[jboss-user] [JBoss Seam] - Starting arbitrary jPDL pageflows from a

[IGx89]

Say I have the following jPDL pageflows:
PF1: page1.xhtml -> page2.xhtml
PF2: page1.xhtml -> page3.xhtml
PF3: page4.xhtml -> page5.xhtml

What I want to happen is that when the user goes to "controller.seam?flow=PF?", they'll automatically be redirected to the right page and start the right flow. Unfortunately, though that seems a simple task, in reality it's a big pain to do.

Ideally, I'd like to be able to do:

  | 	<page view-id="/controller.xhtml" action="#{controller.getFlow}">
  | 		<param name="flow" value="#{controller.flow}" />
  | 
  | 	    <navigation>
  | 	        <rule if-outcome="PF1">
  | 	            <begin-conversation join="true" pageflow="PF1" />
  | 	        </rule>
  | 	        <rule if-outcome="PF2">
  | 	            <begin-conversation join="true" pageflow="PF2" />
  | 	        </rule>
  | 	        ...
  | 	    </navigation>
  | 	</page>
  | (even that in an ideal world would be more concise, as you can most likely envision)

However, that doesn't work! If the pageflow has a <start-page> node, Seam doesn't like that its view-id is different than the current page (the controller). If the pageflow has a <start-state> node (automatically going to the first page in the flow), Seam complains that it can't do that while in a RENDER_RESPONSE phase.

It would seem the following might get around those issues (though add even more duplicate code):

  | 	        <rule if-outcome="PF1">
  | 	            <redirect view-id="page1.xhtml" />
  | 	            <begin-conversation join="true" pageflow="PF1" />
  | 	        </rule>
  | 

However, that doesn't work either! Seam doesn't allow multiple elements inside a rule element.

Currently, I'm solving the problem by doing the following; it works, but has lots of ugly duplication (antithema to Seam's goals):

  | 	<page view-id="/controller.xhtml" action="#{controller.getFlow}">
  | 		<param name="flow" value="#{controller.flow}" />
  | 
  | 	    <navigation>
  | 	        <rule if-outcome="PF1">
  | 	            <redirect view-id="/page1.xhtml" />
  | 	        </rule>
  | 	        <rule if-outcome="PF2">
  | 	            <redirect view-id="/page1.xhtml" />
  | 	        </rule>
  | 	        <rule if-outcome="PF3">
  | 	            <redirect view-id="/page4.xhtml" />
  | 	        </rule>
  | 	    </navigation>
  | 	</page>
  | 	
  | 	<page view-id="/page1.xhtml" action="#{controller.getFlow}">
  | 	    <navigation>
  | 	        <rule if-outcome="PF1">
  | 	            <begin-conversation join="true" pageflow="PF1" />
  | 	        </rule>
  | 	    </navigation>
  | 	</page>
  | 
  | 	<page view-id="/page1.xhtml" action="#{controller.getFlow}">
  | 	    <navigation>
  | 	        <rule if-outcome="PF2">
  | 	            <begin-conversation join="true" pageflow="PF2" />
  | 	        </rule>
  | 	    </navigation>
  | 	</page>
  | 
  | 	<page view-id="/page4.xhtml" action="#{controller.getFlow}">
  | 	    <navigation>
  | 	        <rule if-outcome="PF3">
  | 	            <begin-conversation join="true" pageflow="PF3" />
  | 	        </rule>
  | 	    </navigation>
  | 	</page>
  | 

Should I submit a feature request for a solution to this issue?

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