An event and service interacting model and event detection based on the broker/service model

In distributed systems based on B/SM, events and event-condition-action rules are the fundamental metaphors for defining and enforcing the system. Processing entities execute behavior by reacting to and generating new events. It is important that event semantics is explicit. Although a lot of research has concentrated on event semantics, there still exists potential semantic ambiguity which is unacceptable in some circumstances. We propose an event model and incorporate an interaction group identifier into it. We emphasize that the semantics is a key to capture the actual meaning of events in real life, in which the same composite event patterns may imply totally different semantic meanings. Based on this observation, a graph-ESIG (Event and Service Interacting Graph) and ESIC (Event and Service Interacting Chain), which are constructed according to ECA-Rules, are proposed to trace events. ESIG greatly enhanced the expressive power to allow event detection correctly, which matches situations in reality. Finally, we develop a event detection algorithm that uses ESIG and ESIC