source: Dev/trunk/src/client/dojo/rpc/JsonService.js

define([
        "../_base/declare", "../_base/Deferred", "../_base/json", "../_base/lang", "../_base/xhr",
        "./RpcService"
], function(declare, Deferred, json, lang, xhr, RpcService){

        // module:
        //              dojo/rpc/JsonService

        return declare("dojo.rpc.JsonService", RpcService, {
                // summary:
                //              TODOC

                bustCache: false,
                contentType: "application/json-rpc",
                lastSubmissionId: 0,

                callRemote: function(method, params){
                        // summary:
                        //              call an arbitrary remote method without requiring it to be
                        //              predefined with SMD
                        // method: string
                        //              the name of the remote method you want to call.
                        // params: array
                        //              array of parameters to pass to method

                        var deferred = new Deferred();
                        this.bind(method, params, deferred);
                        return deferred;
                },

                bind: function(method, parameters, deferredRequestHandler, url){
                        // summary:
                        //              JSON-RPC bind method. Takes remote method, parameters,
                        //              deferred, and a url, calls createRequest to make a JSON-RPC
                        //              envelope and passes that off with bind.
                        // method: string
                        //              The name of the method we are calling
                        // parameters: array
                        //              The parameters we are passing off to the method
                        // deferredRequestHandler: deferred
                        //              The Deferred object for this particular request

                        var def = xhr.post({
                                url: url||this.serviceUrl,
                                postData: this.createRequest(method, parameters),
                                contentType: this.contentType,
                                timeout: this.timeout,
                                handleAs: "json-comment-optional"
                        });
                        def.addCallbacks(this.resultCallback(deferredRequestHandler), this.errorCallback(deferredRequestHandler));
                },

                createRequest: function(method, params){
                        // summary:
                        //              create a JSON-RPC envelope for the request
                        // method: string
                        //              The name of the method we are creating the request for
                        // params: array
                        //              The array of parameters for this request

                        var req = { "params": params, "method": method, "id": ++this.lastSubmissionId };
                        return json.toJson(req);
                },

                parseResults: function(/*anything*/obj){
                        // summary:
                        //              parse the result envelope and pass the results back to
                        //              the callback function
                        // obj: Object
                        //              Object containing envelope of data we receive from the server

                        if(lang.isObject(obj)){
                                if("result" in obj){
                                        return obj.result;
                                }
                                if("Result" in obj){
                                        return obj.Result;
                                }
                                if("ResultSet" in obj){
                                        return obj.ResultSet;
                                }
                        }
                        return obj;
                }
        });

});