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## $Id: StorageInterface.pm,v 1.8 2003/04/09 07:27:02 joko Exp $ |
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## |
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## Copyright (c) 2002 Andreas Motl <andreas.motl@ilo.de> |
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## |
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## See COPYRIGHT section in pod text below for usage and distribution rights. |
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## |
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## ---------------------------------------------------------------------------------------- |
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## $Log: StorageInterface.pm,v $ |
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## Revision 1.8 2003/04/09 07:27:02 joko |
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## minor update (just cosmetics) |
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## |
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## Revision 1.7 2003/03/27 15:31:16 joko |
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## fixes to modules regarding new namespace(s) below Data::Mungle::* |
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## |
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## Revision 1.6 2003/02/21 01:47:53 joko |
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## renamed core function |
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## |
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## Revision 1.5 2003/02/20 20:24:33 joko |
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## + additional pre-flight checks |
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## |
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## Revision 1.4 2003/02/14 14:14:38 joko |
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## + new code refactored here |
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## |
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## Revision 1.3 2003/02/11 07:54:55 joko |
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## + modified module usage |
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## + debugging trials |
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## |
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## Revision 1.2 2003/02/09 05:05:58 joko |
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## + major structure changes |
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## - refactored code to sister modules |
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## + refactored code to this place |
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## |
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## Revision 1.1 2003/01/20 16:58:46 joko |
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## + initial check-in: here they are.... |
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## |
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## Revision 1.1 2003/01/19 01:23:04 joko |
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## + new from Data/Transfer/Sync.pm |
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## |
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## ---------------------------------------------------------------------------------------- |
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|
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|
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package Data::Transfer::Sync::StorageInterface; |
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|
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use strict; |
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use warnings; |
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|
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use mixin::with qw( Data::Transfer::Sync ); |
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|
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|
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# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - main |
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|
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use Data::Dumper; |
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use Hash::Merge qw( merge ); |
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use shortcuts::database qw( hash2sql ); |
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use Data::Mungle::Transform::Deep qw( merge_to ); |
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|
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|
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# get logger instance |
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my $logger = Log::Dispatch::Config->instance; |
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|
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# this is a shortcut method |
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# ... let's try to avoid _any_ redundant code in here (ok... - at the cost of method lookups...) |
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sub _getNodeList { |
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my $self = shift; |
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my $descent = shift; |
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my $filter = shift; |
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$logger->debug( __PACKAGE__ . "->_getNodeList( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" ); |
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#$results ||= $self->{source}->getListUnfiltered($self->{meta}->{source}->{node}); |
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#$results ||= $self->{meta}->{source}->{storage}->getListUnfiltered($self->{meta}->{source}->{node}); |
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my $list = $self->{meta}->{$descent}->{storage}->getListFiltered($self->{meta}->{$descent}->{accessorName}, $filter); |
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#print Dumper($list); |
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return $list; |
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} |
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|
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sub _resolveNodeIdent { |
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my $self = shift; |
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my $descent = shift; |
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|
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# trace |
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#print Dumper($self->{node}->{$descent}); |
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#print Dumper($self); |
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#exit; |
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|
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$logger->debug( __PACKAGE__ . "->_resolveNodeIdent( descent=$descent, accessorName=$self->{meta}->{$descent}->{accessorName} )" ); |
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|
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# get to the payload |
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#my $item = $specifier->{item}; |
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my $payload = $self->{node}->{$descent}->{payload}; |
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|
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# resolve method to get to the id of the given item |
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# we use global metadata and the given descent for this task |
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#my $ident = $self->{$descent}->id($item); |
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#my $ident = $self->{meta}->{$descent}->{storage}->id($item); |
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|
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# trace |
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#print Dumper($self->{meta}->{$descent}); |
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#exit; |
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|
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my $ident; |
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my $provider_method = $self->{meta}->{$descent}->{IdentProvider}->{method}; |
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my $provider_arg = $self->{meta}->{$descent}->{IdentProvider}->{arg}; |
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|
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# trace |
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#print "provider_method: $provider_method", "\n"; |
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#print "provider_arg: $provider_arg", "\n"; |
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#print Dumper($payload); |
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|
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# resolve to ident |
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if (lc $provider_method eq 'property') { |
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$ident = $payload->{$provider_arg}; |
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|
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} elsif (lc $provider_method eq 'storage_method') { |
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#$ident = $self->{meta}->{$descent}->{storage}->id($item); |
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$ident = $self->{meta}->{$descent}->{storage}->$provider_arg($payload); |
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|
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} elsif (lc $provider_method eq 'code') { |
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$ident = 'ac'; |
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|
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} |
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|
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$self->{node}->{$descent}->{ident} = $ident; |
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|
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return 1 if $ident; |
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|
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} |
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|
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# TODO: |
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# this should be split up into... |
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# - a "_statNode" (should just touch the node to check for existance) |
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# - a "_loadNode" (should load node completely) |
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# - maybe additionally a "loadNodeProperty" (may specify properties to load) |
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# - introduce $self->{nodecache} for this purpose |
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# TODO: |
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# should we: |
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# - not pass ident in here but resolve it via "$descent"? |
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# - refactor this and stuff it with additional debug/error message |
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# - this = the way the implicit load mechanism works |
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sub _statloadNode { |
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|
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my $self = shift; |
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my $descent = shift; |
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my $ident = shift; |
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my $force = shift; |
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|
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=pod |
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#print "isa: ", UNIVERSAL::isa($self->{meta}->{$descent}->{storage}), "\n"; |
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|
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# this seems to be the first time we access this side, |
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# so just check (again) for a valid storage handle |
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if (! ref $self->{meta}->{$descent}->{storage}) { |
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$logger->critical( __PACKAGE__ . "->_statloadNode( descent=$descent ident=$ident ): Storage handle undefined!" ); |
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return; |
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} |
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=cut |
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|
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#$logger->debug( __PACKAGE__ . "->_statloadNode( descent=$descent ident=$ident )" ); |
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|
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# fetch entry to retrieve checksum from |
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# was: |
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if (!$self->{node}->{$descent} || $force) { |
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# is: |
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#if (!$self->{node}->{$descent}->{item} || $force) { |
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|
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if (!$ident) { |
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#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"; |
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return; |
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} |
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|
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# patch for DBD::CSV |
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if ($ident && $ident eq 'Null') { |
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return; |
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} |
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|
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#print Dumper($self->{meta}); |
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|
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my $query = { |
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node => $self->{meta}->{$descent}->{accessorName}, |
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subnodes => [qw( cs )], |
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criterias => [ |
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{ key => $self->{meta}->{$descent}->{IdentProvider}->{arg}, |
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op => 'eq', |
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val => $ident }, |
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] |
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}; |
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|
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# send query and fetch first entry from result |
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my $result = $self->{meta}->{$descent}->{storage}->sendQuery($query); |
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my $entry = $result->getNextEntry(); |
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|
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# trace |
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#print Dumper($entry); |
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#print "pers: " . $self->{meta}->{$descent}->{storage}->is_persistent($entry), "\n"; |
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#my $state = $self->{meta}->{$descent}->{storage}->_fetch_object_state($entry, { name => 'TransactionHop' } ); |
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#print Dumper($state); |
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|
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# be informed about the status of the query |
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my $status = $result->getStatus(); |
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|
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#print Dumper($status); |
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|
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# TODO: enhance error handling (store inside tc) |
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#if (!$row) { |
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# print "\n", "row error", "\n"; |
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# next; |
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#} |
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|
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# these checks run before actually loading payload- and meta-data to node-container |
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|
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# 1st level - hard error |
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if ($status && $status->{err}) { |
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$logger->debug( __PACKAGE__ . "->_statloadNode (ident=\"$ident\") failed - hard error (that's ok): $status->{err}" ); |
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return; |
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} |
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|
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# 2nd level - logical (empty/notfound) error |
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if (($status && $status->{empty}) || !$entry) { |
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$logger->debug( __PACKAGE__ . "->_statloadNode (ident=\"$ident\") failed - logical error (that's ok)" ); |
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#print "no entry (logical)", "\n"; |
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return; |
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} |
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|
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#print Dumper($entry); |
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|
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# was: |
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# $self->{node}->{$descent}->{ident} = $ident; |
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# is: |
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# TODO: re-resolve ident from entry via metadata "IdentProvider" here - like elsewhere |
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$self->{node}->{$descent}->{ident} = $ident; |
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$self->{node}->{$descent}->{payload} = $entry; |
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|
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} |
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|
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return 1; |
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|
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} |
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|
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|
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sub _touchNodeSet { |
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my $self = shift; |
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|
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$logger->debug( __PACKAGE__ . "->touchNodeSet" ); |
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|
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# check descents/nodes: does descent exist / is node available? |
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foreach my $descent (keys %{$self->{meta}}) { |
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|
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# 1. check metadata of descent(s) |
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if (!$self->{meta}->{$descent}) { |
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$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not find descent '$descent' in configuration metadata." ); |
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next; |
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} |
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|
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# 2. check storage handle(s) |
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my $dbkey = $self->{meta}->{$descent}->{dbKey}; |
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if (!$self->{meta}->{$descent}->{storage}) { |
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$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not access storage ( descent='$descent', dbKey='$dbkey' ) - configuration-error?" ); |
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next; |
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} |
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|
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# 2.b check storage handle type |
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my $dbType = $self->{meta}->{$descent}->{storage}->{locator}->{type}; |
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if (!$dbType) { |
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$logger->critical( __PACKAGE__ . "->touchNodeSet: Storage ( descent='$descent', dbKey='$dbkey' ) has no 'dbType' - configuration-error?" ); |
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next; |
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} |
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|
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# 3. check if descents (and nodes?) are actually available.... |
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# TODO: |
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# eventually pre-check mode of access-attempt (read/write) here to provide an "early-croak" if possible |
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|
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# trace |
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# print Dumper($self->{meta}->{$descent}->{storage}->{locator}); |
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|
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|
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my $nodeName = $self->{meta}->{$descent}->{nodeName}; |
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my $accessorType = $self->{meta}->{$descent}->{accessorType}; |
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my $accessorName = $self->{meta}->{$descent}->{accessorName}; |
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|
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|
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# 4. check nodeset |
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|
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# debug message containing database type and used/determined accessor name |
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$logger->debug( __PACKAGE__ . "->touchNodeSet: Accessing dbType=$dbType, accessorName=$accessorName" ); |
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|
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# if target node(s) do(es) not exist, check if we should create it automagically |
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if ($dbType ne 'DBI' && !$self->{meta}->{$descent}->{storage}->existsChildNode($accessorName)) { |
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|
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if ($descent eq 'target' && $self->{options}->{target}->{autocreateFolders}) { |
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if (!$self->{meta}->{$descent}->{storage}->createChildNode($accessorName)) { |
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$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not create node '$self->{meta}->{$descent}->{nodeName}\@$self->{meta}->{$descent}->{dbKey}' [$self->{meta}->{$descent}->{nodeType}]." ); |
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next; |
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} |
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} else { |
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$logger->critical( __PACKAGE__ . "->touchNodeSet: Could not reach node \"$nodeName\" (accessorName=$accessorName, accessorType=$accessorType) at descent \"$descent\"" ); |
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next; |
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} |
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} |
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|
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} |
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|
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# trace |
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#print Dumper($self->{meta}); |
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#exit; |
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|
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|
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return 1; |
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|
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} |
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|
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|
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|
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sub _modifyNode { |
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my $self = shift; |
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my $descent = shift; |
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my $action = shift; |
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my $map = shift; |
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my $crit = shift; |
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|
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# map for new style callbacks |
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my $map_callbacks = {}; |
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|
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# checks go first! |
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|
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# TODO: this should be reviewed first - before extending ;-) |
| 324 |
# TODO: this should be extended: |
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# count this cases inside the caller to this sub and provide a better overall message |
| 326 |
# if this counts still zero in the end: |
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# "No nodes have been touched for modify: Do you have column-headers in your csv file?" |
| 328 |
if (not defined $self->{node}) { |
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#$logger->critical( __PACKAGE__ . "->_modifyNode failed: \"$descent\" node is empty." ); |
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#return; |
| 331 |
} |
| 332 |
|
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# transfer callback nodes from value map to callback map - handle them afterwards! - (new style callbacks) |
| 334 |
if (my $callbacks = $self->{meta}->{$descent}->{Callback}) { |
| 335 |
foreach my $callback (keys %{$callbacks->{write}}) { |
| 336 |
$map_callbacks->{write}->{$callback} = $map->{$callback}; |
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delete $map->{$callback}; |
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} |
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} |
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|
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|
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# trace |
| 343 |
#print Dumper($self->{meta}); |
| 344 |
|
| 345 |
|
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# -------------------------------------------------------------------------- |
| 347 |
# DBI speaks SQL |
| 348 |
if ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'DBI') { |
| 349 |
|
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# trace |
| 351 |
#print Dumper($map); |
| 352 |
#delete $map->{cs}; |
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|
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# transfer data |
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# TODO: wrap this around '$storageHandle->sendQuery(...)'!? |
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my $sql_main; |
| 357 |
if (lc($action) eq 'insert') { |
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$sql_main = hash2sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_INSERT'); |
| 359 |
} elsif (lc $action eq 'update') { |
| 360 |
$crit ||= "$self->{meta}->{$descent}->{IdentProvider}->{arg}='$self->{node}->{$descent}->{ident}'"; |
| 361 |
$sql_main = hash2sql($self->{meta}->{$descent}->{accessorName}, $map, 'SQL_UPDATE', $crit); |
| 362 |
} |
| 363 |
my $sqlHandle = $self->{meta}->{$descent}->{storage}->sendCommand($sql_main); |
| 364 |
|
| 365 |
# handle errors |
| 366 |
if ($sqlHandle->err) { |
| 367 |
#if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; } |
| 368 |
$self->{node}->{status}->{error} = { |
| 369 |
statement => $sql_main, |
| 370 |
state => $sqlHandle->state, |
| 371 |
err => $sqlHandle->err, |
| 372 |
errstr => $sqlHandle->errstr, |
| 373 |
}; |
| 374 |
} else { |
| 375 |
$self->{node}->{status}->{ok} = 1; |
| 376 |
} |
| 377 |
|
| 378 |
|
| 379 |
# -------------------------------------------------------------------------- |
| 380 |
# Tangram does it the oo-way (naturally) |
| 381 |
} elsif ($self->{meta}->{$descent}->{storage}->{locator}->{type} eq 'Tangram') { |
| 382 |
my $sql_main; |
| 383 |
my $object; |
| 384 |
|
| 385 |
# determine classname |
| 386 |
my $classname = $self->{meta}->{$descent}->{nodeType}; |
| 387 |
|
| 388 |
# attributes/properties to exclude |
| 389 |
# push declared ones from metadata |
| 390 |
my @exclude = @{$self->{meta}->{$descent}->{subnodes_exclude}}; |
| 391 |
# push the attributes associated with the identifier |
| 392 |
if (my $identProvider = $self->{meta}->{$descent}->{IdentProvider}) { |
| 393 |
push @exclude, $identProvider->{arg}; |
| 394 |
} |
| 395 |
|
| 396 |
# trace |
| 397 |
#print Dumper($self->{meta}); |
| 398 |
#exit; |
| 399 |
|
| 400 |
# new feature: |
| 401 |
# - check TypeProvider metadata property from other side |
| 402 |
# - use argument (arg) inside as a classname for object creation on this side |
| 403 |
#my $otherSide = $self->_otherSide($descent); |
| 404 |
if (my $typeProvider = $self->{meta}->{$descent}->{TypeProvider}) { |
| 405 |
#print Dumper($map); |
| 406 |
$classname = $map->{$typeProvider->{arg}}; |
| 407 |
# remove nodes from map also (push nodes to "subnodes_exclude" list) |
| 408 |
push @exclude, $typeProvider->{arg}; |
| 409 |
} |
| 410 |
|
| 411 |
# exclude banned properties (remove from map) |
| 412 |
#map { delete $self->{node}->{map}->{$_} } @{$self->{args}->{exclude}}; |
| 413 |
map { delete $map->{$_} } @exclude; |
| 414 |
|
| 415 |
# list of properties |
| 416 |
my @props = keys %{$map}; |
| 417 |
|
| 418 |
# transfer data |
| 419 |
if (lc $action eq 'insert') { |
| 420 |
|
| 421 |
# make the object persistent in four steps: |
| 422 |
# - raw create (perl / class tangram scope) |
| 423 |
# - orm insert (tangram scope) ... this establishes inheritance - don't try to fill in inherited properties before! |
| 424 |
# is this a Tangram bug? |
| 425 |
# - raw fill-in from hash (perl scope) |
| 426 |
# - orm update (tangram scope) ... this updates all properties just filled in |
| 427 |
|
| 428 |
|
| 429 |
# ========================== |
| 430 |
# TODO: REVIEW HERE!!! |
| 431 |
# can't we achieve this more elegant? |
| 432 |
# o use DesignPattern::Object??? |
| 433 |
# o use Hash::Merge!!! (take care about the cloning behaviour) |
| 434 |
|
| 435 |
# check if object exists (is classname a valid perl package/module?) |
| 436 |
|
| 437 |
# we can just check if the classname is valid here |
| 438 |
if (!$classname) { |
| 439 |
$logger->critical( __PACKAGE__ . "->_modifyNode: classname is undefined" ); |
| 440 |
# FIXME: stop syncing here? |
| 441 |
return; |
| 442 |
} |
| 443 |
|
| 444 |
# try to match against the classes known by Class::Tangram |
| 445 |
# FIXME: do "/i" on win32 only! |
| 446 |
my $classname_find = quotemeta($classname); |
| 447 |
if (!grep(m/$classname_find/i, Class::Tangram::known_classes())) { |
| 448 |
$logger->critical( __PACKAGE__ . "->_modifyNode: Classname '$classname' is not known by Class::Tangram" ); |
| 449 |
# FIXME: stop syncing here? |
| 450 |
return; |
| 451 |
} |
| 452 |
|
| 453 |
# create new object ... |
| 454 |
# V1 |
| 455 |
# build array to initialize object |
| 456 |
#my @initarray = (); |
| 457 |
#map { push @initarray, $_, undef; } @props; |
| 458 |
#my $object = $classname->new( @initarray ); |
| 459 |
# V2 |
| 460 |
$object = $classname->new(); |
| 461 |
# V3 |
| 462 |
# $object = DesignPattern::Object->new($data); |
| 463 |
|
| 464 |
# ... pass to orm first ... |
| 465 |
$self->{meta}->{$descent}->{storage}->insert($object); |
| 466 |
|
| 467 |
# ... and initialize with empty (undef'd) properties afterwards. |
| 468 |
map { $object->{$_} = undef; } @props; |
| 469 |
|
| 470 |
# trace |
| 471 |
#print "\n"; |
| 472 |
#print Dumper($map); |
| 473 |
#print Dumper($object); |
| 474 |
#exit; |
| 475 |
|
| 476 |
# mix in (merge) values ... |
| 477 |
# TODO: use Hash::Merge here? benchmark! |
| 478 |
# no! we'd need a Object::Merge here! it's *...2object* |
| 479 |
merge_to($object, $map); |
| 480 |
|
| 481 |
# trace |
| 482 |
#print Dumper($object); |
| 483 |
#exit; |
| 484 |
|
| 485 |
# TODO: REVIEW HERE!!! |
| 486 |
# ========================== |
| 487 |
|
| 488 |
# ... and re-update@orm. |
| 489 |
$self->{meta}->{$descent}->{storage}->update($object); |
| 490 |
|
| 491 |
# asymmetry: get ident after insert |
| 492 |
# TODO: |
| 493 |
# - just do this if it is an IdentAuthority |
| 494 |
# - use IdentProvider metadata here |
| 495 |
#print Dumper($self->{meta}->{$descent}); |
| 496 |
my $oid = $self->{meta}->{$descent}->{storage}->id($object); |
| 497 |
#print "oid: $oid", "\n"; |
| 498 |
$self->{node}->{$descent}->{ident} = $oid; |
| 499 |
|
| 500 |
|
| 501 |
} elsif (lc $action eq 'update') { |
| 502 |
|
| 503 |
# Get fresh object from orm first. |
| 504 |
# TODO: Review, is a 'sendQuery' required in this place? |
| 505 |
# By now: NO! It's more expensive and we can just expect existing objects for update operations. |
| 506 |
# If it doesn't exist either, we assume the engine will fail on issuing the 'update' operation later... |
| 507 |
$object = $self->{meta}->{$descent}->{storage}->load($self->{node}->{$descent}->{ident}); |
| 508 |
|
| 509 |
# mix in values |
| 510 |
merge_to($object, $map); |
| 511 |
|
| 512 |
# update orm |
| 513 |
$self->{meta}->{$descent}->{storage}->update($object); |
| 514 |
|
| 515 |
} |
| 516 |
|
| 517 |
my $error = 0; |
| 518 |
|
| 519 |
# handle new style callbacks - this is a HACK - do this without an eval! |
| 520 |
#print Dumper($map); |
| 521 |
#print "cb: ", Dumper($self->{meta}->{$descent}->{Callback}); |
| 522 |
#print Dumper($map_callbacks); |
| 523 |
foreach my $node (keys %{$map_callbacks->{write}}) { |
| 524 |
#print Dumper($node); |
| 525 |
|
| 526 |
# ------------ half-redundant: make $self->callCallback($object, $value, $opts) |
| 527 |
my $perl_callback = $self->{meta}->{$descent}->{nodeType} . '::' . $node . '_write'; |
| 528 |
my $evalstring = $perl_callback . '( { object => $object, value => $map_callbacks->{write}->{$node}, storage => $self->{meta}->{$descent}->{storage} } );'; |
| 529 |
#print $evalstring, "\n"; exit; |
| 530 |
eval($evalstring); |
| 531 |
if ($@) { |
| 532 |
$error = 1; |
| 533 |
$logger->error( __PACKAGE__ . "->_modifyNode: $@" ); |
| 534 |
next; |
| 535 |
} |
| 536 |
# ------------ half-redundant: make $self->callCallback($object, $value, $opts) |
| 537 |
|
| 538 |
#print "after eval", "\n"; |
| 539 |
|
| 540 |
if (!$error) { |
| 541 |
# re-update@orm |
| 542 |
$self->{meta}->{$descent}->{storage}->update($object); |
| 543 |
} |
| 544 |
} |
| 545 |
|
| 546 |
# handle errors |
| 547 |
if ($error) { |
| 548 |
#print "error", "\n"; |
| 549 |
=pod |
| 550 |
my $sqlHandle; |
| 551 |
#if ($self->{args}->{debug}) { print "sql-error with statement: $sql_main", "\n"; } |
| 552 |
$self->{node}->{status}->{error} = { |
| 553 |
statement => $sql_main, |
| 554 |
state => $sqlHandle->state, |
| 555 |
err => $sqlHandle->err, |
| 556 |
errstr => $sqlHandle->errstr, |
| 557 |
}; |
| 558 |
=cut |
| 559 |
# rollback.... |
| 560 |
#print "rollback", "\n"; |
| 561 |
$self->{meta}->{$descent}->{storage}->erase($object); |
| 562 |
#print "after rollback", "\n"; |
| 563 |
} else { |
| 564 |
$self->{node}->{status}->{ok} = 1; |
| 565 |
} |
| 566 |
|
| 567 |
} |
| 568 |
|
| 569 |
} |
| 570 |
|
| 571 |
sub _erase_all { |
| 572 |
my $self = shift; |
| 573 |
my $descent = shift; |
| 574 |
#my $node = shift; |
| 575 |
#print Dumper($self->{meta}->{$descent}); |
| 576 |
#my $node = $self->{meta}->{$descent}->{nodeName}; |
| 577 |
my $node = $self->{meta}->{$descent}->{accessorName}; |
| 578 |
$logger->debug( __PACKAGE__ . "->_erase_all( node $node )" ); |
| 579 |
$self->{meta}->{$descent}->{storage}->eraseAll($node); |
| 580 |
} |
| 581 |
|
| 582 |
1; |
| 583 |
__END__ |
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