[jboss-user] [JBoss Seam] - Re: Stop the violence! How should we be separating our beans

gavin.king@jboss.com do-not-reply at jboss.com
Thu Mar 29 14:56:12 EDT 2007

Ahem, there's no right or wrong way.

Option 2 has the (big) advantage that it requires less code.

Option 1 has the advantage that the business logic is not coupled to FacesMessages, which means that it would be reusable as a WS or whatever.

So it really depends on asking yourself the question: "how likely is it that I'm going to need to use this functionality from something other than JSF in the next 6 months?"

And, or course, that's often a very difficult problem to answer. However, if you don't have a great answer, notice that with modern refactoring tools, it is really not that difficult to get from 2 to 1 if and when you need to do it. In fact, its only arguable that there is less work to do 1 immediately rather than do 2 now and then refactor to get to 1 (if and when you need it).

I strongly believe that it's usually much more important to get *working functionality now*, than it is to plan for stuff that might or might not happen in 6 months or a year or two years. Deliver useful stuff ASAP, secure ongoing funding for your project, and ongoing cooperation, trust and feedback from your users. Then in 6 months time when you really need it, you'll be able to do the refactorings you really need, with a lot less pressure, and a lot more knowledge.

BTW, there is always Option 3:

<rule if="#{addressmanager.addressChangeAllowed}">
  |     <redirect view-id="/addressChanged.xhtml">
  |         <message>The address was changed.</message>
  |     </redirect>
  | </rule>
  | <rule if="#{not addressmanager.addressChangeAllowed}">
  |     <render view-id="/changeAddress.xhtml">
  |         <message>The address can not be changed.</message>
  |     </render>
  | </rule>
  |   | 
  |   | But I understand that this is not to all tastes ;-)
  |   | 

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