decision-state vs action-state

[JohnTheDroider]

I am reading up and dont understand the diff of decision-state vs action-state. I understand that view-state will display a jsp for input but whats the diff of decision-state vs action-state?

why should I use decision-state over a action-state?
why should I use a action-state over a decision-state?

Can someone shot some light on this

[jsimas]

Use decision states to evaluate logic to decide wich view or action state should be executed (if else logic)

Action-state to process. Call a webservice, execute a database call, process a file, etc...

I'll give you an example:

<decision-state id="decideIfEmailShouldBeSent">
<if test="someService.someLogicThatreturnsBoolean()" then="sendEmail" else="writeEntryInDbAndDoNothing" />
</decision-state>

<action-state id="sendEmail">
<evaluate expression="emailService.sendEmail()" />
<transition on="next" to="nextView" />
</action-state>

<view-state id="writeEntryInDbAndDoNothing">
<on-entry>
<evaluate expression="repository.writeSomething()" />
</on-entry>
<transition on="next" to="nextView" />
</view-state>

As you can see, is this example i even mixed view-state with action-state.

Best Regards

[JohnTheDroider]

thanks for the post.. it was a stupid question but sometimes until you see the question and anwser you are like hmmmm