Developing Mobile…Force.com and Sencha-Part 3, Step 2: Refactored Query() on Apex controller

PocketCRMController.Query()

@RemoteAction
public static Response Query(QueryRequest qr) {

    Response resp = new Response();

    //Enforce a limit on the number of rows requested.
    final integer QUERY_LIMIT = 500;
    if (qr.start >= QUERY_LIMIT) {
        resp.success = false;
        resp.errorMessage = 'Maximum number of records (' + String.valueOf(QUERY_LIMIT) + ') exceeded!';
        return resp;
    }

    try {
        getAllLeads(qr, resp);
    } catch (Exception e) {
        resp.success = false;
        resp.errorMessage = 'Query failed: ' + e.getMessage();
    }

    return resp;
}