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At runtime, one or more nodes (JVMs) running one or more TIBCO BusinessEvents inference agents process the incoming events using a Rete network as the inferencing engine, and a set of rules that are triggered by conditions in incoming events. One or more event stream processing query agents can query incoming events.
TIBCO BusinessEvents Express Content relating to Cache OM and backing store is not relevant to TIBCO BusinessEvents Express edition.
• Rules Evaluation and Execution based on the state and value of objects and incoming events. This functionality is achieved using one or more inference agents configured with the appropriate rules. Each inference agent executes rules using one or more Rete networks to optimize performance and provide rule inferencing capabilities.
• Lifecycle Management of Objects and Events including distribution, clustering, persistence and recoverability. Various options are available to achieve the functionality appropriate for business needs: in-memory only storage of objects, use of a cache, and addition of a backing store (database). shows Cache object management.Information from enterprise applications and other sources flows into TIBCO BusinessEvents through channels as messages. Messages represent the events that TIBCO BusinessEvents processes based on event definitions (event types). Events can be filtered (ignored), preprocessed into concepts or cached concepts, or asserted into the rule engine's working memory. In an inference agent, all the rules whose conditions match information in the events (as well as concepts, if specified in the rule conditions) are assembled into a rule agenda and the first rule executes. If a rule successfully executes, its rule actions create and modify the objects in working memory. The rule agenda is derived from an internal runtime memory structure known as a Rete network (because it uses a derivative of the Rete algorithm).TIBCO BusinessEvents rule engine is a forward-chaining inferencing engine. Every time the facts (concepts, score cards, and events) in its working memory change — due to rule actions or the arrival of new events — the inferencing engine updates the rule agenda. As a result, new rules are available to execute while others are now unavailable. The selection of which rule to execute first from a choice of several is called conflict resolution. The agenda process repeats until there is no more new information to process. This is known as RTC, or run to completion. See Understanding Conflict Resolution and Run to Completion Cycles for more details.
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Copyright © TIBCO Software Inc. All Rights Reserved |