NAME

RDF::Query::Plan::Service - Executable query plan for remote SPARQL queries.

VERSION

This document describes RDF::Query::Plan::Service version 2.919.

METHODS

Beyond the methods documented below, this class inherits methods from the RDF::Query::Plan class.

new ( $endpoint, $plan, $silent, $sparql, [ \%logging_keys ] )

Returns a new SERVICE (remote endpoint call) query plan object. <$endpoint> is the URL of the endpoint (as a node object). <$plan> is the query plan representing the query to be sent to the remote endpoint (needed for cost estimates). <$sparql> is the serialized SPARQL query to be sent to the remote endpoint. Finally, if present, <%logging_keys> is a HASH containing the keys to use in logging the execution of this plan. Valid HASH keys are:

* bf - The bound/free string representing C<<$plan>>

new_from_plan ( $endpoint, $plan, $context )

Returns a new SERVICE query plan object. <$endpoint> is the URL of the endpoint (as a string). <$plan> is the query plan representing the query to be sent to the remote endpoint. The exact SPARQL serialization that will be used is obtained by getting the originating RDF::Query::Algebra object from <$plan>, and serializing it (with the aid of the RDF::Query::ExecutionContext object <$context>).

execute ( $execution_context )

next

close

endpoint

sparql

Returns the SPARQL query (as a string) that will be sent to the remote endpoint.

lhs

silent

Returns a boolean value indicating whether the service plan will ignore errors.

pattern

Returns the query plan that will be used in the remote service call.

distinct

Returns true if the pattern is guaranteed to return distinct results.

ordered

Returns true if the pattern is guaranteed to return ordered results.

plan_node_name

Returns the string name of this plan node, suitable for use in serialization.

plan_prototype

Returns a list of scalar identifiers for the type of the content (children) nodes of this plan node. See RDF::Query::Plan for a list of the allowable identifiers.

plan_node_data

Returns the data for this plan node that corresponds to the values described by the signature returned by plan_prototype.

graph ( $g )

explain

Returns a string serialization of the query plan appropriate for display on the command line.

AUTHOR

Gregory Todd Williams <gwilliams@cpan.org>