--- nfo/perl/libs/Data/README.text 2002/11/09 01:05:20 1.3 +++ nfo/perl/libs/Data/README.text 2002/11/29 04:48:23 1.4 @@ -2,8 +2,17 @@ Data::Storage - Interface for accessing various Storage implementations for Perl in an independent way +AIMS + - should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary (more convenient) way ;) + - introduce a generic layered structure, refactor *SUBLAYER*-stuff, make (e.g.) this possible: + Perl Data::Storage[DBD::CSV] -> Perl LWP:: -> Internet HTTP/FTP/* -> Host Daemon -> csv-file + - provide generic synchronization mechanisms across arbitrary/multiple storages based on ident/checksum + maybe it's possible to have schema-, structural- and semantical modifications synchronized??? + SYNOPSIS - ... the basic way: + BASIC ACCESS + + ADVANCED ACCESS ... via inheritance: @@ -20,6 +29,83 @@ ); $self->{storage}->insert($proxyObj); + SYNCHRONIZATION + + my $nodemapping = { + 'LangText' => 'langtexts.csv', + 'Currency' => 'currencies.csv', + 'Country' => 'countries.csv', + }; + + my $propmapping = { + 'LangText' => [ + [ 'source:lcountrykey' => 'target:country' ], + [ 'source:lkey' => 'target:key' ], + [ 'source:lvalue' => 'target:text' ], + ], + 'Currency' => [ + [ 'source:ckey' => 'target:key' ], + [ 'source:cname' => 'target:text' ], + ], + 'Country' => [ + [ 'source:ckey' => 'target:key' ], + [ 'source:cname' => 'target:text' ], + ], + }; + + sub syncResource { + + my $self = shift; + my $node_source = shift; + my $mode = shift; + my $opts = shift; + + $mode ||= ''; + $opts->{erase} ||= 0; + + $logger->info( __PACKAGE__ . "->syncResource( node_source $node_source mode $mode erase $opts->{erase} )"); + + # resolve metadata for syncing requested resource + my $node_target = $nodemapping->{$node_source}; + my $mapping = $propmapping->{$node_source}; + + if (!$node_target || !$mapping) { + # loggger.... "no target, sorry!" + print "error while resolving resource metadata", "\n"; + return; + } + + if ($opts->{erase}) { + $self->_erase_all($node_source); + } + + # create new sync object + my $sync = Data::Transfer::Sync->new( + storages => { + L => $self->{bizWorks}->{backend}, + R => $self->{bizWorks}->{resources}, + }, + id_authorities => [qw( L ) ], + checksum_authorities => [qw( L ) ], + write_protected => [qw( R ) ], + verbose => 1, + ); + + # sync + # todo: filter!? + $sync->syncNodes( { + direction => $mode, # | +PUSH | +PULL | -FULL | +IMPORT | -EXPORT + method => 'checksum', # | -timestamp | -manual + source => "L:$node_source", + source_ident => 'storage_method:id', + source_exclude => [qw( id cs )], + target => "R:$node_target", + target_ident => 'property:oid', + mapping => $mapping, + } ); + + } + NOTE This module heavily relies on DBI and Tangram, but adds a lot of @@ -27,12 +113,18 @@ this code for additional information. REQUIREMENTS - For full functionality: DBI from CPAN Tangram from CPAN Class::Tangram - from CPAN MySQL::Diff from http://adamspiers.org/computing/mysqldiff/ - ... and all their dependencies + For full functionality: + DBI from CPAN + DBD::mysql from CPAN + Tangram 2.04 from CPAN (hmmm, 2.04 won't do in some cases) + Tangram 2.05 from http://... (2.05 seems okay but there are also additional patches from our side) + Class::Tangram from CPAN + DBD::CSV from CPAN + MySQL::Diff from http://adamspiers.org/computing/mysqldiff/ + ... and all their dependencies DESCRIPTION - Data::Storage is module for a accessing various "data structures" stored + Data::Storage is a module for accessing various "data structures" stored inside various "data containers". It sits on top of DBI and/or Tangram. AUTHORS / COPYRIGHT @@ -44,24 +136,26 @@ ACKNOWLEDGEMENTS Larry Wall for Perl, Tim Bunce for DBI, Jean-Louis Leroy for Tangram and - Set::Object, Sam Vilain for Class::Tangram, Adam Spiers for MySQL::Diff - and all contributors. + Set::Object, Sam Vilain for Class::Tangram, Jochen Wiedmann and Jeff + Zucker for DBD::CSV and related, Adam Spiers for MySQL::Diff and all + contributors. SUPPORT / WARRANTY Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND. TODO - Handle the following errors/cases: + BUGS - "DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'" + "DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column + 't1.requestdump' in 'field list'" - ... occours when operating on object-attributes not introduced yet: - this should be detected and appended/replaced through: - "Schema-Error detected, maybe (just) an inconsistency. - Please check if your declaration in schema-module "a" matches structure in database "b" or try to run" - db_setup.pl --dbkey=import --action=deploy + ... occours when operating on object-attributes not introduced yet: + this should be detected and appended/replaced through: + "Schema-Error detected, maybe (just) an inconsistency. + Please check if your declaration in schema-module "a" matches structure in database "b" or try to run" + db_setup.pl --dbkey=import --action=deploy - Compare schema (structure diff) with database ... + Compare schema (structure diff) with database ... ... when issuing "db_setup.pl --dbkey=import --action=deploy" on a database with an already deployed schema, use an additional "--update" then @@ -89,7 +183,7 @@ As we can see, creations of Classes and new Class variables is handled automatically and this is believed to be the most common case under normal circumstances. - Introduce some features: + FEATURES - Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG. - Make it possible to load/save schemas in XMI (XML Metadata Interchange), @@ -97,13 +191,25 @@ Integrate/bundle this with a web-/html-based UML modeling tool or some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based) - Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers. - - Add some more handlers: - - look at DBD::CSV, Text::CSV, XML::CSV, XML::Excel - - Add some more locations/locators: - - PerlDAV: http://www.webdav.org/perldav/ - - Move to t3, use InCASE + - Add support for some more handlers/locators to be able to + access the following standards/protocols/interfaces/programs/apis transparently: + + DBD::CSV (via Data::Storage::Handler::DBI) + (-) Text::CSV, XML::CSV, XML::Excel + - MAPI + - LDAP + - DAV (look at PerlDAV: http://www.webdav.org/perldav/) + - Mbox (use formail for seperating/splitting entries/nodes) + - Cyrus (cyrdeliver - what about cyrretrieve (export)???) + - use File::DiffTree, use File::Compare + - Hibernate + - "Win32::UserAccountDb" + - "*nix::UserAccountDb" + - .wab - files (Windows Address Book) + - .pst - files (Outlook Post Storage?) + - XML (e.g. via XML::Simple?) + - Move to t3, look at InCASE - Links: + LINKS / REFERENCES Specs: UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf