client parameters in GWT RequestFactory - gwt

Question

I´m using GWT RequestFactory and want to transport client-side parameters in a service.
The parameters should be created on the client, because they aren´t part of the domain model and won´t be stored in the database.
Unfortunately I found no way to do this, because only xxxProxy objects can be used as parameters and they can only be created on the server.
My concrete example:
I want to download tasks from a server and want to send a filter object with the request as parameter, which specifies the task objects to be loaded.
Thanks for your help!

Answer 1

You can very-well create proxies on the client, using the create() method of your RequestContext. In your case, your proxy would have to be ValueProxy rather than an EntityProxy. You don't have to "store" value proxies (contrary to entity proxies).
I do have the exact same use case as yours, and it works very well.
#Service(MyService.class)
interface MyRequestContext extends RequestContext {
Request<List<TaskProxy>> findTasks(FilterProxy filter);
}
#ProxyFor(Filter.class)
interface FilterProxy extends ValueProxy {
// your getters and setters here
}
...
MyRequestContext ctx = ...;
FilterProxy filter = ctx.create(FilterProxy.class);
filter.setXxx(...);
// set your other filter
ctx.findTasks(filter).fire(new Receiver<List<TaskProxy>>() {
#Override
public void onSuccess(List<TaskProxy> tasks) {
// ...
}
});
As a side note, you wrote “only xxxProxy objects can be used as parameters”, which is wrong; you can very well use primitive types (int, boolean, etc.), their wrapper types (Integer, Boolean, etc.), String, Date, and List or Set of them (or proxy types).