perfsonar development work

[Maciej Glowiak <>]

Herbert Souza wrote:
> Hi Andreas, Martin and Maciej
>
> I would like to know the status of the Multi-LS. I have an old file (.doc) 
> with the definition of the service; are
> there new documents?
>
> In “List of Potential Issues” of Brazil meeting you said this: “LS Proxy 
> service - service that could translate
> symbolic queries to pre-defined XQuery”. I didn’t understand what is “symbolic 
> queries”. What does “symbolic queries” mean? Recently I made a class called 
> “proxy.java”, to ease the access to LS, Is it same?. In the attachments you can find 
> one method of this class that find the service by parameter in "psservice" 
> tag.

Hi Herbert,

LS Proxy service - that's something we (you and me) were writing about a 
long time ago. As far as I remember you mentioned that a set of 
pre-defined queries to the LS should be established - in order to avoid 
making XQuery expressions. Then you wanted to do it inside LS, but it'd 
limit the functionality of the LS, so I didn't agree.

Then the topic returned during the perfSONAR Meeting in Ann Arbor in 
April 2006 (it was mentioned and discussed a bit by Jeff, Fausto and me).

Finally, I decided to put it into the agenda, because it could help 
client developers (and other service programmers) to develop their 
application in easier way.

"symbolic queries to pre-defined XQuery" means:

Communication

   client ----> LS Proxy -----> LS
   client <----(LS Proxy)<----- LS

client sends for example:

--------------------------------------------------------
   query: give_metadata_for
   parameter: serviceType=MA
--------------------------------------------------------
/of course that's an example and the query 'language' may be different 
but 'give_metadata_for' means predefined query such as:/

which will be translated to:

--------------------------------------------------------
   declare namespace nmwg = http://....;
   declare namespace psservice = http://....;

   for i in /nmwg:store[type='LSStore']/nmwg:metadata
   let $s:=$i/nmwg:subject/psservice:service
   where $s/psservice:serviceType = 'MA'
   return $i;
--------------------------------------------------------

and sent to LS.

Maciej



> In attachment you can also find a document
> (UDDI_DOC.doc) with my UDDI experience, where I made an adaptation in the use
> of the UDDI to interoperate with perfSONAR. This development has an initial
> version, but it still with some errors and it isn´t in conformance with the 
> NMWG
> messages at all (like the ID). 
>
> I hope
> that this work to contribute with the LS or in the development of the 
> Multi-LS.
> I´m also waiting for comments about this document attached.
>
>
>
>
> thanks for all.
>
>
>
>
>
>
> public Document find_psservice(String accessPoint, String psservice, String 
> parameter) throws SystemException{
>         
>         Document result = null;
>         try{
>             
>             String query = "declare namespace nmwg=\"http://ggf.org/ns/nmwg/base/2.0/\";\n"+
>               "declare namespace 
> perfsonar=\"http://ggf.org/ns/nmwg/tools/org/perfsonar/1.0/\";\n"+
>               "declare namespace 
> psservice=\"http://ggf.org/ns/nmwg/tools/org/perfsonar/service/1.0/\";\n"+
>               "declare namespace xquery=\"http://ggf.org/ns/nmwg/tools/org/perfsonar/service/lookup/xquery/1.0/\";\n"+            
>
>               "for $x in 
> /nmwg:store/nmwg:metadata/perfsonar:subject/psservice:service\n"+
>               "where contains($x/psservice:"+psservice+", 
> \""+parameter+"\")\n"+
>               "return $x\n";
>             
>             
>             LSQueryRequestGenerator queryRequest = new LSQueryRequestGenerator(query,"service.lookup.xquery");
>             Service service = new Service(); 
>             Call call = (Call)service.createCall();
>             call.setTargetEndpointAddress(new URL(accessPoint));
>             call.setOperationName(new 
> QName("http://soapinterop.org/","submit";));
>             Message Mem = queryRequest.generateRequest();
>         
>             //convert response Message into Document
>             Document responseDocument = XMLUtils.
>                    convertMessageToDOM( Mem );
>         
>             //build a SOAPBodyElement from the document
>             //printXML(responseDocument);
>        
>             SOAPBodyElement requestMessage = 
>                 new SOAPBodyElement(responseDocument.getDocumentElement());
>        
>             //call on the end point 
>             Object resultObject = call.invoke(new Object[] {requestMessage});        
>        
>         //get the document
>         SOAPBodyElement resultSBE;
>         resultSBE = (SOAPBodyElement)((Vector)resultObject).get(0);
>        
>         //set result
>         result = resultSBE.getAsDocument();
>         printXML(result);
>            
>     }catch(Exception e) {
>         System.out.println("Proxy " +e);
>     }
>        return result;
> }    
>
>
>
>
>
> -------------------------------
> Herbert Monteiro Souza
>
> Cel Phone: +5571 88029549
> Phone: +5571 33304658
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