[jboss-dev-forums] [Design of JBoss ESB] - Re: MessageType design

[mark.little@jboss.com]

"kurt.stam at jboss.com" wrote : It looks like we copied the JMS message types of: BytesMessage, MapMessage, ObjectMessage, StreamMessage and TextMessage
  | 

Not quite. There's no StreamMessage.

anonymous wrote : 
  | I see the following issues with the current implementation:
  | 
  | 1. There are no interfaces for them in our implementation, so our Message
  | will not actually 'be' one of these types. You'll have to do Message.getPayload() and then figure out what type this it by using getInstanceOf().
  | 

There's no such operation Message.getPayload. You mean Payload.getPayload, I think.

But yes, that's essentially correct. Without changing interfaces to existing infrastructure (and potentially breaking existing deployments), these simply represent different views on to the underlying Message Body contents.

anonymous wrote : 
  | 2. We have left the old body implementation, so we have a body and a payload-body as I understand it. This is confusing. I mean I can still do msg.getBody.add("kurt", "Stam") and ignore the new payload stuff.
  | 

We cannot remove Body because it is the underlying Message structure that supports more than any of these views allow. It's more powerful. These are simplifications for users who know they only want to send text, Serialized objects etc.

anonymous wrote : 
  | 3. CommandMessage is listed at the same level as BytesMessage, but I think a CommandMessage is more at the ESB logical level. It has nothing to do with the implementation of the message. Maybe we can simple add
  | a Message.property of MESSAGE_TYPE for this? No need to have a different API for this type of message.
  | 

Possibly. It's just another simplification view. At present it supports type (what type of CommandMessage) and a serialized object. Since we don't have any of these CommandMessage implementations yet, it's hard to argue for or against.

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