Predefined Query Example: Locked Resources

In this example an Architecture Management service provider provides a pre-defined query to find all resources that are locked. Since locking and other resource life cycle management capabilities are beyond the scope of the current OSLC specifications, such a query can only be specified as an internal query by the service provider. This specific example does not specify a resource shape for the query, and hence is executed without parameters.

The query parameters on the service call however are still applicable.

The service provider in this example includes the follow resource definition in it service provider document:

<rdf:RDF 
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:dcterms="http://purl.org/dc/terms" 
  xmlns:oslc="http://open-services.net/ns/core#"
  xmlns:oslc_am="http://open-services.net/ns/am#">

  <oslc:ServiceProvider rdf:about="http://example.com/am-provider/Project+X">

   <dcterms:title>Project X AM Provider</dcterms:title>
   <oslc:service>

     <oslc:Service>
      <oslc:domain rdf:resource="http://open-services.net/ns/am#" />

       <!-- other properties omitted for clarity -->    

      <oslc_am:predefinedQuery>
        <oslc_am:PredefineQuery>
           <dcterms:title>Locked Resources Query</dcterms:title>
           <dcterms:description>Returns all the currently locked resources.</dcterms:description>
           <oslc:queryUrl rdf:resource="https://example.com/am-provider/Project+X/query/locked" />
         </oslc_am:PredefineQuery>
      </oslc_am:predefinedQuery>

     </oslc:Service>

   </oslc:service>

  </oslc:ServiceProvider> 
</rdf:RDF>

The client executes a POST (or in this case since there is no resource shape specified for the query parameters a GET) call on the queryUrl.

Request

GET https://example.com/am-provider/Project+X/query/locked HTTP/1.1

Accept: application/rdf+xml
OSLC-Core-Version: 2.0

Response

HTTP/1.1 200 OK

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:dcterms="http://purl.org/dc/terms/"
  xmlns:oslc="http://open-services.net/ns/core#">

  <oslc:ResponseInfo
   rdf:about="https://example.com/am-provider/Project+X/query/locked">

   <dcterms:title>Locked Resources</dcterms:title>
   <oslc:totalCount>4</oslc:totalCount>

  </oslc:ResponseInfo>

  <rdf:Description
   rdf:about="https://example.com/am-provider/Project+X/query/locked">

   <rdfs:member rdf:about="http://am.acme.com/resources/res42" />
   <rdfs:member rdf:about="http://am.acme.com/resources/res123" />
   <rdfs:member rdf:about="http://am.acme.com/resources/res456" />
   <rdfs:member rdf:about="http://am.acme.com/resources/res89" />

  </rdf:Description>

</rdf:RDF>