GWT-RPC with JSON

[removevutran320]

Version: SmartGWT 2.2 with RPC extension

I'm trying to implement a SmartGWT-RPC solution, but doing it a little differently by returning JSON back to the executeFetch instead of Java objects. It seems to work pretty well and my grid gets populated.

Where it gets tricky, is when I need to navigate down the JSON using setValueXPath. Since I'm using GWT-RPC, I need to set DSProtocol.CLIENTCUSTOM in my datasource, and valueXPath doesn't seem to work.

Does setValueXPath get ignored because I'm using ClientCustom and it expects me to process all data myself ?

If so, is there a way I can still use GWT-RPC and valueXPath together ?


Datasource:

public class LaborRateDS extends GwtRpcJsonDataSource {
		
	
	public LaborRateDS() {
		DataSourceField field;
		field = new DataSourceTextField("id", "Id");
		field.setPrimaryKey(true);
		field.setHidden(true);
		field.setRequired(false);
		addField(field);

		field = new DataSourceTextField("rateValue", "Rate Value");
		field.setRequired(true);
		addField(field);
		
		field = new DataSourceTextField("year", "Year");
		field.setRequired(true);
		addField(field);
		
		field = new DataSourceTextField("userId", "User Id");
		field.setValueXPath("data/rateSheet/userId");
		field.setRequired(true);
		addField(field);
		
		field = new DataSourceTextField("effectiveDate", "Effective Date");
		field.setValueXPath("data/rateSheet/effectiveDate");
		field.setRequired(true);
		addField(field);
	}

	@Override
	protected void executeFetch(final String requestId,
			final DSRequest request, final DSResponse response) {

		String rateSheetId = request.getCriteria().getAttribute("rateSheetId");
		System.out.println("rateSheetId=" + rateSheetId);
		System.out.println("startRow=" + request.getStartRow());
		System.out.println("endRow=" + request.getEndRow());
		RateSheetServiceAsync service = GWT.create(RateSheetService.class);
		service.fetchLaborRates(rateSheetId, new AsyncCallback<String>() {
			@Override
			public void onFailure(Throwable caught) {
				caught.printStackTrace();
				response.setStatus(RPCResponse.STATUS_FAILURE);
				processResponse(requestId, response);				
			}

			@Override
			public void onSuccess(String json) {

    			JavaScriptObject jsObj = JSON.decode(json);
    			
				response.setJsObj(jsObj);
				
				processResponse(requestId, response);
			}
		});
	}
}

JSON:

{
   "status":0,
   "startRow":0,
   "endRow":50,
   "totalRows":1344,
   "data":[
      {
         "id":"00BAB4AE-A48C-4288-AF40-BEA794370813",
         "laborGuid":"E31E5566-3662-4A2F-8218-59D15F123803",
         "rateIndexGuid":"4D5ECC96-8687-4000-9D22-8C33BD4D178C",
         "rateValue":"36.8700000000",
         "year":2010,
         "rateSheet":{
            "id":"4D5ECC96-8687-4000-9D22-8C33BD4D178C",
            "name":"Ver 026 - 08/19/10",
            "active":true,
            "effectiveDate":"Sep 8, 2010 6:08:45 PM",
            "userId":"BATCH",
            "businessUnit":"SAS"
         }
      },
      {
         "id":"011025D4-7C12-4828-AFA4-490BABA98BD6",
         "laborGuid":"CB3C58C0-3A1D-4366-872A-49669F28518C",
         "rateIndexGuid":"4D5ECC96-8687-4000-9D22-8C33BD4D178C",
         "rateValue":"46.8700000000",
         "year":2010,
         "rateSheet":{
            "id":"4D5ECC96-8687-4000-9D22-8C33BD4D178C",
            "name":"Ver 026 - 08/19/10",
            "active":true,
            "effectiveDate":"Sep 8, 2010 6:08:45 PM",
            "userId":"BATCH",
            "businessUnit":"SAS"
         }
      }
 
   ]
}