Gwt Request builder - how to return the response string

Question

I need to implement a function that calls a web service and return the response.

I tried

public String getFolderJson(String path) {  
           Stri         


        

Answer 1

I guess the builder.sendRequest(xxx) will return something like a Future,and you can get the result from that object.What you are using is an asynchronous method of RequestBuilder,there should be some synchronous method as well.

what does RequestBuilder come from? I can check the api for you.

OK,try this:

public String getFolderJson(String path) {
    String result = "initial_value";
    StringBuilder param = new StringBuilder();
    param.append("?sessionId=").append(getSessionId());
    param.append("&path=").append(path);
    RequestBuilder builder = new RequestBuilder(RequestBuilder.GET,
            "https://localhost/folder" + param);
    final SynchronousQueue resultQueue = new SynchronousQueue();
    try {
        builder.sendRequest(null, new RequestCallback() {
            @Override
            public void onResponseReceived(Request request,
                    Response response) {
                resultQueue.put(response.getText());
                System.out.println(response.getText());
            }

            @Override
            public void onError(Request request, Throwable exception) {
            }
        });
        return resultQueue.take();
    } catch (RequestException e) {
    }
    return result;
}

It seems RequestBuilder does not have any Synchronous method to get the result only a callback.

Be careful this method will block until the response is recieved. If this method is called in an event processing thread of gwt,this would be a bad practice.