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package KiokuDB::TypeMap::Entry::Callback; |
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BEGIN { |
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$KiokuDB::TypeMap::Entry::Callback::AUTHORITY = 'cpan:NUFFIN'; |
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} |
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$KiokuDB::TypeMap::Entry::Callback::VERSION = '0.57'; |
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use Moose; |
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# ABSTRACT: Callback based inflation/deflation of objects |
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no warnings 'recursion'; |
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use Carp qw(croak); |
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use namespace::clean -except => 'meta'; |
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with qw(KiokuDB::TypeMap::Entry::Std); |
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has [qw(collapse expand)] => ( |
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is => "ro", |
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isa => "Str|CodeRef", |
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required => 1, |
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); |
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has [qw(id refresh)] => ( |
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is => "ro", |
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isa => "Str|CodeRef", |
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); |
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sub compile_collapse_body { |
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my ( $self, $class, @args ) = @_; |
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my $collapse_object = $self->collapse; |
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return sub { |
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my ( $self, %args ) = @_; |
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my @data = $args{object}->$collapse_object; |
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my $data; |
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if ( @data == 1 and not ref $data[0] ) { |
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$data = $data[0]; |
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} else { |
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$data = [ map { $self->visit($_) } @data ]; |
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} |
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return $self->make_entry( |
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%args, |
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data => $data, |
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); |
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}; |
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} |
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sub _entry_data_to_args { |
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my ( $self, $linker, $entry ) = @_; |
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my $data = $entry->data; |
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if ( ref $data ) { |
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my @args; |
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my $refs = 0; |
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foreach my $value ( @$data ) { |
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if ( ref $value ) { |
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push @args, undef; |
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$linker->inflate_data($value, \$args[-1]); |
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$refs++; |
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} else { |
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push @args, $value; |
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} |
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} |
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$linker->load_queue if $refs; # force @args to be fully vivified |
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return @args; |
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} else { |
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return $data; |
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} |
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} |
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sub compile_expand { |
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my ( $self, $class, @args ) =@_; |
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my $expand_object = $self->expand; |
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return sub { |
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my ( $linker, $entry ) = @_; |
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my @args = $self->_entry_data_to_args($linker, $entry); |
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# does *NOT* support circular refs |
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my $object = $entry->class->$expand_object(@args); |
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$linker->register_object( $entry => $object ); |
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return $object; |
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}; |
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} |
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sub compile_refresh { |
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my ( $self, $class, @args ) = @_; |
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if ( my $refresh_object = $self->refresh ) { |
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return sub { |
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my ( $linker, $object, $entry ) = @_; |
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my @args = $self->_entry_data_to_args($linker, $entry); |
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$object->$refresh_object(@args); |
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return $object; |
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}; |
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} else { |
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return sub { |
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croak "No refresh method provided for $class by typemap entry $self"; |
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}; |
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} |
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} |
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sub compile_id { |
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my ( $self, $class, @args ) = @_; |
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if ( my $get_id = $self->id ) { |
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return sub { |
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my ( $self, $object ) = @_; |
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$object->$get_id; |
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}; |
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} else { |
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return "generate_uuid"; |
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} |
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} |
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__PACKAGE__->meta->make_immutable; |
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__PACKAGE__ |
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__END__ |
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=pod |
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=encoding UTF-8 |
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=head1 NAME |
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KiokuDB::TypeMap::Entry::Callback - Callback based inflation/deflation of objects |
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148
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=head1 VERSION |
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version 0.57 |
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152
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=head1 SYNOPSIS |
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154
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KiokuDB::TypeMap->new( |
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entries => { |
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'My::Class' => KiokuDB::TypeMap::Entry::Callback->new( |
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expand => "new", # My::Class->new(%$self) |
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collapse => sub { |
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my $self = shift; |
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return %$self; # provide args to 'new' in this example |
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}, |
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id => sub { "foo" }, # 'id' callback is optional |
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), |
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}, |
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); |
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167
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=head1 DESCRIPTION |
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This L<KiokuDB::TypeMap> entry provides callback based inflation/deflation. |
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The major limitation of this method is that it cannot be used for self |
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referential structures. This is because the object being inflated is only |
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constructed after all of its arguments are. |
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For the overwhelming majority of the use cases this is good enough though. |
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177
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=head1 ATTRIBUTES |
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=over 4 |
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181
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=item collapse |
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A method name or code reference invoked on the object during collapsing. |
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This is evaluated in list context, and the list of values it returns will be |
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collapsed by the L<KiokuDB::Collapser> and then stored. |
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188
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=item expand |
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A method name or code reference invoked on the class of the object during loading. |
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The arguments are as returned by the C<collapse> callback. |
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=item id |
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An optional method name or code reference invoked to get an ID for the object. |
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If one is not provided the default (UUID based) generation is used. |
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=item intrinsic |
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A boolean denoting whether or not the object should be collapsed with no ID, |
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and serialized as part of its parent object. |
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This is useful for value like objects, for whom the reference address makes no |
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difference (such as L<URI> objects). |
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=back |
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=head1 AUTHOR |
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Yuval Kogman <nothingmuch@woobling.org> |
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=head1 COPYRIGHT AND LICENSE |
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This software is copyright (c) 2014 by Yuval Kogman, Infinity Interactive. |
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This is free software; you can redistribute it and/or modify it under |
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the same terms as the Perl 5 programming language system itself. |
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221
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=cut |