REGISTRY WORKGROUP

Brief: The registry group has been working on a registry query web service, AstroLog, and AstroMQ.

Progress: The registry group has developed a web service, hosted on the MSSL grid server msslxy, that uses XQuery to query a registry.xml file, also held on msslxy. We have developed schemas for queries and query responses, and an IVOA compliant registry schema is in development. In addition, a working AstroMQ and AstroLog using OpenJMS, XMLBlaster, and PostgreSQL. The Log and MQ will be hosted on msslxy ASAP.

Threats: Dummy registry code returning a hard-coded response has been in CVS for a few weeks, but working code was only uploaded yesterday – this has prevented other working groups from having time to set up access to the service. The service directory structure in SOAP needs to be sorted out for simple access calls. Getting MQ and Log running on msslxy requires some complex PostgreSQL configuration that the intrepid workgroup leader is struggling with.

Registry: Submit Query KEY POINTS

• RegistryInterface web service accessible on MSSL server msslxy.

• Registry.xml file is hosted on msslxy.

• Registry is queried using XQuery.

• Registry.xml currently in old format (iteration 1); working on schema to create IVOA-compliant registry.xml file.

• XML response is returned to the portal interface and displayed as HTML.

Registry Submit Query Use Case Diagram

Registry Class Diagram

AstroMQ / AstroLog KEY POINTS

• AstroLog uses OpenJms

• AstroMQ uses XMLBlaster and PostgreSQL

• AstroMQ and AstroLog will be hosted on msslxy.

• Use cases: log message, queue message, get message, get next message

Log Message: Sequence Diagram

Get Logged Message: Sequence Diagram

Get Next Message: Sequence Diagram

Queue Message: Sequence Diagram

Message Processing System: Component Diagram

Message Queue and Log: Class Diagrams

Registry: Submit Query Use Case

1. Portal interface sends a query (formatted to Registry Query Schema) to the RegistryInterface web service.

2. RegistryInterface is deployed as a SOAP service on MSSL server http://msslxy.mssl.ucl.ac.uk:8080/org/astrogrid/registry/RegistryInterface

3. RegistryInterface sends query to parseQuery(query) in QueryParser.

4. QueryParser consults qpParameters.xml to check whether registry source is an XML file or database.

5. If registry is an XML file, parseQuery calls xmlToXQL(query) to convert query to GMD-IPSI-XQL formatted XQuery syntax.

6. QueryParser sends XQL query to Registry.xmlQuery(query).

7. XQL query is executed against registry.xml file. Result is returned to QueryParser.

8. XQL results are send to xqlToXML and converted into an XML-formatted response according to Registry Query Response Schema.

9. XML response is returned to RegistryInterface.

10.XML response is returned to the portal interface and displayed as HTML.