@Factory and @DataModel on the same method

[fabricio.lemos]

Is it possible to have @Factory and @DataModel on the same method?

At first I had this class:

@Stateful
@Name("displayUseCases")
@Scope(ScopeType.EVENT)
public class DisplayUseCasesAction implements DisplayUseCases {

 @EJB
 private UseCaseBsn useCaseBsn;

 @DataModel (scope = ScopeType.PAGE)
 private List<UseCase> useCaseList;

 @Factory("useCaseList")
 public void initUseCaseList() {
 useCaseList = useCaseBsn.getAll();
 }

 @Destroy @Remove
 public void destroy() { }

But, to avoid declaring a variable that was not used, I changed it to:

@Stateful
@Name("displayUseCases")
@Scope(ScopeType.EVENT)
public class DisplayUseCasesAction implements DisplayUseCases {

 @EJB
 private UseCaseBsn useCaseBsn;

 @DataModel (scope = ScopeType.PAGE)
 @Factory("useCaseList")
 public List<UseCase> getUseCaseList() {
 return useCaseBsn.getAll();
 }

 @Destroy
 @Remove
 public void destroy() { }
}

After changing it, the application runs ok but I get the exception:
20:44:31,894 WARN [Contexts] Could not destroy component: displayUseCases
javax.ejb.EJBNoSuchObjectException: Could not find Stateful bean: a5k2v46-y6may6-ezbt3tyr-1-ezbun2fe-10

even doing the things stated at:
http://wiki.jboss.org/wiki/Wiki.jsp?page=JbossTimeoutSettingForSeam

thanks in advance,
Fabrício Lemos

[pmuir]

This is bad idea. How is Seam to know whether you want a DataModel or a List when you access the useCaseList context variable?

[tony.herstell1]

> javax.ejb.EJBNoSuchObjectException: Could not find Stateful bean: a5k2v46-y6may6-ezbt3tyr-1-ezbun2fe-10

I get lots of these.. never seems to break anything and it's only when beans are timing out.

If you find out how to get rid of these then please tell me.

:/

[tony.herstell1]

Is this allowed then?


@DataModel
private Organisation[] organisations;


/*
* Methods
*/
@Factory("organisations") // Is run whenever this bean is created (we know its going to be the "All" query.
public void initOrganisations() {
log.info("> initOrganisations");
applyAllQuery();
log.info("< initOrganisations");
}

??

[pmuir]

Yes, thats correct :)

[fabricio.lemos]

"petemuir" wrote:
This is bad idea. How is Seam to know whether you want a DataModel or a List when you access the useCaseList context variable?

It really makes sense. Thank you.

[fabricio.lemos]

"fabricio.lemos" wrote:

"petemuir" wrote:
This is bad idea. How is Seam to know whether you want a DataModel or a List when you access the useCaseList context variable?

It really makes sense. Thank you.

I was looking on others datamodels that I have and got I little more confusing. I found this method:

 @DataModel
 public List<Step> getStepList(){
 return useCase.getSteps();
 }

And the dataTable that reads the DataModel:

<h:dataTable value="#{stepList}" var="stepVar">
 <h:column>
 <f:facet name="header">Name</f:facet>
 #{stepVar.name}
 </h:column>
 <h:column>
 <f:facet name="header">Edit</f:facet>
 <h:commandLink value="Edit" action="updateStep" />
 </h:column>
</h:dataTable>

I do not know how Seam knows if it is a DataModel or a List when stepList is accessed, but it works pretty fine, also injecting the selected entity through a @DataModelSelection annotation.

[pmuir]

There's no @Factory on that method. So, each time the stepList context variable is used, the getStepList method will be run (and the result fed through @DataModel)