[seam-dev] Re : SEAMFACES-147 viewActions

[Adrian Gonzalez]

Additionnal thoughts :

As I understand ViewConfigStore for now, any extension can use ViewConfigStore to store about any metadata (event if it's limited to Annotation for the moment).
So this is great for additionnal features.

If we go for solution 4, Page/View will be typed and future extensions will be limited.
We can however add a metadatas field in Page/View for extensions to store about anything in a view.

IMO, solution 4 would make the code easier to understand (more typed) - but breaks a lot of code, and since I'm a newbie here...


________________________________
De : Adrian Gonzalez <adr_gonzalez at yahoo.fr>
À : "seam-dev at lists.jboss.org" <seam-dev at lists.jboss.org>
Envoyé le : Jeudi 27 Octobre 2011 17h44
Objet : [seam-dev] SEAMFACES-147 viewActions

Hello,

I'm working a bit on this issue.

But I'm stuck now and would like to know the better way to continue (sorry to bother once more ;( ).

For the moment I've :
1. registered all viewActionBindings into the viewConfigStore.
2. more or less replicated SecurityPhaseListener functionnality into a ViewActionPhaseListener.

But... viewConfigStore can only store Annotations. I need to store AnnotatedMethod (have a link back to the Method I'll need to call).

I see 4 possible solutions :

 1 - Duplicate ViewConfigStoreImpl to store AnnotatedMethod elements.
 Ugly, no ?
 2 - Make ViewConfigStore manage all kind of AnnotatedElements with a wrapper interface like
interface AnnotatedElement<T> {
Annotation<T> annotation;
Object value;
}
ViewConfigStore :
public interface ViewConfigStore {
public abstract void addAnnotationData(String viewId, AnnotatedElement annotation);
public abstract AnnotatedElement<T> T getAnnotationData(String viewId, Class<T> type);
public abstract List<AnnotatedElement<T>> getAllAnnotationData(String viewId, Class<T> type);
public abstract List<AnnotatedElement> getAllQualifierData(String viewId, Class<? extends Annotation> qualifier);
public <T extends Annotation> Map<String, Annotation> getAllAnnotationViewMap(Class<T> type);
}
3 - ViewConfigStore could store Annotated elements instead of Annotations
 This would make ViewConfigStore usage a little more complicated though.
4 - Have somes typed Page or View objects.
 This need really more reflection since we need to know what is a View (security, view actions, ...).
And it's a big impact on current code.
The ViewConfigStore would be sthing like (really incomplete) :
ViewConfigStore :
public Map<String,ViewInfo> getView(String viewId);
public List<View> getViews();
}
with for instance :
class/interface View {
List<Restriction> getRestrictions();
List<ViewAction> getViewActions(); //or event List<Action> getAction(PhaseId)
}

WDYT ?

P.S. Sorry for the rather long mail........


More details on what I have done for now :

As noted in the ticket, I can now create a viewAction annotation like this one :


@ViewActionBindingType
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.METHOD, ElementType.TYPE})
public @interface MyViewAction {
MyAppViewConfig.Pages value();
}

MyAppViewConfig being the sample @ViewConfig annotated class in viewconfig sample.

I can then use MyViewAction like this :


@ViewScoped
@Named
public class PageController implements Serializable {
    @MyViewAction(Pages.ITEM)
    public void loadEntry() {
    System.out.println("loadEntry called");
    }
}

For the moment, my code doesn't call this method (I'll just need to copy Seam Security code for it ;) ).


I've also created the following annotation that you can use to annotate your own viewAction annotation :
 - @Condition(condition=String) -> not really type safe.....
 - @Immediate(immediate=Boolean)
 - @OnPostback(onPostback=boolean)
 - @Phase(value=PhaseIdType)

Also, if you need to customise those behaviour per-usage, you can add attributes into your viewAction annotation :
@MyViewAction(Pages.ITEM, immediate=true, condition="#{myBean.eager}")
public void loadEntry()

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