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## $Id: API.pm,v 1.4 2003/02/09 05:03:02 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: API.pm,v $ |
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## Revision 1.4 2003/02/09 05:03:02 joko |
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## + minor fix regarding namespace of api versioning extension module |
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## |
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## Revision 1.3 2003/02/09 04:59:27 joko |
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## + api versioning mechanism |
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## + major structure changes |
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## - refactored code to sister modules |
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## |
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## Revision 1.2 2003/01/20 16:59:48 joko |
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## + cosmetics and debugging |
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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::API; |
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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 base qw( DesignPattern::Bridge ); |
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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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|
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use Data::Compare::Struct qw( isEmpty ); |
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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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|
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sub api_constructor { |
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my $self = shift; |
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$logger->debug( __PACKAGE__ . "->api_constructor: Loading API"); |
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$self->_loadVersionExtensions(); |
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} |
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|
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|
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sub _loadVersionExtensions { |
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my $self = shift; |
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my $syncVersion = $self->{sync_version}; |
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$syncVersion ||= ''; |
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$logger->debug( __PACKAGE__ . "->loadVersionExtensions( version='$syncVersion' )"); |
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#print Dumper($self); |
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#exit; |
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my $module = "API::$syncVersion"; |
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$self->load($module); |
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} |
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|
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|
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sub configure { |
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my $self = shift; |
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|
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$logger->debug( __PACKAGE__ . "->configure"); |
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|
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my @args = @_; |
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|
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if (!isEmpty(\@args)) { |
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my %properties = @_; |
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# merge args to properties |
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#map { $self->{$_} = $properties{$_}; } keys %properties; |
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#print Dumper($self); |
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#print Dumper(\%properties); |
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if ($self->{options}) { |
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my $options_new = merge($self->{options}, \%properties); |
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#print Dumper($options_new); |
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$self->{options} = $options_new; |
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#print Dumper($self->{options}); |
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} else { |
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$self->{options} = \%properties; |
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} |
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$self->_init(); |
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#$self->_initV1(); |
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} else { |
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#print "no args!", "\n"; |
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} |
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|
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#print Dumper($self); |
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#exit; |
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|
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$self->{state}->{configured} = 1; |
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return 1; |
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} |
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|
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|
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sub setArguments { |
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my $self = shift; |
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my $args_raw = shift; |
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$self->{args_raw} = $args_raw; |
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} |
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|
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sub readArguments { |
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my $self = shift; |
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|
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my %syncConfig; |
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tie %syncConfig, 'Tie::IxHash'; |
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%syncConfig = ( |
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map => { |
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moduleName => $self->{args_raw}->{'mapping-module'}, |
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}, |
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source => { |
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dbKey => $self->{args_raw}->{source}, |
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nodeType => $self->{args_raw}->{'source-type'}, |
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nodeName => $self->{args_raw}->{'source-node'}, |
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}, |
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target => { |
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dbKey => $self->{args_raw}->{target}, |
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nodeName => $self->{args_raw}->{'target-node'}, |
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}, |
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process => { |
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mode => $self->{args_raw}->{mode}, |
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erase => $self->{args_raw}->{erase}, |
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import => $self->{args_raw}->{import}, |
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prepare => $self->{args_raw}->{prepare}, |
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}, |
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# metadata => { |
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# config => $self->{config_metadata}, |
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# } |
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); |
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|
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$self->{args} = \%syncConfig; |
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|
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} |
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|
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|
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# TODO: some feature to show off the progress of synchronization (cur/max * 100) |
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sub syncNodes { |
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|
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my $self = shift; |
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my $args = shift; |
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|
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$logger->debug( __PACKAGE__ . "->syncNodes: starting" ); |
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|
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#print Dumper($self); |
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#exit; |
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|
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#print Dumper($self->{options}); |
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$self->_prepareOptions(); |
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|
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#print Dumper($self->{options}); |
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|
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if (!$self->checkOptions()) { |
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$logger->critical( __PACKAGE__ . "->syncNodes: 'Data::Transfer::Sync::checkOptions' failed."); |
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return; |
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} |
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|
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if (!$self->{state}->{configured}) { |
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$logger->critical( __PACKAGE__ . "->syncNodes: Synchronization object is not configured/initialized correctly." ); |
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return; |
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} |
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|
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#print Dumper($args); |
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|
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# remember arguments through the whole processing |
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$self->{args} = $args; |
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|
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# hash to hold and/or fill in metadata required for the processing |
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$self->{meta} = {}; |
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|
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# hash to sum up results |
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# TODO: re-implement! (sync-statistics???) |
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|
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# detect synchronization method to determine which optical symbol (directed arrow) to use |
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my $mode = $self->{args}->{mode}; # V1 |
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$mode ||= $self->{options}->{process}->{mode}; # V2 |
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my $direction_arrow = $self->_getDirectedArrow($mode); |
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|
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# determine code versions |
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my $code_metadata_version; |
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# first, try to use version supplied by mapping-metadata |
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$code_metadata_version = $self->{options}->{metadata}->{version}; |
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# if not set, inherit from global 'sync_version' |
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$code_metadata_version ||= $self->{sync_version}; |
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|
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# load additional code from versioned namespace into current instance |
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my $dynModule = "Metadata::$code_metadata_version"; |
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$self->load($dynModule); |
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|
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# build metadata using versioned code and stuff |
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$self->options2metadata(); |
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$self->options2metadata_accessor(); |
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|
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# branch to execution path for special targets |
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# detect for option 'handler' which could be a CODEref |
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if ($self->{options}->{handler} && ref $self->{options}->{handler} eq 'CODE') { |
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$logger->info( __PACKAGE__ . "->syncNodes: Running (special handler code - no generic sync!) on '$self->{options}->{target}->{dbKey}' with MODE $self->{options}->{process}->{mode}, NODE $self->{options}->{target}->{address}"); |
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#print Dumper($self); |
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#exit; |
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# don't do this any more - it wasn't very nice somehow ... |
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#$self->{options}->{handler}->($self->{app}, $self->{options}); |
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# .... now: better let the parent application scope handle this via callback |
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# not any more required for this: $self->{app} inside here (which isn't the app we mean here) |
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# required for this: getting the options out of here: establish some getter method! ($self->getOptions(...)) |
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# so.... |
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#$self->{__bridge}->{parent_ref}-> |
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|
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# ahh okay, DesignPattern::Bridge moves closer to some Class::Inner!??? |
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# so... |
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# similar like above - but it isn't very nice anyway ... (no privateness, but: who cares?) |
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#print Dumper($self->{__bridge}); |
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# just take the global application instance and |
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# throw it into the context of the mapping module - this is heavy! ;-) (but again, who cares...) |
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# TODO: handle this more abstract *sometimes* |
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#$self->{options}->{handler}->($self->{__bridge}->{parent}->{app}, $self->{options}); |
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$self->{options}->{handler}->($self->{__bridge}->{parent}->{process}, $self->{options}); |
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|
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return; |
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} |
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|
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# TODO: execution path branch V2!!! |
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# option1: wrap this via callback to parent scope (like current impl. mechanism) |
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# option2: branch directly from here (this needs refactoring of the sub handler) |
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|
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# tracing |
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#print Dumper($self); |
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#exit; |
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|
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$logger->info( __PACKAGE__ . "->syncNodes: source=$self->{meta}->{source}->{dbKey}/$self->{meta}->{source}->{nodeName} [$self->{meta}->{source}->{nodeType}] $direction_arrow target=$self->{meta}->{target}->{dbKey}/$self->{meta}->{target}->{nodeName} [$self->{meta}->{target}->{nodeType}]" ); |
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|
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return if !$self->buildFieldmapping(); |
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return if !$self->_touchNodeSet(); |
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return if !$self->_prepare_sync(); |
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$self->_tellWhatIWillDo(); |
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|
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# tracing |
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#print Dumper($self); |
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#print Dumper($self->{args}); |
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#print Dumper($self->{options}); |
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#print Dumper($self->{meta}); |
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#print Dumper($self->{metadata}); |
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#exit; |
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|
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# finally, tell the core to start the synchronization process |
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$self->_run(); |
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|
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} |
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|
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|
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my $c_string_default = ''; |
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sub c_string { |
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my $value = shift; |
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$value ||= "[$c_string_default]"; |
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return $value; |
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} |
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|
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sub _tellWhatIWillDo { |
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my $self = shift; |
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|
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|
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#return; |
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|
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# trace |
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#print Dumper($self->{meta}); |
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#exit; |
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|
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$c_string_default = 'n/a'; |
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my $source = c_string($self->{opt}->{'source'}); |
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my $source_node = c_string($self->{opt}->{'source-node'}); |
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my $source_type = c_string($self->{opt}->{'source-type'}); |
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my $target = c_string($self->{opt}->{'target'}); |
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my $target_node = c_string($self->{opt}->{'target-node'}); |
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my $target_type = c_string($self->{opt}->{'target-type'}); |
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|
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my $mapping_module = c_string($self->{opt}->{'mapping-module'}); |
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my $mode = uc c_string($self->{opt}->{'mode'}); |
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|
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#my $ql = "$mode INTO $source NODE $source_node TYPE $source_type SELECT NODE $target_node TYPE $target_type FROM $target USING MODULE $mapping_module;"; |
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#$logger->notice( __PACKAGE__ . ": $ql" ); |
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my $ql = <<EOT; |
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|
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FETCH DATA |
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FROM STORAGE $self->{meta}->{source}->{dbKey} |
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AT NODE $self->{meta}->{source}->{accessorName}.$self->{meta}->{source}->{nodeName} |
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USING IDENTIFIER $self->{meta}->{source}->{IdentProvider}->{method}.$self->{meta}->{source}->{IdentProvider}->{arg} |
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CONVERT DATA |
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CAST FROM $self->{meta}->{source}->{nodeType} TO $self->{meta}->{target}->{nodeType} |
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MAP ATTRIBUTES FROM @{$self->{meta}->{source}->{childnodes}} TO @{$self->{meta}->{target}->{childnodes}} |
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STORE DATA |
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TO STORAGE $self->{meta}->{target}->{dbKey} |
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AT NODE $self->{meta}->{target}->{accessorName}.$self->{meta}->{target}->{nodeName} |
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USING IDENTIFIER $self->{meta}->{target}->{IdentProvider}->{method}.$self->{meta}->{target}->{IdentProvider}->{arg} |
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EOT |
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|
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|
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$logger->notice( $ql ); |
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|
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#exit; |
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return; |
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|
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my $actioning = ucfirst $self->{opt}->{'action'} . 'ing'; |
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|
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# FIXME: this is weird! |
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my $long = <<EOT; |
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|
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- $actioning data of type $target_type and |
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filtered by $target_node from the storage named $target |
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to the storage named $source - filtered by $source_node. |
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- Will attempt to convert the data to $source_type. |
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EOT |
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chomp($long); |
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$logger->notice( __PACKAGE__ . ": $long" ); |
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|
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} |
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|
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|
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sub _prepareOptions { |
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|
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my $self = shift; |
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|
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my $opts = $self->{args}; |
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|
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# patch options |
| 328 |
$opts->{source}->{nodeName} ||= ''; |
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$opts->{target}->{nodeName} ||= ''; |
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$opts->{process}->{mode} ||= ''; |
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$opts->{process}->{erase} ||= 0; |
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$opts->{process}->{prepare} ||= 0; |
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|
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# defaults (mostly for backward-compatibility to V1 - |
| 335 |
# but code mungled here out of prepareOptions_V1 from Version::V1) |
| 336 |
$opts->{metadata}->{syncMethod} ||= 'checksum'; # | timestamp |
| 337 |
$opts->{source}->{ident} ||= 'storage_method:id'; |
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$opts->{source}->{exclude} ||= [qw( cs )]; |
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$opts->{target}->{ident} ||= 'property:oid'; |
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#$map->{source_node} ||= $source_node_name; |
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#$map->{direction} ||= $opts->{mode}; # | PUSH | PULL | FULL |
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|
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# pre-check options |
| 344 |
if (!$self->_preCheckOptions($opts)) { |
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$logger->error( __PACKAGE__ . "->_prepareOptions: _preCheckOptions failed."); |
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return; |
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} |
| 348 |
|
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# inform user about option preparation |
| 350 |
$logger->debug( __PACKAGE__ . "->_prepareOptions( source.node='$opts->{source}->{nodeName}', target.node='$opts->{target}->{nodeName}', mode='$opts->{process}->{mode}', e='$opts->{process}->{erase}', p='$opts->{process}->{prepare}' )"); |
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|
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# try to load mapping-metadata-container |
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# How? Create a new instance of the given |
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# perl module/package name in ->{...}->{moduleName}. |
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# This instance is used later in the innards of the sync, |
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# that's why the module (class) should have a certain layout |
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# enabling the core to use it for gathering metadata while processing. |
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my $mapObject = DesignPattern::Object->fromPackage($opts->{map}->{moduleName}); |
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|
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# try to resolve map from metadata-container |
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|
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# type of the item/node |
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my $source_nodeType = $opts->{source}->{nodeType}; |
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|
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# check if mapping for certain node is contained in mapping object |
| 366 |
if (!$mapObject || !$mapObject->can($source_nodeType)) { |
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$logger->warning( __PACKAGE__ . "->_prepareOptions: Can't access mapping for source-type=\"$source_nodeType\" - please check \"$opts->{map}->{moduleName}\"."); |
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return; |
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} |
| 370 |
|
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# get map |
| 372 |
my $map = $mapObject->$source_nodeType; |
| 373 |
#print Dumper($map); |
| 374 |
|
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my $map_version = $map->{metadata}->{version}; |
| 376 |
# FIXME: backward compatibility |
| 377 |
if (!$map_version) { |
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$self->options_to_V2($map); |
| 379 |
} |
| 380 |
|
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# trace |
| 382 |
#print Dumper($map); |
| 383 |
#exit; |
| 384 |
#print "ref: ", ref $map->{target}, "\n"; |
| 385 |
#print "target: ", $map->{target}, "\n"; |
| 386 |
|
| 387 |
# check here if "target" is actually a CODEref - in this case: resolve it - deprecated!!! ??? |
| 388 |
if (ref $map->{target}->{address} eq 'CODE') { |
| 389 |
$map->{target}->{address} = $map->{target}->{address}->($source_nodeType); |
| 390 |
} |
| 391 |
|
| 392 |
# resolve expressions (on nodename-level) here |
| 393 |
elsif ($map->{target}->{address} =~ m/^(code|expr):(.+?)$/) { |
| 394 |
my $target_dynamic_type = $1; |
| 395 |
my $target_dynamic_expression = $2; |
| 396 |
if (lc $target_dynamic_type eq 'code') { |
| 397 |
$map->{target} = $mapObject->$target_dynamic_expression($map); |
| 398 |
} |
| 399 |
} |
| 400 |
|
| 401 |
# merging - V1 |
| 402 |
#map { $opts->{$_} = $map->{$_}; } keys %$map; |
| 403 |
# trace |
| 404 |
#print Dumper($self->{options}); |
| 405 |
|
| 406 |
# merging - V2 |
| 407 |
|
| 408 |
# merge local map with local opts |
| 409 |
|
| 410 |
# delete undef'd items in $map |
| 411 |
|
| 412 |
# enable cloning |
| 413 |
# FIXME: do we really need cloning here? trade safety/encapsulation for speed? |
| 414 |
Hash::Merge::set_clone_behavior(1); |
| 415 |
Hash::Merge::set_behavior( 'RIGHT_PRECEDENT' ); |
| 416 |
#Hash::Merge::set_behavior( 'STORAGE_PRECEDENT' ); |
| 417 |
#Hash::Merge::set_behavior( 'RETAINMENT_PRECEDENT' ); |
| 418 |
# TODO: add an option to Hash::Merge not to overwrite set items with undefined/empty/not assigned ones |
| 419 |
my $locals_merged = merge( $opts, $map ); |
| 420 |
|
| 421 |
# trace |
| 422 |
#print Dumper($opts); |
| 423 |
#print Dumper($map); |
| 424 |
#print Dumper($locals_merged); |
| 425 |
#exit; |
| 426 |
|
| 427 |
# merge local-merged ones with instance-wide options |
| 428 |
Hash::Merge::set_clone_behavior(0); |
| 429 |
$self->{options} = merge( $self->{options}, $locals_merged ); |
| 430 |
|
| 431 |
# trace |
| 432 |
#print Dumper($self->{options}); |
| 433 |
#exit; |
| 434 |
|
| 435 |
|
| 436 |
$self->{state}->{options_ready} = 1; |
| 437 |
|
| 438 |
return 1; |
| 439 |
|
| 440 |
} |
| 441 |
|
| 442 |
|
| 443 |
sub _preCheckOptions { |
| 444 |
|
| 445 |
my $self = shift; |
| 446 |
my $opts = shift; |
| 447 |
|
| 448 |
# trace |
| 449 |
#print Dumper($opts); |
| 450 |
#exit; |
| 451 |
|
| 452 |
if (!$opts->{process}->{mode}) { |
| 453 |
$logger->error( __PACKAGE__ . "->_preCheckOptions failed: Please specify \"--action=(load|save)\"."); |
| 454 |
return; |
| 455 |
} |
| 456 |
|
| 457 |
# the type of the to-be-synced item |
| 458 |
if (!$opts->{source}->{nodeType}) { |
| 459 |
$logger->error( __PACKAGE__ . "->_preCheckOptions failed: Please specify \"source-type\"."); |
| 460 |
return; |
| 461 |
} |
| 462 |
# the name of the (container-) node the items are listed in |
| 463 |
if (!$opts->{source}->{nodeName}) { |
| 464 |
$logger->error( __PACKAGE__ . "->_preCheckOptions failed: Please specify \"source-node\"."); |
| 465 |
return; |
| 466 |
} |
| 467 |
|
| 468 |
# a "map"-declaration which module to use for mapping- and/or lookup-purposes |
| 469 |
if (!$opts->{map}) { |
| 470 |
$logger->warning( __PACKAGE__ . "->_preCheckOptions: No mapping supplied - please check key 'map|mappings' in global configuration or specify additional argument '--mapping-module'."); |
| 471 |
return; |
| 472 |
} |
| 473 |
if (!$opts->{map}->{moduleName}) { |
| 474 |
$logger->warning( __PACKAGE__ . "->_preCheckOptions: Currently only perl-modules can provide mappings: Please specify one with '--mapping-module=My::Mapping::Module'."); |
| 475 |
return; |
| 476 |
} |
| 477 |
|
| 478 |
return 1; |
| 479 |
|
| 480 |
} |
| 481 |
|
| 482 |
|
| 483 |
|
| 484 |
sub _prepare_sync { |
| 485 |
|
| 486 |
my $self = shift; |
| 487 |
|
| 488 |
# TODO: |
| 489 |
# + if action == PUSH: start processing |
| 490 |
# -+ if action == PULL: swap metadata and start processing |
| 491 |
# - if action == FULL: start processing, then swap metadata and (re-)start processing |
| 492 |
|
| 493 |
#print "dir: ", $self->{args}->{direction}, "\n"; |
| 494 |
|
| 495 |
# manipulate metainfo according to direction of synchronization |
| 496 |
if (lc $self->{options}->{process}->{mode} eq 'push') { |
| 497 |
# just do it ... (don't modify any metadata) |
| 498 |
|
| 499 |
} elsif (lc $self->{options}->{process}->{mode} eq 'pull') { |
| 500 |
# swap source and target metadata |
| 501 |
# TODO: introduce different mechanism to make more then two partners (descents) possible |
| 502 |
($self->{meta}->{source}, $self->{meta}->{target}) = |
| 503 |
($self->{meta}->{target}, $self->{meta}->{source}); |
| 504 |
#($self->{options}->{source}, $self->{options}->{target}) = |
| 505 |
# ($self->{options}->{target}, $self->{options}->{source}); |
| 506 |
|
| 507 |
} elsif (lc $self->{options}->{process}->{mode} eq 'full') { |
| 508 |
# TODO: |
| 509 |
# do a pull first and a push afterwards |
| 510 |
# this requires us to be called somehow recursively - just one recursion level ;-) |
| 511 |
|
| 512 |
} else { |
| 513 |
# TODO: are there any other synchronization modes besides PULL, PUSH, FULL? |
| 514 |
|
| 515 |
} |
| 516 |
|
| 517 |
# import flag means: prepare the source node to be syncable |
| 518 |
# this is useful if there are e.g. no "ident" or "checksum" columns yet inside a DBI like (row-based) storage |
| 519 |
if ($self->{args}->{prepare}) { |
| 520 |
$self->_prepareNode_MetaProperties('source'); |
| 521 |
$self->_prepareNode_DummyIdent('source'); |
| 522 |
#return; |
| 523 |
#$self->_erase_all($opts->{source_node}); |
| 524 |
} |
| 525 |
|
| 526 |
# erase flag means: erase the target |
| 527 |
#if ($opts->{erase}) { |
| 528 |
if ($self->{args}->{erase}) { |
| 529 |
# TODO: move this method to the scope of the synchronization core and wrap it around different handlers |
| 530 |
#print "ERASE", "\n"; |
| 531 |
$self->_erase_all('target'); |
| 532 |
} |
| 533 |
|
| 534 |
return 1; |
| 535 |
|
| 536 |
} |
| 537 |
|
| 538 |
sub _getDirectedArrow { |
| 539 |
my $self = shift; |
| 540 |
my $mode = shift; |
| 541 |
$mode ||= ''; |
| 542 |
|
| 543 |
if (lc $mode eq 'push') { |
| 544 |
return '->'; |
| 545 |
} elsif (lc $mode eq 'pull') { |
| 546 |
return '<-'; |
| 547 |
} elsif (lc $mode eq 'full') { |
| 548 |
return '<->'; |
| 549 |
} else { |
| 550 |
return ''; |
| 551 |
} |
| 552 |
} |
| 553 |
|
| 554 |
1; |
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