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NAME |
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Data::Storage - Interface for accessing various Storage implementations |
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for Perl in an independent way |
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|
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AIMS |
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- should encapsulate Tangram, DBI, DBD::CSV and LWP:: to access them in an unordinary (more convenient) way ;) |
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- introduce a generic layered structure, refactor *SUBLAYER*-stuff, make (e.g.) this possible: |
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Perl Data::Storage[DBD::CSV] -> Perl LWP:: -> Internet HTTP/FTP/* -> Host Daemon -> csv-file |
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- provide generic synchronization mechanisms across arbitrary/multiple storages based on ident/checksum |
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maybe it's possible to have schema-, structural- and semantical modifications synchronized??? |
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|
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SYNOPSIS |
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BASIC ACCESS |
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|
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ADVANCED ACCESS |
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|
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... via inheritance: |
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|
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use Data::Storage; |
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my $proxyObj = new HttpProxy; |
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$proxyObj->{url} = $url; |
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$proxyObj->{payload} = $content; |
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$self->{storage}->insert($proxyObj); |
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|
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use Data::Storage; |
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my $proxyObj = HttpProxy->new( |
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url => $url, |
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payload => $content, |
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); |
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$self->{storage}->insert($proxyObj); |
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|
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SYNCHRONIZATION |
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|
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my $nodemapping = { |
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'LangText' => 'langtexts.csv', |
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'Currency' => 'currencies.csv', |
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'Country' => 'countries.csv', |
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}; |
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|
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my $propmapping = { |
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'LangText' => [ |
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[ 'source:lcountrykey' => 'target:country' ], |
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[ 'source:lkey' => 'target:key' ], |
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[ 'source:lvalue' => 'target:text' ], |
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], |
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'Currency' => [ |
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[ 'source:ckey' => 'target:key' ], |
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[ 'source:cname' => 'target:text' ], |
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], |
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'Country' => [ |
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[ 'source:ckey' => 'target:key' ], |
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[ 'source:cname' => 'target:text' ], |
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], |
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}; |
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|
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sub syncResource { |
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|
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my $self = shift; |
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my $node_source = shift; |
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my $mode = shift; |
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my $opts = shift; |
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|
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$mode ||= ''; |
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$opts->{erase} ||= 0; |
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|
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$logger->info( __PACKAGE__ . "->syncResource( node_source $node_source mode $mode erase $opts->{erase} )"); |
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|
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# resolve metadata for syncing requested resource |
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my $node_target = $nodemapping->{$node_source}; |
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my $mapping = $propmapping->{$node_source}; |
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|
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if (!$node_target || !$mapping) { |
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# loggger.... "no target, sorry!" |
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print "error while resolving resource metadata", "\n"; |
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return; |
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} |
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|
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if ($opts->{erase}) { |
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$self->_erase_all($node_source); |
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} |
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|
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# create new sync object |
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my $sync = Data::Transfer::Sync->new( |
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storages => { |
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L => $self->{bizWorks}->{backend}, |
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R => $self->{bizWorks}->{resources}, |
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}, |
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id_authorities => [qw( L ) ], |
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checksum_authorities => [qw( L ) ], |
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write_protected => [qw( R ) ], |
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verbose => 1, |
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); |
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|
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# sync |
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# todo: filter!? |
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$sync->syncNodes( { |
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direction => $mode, # | +PUSH | +PULL | -FULL | +IMPORT | -EXPORT |
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method => 'checksum', # | -timestamp | -manual |
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source => "L:$node_source", |
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source_ident => 'storage_method:id', |
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source_exclude => [qw( id cs )], |
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target => "R:$node_target", |
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target_ident => 'property:oid', |
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mapping => $mapping, |
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} ); |
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|
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} |
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|
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NOTE |
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|
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This module heavily relies on DBI and Tangram, but adds a lot of |
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additional bugs and quirks. Please look at their documentation and/or |
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this code for additional information. |
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|
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REQUIREMENTS |
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For full functionality: |
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DBI from CPAN |
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DBD::mysql from CPAN |
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Tangram 2.04 from CPAN (hmmm, 2.04 won't do in some cases) |
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Tangram 2.05 from http://... (2.05 seems okay but there are also additional patches from our side) |
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Class::Tangram from CPAN |
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DBD::CSV from CPAN |
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MySQL::Diff from http://adamspiers.org/computing/mysqldiff/ |
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... and all their dependencies |
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|
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DESCRIPTION |
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Data::Storage is a module for accessing various "data structures" stored |
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inside various "data containers". It sits on top of DBI and/or Tangram. |
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|
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AUTHORS / COPYRIGHT |
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The Data::Storage module is Copyright (c) 2002 Andreas Motl. All rights |
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reserved. |
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|
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You may distribute it under the terms of either the GNU General Public |
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License or the Artistic License, as specified in the Perl README file. |
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|
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ACKNOWLEDGEMENTS |
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Larry Wall for Perl, Tim Bunce for DBI, Jean-Louis Leroy for Tangram and |
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Set::Object, Sam Vilain for Class::Tangram, Jochen Wiedmann and Jeff |
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Zucker for DBD::CSV and related, Adam Spiers for MySQL::Diff and all |
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contributors. |
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|
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SUPPORT / WARRANTY |
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Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND. |
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|
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TODO |
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BUGS |
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|
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"DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column |
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't1.requestdump' in 'field list'" |
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|
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... occours when operating on object-attributes not introduced yet: |
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this should be detected and appended/replaced through: |
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"Schema-Error detected, maybe (just) an inconsistency. |
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Please check if your declaration in schema-module "a" matches structure in database "b" or try to run" |
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db_setup.pl --dbkey=import --action=deploy |
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|
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Compare schema (structure diff) with database ... |
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|
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... when issuing "db_setup.pl --dbkey=import --action=deploy" |
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on a database with an already deployed schema, use an additional "--update" then |
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to lift the schema inside the database to the current declared schema. |
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You will have to approve removals and changes on field-level while |
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new objects and new fields are introduced silently without any interaction needed. |
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In future versions there may be additional options to control silent processing of |
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removals and changes. |
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See this CRUD-table applying to the actions occouring on Classes and Class variables when deploying schemas, |
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don't mix this up with CRUD-actions on Objects, these are already handled by (e.g.) Tangram itself. |
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Classes: |
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C create -> yes, handled automatically |
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R retrieve -> no, not subject of this aspect since it is about deployment only |
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U update -> yes, automatically for Class meta-attributes, yes/no for Class variables (look at the rules down here) |
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D delete -> yes, just by user-interaction |
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Class variables: |
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C create -> yes, handled automatically |
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R retrieve -> no, not subject of this aspect since it is about deployment only |
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U update -> yes, just by user-interaction; maybe automatically if it can be determined that data wouldn't be lost |
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D delete -> yes, just by user-interaction |
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|
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It's all about not to be able to loose data simply while this is in pre-alpha stage. |
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And loosing data by being able to modify and redeploy schemas easily is definitely quite easy. |
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|
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As we can see, creations of Classes and new Class variables is handled |
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automatically and this is believed to be the most common case under normal circumstances. |
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|
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FEATURES |
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|
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- Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG. |
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- Make it possible to load/save schemas in XMI (XML Metadata Interchange), |
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which seems to be most commonly used today, perhaps handle objects with OIFML. |
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Integrate/bundle this with a web-/html-based UML modeling tool or |
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some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based) |
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- Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers. |
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- Add support for some more handlers/locators to be able to |
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access the following standards/protocols/interfaces/programs/apis transparently: |
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+ DBD::CSV (via Data::Storage::Handler::DBI) |
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(-) Text::CSV, XML::CSV, XML::Excel |
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- MAPI |
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- LDAP |
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- DAV (look at PerlDAV: http://www.webdav.org/perldav/) |
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- Mbox (use formail for seperating/splitting entries/nodes) |
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- Cyrus (cyrdeliver - what about cyrretrieve (export)???) |
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- use File::DiffTree, use File::Compare |
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- Hibernate |
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- "Win32::UserAccountDb" |
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- "*nix::UserAccountDb" |
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- .wab - files (Windows Address Book) |
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- .pst - files (Outlook Post Storage?) |
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- XML (e.g. via XML::Simple?) |
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- Move to t3, look at InCASE |
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|
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LINKS / REFERENCES |
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|
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Specs: |
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UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf |
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XMI 1.1 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf |
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XMI 2.0 Spec: http://cgi.omg.org/docs/ad/01-06-12.pdf |
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ODMG: http://odmg.org/ |
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OIFML: http://odmg.org/library/readingroom/oifml.pdf |
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|
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CASE Tools: |
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Rational Rose (commercial): http://www.rational.com/products/rose/ |
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Together (commercial): http://www.oi.com/products/controlcenter/index.jsp |
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InCASE - Tangram-based Universal Object Editor |
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Sybase PowerDesigner: http://www.sybase.com/powerdesigner |
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|
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UML Editors: |
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Fujaba (free, university): http://www.fujaba.de/ |
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ArgoUML (free): http://argouml.tigris.org/ |
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Poseidon (commercial): http://www.gentleware.com/products/poseidonDE.php3 |
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Co-operative UML Editor (research): http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html |
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Metamill (commercial): http://www.metamill.com/ |
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Violet (university, research, education): http://www.horstmann.com/violet/ |
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PyUt (free): http://pyut.sourceforge.net/ |
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(Dia (free): http://www.lysator.liu.se/~alla/dia/) |
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UMLet (free, university): http://www.swt.tuwien.ac.at/umlet/index.html |
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Voodoo (free): http://voodoo.sourceforge.net/ |
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Umbrello UML Modeller: http://uml.sourceforge.net/ |
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|
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UML Tools: |
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http://www.objectsbydesign.com/tools/umltools_byPrice.html |
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|
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Further readings: |
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http://www.google.com/search?q=web+based+uml+editor&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N |
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http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf |
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http://www.enhyper.com/src/documentation/ |
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http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf |
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http://citeseer.nj.nec.com/vilain00diagrammatic.html |
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http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp |
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