How does Esper hook into an existing event-based system?
Today, event based system are often confused with message based system such as JMS and alike back-ends or Enterprise Service Bus (ESB). Messaging system are event based but usually do not correlate events or process event streams at all. They simply process unitary events – and it becomes quickly complex if you need to correlate messages. Esper can hook into any Java based system as a message consumer – whose main purpose would be to listen efficiently to everything whilst sending back other events when a matching condition has occurred. On the other hand, hooking Esper in a classic messaging system allows having it correlate events even if those come from non-Java based systems. This is just an example. Esper is completely container agnostic, can run as a standalone component, and the 1.0 release simply assumes events to be POJO. We are currently working on providing native XML format support as well.
