Invoking server side code

Description

The Restlet-GWT API is both a subset and a superset of the Restlet API.

It is a subset because, as mentioned above, parts of the Restlet API have been deleted, where they depend on Java platform features not available in the Javascript environment.

It is a superset because the Restlet-GWT API is fully (and only) asynchronous, which the Restlet 1.1 API is not.  This is necessary to conform to the behavior of the XmlHttpRequest-based Client, as well as the strictures of the unthreaded Javascript environment.  In the future, the Restlet API will expose asynchronous calls, and these will hopefully converge with the Restlet-GWT API.

Here is a snippet of code (from the downloadable example below) showing briefly how to instantiate a Client and make an asynchronous GET call:

        closeButton.addClickListener(new ClickListener() {
            public void onClick(Widget sender) {
                final Client client = new Client(Protocol.HTTP);
                client.get("http://localhost:8888/ping", new Callback() {
                    @Override
                    public void onEvent(Request request, Response response) {
                        button.setText(response.getEntity().getText());
                    }
                });
                dialogBox.hide();
            }
        });