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package TM::ObjectAble; |
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use strict; |
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use warnings; |
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use Data::Dumper; |
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use Class::Trait 'base'; |
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=pod |
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=head1 NAME |
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TM::Synchronizable - Topic Maps, trait for storing objects into backends |
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=head1 SYNOPSIS |
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my $tm = .... # get a topic map from somewhere |
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use Class::Trait; |
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Class::Trait->apply ($tm, "TM::ObjectAble"); |
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my %store; # find yourself a proper store, can be anything HASHish |
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# append it to the list of stores, or .... |
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push @{ $tm->storages }, \%store; |
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# prepend it to the list of stores |
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unshift @{ $tm->storages }, \%store; |
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# store it (the proper storage will take it) |
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$tm->objectify ('tm:some-topic', "whatever object or data"); |
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# get it back |
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my @objects = $tm->object ('tm:some-topic', 'tm:some-topic2'); |
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# get rid of it |
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$tm->deobjectify ('tm:some-topic'); |
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=cut |
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=head1 DESCRIPTION |
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This trait implements functionality to store arbitrary data on a per-topic basis. |
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Conceptually, the storage can be thought as one large hash, as keys being use the internal topic |
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identifiers, as values the object data. But to allow different topics to store their object data in |
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different places, this interface works with a list of such hashes. Each hash (native or tied to some |
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implementation) in the list is visited (starting from the start of the list) and can take over the |
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storage. Whether this is based on the topic id, on some other topic information, or on the MIME type |
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of the data (if it has one), is up to the implementation to decide. |
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=head1 INTERFACE |
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=head2 Methods |
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=over |
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=item B |
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I<$listref> = I<$tm>->storages |
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This method returns an array reference. You can C or C your storage implementation |
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onto this list. |
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Example: |
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my %store1; |
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push @{ $tm->storages }, \%store1 |
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=cut |
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sub storages { |
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my $self = shift; |
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$self->{'.storages'} //= []; |
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return $self->{'.storages'} |
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} |
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=pod |
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=item B |
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I<$tm>->objectify (I<$tid> => I<$some_data>, ...); |
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This method stores actually the data. It takes a hash, with the topic id as keys and according |
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values and tries to find for each of the pairs an appropriate storage. If none can be found, it will |
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raise an exception. |
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B: Yes, this is a stupid name. |
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=cut |
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sub objectify { |
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my $self = shift; |
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my $storages = $self->{'.storages'}; |
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my %bs = @_; |
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OBJECT: |
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while (my ($tid, $obj) = each %bs) { # go through the parameter list |
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foreach my $store (@$storages) { # now look at all registered storages |
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next OBJECT if $store->{$tid} = $obj; # find the one which actually stores it (by returning the value) |
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} |
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die "no storage dispatched for $tid"; # if no storage found itself => exception raised |
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} |
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} |
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=pod |
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=item B |
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I<$tm>->deobjectify (I<$tid>, ...) |
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This method removes any data stored for the provided topic(s). If no data can be found in the |
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appropriate storage, an exception will be raised. |
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=cut |
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sub deobjectify { |
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my $self = shift; |
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my $storages = $self->{'.storages'}; |
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OBJECT: |
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foreach my $tid (@_) { # go through the parameter list |
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foreach my $store (@$storages) { # now look at all registered storages |
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next OBJECT if delete $store->{$tid}; # find the one which actually stored it (by returning the value) |
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} |
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die "no storage dispatched for $tid"; # if no storage found itself => exception raised |
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} |
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} |
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=pod |
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=item B |
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I<@objects> = I<$tm>->object (I<$tid>, ...) |
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This method returns any data stored for the provided objects. If no data can be found for a |
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particular topic, then C will be returned. |
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=cut |
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sub object { |
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my $self = shift; |
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my $storages = $self->{'.storages'}; |
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my @os; |
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foreach my $tid (@_) { |
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my $o; |
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foreach my $store (@$storages) { # now look at all registered storages |
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($o = $store->{$tid}) and last; # find the one which actually stored it (by returning the value) |
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} |
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push @os, $o; |
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} |
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return @os; |
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} |
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=pod |
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=back |
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=head1 SEE ALSO |
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=head1 AUTHOR INFORMATION |
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Copyright 20(10), Robert Barta , All rights reserved. |
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This library is free software; you can redistribute it and/or modify it under the same terms as Perl |
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itself. http://www.perl.com/perl/misc/Artistic.html |
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=cut |
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our $VERSION = 0.1; |
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1; |
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__END__ |