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1 YUI.add('datasource-local', function (Y, NAME) { |
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2 |
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3 /** |
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4 * The DataSource utility provides a common configurable interface for widgets to |
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5 * access a variety of data, from JavaScript arrays to online database servers. |
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6 * |
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7 * @module datasource |
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8 * @main datasource |
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9 */ |
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10 |
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11 /** |
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12 * Provides the base DataSource implementation, which can be extended to |
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13 * create DataSources for specific data protocols, such as the IO Utility, the |
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14 * Get Utility, or custom functions. |
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15 * |
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16 * @module datasource |
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17 * @submodule datasource-local |
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18 */ |
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19 |
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20 /** |
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21 * Base class for the DataSource Utility. |
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22 * @class DataSource.Local |
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23 * @extends Base |
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24 * @constructor |
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25 */ |
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26 var LANG = Y.Lang, |
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27 |
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28 DSLocal = function() { |
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29 DSLocal.superclass.constructor.apply(this, arguments); |
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30 }; |
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31 |
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32 ///////////////////////////////////////////////////////////////////////////// |
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33 // |
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34 // DataSource static properties |
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35 // |
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36 ///////////////////////////////////////////////////////////////////////////// |
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37 Y.mix(DSLocal, { |
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38 /** |
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39 * Class name. |
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40 * |
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41 * @property NAME |
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42 * @type String |
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43 * @static |
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44 * @final |
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45 * @value "dataSourceLocal" |
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46 */ |
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47 NAME: "dataSourceLocal", |
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48 |
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49 ///////////////////////////////////////////////////////////////////////////// |
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50 // |
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51 // DataSource Attributes |
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52 // |
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53 ///////////////////////////////////////////////////////////////////////////// |
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54 |
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55 ATTRS: { |
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56 /** |
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57 * @attribute source |
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58 * @description Pointer to live data. |
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59 * @type MIXED |
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60 * @default null |
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61 */ |
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62 source: { |
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63 value: null |
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64 } |
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65 }, |
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66 |
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67 /** |
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68 * Global transaction counter. |
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69 * |
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70 * @property _tId |
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71 * @type Number |
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72 * @static |
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73 * @private |
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74 * @default 0 |
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75 */ |
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76 _tId: 0, |
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77 |
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78 /** |
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79 * Global in-progress transaction objects. |
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80 * |
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81 * @property transactions |
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82 * @type Object |
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83 * @static |
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84 */ |
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85 transactions: {}, |
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86 |
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87 /** |
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88 * Returns data to callback. |
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89 * |
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90 * @method issueCallback |
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91 * @param e {EventFacade} Event Facade. |
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92 * @param caller {DataSource} Calling DataSource instance. |
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93 * @static |
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94 */ |
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95 issueCallback: function (e, caller) { |
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96 var callbacks = e.on || e.callback, |
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97 callback = callbacks && callbacks.success, |
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98 payload = e.details[0]; |
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99 |
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100 payload.error = (e.error || e.response.error); |
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101 |
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102 if (payload.error) { |
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103 caller.fire("error", payload); |
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104 callback = callbacks && callbacks.failure; |
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105 } |
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106 |
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107 if (callback) { |
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108 //TODO: this should be executed from a specific context |
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109 callback(payload); |
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110 } |
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111 } |
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112 }); |
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113 |
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114 Y.extend(DSLocal, Y.Base, { |
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115 /** |
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116 * Internal init() handler. |
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117 * |
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118 * @method initializer |
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119 * @param config {Object} Config object. |
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120 * @private |
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121 */ |
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122 initializer: function(config) { |
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123 this._initEvents(); |
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124 }, |
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125 |
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126 /** |
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127 * This method creates all the events for this module. |
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128 * @method _initEvents |
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129 * @private |
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130 */ |
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131 _initEvents: function() { |
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132 /** |
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133 * Fired when a data request is received. |
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134 * |
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135 * @event request |
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136 * @param e {EventFacade} Event Facade with the following properties: |
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137 * <dl> |
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138 * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd> |
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139 * <dt>request (Object)</dt> <dd>The request.</dd> |
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140 * <dt>callback (Object)</dt> <dd>The callback object |
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141 * (deprecated, refer to <strong>on</strong></dd> |
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142 * <dt>on (Object)</dt> <dd>The map of configured callback |
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143 * functions.</dd> |
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144 * <dt>cfg (Object)</dt> <dd>Configuration object.</dd> |
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145 * </dl> |
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146 * @preventable _defRequestFn |
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147 */ |
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148 this.publish("request", {defaultFn: Y.bind("_defRequestFn", this), queuable:true}); |
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149 |
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150 /** |
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151 * Fired when raw data is received. |
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152 * |
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153 * @event data |
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154 * @param e {EventFacade} Event Facade with the following properties: |
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155 * <dl> |
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156 * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd> |
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157 * <dt>request (Object)</dt> <dd>The request.</dd> |
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158 * <dt>callback (Object)</dt> <dd>Deprecated alias for the |
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159 * <strong>on</strong> property</dd> |
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160 * <dt>on (Object)</dt> <dd>The map of configured transaction |
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161 * callbacks. An object with the following properties: |
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162 * <dl> |
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163 * <dt>success (Function)</dt> <dd>Success handler.</dd> |
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164 * <dt>failure (Function)</dt> <dd>Failure handler.</dd> |
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165 * </dl> |
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166 * </dd> |
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167 * <dt>cfg (Object)</dt> <dd>Configuration object.</dd> |
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168 * <dt>data (Object)</dt> <dd>Raw data.</dd> |
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169 * </dl> |
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170 * @preventable _defDataFn |
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171 */ |
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172 this.publish("data", {defaultFn: Y.bind("_defDataFn", this), queuable:true}); |
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173 |
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174 /** |
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175 * Fired when response is returned. |
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176 * |
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177 * @event response |
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178 * @param e {EventFacade} Event Facade with the following properties: |
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179 * <dl> |
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180 * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd> |
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181 * <dt>request (Object)</dt> <dd>The request.</dd> |
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182 * <dt>callback (Object)</dt> <dd>Deprecated alias for the |
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183 * <strong>on</strong> property</dd> |
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184 * <dt>on (Object)</dt> <dd>The map of configured transaction |
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185 * callbacks. An object with the following properties: |
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186 * <dl> |
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187 * <dt>success (Function)</dt> <dd>Success handler.</dd> |
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188 * <dt>failure (Function)</dt> <dd>Failure handler.</dd> |
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189 * </dl> |
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190 * </dd> |
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191 * <dt>cfg (Object)</dt> <dd>Configuration object.</dd> |
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192 * <dt>data (Object)</dt> <dd>Raw data.</dd> |
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193 * <dt>response (Object)</dt> |
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194 * <dd>Normalized response object with the following properties: |
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195 * <dl> |
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196 * <dt>results (Object)</dt> <dd>Parsed results.</dd> |
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197 * <dt>meta (Object)</dt> <dd>Parsed meta data.</dd> |
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198 * <dt>error (Boolean)</dt> <dd>Error flag.</dd> |
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199 * </dl> |
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200 * </dd> |
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201 * <dt>error</dt> |
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202 * <dd>Any error that occurred along the transaction lifecycle.</dd> |
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203 * </dl> |
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204 * @preventable _defResponseFn |
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205 */ |
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206 this.publish("response", {defaultFn: Y.bind("_defResponseFn", this), queuable:true}); |
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207 |
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208 /** |
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209 * Fired when an error is encountered. |
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210 * |
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211 * @event error |
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212 * @param e {EventFacade} Event Facade with the following properties: |
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213 * <dl> |
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214 * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd> |
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215 * <dt>request (Object)</dt> <dd>The request.</dd> |
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216 * <dt>callback (Object)</dt> <dd>Deprecated alias for the |
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217 * <strong>on</strong> property</dd> |
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218 * <dt>on (Object)</dt> <dd>The map of configured transaction |
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219 * callbacks. An object with the following properties: |
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220 * <dl> |
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221 * <dt>success (Function)</dt> <dd>Success handler.</dd> |
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222 * <dt>failure (Function)</dt> <dd>Failure handler.</dd> |
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223 * </dl> |
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224 * </dd> |
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225 * <dt>cfg (Object)</dt> <dd>Configuration object.</dd> |
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226 * <dt>data (Object)</dt> <dd>Raw data.</dd> |
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227 * <dt>response (Object)</dt> |
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228 * <dd>Normalized response object with the following properties: |
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229 * <dl> |
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230 * <dt>results (Object)</dt> <dd>Parsed results.</dd> |
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231 * <dt>meta (Object)</dt> <dd>Parsed meta data.</dd> |
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232 * <dt>error (Object)</dt> <dd>Error object.</dd> |
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233 * </dl> |
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234 * </dd> |
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235 * <dt>error</dt> |
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236 * <dd>Any error that occurred along the transaction lifecycle.</dd> |
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237 * </dl> |
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238 */ |
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239 |
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240 }, |
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241 |
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242 /** |
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243 * Manages request/response transaction. Must fire <code>response</code> |
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244 * event when response is received. This method should be implemented by |
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245 * subclasses to achieve more complex behavior such as accessing remote data. |
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246 * |
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247 * @method _defRequestFn |
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248 * @param e {EventFacade} Event Facadewith the following properties: |
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249 * <dl> |
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250 * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd> |
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251 * <dt>request (Object)</dt> <dd>The request.</dd> |
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252 * <dt>callback (Object)</dt> <dd>Deprecated alias for the |
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253 * <strong>on</strong> property</dd> |
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254 * <dt>on (Object)</dt> <dd>The map of configured transaction |
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255 * callbacks. An object with the following properties: |
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256 * <dl> |
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257 * <dt>success (Function)</dt> <dd>Success handler.</dd> |
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258 * <dt>failure (Function)</dt> <dd>Failure handler.</dd> |
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259 * </dl> |
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260 * </dd> |
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261 * <dt>cfg (Object)</dt> <dd>Configuration object.</dd> |
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262 * </dl> |
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263 * @protected |
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264 */ |
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265 _defRequestFn: function(e) { |
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266 var data = this.get("source"), |
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267 payload = e.details[0]; |
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268 |
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269 // Problematic data |
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270 if(LANG.isUndefined(data)) { |
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271 payload.error = new Error("Local source undefined"); |
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272 Y.log("Local source undefined", "error", "datasource-local"); |
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273 } |
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274 |
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275 payload.data = data; |
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276 this.fire("data", payload); |
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277 Y.log("Transaction " + e.tId + " complete. Request: " + |
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278 Y.dump(e.request) + " . Response: " + Y.dump(e.response), "info", "datasource-local"); |
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279 }, |
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280 |
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281 /** |
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282 * Normalizes raw data into a response that includes results and meta properties. |
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283 * |
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284 * @method _defDataFn |
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285 * @param e {EventFacade} Event Facade with the following properties: |
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286 * <dl> |
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287 * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd> |
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288 * <dt>request (Object)</dt> <dd>The request.</dd> |
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289 * <dt>callback (Object)</dt> <dd>Deprecated alias for the |
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290 * <strong>on</strong> property</dd> |
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291 * <dt>on (Object)</dt> <dd>The map of configured transaction |
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292 * callbacks. An object with the following properties: |
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293 * <dl> |
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294 * <dt>success (Function)</dt> <dd>Success handler.</dd> |
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295 * <dt>failure (Function)</dt> <dd>Failure handler.</dd> |
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296 * </dl> |
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297 * </dd> |
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298 * <dt>cfg (Object)</dt> <dd>Configuration object.</dd> |
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299 * <dt>data (Object)</dt> <dd>Raw data.</dd> |
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300 * </dl> |
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301 * @protected |
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302 */ |
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303 _defDataFn: function(e) { |
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304 var data = e.data, |
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305 meta = e.meta, |
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306 response = { |
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307 results: (LANG.isArray(data)) ? data : [data], |
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308 meta: (meta) ? meta : {} |
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309 }, |
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310 payload = e.details[0]; |
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311 |
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312 payload.response = response; |
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313 this.fire("response", payload); |
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314 }, |
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315 |
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316 /** |
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317 * Sends data as a normalized response to callback. |
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318 * |
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319 * @method _defResponseFn |
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320 * @param e {EventFacade} Event Facade with the following properties: |
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321 * <dl> |
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322 * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd> |
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323 * <dt>request (Object)</dt> <dd>The request.</dd> |
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324 * <dt>callback (Object)</dt> <dd>Deprecated alias for the |
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325 * <strong>on</strong> property</dd> |
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326 * <dt>on (Object)</dt> <dd>The map of configured transaction |
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327 * callbacks. An object with the following properties: |
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328 * <dl> |
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329 * <dt>success (Function)</dt> <dd>Success handler.</dd> |
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330 * <dt>failure (Function)</dt> <dd>Failure handler.</dd> |
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331 * </dl> |
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332 * </dd> |
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333 * <dt>cfg (Object)</dt> <dd>Configuration object.</dd> |
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334 * <dt>data (Object)</dt> <dd>Raw data.</dd> |
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335 * <dt>response (Object)</dt> <dd>Normalized response object with the following properties: |
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336 * <dl> |
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337 * <dt>results (Object)</dt> <dd>Parsed results.</dd> |
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338 * <dt>meta (Object)</dt> <dd>Parsed meta data.</dd> |
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339 * <dt>error (Boolean)</dt> <dd>Error flag.</dd> |
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340 * </dl> |
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341 * </dd> |
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342 * </dl> |
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343 * @protected |
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344 */ |
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345 _defResponseFn: function(e) { |
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346 // Send the response back to the callback |
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347 DSLocal.issueCallback(e, this); |
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348 }, |
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349 |
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350 /** |
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351 * Generates a unique transaction ID and fires <code>request</code> event. |
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352 * <strong>Note</strong>: the property <code>callback</code> is a |
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353 * deprecated alias for the <code>on</code> transaction configuration |
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354 * property described below. |
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355 * |
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356 * @method sendRequest |
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357 * @param [request] {Object} An object literal with the following properties: |
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358 * <dl> |
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359 * <dt><code>request</code></dt> |
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360 * <dd>The request to send to the live data source, if any.</dd> |
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361 * <dt><code>on</code></dt> |
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362 * <dd>An object literal with the following properties: |
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363 * <dl> |
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364 * <dt><code>success</code></dt> |
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365 * <dd>The function to call when the data is ready.</dd> |
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366 * <dt><code>failure</code></dt> |
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367 * <dd>The function to call upon a response failure condition.</dd> |
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368 * <dt><code>argument</code></dt> |
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369 * <dd>Arbitrary data payload that will be passed back to the success and failure handlers.</dd> |
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370 * </dl> |
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371 * </dd> |
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372 * <dt><code>cfg</code></dt> |
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373 * <dd>Configuration object, if any.</dd> |
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374 * </dl> |
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375 * @return {Number} Transaction ID. |
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376 */ |
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377 sendRequest: function(request) { |
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378 var tId = DSLocal._tId++, |
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379 callbacks; |
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380 |
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381 request = request || {}; |
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382 |
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383 callbacks = request.on || request.callback; |
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384 |
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385 this.fire("request", { |
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386 tId: tId, |
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387 request: request.request, |
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388 on: callbacks, |
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389 callback: callbacks, |
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390 cfg: request.cfg || {} |
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391 }); |
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392 |
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393 Y.log("Transaction " + tId + " sent request: " + Y.dump(request.request), "info", "datasource-local"); |
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394 |
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395 return tId; |
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396 } |
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397 }); |
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398 |
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399 Y.namespace("DataSource").Local = DSLocal; |
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400 |
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401 |
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402 }, '@VERSION@', {"requires": ["base"]}); |