Event Driven Publish-Subscribe Implementation Ideas

Some ideas for impementing publish-subscribe event notification:

• Event Notification with Apache Camel. Cons: hardcoded channel names, no seda pubsub channel before Camel 2.1. Pros: many endpoints.
  
• Spring Integration. Cons: Require Spring Integration, hardcoded channel names, has explicit pubsub channel. Pros: Simpler API than Camel, integration with Spring.
• Mule...
  
• EventBus. Seems to be an excellent approach.
  
• Spring-wired listener List
  
• Simplifying event listeners with generics
• Spring AOP for dynamic listeners
  
• AspectJ for compile-time weaving dynamic listener infrastructure
  
• ELF (Event Listener Framework)