RequestFactory - BaseRequest, Locator, ServiceLocator, service inheritance on the client

Hi everyone,

I actually try to do a Celltable-Component, that can work with any Proxy-class. So the component should work with a template class T. (Actually it just works with a certain type of Proxy)

Inside the component, i actually got some Requests for the certain Proxy, like delete(), persist(), findall().  These requests I want to make work with all kinds of proxies.
Now, instead of writing:

    CertainEntityRequest request = Factory.certainEntityRequest ();
    Request<List<CertainEntityProxy>> findAll= request.findall(
        offset, size, orderByString);

I want to have a BaseRequest, that has these services for all my proxies.
I tried to put all service-methods that I use in my component into one base-Service, similar to this post http://stackoverflow.com/questions/7625692/gwt-2-4-0-requestfactory-polymorphism.
persist() and remove() works well. But I dont know how to implement the findall() / getDataPage() service.

@Entity class EntityBase {
     //some methods, persist(), remove() etc
     ...
     public List<EntityBase> getDataPage(int offset, int limit,
           	    String orderString) {...}
}  @Entity class SomeEntity extends EntityBase {...}
@Entity class SomeOtherEntity extends EntityBase {...}    ...  @ProxyFor(EntityBase.class) class EntityBaseProxy extends EntityProxy {...}  @ProxyFor(SomeEntity.class) class SomeEntity extends EntityBaseProxy {...}
@ProxyFor(SomeOtherEntity.class) class SomeEntity extends EntityBaseProxy {...}  
...
@Service(value = EntityBase.class, locator = MyServiceLocator.class)
@ExtraTypes({ SomeEntity.class, SomeOtherEntity.class })
public interface EntityBaseRequest extends RequestContext {

    InstanceRequest<EntityBaseProxy, Void> remove();

    InstanceRequest<EntityBaseProxy, Long> persist();

    //This doesnt work. And even if this would work, how to build the query ? I wouldnt know the specific class, it could be SomeEntity or SomeOtherEntity....
    //Thats the error: Could not find domain method similar to java.util.List<...EntityBaseProxy> getDataPage(intintjava.lang.String)
    Request<List<EntityBaseProxy>> getDataPage(int offset, int limit, String orderString)

}

I also found this issue, I guess thats what I try to do: http://code.google.com/p/google-web-toolkit/issues/detail?id=6234


Anyways, Im not sure if I even chose the right approach. Maybe there is already an working example for this ? Or a simpler approch?

Regards,
Manuel

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