Implementing VOSpace 1.0 without Axis

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Presentation transcript:

Implementing VOSpace 1.0 without Axis THE US NATIONAL VIRTUAL OBSERVATORY Implementing VOSpace 1.0 without Axis Matthew J. Graham (Caltech, NVO) IVOA Beijing: Grid & Web Services 1 14 May 2007

IVOA Beijing: Grid & Web Services 1 Architecture Metadata store Web service Data server Data IVOA Beijing: Grid & Web Services 1 14 May 2007

IVOA Beijing: Grid & Web Services 1 Infrastructure Preserve XML as much as possible XMLBeans (xmlbeans.apache.org): open source XML-Java binding tool based on StAX spec. full XML Schema support and full XML Infoset fidelity parse and generate XML documents that conform to the schema XFire (xfire.codehaus.org): next-generation Java SOAP framework built on StAX spec. XMLBeans support Virtuoso (virtuoso.openlinksw.com/wiki/main): object-relational database for SQL, XML and RDF supports SQL, XQuery and SQARQL XML Infoset filelity: When unmarshalling an XML instance the full XML infoset is kept and is available to the developer. This is critical because because of the subset of XML that is not easily represented in Java. For example, order of the elements or comments might be needed in a particular application. More powerful and flexible than traditional binding tools. IVOA Beijing: Grid & Web Services 1 14 May 2007

IVOA Beijing: Grid & Web Services 1 Implementation Web service: run as standalone service (using embedded Jetty) or deployed as Java servlet (Tomcat) Metadata store: interfaces for Virtuoso and MySQL HTTP data server: built on Apache HttpCore supports HTTP PUT and GET (v1.1) uses one-time URLs (1 hr lifetime) JPARSS data server: divides data into partitions that are sent over several parallel Java streams simultaneously using X.509 certificates and SSL uses NVO proxy certificates from NCSA MyProxy server Client: simple command-line client to web service and HTTP and JPARSS data servers using Apache Axis 1.2.1 Final JavaScript client for browser use (work in progress) IVOA Beijing: Grid & Web Services 1 14 May 2007

IVOA Beijing: Grid & Web Services 1 Status Deployed at http://nvo.caltech.edu:9090/VOSpaceServiceImpl Shipped as part of NVOSS 2006 and NVO Book software packages Installation guide/tutorial in NVO Book Tested client with ESO VOSpace implementation Untested: WS-Security (XFire/Virtuoso) View conversions WebDAV (reuse VOStore 1.0 code) IVOA Beijing: Grid & Web Services 1 14 May 2007

IVOA Beijing: Grid & Web Services 1 Moving to VOSpace 1.1 Additional node types: Containers: Supported in VOStore 1.0 - reuse business logic Assume Unix logic for “/” and children: /foo vs. /foo/ Issue about container level views - are these transfer formats? Links Just DataNode with no bytes IVOA Beijing: Grid & Web Services 1 14 May 2007