NAME

RDF::Trine::Store::AllegroGraph - Triple store implementation based on AGv4

SYNOPSIS

    use RDF::Trine::Store::AllegroGraph;
    my $trine = RDF::Trine::Store->new_with_string( "AllegroGraph;http://ag_server:10035/scratch/catlitter" );

    # use the RDF::Trine::Store API

DESCRIPTION

This package implements the RDF::Trine::Store API on the basis of the AllegroGraph v4 Perl client.

You will almost never invoke any of the functions/methods here directly, but will peruse the Trine invocation stack. The only exception for that are those things which an AGv4 repository offers, but are not covered by the Trine API. These are, among other things:

• Prolog rule based querying

• sessions and transactions

• geo-spatial support

• social network analysis

For these I suggest that you pull out the AGv4 repository from the trine store like this:

   my $repo = $store->{model};
   my $result = $repo->prolog ("....");

NOTE: This will probably change as RDF::Trine evolves.

Restrictions/Shortcomings

For the time being this will not be fast, and that for a number of reasons.

This store has native support for SPQARL 1.0. You should be able to use SPARQL 1.1 as that will be intercepted by the Trine framework. It will be slow, though, as it will be pulling statements individually. To handle this properly will be future work.

INTERFACE

Constructor(s)

Are essentially those from RDF::Trine::Store with the following flavor:

_new_with_object accepts one RDF::AllegroGraph::Repository4 object.

That will be wrapped into the store and used from then on.

_new_with_string accepts a string of the following form:

   AllegroGraph;<HTTP-address-of-server>/<catalog-name>/<repository-name>

such as

   AllegroGraph;http://super:super@127.0.0.1:10035/test/experiment

NOTE: If the repository does not exist, it will be generated (that usually takes a bit of time with AG).

_new_with_config accepts a hash with the following fields:

storetype

must be AllegroGraph

server

must be an HTTP URL of the server (excluding trailing slash), defaults to http://127.0.0.1:10035

catalog

must be an identifier of the form /something

repository

must be an identifier of the form /somethingelse

username

is used for authentication

password

ditto

Methods

temporary_store

This is not implemented as we need serious information to actually create a repository (and to get rid of it eventually).

TODO: As additional parameters could provide this information, one could use that.

supports

Currently this store supports the following features:

http://www.w3.org/ns/sparql-service-description#SPARQL10Query

I.e. SPARQL 1.0 queries can be directly funneled into here.

get_sparql

If you pass in a string holding a SPARQL query, then you will get back an RDF::Trine::Iterator::Bindings iterator.

count_statements

As the mother class commands.

add_statement

As the mother class, but:

• We do not check for duplicates here. I.e. you can add any number of identical triples. They will not show up in your SPARQL results, but with get_statements they will.

• Quads are not (yet) supported.

remove_statement

Same as mother class.

NOTE: No quads yet. And this does not work within bulk mode (yet).

remove_statements

See remove_statement

get_statements

As the mother class.

get_contexts

For now, this always will return an empty list.

TODO: When Perl AG supports more context features this will change.

size

As for the mother class, but remember that AG allows you to hold duplicates.

etag

Not implemented. Will die.

_begin_bulk_ops, _end_bulk_ops

Currently bulk operation is only supporting adding statements. Not deleting them.

AUTHOR

Robert Barta, <drrho at cpan.org>

BUGS

Please report any bugs or feature requests to bug-rdf-trine-allegrograph at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=RDF-Trine-AllegroGraph. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SEE ALSO

RDF::Trine::AllegroGraph

ACKNOWLEDGEMENTS

The development of this package was supported by Franz Inc.

COPYRIGHT & LICENSE

Copyright 2011 Robert Barta, all rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.