RPCManager RPCRequest how to capture the response in gwt

Question

hi i have requirement to capture the data for validations. i am able to fetch the data using RPCRequest and RPCManager by using setActionUrl to the controller class.from there creating the service class and dao classes .i am able to fetch the data into controller class.but i am unable get the data back into my grid.i want the data to be fetched into a variable.i am not using asynchronus service.i used async method in grid i am able to fetch into onSuccess() method.but without using how i can fetch.the data into grid.

with regards subodh

Answer 1

Here example in our ServiceImpl class to retrive datas from DB

    public final String getDatas(final HashMap<String, String> param) {
    List<ShippingBean> result = null;
            JSONObject obj = new JSONObject();
    try {
        // retrieve data from DB
        data = dao.selectAll();
    }
    catch (BusinessException e) {
        throw new InvocationException("BusinessException occurs ...", e);
    }
    obj = JSONObject.fromObject(result);
    return obj.toString();
}

We use net.sf.json to serialize as DOM and return this to presenter call as AsyncCallBack method. And then , retrieve data as like that..

        AsyncCallback<String> callback = new AsyncCallback<String>() {
        public void onFailure(final Throwable caught) {
            Window.alert("Error!");
        }
        public void onSuccess(final String result) {

                    HTML html = new HTML(result.replace("&nbsp;", "-"));
                    JSONValue value = JSONParser.parseLenient(html.getText());
                    JSONWrapper json = new JSONWrapper(value);
                    System.out.println(json.get(0).get("variableName").stringValue());
        }
    };