Do you mean WebLogic Integration Event Generator? As I know, WebLogic Integration does not supported now and Oracle SOA Suite is a recomended replacement for this one. Oracle SOA Suite contains a Event Delivery Network - the new technology for Event Driven Architecture implementation. But you wan't use Oracle SOA Suite and EDN.
You can use Open Source solutions, i.e. Guava EventBus. Or you can implement EDN alternative themself (EDN based on Oracle AQ, but can work on JMS message infrastructure, you can emulate events using any messages and JMS Topic for subscribing on that "events").