3 * Copyright(c) 2006-2010 Ext JS, LLC
5 * http://www.extjs.com/license
8 * @class Ext.direct.RemotingProvider
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9 * @extends Ext.direct.JsonProvider
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11 * <p>The {@link Ext.direct.RemotingProvider RemotingProvider} exposes access to
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12 * server side methods on the client (a remote procedure call (RPC) type of
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13 * connection where the client can initiate a procedure on the server).</p>
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15 * <p>This allows for code to be organized in a fashion that is maintainable,
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16 * while providing a clear path between client and server, something that is
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17 * not always apparent when using URLs.</p>
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19 * <p>To accomplish this the server-side needs to describe what classes and methods
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20 * are available on the client-side. This configuration will typically be
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21 * outputted by the server-side Ext.Direct stack when the API description is built.</p>
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23 Ext.direct.RemotingProvider = Ext.extend(Ext.direct.JsonProvider, {
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25 * @cfg {Object} actions
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26 * Object literal defining the server side actions and methods. For example, if
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27 * the Provider is configured with:
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29 "actions":{ // each property within the 'actions' object represents a server side Class
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30 "TestAction":[ // array of methods within each server side Class to be
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31 { // stubbed out on client
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35 "name":"multiply",// name of method
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36 "len":2 // The number of parameters that will be used to create an
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37 // array of data to send to the server side function.
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38 // Ensure the server sends back a Number, not a String.
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41 "formHandler":true, // direct the client to use specialized form handling method
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46 * <p>Note that a Store is not required, a server method can be called at any time.
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47 * In the following example a <b>client side</b> handler is used to call the
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48 * server side method "multiply" in the server-side "TestAction" Class:</p>
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50 TestAction.multiply(
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51 2, 4, // pass two arguments to server, so specify len=2
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52 // callback function after the server is called
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53 // result: the result returned by the server
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54 // e: Ext.Direct.RemotingEvent object
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55 function(result, e){
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56 var t = e.getTransaction();
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57 var action = t.action; // server side Class called
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58 var method = t.method; // server side method called
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60 var answer = Ext.encode(result); // 8
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63 var msg = e.message; // failure message
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68 * In the example above, the server side "multiply" function will be passed two
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69 * arguments (2 and 4). The "multiply" method should return the value 8 which will be
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70 * available as the <tt>result</tt> in the example above.
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74 * @cfg {String/Object} namespace
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75 * Namespace for the Remoting Provider (defaults to the browser global scope of <i>window</i>).
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76 * Explicitly specify the namespace Object, or specify a String to have a
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77 * {@link Ext#namespace namespace created} implicitly.
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82 * <b>Required<b>. The url to connect to the {@link Ext.Direct} server-side router.
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86 * @cfg {String} enableUrlEncode
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87 * Specify which param will hold the arguments for the method.
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88 * Defaults to <tt>'data'</tt>.
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92 * @cfg {Number/Boolean} enableBuffer
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93 * <p><tt>true</tt> or <tt>false</tt> to enable or disable combining of method
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94 * calls. If a number is specified this is the amount of time in milliseconds
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95 * to wait before sending a batched request (defaults to <tt>10</tt>).</p>
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96 * <br><p>Calls which are received within the specified timeframe will be
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97 * concatenated together and sent in a single request, optimizing the
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98 * application by reducing the amount of round trips that have to be made
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99 * to the server.</p>
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104 * @cfg {Number} maxRetries
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105 * Number of times to re-attempt delivery on failure of a call. Defaults to <tt>1</tt>.
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110 * @cfg {Number} timeout
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111 * The timeout to use for each request. Defaults to <tt>undefined</tt>.
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113 timeout: undefined,
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115 constructor : function(config){
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116 Ext.direct.RemotingProvider.superclass.constructor.call(this, config);
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119 * @event beforecall
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120 * Fires immediately before the client-side sends off the RPC call.
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121 * By returning false from an event handler you can prevent the call from
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123 * @param {Ext.direct.RemotingProvider} provider
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124 * @param {Ext.Direct.Transaction} transaction
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129 * Fires immediately after the request to the server-side is sent. This does
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130 * NOT fire after the response has come back from the call.
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131 * @param {Ext.direct.RemotingProvider} provider
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132 * @param {Ext.Direct.Transaction} transaction
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136 this.namespace = (Ext.isString(this.namespace)) ? Ext.ns(this.namespace) : this.namespace || window;
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137 this.transactions = {};
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138 this.callBuffer = [];
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142 initAPI : function(){
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143 var o = this.actions;
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145 var cls = this.namespace[c] || (this.namespace[c] = {}),
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147 for(var i = 0, len = ms.length; i < len; i++){
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149 cls[m.name] = this.createMethod(c, m);
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155 isConnected: function(){
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156 return !!this.connected;
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159 connect: function(){
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162 this.connected = true;
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163 this.fireEvent('connect', this);
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164 }else if(!this.url){
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165 throw 'Error initializing RemotingProvider, no url configured.';
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169 disconnect: function(){
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170 if(this.connected){
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171 this.connected = false;
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172 this.fireEvent('disconnect', this);
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176 onData: function(opt, success, xhr){
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178 var events = this.getEvents(xhr);
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179 for(var i = 0, len = events.length; i < len; i++){
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181 t = this.getTransaction(e);
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182 this.fireEvent('data', this, e);
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184 this.doCallback(t, e, true);
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185 Ext.Direct.removeTransaction(t);
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189 var ts = [].concat(opt.ts);
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190 for(var i = 0, len = ts.length; i < len; i++){
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191 var t = this.getTransaction(ts[i]);
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192 if(t && t.retryCount < this.maxRetries){
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195 var e = new Ext.Direct.ExceptionEvent({
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198 code: Ext.Direct.exceptions.TRANSPORT,
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199 message: 'Unable to connect to the server.',
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202 this.fireEvent('data', this, e);
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204 this.doCallback(t, e, false);
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205 Ext.Direct.removeTransaction(t);
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212 getCallData: function(t){
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222 doSend : function(data){
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225 callback: this.onData,
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228 timeout: this.timeout
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231 if(Ext.isArray(data)){
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233 for(var i = 0, len = data.length; i < len; i++){
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234 callData.push(this.getCallData(data[i]));
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237 callData = this.getCallData(data);
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240 if(this.enableUrlEncode){
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242 params[Ext.isString(this.enableUrlEncode) ? this.enableUrlEncode : 'data'] = Ext.encode(callData);
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245 o.jsonData = callData;
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247 Ext.Ajax.request(o);
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250 combineAndSend : function(){
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251 var len = this.callBuffer.length;
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253 this.doSend(len == 1 ? this.callBuffer[0] : this.callBuffer);
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254 this.callBuffer = [];
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258 queueTransaction: function(t){
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260 this.processForm(t);
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263 this.callBuffer.push(t);
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264 if(this.enableBuffer){
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265 if(!this.callTask){
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266 this.callTask = new Ext.util.DelayedTask(this.combineAndSend, this);
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268 this.callTask.delay(Ext.isNumber(this.enableBuffer) ? this.enableBuffer : 10);
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270 this.combineAndSend();
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274 doCall : function(c, m, args){
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275 var data = null, hs = args[m.len], scope = args[m.len+1];
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278 data = args.slice(0, m.len);
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281 var t = new Ext.Direct.Transaction({
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287 cb: scope && Ext.isFunction(hs) ? hs.createDelegate(scope) : hs
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290 if(this.fireEvent('beforecall', this, t) !== false){
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291 Ext.Direct.addTransaction(t);
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292 this.queueTransaction(t);
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293 this.fireEvent('call', this, t);
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297 doForm : function(c, m, form, callback, scope){
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298 var t = new Ext.Direct.Transaction({
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302 args:[form, callback, scope],
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303 cb: scope && Ext.isFunction(callback) ? callback.createDelegate(scope) : callback,
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307 if(this.fireEvent('beforecall', this, t) !== false){
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308 Ext.Direct.addTransaction(t);
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309 var isUpload = String(form.getAttribute("enctype")).toLowerCase() == 'multipart/form-data',
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315 extUpload: String(isUpload)
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318 // change made from typeof callback check to callback.params
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319 // to support addl param passing in DirectSubmit EAC 6/2
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321 form: Ext.getDom(form),
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322 isUpload: isUpload,
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323 params: callback && Ext.isObject(callback.params) ? Ext.apply(params, callback.params) : params
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325 this.fireEvent('call', this, t);
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326 this.processForm(t);
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330 processForm: function(t){
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334 callback: this.onData,
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337 isUpload: t.isUpload,
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342 createMethod : function(c, m){
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344 if(!m.formHandler){
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346 this.doCall(c, m, Array.prototype.slice.call(arguments, 0));
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347 }.createDelegate(this);
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349 f = function(form, callback, scope){
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350 this.doForm(c, m, form, callback, scope);
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351 }.createDelegate(this);
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360 getTransaction: function(opt){
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361 return opt && opt.tid ? Ext.Direct.getTransaction(opt.tid) : null;
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364 doCallback: function(t, e){
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365 var fn = e.status ? 'success' : 'failure';
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368 result = Ext.isDefined(e.result) ? e.result : e.data;
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369 if(Ext.isFunction(hs)){
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372 Ext.callback(hs[fn], hs.scope, [result, e]);
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373 Ext.callback(hs.callback, hs.scope, [result, e]);
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378 Ext.Direct.PROVIDERS['remoting'] = Ext.direct.RemotingProvider;