Promotion from a Simple, Anonymous Signal to a Business Event

CEP processes up to thousands of signals and low-level events per second. CEP applications filter, aggregate, and analyze those events to produce a far smaller number of facts that are truly meaningful at the level of human operators or the business processes. In the situation we have discussed in the previous section, where hundreds of temperature sensors post their readings with a JMS queue, the Complex Event Processor distills two new streams of events:

• Average, consolidated TemperatureFindings per sensing unit and per half-minute

• FailedDetectorEvents that are sent whenever a sensor is found to be absent for 30 seconds in a row