High-level constructs in the READY event notification system
Robert E. Gruber, Balachander Krishnamurthy, Euthimios Panagos · 1998
This paper describes high-level constructs (operating over multiple events, multiple consumers, etc.) provided by READY, an event notification system being developed at AT&T Labs [7]. Entities in the READY model include: consumer specifications that match over both single and compound event patterns; communication sessions that manage quality of service (QoS) and ordering properties for event delivery; grouping constructs for both specifications and sessions; event domains and boundary routers that bound the scope of event distribution and control the mapping of events across domains. The result is a more powerful and flexible event service. The remainder of the paper is organized as follows. Section 2 offers an overview of related systems. In Section 3, we focus on client interactions with READY. Section 4 introduces READY event types. Section 5 describes specifications, which control the actions performed by READY servers due to supplied events. Section 6 describes constructs for managing boundaries between event domains. Finally, Section 7 discusses the current status of READY as well as some general issues raised by our work. We are in the process of completing an initial implementation of READY. At the same time we are exploring the merits of READY's high-level constructs by using READY as a core component of a unified messaging system [2]. Some of the examples presented here are taken from that domain. 2 Related Work