meta}->{$descent}->{storage}->sendCommand($sql_main);
356
357			# handle errors
358			if ($sqlHandle->err) {
359			#if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; }
360			$self->{node}->{status}->{error} = {
361			statement => $sql_main,
362			state => $sqlHandle->state,
363			err => $sqlHandle->err,
364			errstr => $sqlHandle->errstr,
365			};
366			} else {
367			$self->{node}->{status}->{ok} = 1;
368			}
369
370
371			# --------------------------------------------------------------------------
372			# Tangram does it the oo-way (naturally)
373			} elsif ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'Tangram') {
374			my $sql_main;
375			my $object;
376
377			# determine classname
378			my $classname = $self->{meta}->{$descent}->{nodeType};
379
380			# attributes/properties to exclude
381			# push declared ones from metadata
382			my @exclude = @{$self->{meta}->{$descent}->{subnodes_exclude}};
383			# push the attributes associated with the identifier
384			if (my $identProvider = $self->{meta}->{$descent}->{IdentProvider}) {
385			push @exclude, $identProvider->{arg};
386			}
387
388			# trace
389			#print Dumper($self->{meta});
390			#exit;
391
392			# new feature:
393			# - check TypeProvider metadata property from other side
394			# - use argument (arg) inside as a classname for object creation on this side
395			#my $otherSide = $self->_otherSide($descent);
396			if (my $typeProvider = $self->{meta}->{$descent}->{TypeProvider}) {
397			#print Dumper($map);
398			$classname = $map->{$typeProvider->{arg}};
399			# remove nodes from map also (push nodes to "subnodes_exclude" list)
400			push @exclude, $typeProvider->{arg};
401			}
402
403			# exclude banned properties (remove from map)
404			#map { delete $self->{node}->{map}->{$_} } @{$self->{args}->{exclude}};
405			map { delete $map->{$_} } @exclude;
406
407			# list of properties
408			my @props = keys %{$map};
409
410			# transfer data
411			if (lc $action eq 'insert') {
412
413			# make the object persistent in four steps:
414			# - raw create (perl / class tangram scope)
415			# - orm insert (tangram scope) ... this establishes inheritance - don't try to fill in inherited properties before!
416			# is this a Tangram bug?
417			# - raw fill-in from hash (perl scope)
418			# - orm update (tangram scope) ... this updates all properties just filled in
419
420
421			# ==========================
422			# TODO: REVIEW HERE!!!
423			# can't we achieve this more elegant?
424			# o use DesignPattern::Object???
425			# o use Hash::Merge!!! (take care about the cloning behaviour)
426
427			# check if object exists (is classname a valid perl package/module?)
428
429			# we can just check if the classname is valid here
430			if (!$classname) {
431			$logger->critical( __PACKAGE__ . "->_modifyNode: classname is undefined" );
432			# FIXME: stop syncing here?
433			return;
434			}
435
436			# try to match against the classes known by Class::Tangram
437			# FIXME: do "/i" on win32 only!
438			my $classname_find = quotemeta($classname);
439			if (!grep(m/$classname_find/i, Class::Tangram::known_classes())) {
440			$logger->critical( __PACKAGE__ . "->_modifyNode: Classname '$classname' is not known by Class::Tangram" );
441			# FIXME: stop syncing here?
442			return;
443			}
444
445			# create new object ...
446			# V1
447			# build array to initialize object
448			#my @initarray = ();
449			#map { push @initarray, $_, undef; } @props;
450			#my $object = $classname->new( @initarray );
451			# V2
452			$object = $classname->new();
453			# V3
454			# $object = DesignPattern::Object->new($data);
455
456			# ... pass to orm first ...
457			$self->{meta}->{$descent}->{storage}->insert($object);
458
459			# ... and initialize with empty (undef'd) properties afterwards.
460			map { $object->{$_} = undef; } @props;
461
462			# trace
463			#print "\n";
464			#print Dumper($map);
465			#print Dumper($object);
466			#exit;
467
468			# mix in (merge) values ...
469			# TODO: use Hash::Merge here? benchmark!
470			# no! we'd need a Object::Merge here! it's ...2object
471			hash2object($object, $map);
472
473			# trace
474			#print Dumper($object);
475			#exit;
476
477			# TODO: REVIEW HERE!!!
478			# ==========================
479
480			# ... and re-update@orm.
481			$self->{meta}->{$descent}->{storage}->update($object);
482
483			# asymmetry: get ident after insert
484			# TODO:
485			# - just do this if it is an IdentAuthority
486			# - use IdentProvider metadata here
487			#print Dumper($self->{meta}->{$descent});
488			my $oid = $self->{meta}->{$descent}->{storage}->id($object);
489			#print "oid: $oid", "\n";
490			$self->{node}->{$descent}->{ident} = $oid;
491
492
493			} elsif (lc $action eq 'update') {
494
495			# get fresh object from orm first
496			$object = $self->{meta}->{$descent}->{storage}->load($self->{node}->{$descent}->{ident});
497
498			#print Dumper($self->{node});
499
500			# mix in values
501			#print Dumper($object);
502			# TODO: use Hash::Merge here???
503			hash2object($object, $map);
504			#print Dumper($object);
505			#exit;
506
507			# update orm
508			$self->{meta}->{$descent}->{storage}->update($object);
509
510			}
511
512			#exit;
513
514			my $error = 0;
515
516			# handle new style callbacks - this is a HACK - do this without an eval!
517			#print Dumper($map);
518			#print "cb: ", Dumper($self->{meta}->{$descent}->{Callback});
519			#print Dumper($map_callbacks);
520			foreach my $node (keys %{$map_callbacks->{write}}) {
521			#print Dumper($node);
522	joko	1.4
523			# ------------ half-redundant: make $self->callCallback($object, $value, $opts)
524			my $perl_callback = $self->{meta}->{$descent}->{nodeType} . '::' . $node . '_write';
525	joko	1.2	my $evalstring = $perl_callback . '( { object => $object, value => $map_callbacks->{write}->{$node}, storage => $self->{meta}->{$descent}->{storage} } );';
526			#print $evalstring, "\n"; exit;
527			eval($evalstring);
528			if ($@) {
529			$error = 1;
530	joko	1.4	$logger->error( __PACKAGE__ . "->_modifyNode: $@" );
531			next;
532	joko	1.2	}
533	joko	1.4	# ------------ half-redundant: make $self->callCallback($object, $value, $opts)
534	joko	1.2
535			#print "after eval", "\n";
536
537			if (!$error) {
538			# re-update@orm
539			$self->{meta}->{$descent}->{storage}->update($object);
540			}
541			}
542
543			# handle errors
544			if ($error) {
545			#print "error", "\n";
546			=pod
547			my $sqlHandle;
548			#if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; }
549			$self->{node}->{status}->{error} = {
550			statement => $sql_main,
551			state => $sqlHandle->state,
552			err => $sqlHandle->err,
553			errstr => $sqlHandle->errstr,
554			};
555			=cut
556			# rollback....
557			#print "rollback", "\n";
558			$self->{meta}->{$descent}->{storage}->erase($object);
559			#print "after rollback", "\n";
560			} else {
561			$self->{node}->{status}->{ok} = 1;
562			}
563
564			}
565
566	joko	1.1	}
567
568	joko	1.4	sub _erase_all {
569			my $self = shift;
570			my $descent = shift;
571			#my $node = shift;
572			#print Dumper($self->{meta}->{$descent});
573			#my $node = $self->{meta}->{$descent}->{nodeName};
574			my $node = $self->{meta}->{$descent}->{accessorName};
575			$logger->debug( __PACKAGE__ . "->_erase_all( node $node )" );
576			$self->{meta}->{$descent}->{storage}->eraseAll($node);
577			}
578	joko	1.1
579			1;
580	joko	1.4	__END__
MailToCvsAdmin">MailToCvsAdmin	ViewVC Help
Powered by ViewVC 1.1.26