I'm refactoring some GWT code that is currently using exceptions to
signal normal business logic failures from the RPC services. I'm
trying to change the code to handle these normal failures in the
AsyncCallback.onSuccess(T result).
I wanted my result objects to:
1. Be able signify that the call was either successful or failed.
2. Be able to provide a localized failure message for failed calls.
3. Not require creating a new class for every service method. (I
don't want the following):
public interface MyService {
GetSomeStringReply getSomeString(GetSomeStringRequest request);
}
The following design would work (even for service methods currently
returning void), but it looks like java.lang.Void isn't serializable,
so GWT won't compile this code.
Has anyone run into this before? What should I do? Is there a better
known design?
public interface Failure {
String getLocalizedMessage(Messages message);
}
public interface Reply<T> {
boolean isSuccessful();
T getResult();
Failure getFailure();
}
public interface MyService {
Reply<String> getSomeString();
Reply<Void> returnsNothing();
}
public interface MyServiceAsync {
void getSomeString(AsyncCallback<Reply<String>> callback)
void returnsNothing(AsyncCallback<Reply<Void>> callback);
}
Thanks,
Brian
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