3 * Copyright(c) 2006-2010 Sencha Inc.
5 * http://www.sencha.com/license
8 * @class Ext.direct.RemotingProvider
9 * @extends Ext.direct.JsonProvider
11 * <p>The {@link Ext.direct.RemotingProvider RemotingProvider} exposes access to
12 * server side methods on the client (a remote procedure call (RPC) type of
13 * connection where the client can initiate a procedure on the server).</p>
15 * <p>This allows for code to be organized in a fashion that is maintainable,
16 * while providing a clear path between client and server, something that is
17 * not always apparent when using URLs.</p>
19 * <p>To accomplish this the server-side needs to describe what classes and methods
20 * are available on the client-side. This configuration will typically be
21 * outputted by the server-side Ext.Direct stack when the API description is built.</p>
23 Ext.direct.RemotingProvider = Ext.extend(Ext.direct.JsonProvider, {
25 * @cfg {Object} actions
26 * Object literal defining the server side actions and methods. For example, if
27 * the Provider is configured with:
29 "actions":{ // each property within the 'actions' object represents a server side Class
30 "TestAction":[ // array of methods within each server side Class to be
31 { // stubbed out on client
35 "name":"multiply",// name of method
36 "len":2 // The number of parameters that will be used to create an
37 // array of data to send to the server side function.
38 // Ensure the server sends back a Number, not a String.
41 "formHandler":true, // direct the client to use specialized form handling method
46 * <p>Note that a Store is not required, a server method can be called at any time.
47 * In the following example a <b>client side</b> handler is used to call the
48 * server side method "multiply" in the server-side "TestAction" Class:</p>
51 2, 4, // pass two arguments to server, so specify len=2
52 // callback function after the server is called
53 // result: the result returned by the server
54 // e: Ext.Direct.RemotingEvent object
56 var t = e.getTransaction();
57 var action = t.action; // server side Class called
58 var method = t.method; // server side method called
60 var answer = Ext.encode(result); // 8
63 var msg = e.message; // failure message
68 * In the example above, the server side "multiply" function will be passed two
69 * arguments (2 and 4). The "multiply" method should return the value 8 which will be
70 * available as the <tt>result</tt> in the example above.
74 * @cfg {String/Object} namespace
75 * Namespace for the Remoting Provider (defaults to the browser global scope of <i>window</i>).
76 * Explicitly specify the namespace Object, or specify a String to have a
77 * {@link Ext#namespace namespace created} implicitly.
82 * <b>Required<b>. The url to connect to the {@link Ext.Direct} server-side router.
86 * @cfg {String} enableUrlEncode
87 * Specify which param will hold the arguments for the method.
88 * Defaults to <tt>'data'</tt>.
92 * @cfg {Number/Boolean} enableBuffer
93 * <p><tt>true</tt> or <tt>false</tt> to enable or disable combining of method
94 * calls. If a number is specified this is the amount of time in milliseconds
95 * to wait before sending a batched request (defaults to <tt>10</tt>).</p>
96 * <br><p>Calls which are received within the specified timeframe will be
97 * concatenated together and sent in a single request, optimizing the
98 * application by reducing the amount of round trips that have to be made
104 * @cfg {Number} maxRetries
105 * Number of times to re-attempt delivery on failure of a call. Defaults to <tt>1</tt>.
110 * @cfg {Number} timeout
111 * The timeout to use for each request. Defaults to <tt>undefined</tt>.
115 constructor : function(config){
116 Ext.direct.RemotingProvider.superclass.constructor.call(this, config);
120 * Fires immediately before the client-side sends off the RPC call.
121 * By returning false from an event handler you can prevent the call from
123 * @param {Ext.direct.RemotingProvider} provider
124 * @param {Ext.Direct.Transaction} transaction
125 * @param {Object} meta The meta data
130 * Fires immediately after the request to the server-side is sent. This does
131 * NOT fire after the response has come back from the call.
132 * @param {Ext.direct.RemotingProvider} provider
133 * @param {Ext.Direct.Transaction} transaction
134 * @param {Object} meta The meta data
138 this.namespace = (Ext.isString(this.namespace)) ? Ext.ns(this.namespace) : this.namespace || window;
139 this.transactions = {};
140 this.callBuffer = [];
144 initAPI : function(){
145 var o = this.actions;
147 var cls = this.namespace[c] || (this.namespace[c] = {}),
149 for(var i = 0, len = ms.length; i < len; i++){
151 cls[m.name] = this.createMethod(c, m);
157 isConnected: function(){
158 return !!this.connected;
164 this.connected = true;
165 this.fireEvent('connect', this);
167 throw 'Error initializing RemotingProvider, no url configured.';
171 disconnect: function(){
173 this.connected = false;
174 this.fireEvent('disconnect', this);
178 onData: function(opt, success, xhr){
180 var events = this.getEvents(xhr);
181 for(var i = 0, len = events.length; i < len; i++){
183 t = this.getTransaction(e);
184 this.fireEvent('data', this, e);
186 this.doCallback(t, e, true);
187 Ext.Direct.removeTransaction(t);
191 var ts = [].concat(opt.ts);
192 for(var i = 0, len = ts.length; i < len; i++){
193 var t = this.getTransaction(ts[i]);
194 if(t && t.retryCount < this.maxRetries){
197 var e = new Ext.Direct.ExceptionEvent({
200 code: Ext.Direct.exceptions.TRANSPORT,
201 message: 'Unable to connect to the server.',
204 this.fireEvent('data', this, e);
206 this.doCallback(t, e, false);
207 Ext.Direct.removeTransaction(t);
214 getCallData: function(t){
224 doSend : function(data){
227 callback: this.onData,
230 timeout: this.timeout
233 if(Ext.isArray(data)){
235 for(var i = 0, len = data.length; i < len; i++){
236 callData.push(this.getCallData(data[i]));
239 callData = this.getCallData(data);
242 if(this.enableUrlEncode){
244 params[Ext.isString(this.enableUrlEncode) ? this.enableUrlEncode : 'data'] = Ext.encode(callData);
247 o.jsonData = callData;
252 combineAndSend : function(){
253 var len = this.callBuffer.length;
255 this.doSend(len == 1 ? this.callBuffer[0] : this.callBuffer);
256 this.callBuffer = [];
260 queueTransaction: function(t){
265 this.callBuffer.push(t);
266 if(this.enableBuffer){
268 this.callTask = new Ext.util.DelayedTask(this.combineAndSend, this);
270 this.callTask.delay(Ext.isNumber(this.enableBuffer) ? this.enableBuffer : 10);
272 this.combineAndSend();
276 doCall : function(c, m, args){
277 var data = null, hs = args[m.len], scope = args[m.len+1];
280 data = args.slice(0, m.len);
283 var t = new Ext.Direct.Transaction({
289 cb: scope && Ext.isFunction(hs) ? hs.createDelegate(scope) : hs
292 if(this.fireEvent('beforecall', this, t, m) !== false){
293 Ext.Direct.addTransaction(t);
294 this.queueTransaction(t);
295 this.fireEvent('call', this, t, m);
299 doForm : function(c, m, form, callback, scope){
300 var t = new Ext.Direct.Transaction({
304 args:[form, callback, scope],
305 cb: scope && Ext.isFunction(callback) ? callback.createDelegate(scope) : callback,
309 if(this.fireEvent('beforecall', this, t, m) !== false){
310 Ext.Direct.addTransaction(t);
311 var isUpload = String(form.getAttribute("enctype")).toLowerCase() == 'multipart/form-data',
317 extUpload: String(isUpload)
320 // change made from typeof callback check to callback.params
321 // to support addl param passing in DirectSubmit EAC 6/2
323 form: Ext.getDom(form),
325 params: callback && Ext.isObject(callback.params) ? Ext.apply(params, callback.params) : params
327 this.fireEvent('call', this, t, m);
332 processForm: function(t){
336 callback: this.onData,
339 isUpload: t.isUpload,
344 createMethod : function(c, m){
348 this.doCall(c, m, Array.prototype.slice.call(arguments, 0));
349 }.createDelegate(this);
351 f = function(form, callback, scope){
352 this.doForm(c, m, form, callback, scope);
353 }.createDelegate(this);
362 getTransaction: function(opt){
363 return opt && opt.tid ? Ext.Direct.getTransaction(opt.tid) : null;
366 doCallback: function(t, e){
367 var fn = e.status ? 'success' : 'failure';
370 result = Ext.isDefined(e.result) ? e.result : e.data;
371 if(Ext.isFunction(hs)){
374 Ext.callback(hs[fn], hs.scope, [result, e]);
375 Ext.callback(hs.callback, hs.scope, [result, e]);
380 Ext.Direct.PROVIDERS['remoting'] = Ext.direct.RemotingProvider;