15 May 2007 Phillip Warner : NOAO : IVOA Interop1 NOAO VOEvent Services and Clients Phillip Warner, Rob Seaman, Chris Smith NOAO T HE US N ATIONAL V IRTUAL O BSERVATORY

15 May 2007 Phillip Warner : NOAO : IVOA Interop2 Purpose NVO Research Initiative –Publish events from ESSENCE survey at NOAO Type Ia SN search and follow-up –~200 over a five-year period –Redshift 0.15 to 0.75 –VRI photometry supplemented with observations from Keck, MMT, Magellan, Gemini and VLT collaboration with Alasdair Allan and RoboNet-1.0 to follow-up brighter SNe photometrically Another run coming up this fall

15 May 2007 Phillip Warner : NOAO : IVOA Interop3 Purpose NVO Research Initiative –Create supporting software infrastructure Authoring client Publisher Repository Relay Subscription client Goals –Configurable –Extensible –Distributable

15 May 2007 Phillip Warner : NOAO : IVOA Interop4 Technologies Used JBoss –EJB 3.0 as DAO –Hibernate (JPA) as ORM –PostgreSQL for database backend Tomcat –Spring MVC for ease of configuration vTCP –v = vanilla, or length protocol Specify length of packet, then packet data

15 May 2007 Phillip Warner : NOAO : IVOA Interop5 Components : Author Event submission Tomcat –Current implementation Spring MVC for configurability Currently basic submission –You write the packet –Copy/paste into web form –Near future Better web form Standalone client using an API

15 May 2007 Phillip Warner : NOAO : IVOA Interop6 Components : Publisher Accepts events from authors –Event packet validation –ID generation Current implementation –Hibernate/PostgreSQL Goal is configurability –Support for multiple event sources Near-term support includes ESSENCE events only Longer-term –support multiple event sources

15 May 2007 Phillip Warner : NOAO : IVOA Interop7 Components : Repository Event storage –Enable query support Current implementation –Simple repository Minimal metadata Near future –A bit more complex than simple Support for queries

15 May 2007 Phillip Warner : NOAO : IVOA Interop8 Components : Relay Event forwarding Current implementation –Independent socket implementation vTCP vanilla backbone communication Near future? –basically finished

15 May 2007 Phillip Warner : NOAO : IVOA Interop9 Components : Subscriber Listening for events Current implementation –Simple, uses vTCP Near future –RSS –Configurable subscriptions Server-side filtering

15 May 2007 Phillip Warner : NOAO : IVOA Interop10 Configurable Spring MVC –Configuration through XML –No coding required Assumes valid and proper implementation Spring container deployment Mix-and-match components –Deploy only those services you need

15 May 2007 Phillip Warner : NOAO : IVOA Interop11 Extensible API for plugins –Requires further iteration, but the concept and capability exists Interface-based –Replace distributed components with custom components

15 May 2007 Phillip Warner : NOAO : IVOA Interop12 Distribution and Future Work Will provide full access to source and binaries and API documentation – Future work –Decouple further from specific technologies JBoss and (maybe) Tomcat Support for other databases (simple)s –Rich clients Authors Subscription clients