Hi Davanum,
In our search for a Champion and Sponsor for the Poloka proposal http://wiki.apache.org/incubator/PolokaProposal We looked into the Savan, ServiceMix, Axis2, and MUSE projects. We find that it makes most sense, so far, to have Poloka as a project under Axis2. It also makes sense to go into the ServiceMix, that implements WS-Notification already, but objectives of ServiceMix and POLOKA are somewhat different in respect to POLOKA goal to provide a stand-alone reference implementation of the spec. Bringing entire ServiceMix in the picture might be too much. However ServiceMix could benefit from the POLOKA work in the future. Poloka (http://poloka.org) could create an Axis2 module implementing handlers creating a messaging network for a federation of Axis2 servers. This way we would be able to support - Standalone WS-Notification compliant notification producer and notification consumer - Standalone WS-BrokeredNotification broker - Federation of WS-BrokeredNotification brokers. It would make sense to integrate Savan functionality within Poloka as time goes but not other way around. I think so because Poloka objective is broader than Savan objective in respect to: - Broker support Broker support is defined in WS-Notification and not in WS-Eventing. Although it is possible that once a broker with WS-Eventing interface is created, the picture might change. - Subscription WS-Eventing defines subscription language based on XPath (content-based semantic). WS-Notification defines subscription Filers using Topic Dialects (topic-based semantic), XPath over message content (content-based semantic, same as in WS-Eventing), and resource properties (optional and unclear semantics, needs refinement in the spec). - Matching performance It seems that we can improve performance of XPath matching based on the research done by the PADRES http://research.msrg.utoronto.ca/pub/Padres project. It would be equally applicable to WS-Notification and WS-Eventing. Naweed Tajuddin, a Master student of Prof. Arno Jacobsen, is looking specifically into this issue for his master thesis. What do you think? We are looking for the input and guidance of the Apache community in moving the POLOKA proposal forward. Please help! Regards Serge
