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1170
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use strict; |
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use warnings; |
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package RDF::Flow::Pipeline; |
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{ |
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$RDF::Flow::Pipeline::VERSION = '0.178'; |
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} |
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#ABSTRACT: Pipelines multiple sources |
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use Log::Contextual::WarnLogger; |
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use Log::Contextual qw(:log), -default_logger |
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=> Log::Contextual::WarnLogger->new({ env_prefix => __PACKAGE__ }); |
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1235
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use parent 'RDF::Flow::Source'; |
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use RDF::Flow::Source qw(:util); |
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sub new { |
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my $class = shift; |
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my ($inputs, $args) = sourcelist_args( @_ ); |
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my $self = bless { |
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inputs => $inputs, |
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name => ($args->{name} || 'anonymous pipeline'), |
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}, $class; |
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$self->match( $args->{match} ); |
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return $self; |
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} |
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sub retrieve_rdf { |
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my ($self, $env) = @_; |
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foreach my $src ( $self->inputs ) { |
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my $rdf = $src->retrieve( $env ); |
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$env->{'rdflow.data'} = $rdf; |
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last if empty_rdf( $rdf ); |
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} |
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$env->{'rdflow.data'}; |
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} |
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# experimental |
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sub _graphviz_edgeattr { |
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my ($self,$n) = @_; |
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return (label => sprintf("%d.",$n)); |
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} |
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48
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1; |
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50
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51
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__END__ |
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=pod |
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54
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=head1 NAME |
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56
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RDF::Flow::Pipeline - Pipelines multiple sources |
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58
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=head1 VERSION |
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60
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version 0.178 |
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62
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=head1 SYNOPSIS |
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64
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use RDF::Flow::Pipeline; |
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66
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$src = pipeline( @sources ); # shortcut |
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68
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$src = RDF::Flow::Pipeline->new( @sources ); # explicit |
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70
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$rdf = $src->retrieve( $env ); |
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$rdf == $env->{'rdflow.data'}; # always true |
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73
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# pipeline as conditional: if $s1 has content then union of $s1 and $s2 |
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use RDF::Flow qw(pipeline union previous); |
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pipeline( $s1, union( previous, $s2 ) ); |
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$s1->pipe_to( union( previous, $s2) ); # equivalent |
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78
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=head1 DESCRIPTION |
79
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80
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This L<RDF::Flow::Source> wraps other sources as pipeline. Sources are |
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retrieved one after another. The response of each source is saved in the |
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environment variable C<rdflow.data> which is accesible to the next source. |
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The pipeline is aborted without error if C<rdflow.data> has not content, so |
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you can also use a pipleline as conditional branch. To pipe one source after |
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another, you can also use a source's C<pipe_to> method. |
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87
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The module L<RDF::Flow> exports functions C<pipeline> and C<previous> on |
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request. |
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90
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=head1 SEE ALSO |
91
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92
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L<RDF::Flow::Cascade>, L<RDF::Flow::Union> |
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94
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=head1 AUTHOR |
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96
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Jakob Voà <voss@gbv.de> |
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98
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=head1 COPYRIGHT AND LICENSE |
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100
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This software is copyright (c) 2011 by Jakob VoÃ. |
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102
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This is free software; you can redistribute it and/or modify it under |
103
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the same terms as the Perl 5 programming language system itself. |
104
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105
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=cut |
106
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