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# $Id: Storage.pm,v 1.10 2002/12/07 03:37:23 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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# |
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# $Log: Storage.pm,v $ |
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# Revision 1.10 2002/12/07 03:37:23 joko |
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# + updated pod |
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# |
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# Revision 1.9 2002/12/01 22:15:45 joko |
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# - sub createDb: moved to handler |
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# |
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# Revision 1.8 2002/11/29 04:48:23 joko |
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# + updated pod |
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# |
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# Revision 1.7 2002/11/17 06:07:18 joko |
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# + creating the handler is easier than proposed first - for now :-) |
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# + sub testAvailability |
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# |
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# Revision 1.6 2002/11/09 01:04:58 joko |
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# + updated pod |
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# |
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# Revision 1.5 2002/10/29 19:24:18 joko |
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# - reduced logging |
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# + added some pod |
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# |
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# Revision 1.4 2002/10/27 18:35:07 joko |
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# + added pod |
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# |
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# Revision 1.3 2002/10/25 11:40:37 joko |
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# + enhanced robustness |
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# + more logging for debug-levels |
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# + sub dropDb |
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# |
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# Revision 1.2 2002/10/17 00:04:29 joko |
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# + sub createDb |
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# + sub isConnected |
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# + bugfixes regarding "deep recursion" stuff |
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# |
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# Revision 1.1 2002/10/10 03:43:12 cvsjoko |
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# + new |
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# |
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############################################ |
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|
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|
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BEGIN { |
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$Data::Storage::VERSION = 0.02; |
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} |
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|
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|
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=head1 NAME |
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|
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Data::Storage - Interface for accessing various Storage implementations for Perl in an independent way |
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|
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|
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=head1 AIMS |
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|
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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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|
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=head1 SYNOPSIS |
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|
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=head2 BASIC ACCESS |
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|
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=head2 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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|
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=head2 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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|
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=head2 NOTE |
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|
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This module heavily relies on DBI and Tangram, but adds a lot of additional bugs and quirks. |
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Please look at their documentation and/or this code for additional information. |
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|
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|
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=head1 REQUIREMENTS |
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|
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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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=cut |
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|
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# The POD text continues at the end of the file. |
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|
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|
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package Data::Storage; |
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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 Data::Storage::Locator; |
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use Data::Dumper; |
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|
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# TODO: actually implement level (integrate with Log::Dispatch) |
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my $TRACELEVEL = 0; |
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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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sub new { |
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my $invocant = shift; |
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my $class = ref($invocant) || $invocant; |
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#my @args = normalizeArgs(@_); |
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|
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my $arg_locator = shift; |
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my $arg_options = shift; |
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|
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#my $self = { STORAGEHANDLE => undef, @_ }; |
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my $self = { STORAGEHANDLE => undef, locator => $arg_locator, options => $arg_options }; |
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#$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->new(@_)" ); |
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$logger->debug( __PACKAGE__ . "[$arg_locator->{type}]" . "->new(@_)" ); |
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return bless $self, $class; |
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} |
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|
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sub AUTOLOAD { |
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|
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# since this is a core function acting as dispatcher to $self->{STORAGEHANDLE}, |
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# some sophisticated handling and filtering is needed to avoid things like |
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# - Deep recursion on subroutine "Data::Storage::AUTOLOAD" |
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# - Deep recursion on subroutine "Data::Storage::Handler::Abstract::AUTOLOAD" |
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# - Deep recursion on anonymous subroutine at [...] |
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# we also might filter log messages caused by logging to itself in "advanced logging of AUTOLOAD calls" |
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|
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my $self = shift; |
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our $AUTOLOAD; |
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|
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# ->DESTROY would - if not declared - trigger an AUTOLOAD also |
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return if $AUTOLOAD =~ m/::DESTROY$/; |
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|
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my $method = $AUTOLOAD; |
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$method =~ s/^.*:://; |
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|
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# advanced logging of AUTOLOAD calls ... |
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# ... nice but do it only when TRACING (TODO) is enabled |
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if ($TRACELEVEL) { |
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my $logstring = ""; |
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$logstring .= __PACKAGE__ . "[$self->{locator}->{type}]" . "->" . $method; |
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#print "count: ", $#_, "\n"; |
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#$logstring .= Dumper(@_) if ($#_ != -1); |
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my $tabcount = int( (80 - length($logstring)) / 10 ); |
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$logstring .= "\t" x $tabcount . "(AUTOLOAD)"; |
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# TODO: only ok if logstring doesn't contain |
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# e.g. "Data::Storage[Tangram]->insert(SystemEvent=HASH(0x5c0034c)) (AUTOLOAD)" |
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# but that would be _way_ too specific as long as we don't have an abstract handler for this ;) |
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$logger->debug( $logstring ); |
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#print join('; ', @_); |
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} |
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|
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# filtering AUTOLOAD calls and first-time-touch of the actual storage impl |
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if ($self->_filter_AUTOLOAD($method)) { |
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#print "_accessStorage\n"; |
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$self->_accessStorage(); |
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$self->{STORAGEHANDLE}->$method(@_); |
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} |
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|
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} |
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|
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sub _filter_AUTOLOAD { |
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my $self = shift; |
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my $method = shift; |
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if ($self->{options}->{protected}) { |
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if ($method eq 'disconnect') { |
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return; |
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} |
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} |
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return 1; |
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} |
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|
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|
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sub normalizeArgs { |
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my %args = @_; |
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if (!$args{dsn} && $args{meta}{dsn}) { |
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$args{dsn} = $args{meta}{dsn}; |
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} |
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my @result = %args; |
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return @result; |
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} |
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|
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sub _accessStorage { |
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my $self = shift; |
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# TODO: to some tracelevel! |
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if ($TRACELEVEL) { |
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$logger->debug( __PACKAGE__ . "[$self->{locator}->{type}]" . "->_accessStorage()" ); |
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} |
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if (!$self->{STORAGEHANDLE}) { |
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$self->_createStorageHandle(); |
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} |
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} |
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|
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sub _createStorageHandle { |
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my $self = shift; |
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my $type = $self->{locator}->{type}; |
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$logger->debug( __PACKAGE__ . "[$type]" . "->_createStorageHandle()" ); |
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|
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my $pkg = "Data::Storage::Handler::" . $type . ""; |
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|
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# try to load perl module at runtime |
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my $evalstr = "use $pkg;"; |
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eval($evalstr); |
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if ($@) { |
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$logger->error( __PACKAGE__ . "[$type]" . "->_createStorageHandle(): $@" ); |
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return; |
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} |
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|
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# build up some additional arguments to pass on |
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#my @args = %{$self->{locator}}; |
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my @args = (); |
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|
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# - create new storage handle object |
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# - propagate arguments to handler |
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# - pass locator by reference to be able to store status- or meta-information in it |
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$self->{STORAGEHANDLE} = $pkg->new( locator => $self->{locator}, @args ); |
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|
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} |
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|
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sub addLogDispatchHandler { |
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|
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my $self = shift; |
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my $name = shift; |
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my $package = shift; |
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my $logger1 = shift; |
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my $objectCreator = shift; |
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|
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#$logger->add( Log::Dispatch::Tangram->new( name => $name, |
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$logger->add( $package->new( name => $name, |
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#min_level => 'debug', |
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min_level => 'info', |
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storage => $self, |
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objectCreator => $objectCreator, |
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fields => { |
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message => 'usermsg', |
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timestamp => 'stamp', |
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level => 'level', |
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name => 'code', |
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}, |
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filter_patterns => [ '->insert\(SystemEvent=' ], |
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#filter_patterns => [ 'SystemEvent' ], |
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|
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#format => '[%d] [%p] %m%n', |
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) ); |
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|
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} |
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|
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sub removeLogDispatchHandler { |
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my $self = shift; |
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my $name = shift; |
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#my $logger = shift; |
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$logger->remove($name); |
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} |
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|
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sub getDbName { |
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my $self = shift; |
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my $dsn = $self->{locator}->{dbi}->{dsn}; |
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$dsn =~ m/database=(.+?);/; |
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my $database_name = $1; |
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return $database_name; |
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} |
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|
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sub testDsn { |
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my $self = shift; |
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my $dsn = $self->{locator}->{dbi}->{dsn}; |
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my $result; |
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if ( my $dbh = DBI->connect($dsn, '', '', { |
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PrintError => 0, |
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} ) ) { |
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|
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# TODO: REVIEW |
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$dbh->disconnect(); |
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|
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return 1; |
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} else { |
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$logger->warning( __PACKAGE__ . "[$self->{locator}->{type}]" . "->testDsn(): " . "DBI-error: " . $DBI::errstr ); |
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} |
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} |
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|
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sub testAvailability { |
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my $self = shift; |
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my $status = $self->testDsn(); |
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$self->{locator}->{status}->{available} = $status; |
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return $status; |
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} |
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|
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|
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sub dropDb { |
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my $self = shift; |
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my $dsn = $self->{locator}->{dbi}->{dsn}; |
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|
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$logger->debug( __PACKAGE__ . "->dropDb( dsn $dsn )" ); |
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|
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$dsn =~ s/database=(.+?);//; |
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my $database_name = $1; |
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|
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my $ok; |
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|
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if ( my $dbh = DBI->connect($dsn, '', '', { |
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PrintError => 0, |
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} ) ) { |
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if ($database_name) { |
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if ($dbh->do("DROP DATABASE $database_name;")) { |
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$ok = 1; |
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} |
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} |
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|
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$dbh->disconnect(); |
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|
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} |
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|
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return $ok; |
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} |
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|
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sub isConnected { |
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my $self = shift; |
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return 1 if $self->{STORAGEHANDLE}; |
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} |
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|
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1; |
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__END__ |
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|
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|
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=head1 DESCRIPTION |
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|
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=head2 Data::Storage |
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|
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Data::Storage is a module for accessing various "data structures / kinds of structured data" stored inside |
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various "data containers". |
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We tried to use the AdapterPattern (http://c2.com/cgi/wiki?AdapterPattern) to implement a wrapper-layer |
| 432 |
around core CPAN modules (Tangram, DBI). |
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|
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=head2 Why? |
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|
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You will get a better code-structure (not bad for later maintenance) in growing Perl code projects, |
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especially when using multiple database connections at the same time. |
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You will be able to switch between different _kinds_ of implementations used for storing data. |
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Your code will use the very same API to access these storage layers. |
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... implementation has to be changed for now |
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Maybe you will be able to switch "on-the-fly" without changing any bits in code in the future.... |
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... but that's not the focus |
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|
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=head2 What else? |
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|
| 446 |
Having this, we were able to do implement a generic data synchronization module more easy, |
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please look at Data::Transfer. |
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|
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|
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=head1 AUTHORS / COPYRIGHT |
| 451 |
|
| 452 |
The Data::Storage module is Copyright (c) 2002 Andreas Motl. |
| 453 |
All rights reserved. |
| 454 |
You may distribute it under the terms of either the GNU General Public |
| 455 |
License or the Artistic License, as specified in the Perl README file. |
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|
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|
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=head1 ACKNOWLEDGEMENTS |
| 459 |
|
| 460 |
Larry Wall for Perl, Tim Bunce for DBI, Jean-Louis Leroy for Tangram and Set::Object, |
| 461 |
Sam Vilain for Class::Tangram, Jochen Wiedmann and Jeff Zucker for DBD::CSV & Co., |
| 462 |
Adam Spiers for MySQL::Diff and all contributors. |
| 463 |
|
| 464 |
|
| 465 |
=head1 SUPPORT / WARRANTY |
| 466 |
|
| 467 |
Data::Storage is free software. IT COMES WITHOUT WARRANTY OF ANY KIND. |
| 468 |
|
| 469 |
|
| 470 |
=head1 TODO |
| 471 |
|
| 472 |
|
| 473 |
=head2 BUGS |
| 474 |
|
| 475 |
"DBI-Error [Tangram]: DBD::mysql::st execute failed: Unknown column 't1.requestdump' in 'field list'" |
| 476 |
|
| 477 |
... occours when operating on object-attributes not introduced yet: |
| 478 |
this should be detected and appended/replaced through: |
| 479 |
"Schema-Error detected, maybe (just) an inconsistency. |
| 480 |
Please check if your declaration in schema-module "a" matches structure in database "b" or try to run" |
| 481 |
db_setup.pl --dbkey=import --action=deploy |
| 482 |
|
| 483 |
|
| 484 |
Compare schema (structure diff) with database ... |
| 485 |
|
| 486 |
... when issuing "db_setup.pl --dbkey=import --action=deploy" |
| 487 |
on a database with an already deployed schema, use an additional "--update" then |
| 488 |
to lift the schema inside the database to the current declared schema. |
| 489 |
You will have to approve removals and changes on field-level while |
| 490 |
new objects and new fields are introduced silently without any interaction needed. |
| 491 |
In future versions there may be additional options to control silent processing of |
| 492 |
removals and changes. |
| 493 |
See this CRUD-table applying to the actions occouring on Classes and Class variables when deploying schemas, |
| 494 |
don't mix this up with CRUD-actions on Objects, these are already handled by (e.g.) Tangram itself. |
| 495 |
Classes: |
| 496 |
C create -> yes, handled automatically |
| 497 |
R retrieve -> no, not subject of this aspect since it is about deployment only |
| 498 |
U update -> yes, automatically for Class meta-attributes, yes/no for Class variables (look at the rules down here) |
| 499 |
D delete -> yes, just by user-interaction |
| 500 |
Class variables: |
| 501 |
C create -> yes, handled automatically |
| 502 |
R retrieve -> no, not subject of this aspect since it is about deployment only |
| 503 |
U update -> yes, just by user-interaction; maybe automatically if it can be determined that data wouldn't be lost |
| 504 |
D delete -> yes, just by user-interaction |
| 505 |
|
| 506 |
It's all about not to be able to loose data simply while this is in pre-alpha stage. |
| 507 |
And loosing data by being able to modify and redeploy schemas easily is definitely quite easy. |
| 508 |
|
| 509 |
As we can see, creations of Classes and new Class variables is handled |
| 510 |
automatically and this is believed to be the most common case under normal circumstances. |
| 511 |
|
| 512 |
|
| 513 |
=head2 FEATURES |
| 514 |
|
| 515 |
- Get this stuff together with UML (Unified Modeling Language) and/or standards from ODMG. |
| 516 |
- Make it possible to load/save schemas in XMI (XML Metadata Interchange), |
| 517 |
which seems to be most commonly used today, perhaps handle objects with OIFML. |
| 518 |
Integrate/bundle this with a web-/html-based UML modeling tool or |
| 519 |
some other interesting stuff like the "Co-operative UML Editor" from Uni Darmstadt. (web-/java-based) |
| 520 |
- Enable Round Trip Engineering. Keep code and diagrams in sync. Don't annoy/bother the programmers. |
| 521 |
- Add support for some more handlers/locators to be able to |
| 522 |
access the following standards/protocols/interfaces/programs/apis transparently: |
| 523 |
+ DBD::CSV (via Data::Storage::Handler::DBI) |
| 524 |
(-) Text::CSV, XML::CSV, XML::Excel |
| 525 |
- MAPI |
| 526 |
- LDAP |
| 527 |
- DAV (look at PerlDAV: http://www.webdav.org/perldav/) |
| 528 |
- Mbox (use formail for seperating/splitting entries/nodes) |
| 529 |
- Cyrus (cyrdeliver - what about cyrretrieve (export)???) |
| 530 |
- use File::DiffTree, use File::Compare |
| 531 |
- Hibernate |
| 532 |
- "Win32::UserAccountDb" |
| 533 |
- "*nix::UserAccountDb" |
| 534 |
- .wab - files (Windows Address Book) |
| 535 |
- .pst - files (Outlook Post Storage?) |
| 536 |
- XML (e.g. via XML::Simple?) |
| 537 |
- Move to t3, look at InCASE |
| 538 |
- some kind of security layer for methods/objects |
| 539 |
- acls (stored via tangram/ldap?) for functions, methods and objects (entity- & data!?) |
| 540 |
- where are the hooks needed then? |
| 541 |
- is Data::Storage & Co. okay, or do we have to touch the innards of DBI and/or Tangram? |
| 542 |
- an attempt to start could be: |
| 543 |
- 'sub getACLByObjectId($id, $context)' |
| 544 |
- 'sub getACLByMethodname($id, $context)' |
| 545 |
- 'sub getACLByName($id, $context)' |
| 546 |
( would require a kinda registry to look up these very names pointing to arbitrary locations (code, data, ...) ) |
| 547 |
|
| 548 |
|
| 549 |
|
| 550 |
=head3 LINKS / REFERENCES |
| 551 |
|
| 552 |
Specs: |
| 553 |
UML 1.3 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-06-08.pdf |
| 554 |
XMI 1.1 Spec: http://cgi.omg.org/cgi-bin/doc?ad/99-10-02.pdf |
| 555 |
XMI 2.0 Spec: http://cgi.omg.org/docs/ad/01-06-12.pdf |
| 556 |
ODMG: http://odmg.org/ |
| 557 |
OIFML: http://odmg.org/library/readingroom/oifml.pdf |
| 558 |
|
| 559 |
CASE Tools: |
| 560 |
Rational Rose (commercial): http://www.rational.com/products/rose/ |
| 561 |
Together (commercial): http://www.oi.com/products/controlcenter/index.jsp |
| 562 |
InCASE - Tangram-based Universal Object Editor |
| 563 |
Sybase PowerDesigner: http://www.sybase.com/powerdesigner |
| 564 |
|
| 565 |
UML Editors: |
| 566 |
Fujaba (free, university): http://www.fujaba.de/ |
| 567 |
ArgoUML (free): http://argouml.tigris.org/ |
| 568 |
Poseidon (commercial): http://www.gentleware.com/products/poseidonDE.php3 |
| 569 |
Co-operative UML Editor (research): http://www.darmstadt.gmd.de/concert/activities/internal/umledit.html |
| 570 |
Metamill (commercial): http://www.metamill.com/ |
| 571 |
Violet (university, research, education): http://www.horstmann.com/violet/ |
| 572 |
PyUt (free): http://pyut.sourceforge.net/ |
| 573 |
(Dia (free): http://www.lysator.liu.se/~alla/dia/) |
| 574 |
UMLet (free, university): http://www.swt.tuwien.ac.at/umlet/index.html |
| 575 |
Voodoo (free): http://voodoo.sourceforge.net/ |
| 576 |
Umbrello UML Modeller: http://uml.sourceforge.net/ |
| 577 |
|
| 578 |
UML Tools: |
| 579 |
http://www.objectsbydesign.com/tools/umltools_byPrice.html |
| 580 |
|
| 581 |
Further readings: |
| 582 |
http://www.google.com/search?q=web+based+uml+editor&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N |
| 583 |
http://www.fernuni-hagen.de/DVT/Aktuelles/01FHHeidelberg.pdf |
| 584 |
http://www.enhyper.com/src/documentation/ |
| 585 |
http://cis.cs.tu-berlin.de/Dokumente/Diplomarbeiten/2001/skinner.pdf |
| 586 |
http://citeseer.nj.nec.com/vilain00diagrammatic.html |
| 587 |
http://archive.devx.com/uml/articles/Smith01/Smith01-3.asp |
| 588 |
|
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