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Payload Extractor Pattern

 
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Hi,

I was going through Payload Extractor pattern in Real World Java EE Patterns Rethinking Best Practices Adam Bien Book, the following code found.

MDB Bean class:



PayLoad Extractor Class:



the question is Logic of Payload extractor (extracting messages and invoke consume method) can be done in onMessage method itself. What is the use of this pattern?, i dont find any value added using this approach, can anyone please explain better?
 
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@Interceptors(PayloadExtractor.class)



First I would look at the purpose of @Interceptors
or what is use of intercepting a message payload in general?
 
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