1 | define(["dojo", "dojox", "dojo/io/script", "dojo/data/util/sorter"], function(dojo, dojox) { |
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2 | |
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3 | return dojo.declare("dojox.data.SnapLogicStore", null, { |
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4 | Parts: { |
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5 | DATA: "data", |
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6 | COUNT: "count" |
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7 | }, |
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8 | |
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9 | url: "", |
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10 | |
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11 | constructor: function(/* Object */args){ |
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12 | // summary: |
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13 | // Initialize a SnapLogicStore object. |
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14 | // args: |
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15 | // An object that contains properties for initializing the new data store object. The |
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16 | // following properties are understood: |
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17 | // |
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18 | // - url: |
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19 | // A URL to the SnapLogic pipeline's output routed through PipeToHttp. Typically, this |
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20 | // will look like `http://<server-host>:<port>/pipe/<pipeline-url>/<pipeline-output-view>`. |
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21 | // - parameters: |
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22 | // An object whose properties define parameters to the pipeline. The values of these |
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23 | // properties will be sent to the pipeline as parameters when it run. |
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24 | |
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25 | if(args.url){ |
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26 | this.url = args.url; |
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27 | } |
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28 | this._parameters = args.parameters; |
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29 | }, |
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30 | |
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31 | _assertIsItem: function(/* item */item){ |
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32 | // summary: |
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33 | // This function tests whether the item passed in is indeed an item in the store. |
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34 | // item: |
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35 | // The item to test for being contained by the store. |
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36 | if(!this.isItem(item)){ |
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37 | throw new Error("dojox.data.SnapLogicStore: a function was passed an item argument that was not an item"); |
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38 | } |
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39 | }, |
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40 | |
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41 | _assertIsAttribute: function(/*attribute-name-string*/ attribute){ |
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42 | // summary: |
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43 | // This function tests whether the item passed in is indeed a valid 'attribute' like type for the store. |
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44 | // attribute: |
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45 | // The attribute to test for being contained by the store. |
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46 | if(typeof attribute !== "string"){ |
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47 | throw new Error("dojox.data.SnapLogicStore: a function was passed an attribute argument that was not an attribute name string"); |
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48 | } |
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49 | }, |
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50 | |
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51 | getFeatures: function(){ |
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52 | // summary: |
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53 | // See dojo/data/api/Read.getFeatures() |
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54 | return { |
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55 | 'dojo.data.api.Read': true |
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56 | }; |
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57 | }, |
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58 | |
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59 | getValue: function(item, attribute, defaultValue){ |
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60 | // summary: |
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61 | // See dojo/data/api/Read.getValue() |
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62 | this._assertIsItem(item); |
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63 | this._assertIsAttribute(attribute); |
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64 | var i = dojo.indexOf(item.attributes, attribute); |
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65 | if(i !== -1){ |
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66 | return item.values[i]; |
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67 | } |
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68 | return defaultValue; |
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69 | }, |
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70 | |
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71 | getAttributes: function(item){ |
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72 | // summary: |
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73 | // See dojo/data/api/Read.getAttributes() |
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74 | this._assertIsItem(item); |
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75 | return item.attributes; |
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76 | }, |
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77 | |
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78 | hasAttribute: function(item, attribute){ |
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79 | // summary: |
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80 | // See dojo/data/api/Read.hasAttributes() |
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81 | this._assertIsItem(item); |
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82 | this._assertIsAttribute(attribute); |
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83 | for(var i = 0; i < item.attributes.length; ++i){ |
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84 | if(attribute == item.attributes[i]){ |
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85 | return true; |
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86 | } |
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87 | } |
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88 | return false; |
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89 | }, |
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90 | |
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91 | isItemLoaded: function(item){ |
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92 | // summary: |
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93 | // See dojo/data/api/Read.isItemLoaded() |
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94 | return this.isItem(item); // Boolean |
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95 | }, |
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96 | |
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97 | loadItem: function(keywordArgs){ |
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98 | // summary: |
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99 | // See dojo/data/api/Read.loadItem() |
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100 | }, |
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101 | |
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102 | getLabel: function(item){ |
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103 | // summary: |
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104 | // See dojo/data/api/Read.getLabel() |
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105 | return undefined; |
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106 | }, |
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107 | |
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108 | getLabelAttributes: function(item){ |
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109 | // summary: |
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110 | // See dojo/data/api/Read.getLabelAttributes() |
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111 | return null; |
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112 | }, |
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113 | |
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114 | containsValue: function(item, attribute, value){ |
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115 | // summary: |
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116 | // See dojo/data/api/Read.containsValue() |
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117 | return this.getValue(item, attribute) === value; // Boolean |
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118 | }, |
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119 | |
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120 | getValues: function(item, attribute){ |
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121 | // summary: |
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122 | // See dojo/data/api/Read.getValue() |
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123 | this._assertIsItem(item); |
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124 | this._assertIsAttribute(attribute); |
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125 | var i = dojo.indexOf(item.attributes, attribute); |
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126 | if(i !== -1){ |
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127 | return [item.values[i]]; // Array |
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128 | } |
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129 | return []; |
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130 | }, |
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131 | |
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132 | isItem: function(item){ |
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133 | // summary: |
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134 | // See dojo/data/api/Read.isItem() |
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135 | if(item && item._store === this){ |
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136 | return true; |
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137 | } |
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138 | return false; |
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139 | }, |
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140 | |
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141 | close: function(request){ |
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142 | // summary: |
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143 | // See dojo/data/api/Read.close() |
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144 | }, |
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145 | |
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146 | _fetchHandler: function(/*Object*/ request){ |
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147 | // summary: |
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148 | // Process data retrieved via fetch and send it back to requester. |
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149 | // request: |
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150 | // The data returned from the I/O transport. In the normal case, it will be an array of result rows |
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151 | // from the pipeline. In the special case for record count optimization, response will be an array |
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152 | // with a single element containing the total pipeline result row count. See fetch() for details |
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153 | // on this optimization. |
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154 | |
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155 | var scope = request.scope || dojo.global; |
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156 | |
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157 | if(request.onBegin){ |
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158 | // Check for the record count optimization |
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159 | request.onBegin.call(scope, request._countResponse[0], request); |
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160 | } |
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161 | |
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162 | if(request.onItem || request.onComplete){ |
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163 | var response = request._dataResponse; |
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164 | |
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165 | if(!response.length){ |
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166 | request.onError.call(scope, |
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167 | new Error("dojox.data.SnapLogicStore: invalid response of length 0"), |
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168 | request); |
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169 | return; |
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170 | }else if(request.query != 'record count'){ |
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171 | //If this was not a record count request, the first element returned will contain |
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172 | //the field names. |
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173 | var field_names = response.shift(); |
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174 | |
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175 | var items = []; |
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176 | for(var i = 0; i < response.length; ++i){ |
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177 | if(request._aborted){ |
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178 | break; |
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179 | } |
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180 | |
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181 | items.push({attributes: field_names, values: response[i], _store: this}); |
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182 | } |
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183 | |
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184 | if(request.sort && !request._aborted){ |
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185 | items.sort(dojo.data.util.sorter.createSortFunction(request.sort, self)); |
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186 | } |
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187 | }else{ |
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188 | //This is a record count request, so manually set the field names. |
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189 | items = [({attributes: ['count'], values: response, _store: this})]; |
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190 | } |
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191 | |
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192 | if(request.onItem){ |
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193 | for(var i = 0; i < items.length; ++i){ |
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194 | if(request._aborted){ |
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195 | break; |
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196 | } |
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197 | request.onItem.call(scope, items[i], request); |
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198 | } |
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199 | items = null; |
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200 | } |
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201 | |
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202 | if(request.onComplete && !request._aborted){ |
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203 | request.onComplete.call(scope, items, request); |
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204 | } |
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205 | } |
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206 | }, |
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207 | |
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208 | _partHandler: function(/*Object */ request, /* String */ part, /* Object*/ response){ |
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209 | // summary: |
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210 | // Handle the individual replies for both data and length requests. |
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211 | // request: |
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212 | // The request/handle object used with the original fetch() call. |
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213 | // part: |
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214 | // A value indicating which request this handler call is for (this.Parts). |
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215 | // response: |
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216 | // Response received from the underlying IO transport. |
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217 | |
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218 | if(response instanceof Error){ |
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219 | if(part == this.Parts.DATA){ |
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220 | request._dataHandle = null; |
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221 | }else{ |
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222 | request._countHandle = null; |
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223 | } |
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224 | request._aborted = true; |
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225 | if(request.onError){ |
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226 | request.onError.call(request.scope, response, request); |
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227 | } |
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228 | }else{ |
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229 | if(request._aborted){ |
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230 | return; |
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231 | } |
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232 | if(part == this.Parts.DATA){ |
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233 | request._dataResponse = response; |
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234 | }else{ |
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235 | request._countResponse = response; |
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236 | } |
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237 | if((!request._dataHandle || request._dataResponse !== null) && |
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238 | (!request._countHandle || request._countResponse !== null)){ |
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239 | this._fetchHandler(request); |
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240 | } |
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241 | } |
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242 | }, |
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243 | |
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244 | fetch: function(/*Object*/ request){ |
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245 | // summary: |
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246 | // See dojo/data/api/Read.close() |
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247 | // request: |
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248 | // See dojo/data/api/Read.close() for generic interface. |
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249 | // |
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250 | // In addition to the standard Read API fetch support, this store supports an optimization for |
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251 | // for retrieving the total count of records in the Pipeline without retrieving the data. To |
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252 | // use this optimization, simply provide an onBegin handler without an onItem or onComplete handler. |
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253 | |
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254 | request._countResponse = null; |
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255 | request._dataResponse = null; |
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256 | request._aborted = false; |
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257 | request.abort = function(){ |
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258 | if(!request._aborted){ |
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259 | request._aborted = true; |
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260 | if(request._dataHandle && request._dataHandle.cancel){ |
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261 | request._dataHandle.cancel(); |
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262 | } |
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263 | if(request._countHandle && request._countHandle.cancel){ |
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264 | request._countHandle.cancel(); |
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265 | } |
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266 | } |
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267 | }; |
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268 | |
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269 | // Only make the call for data if onItem or onComplete is used. Otherwise, onBegin will only |
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270 | // require the total row count. |
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271 | if(request.onItem || request.onComplete){ |
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272 | var content = this._parameters || {}; |
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273 | if(request.start){ |
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274 | if(request.start < 0){ |
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275 | throw new Error("dojox.data.SnapLogicStore: request start value must be 0 or greater"); |
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276 | } |
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277 | content['sn.start'] = request.start + 1; |
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278 | } |
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279 | if(request.count){ |
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280 | if(request.count < 0){ |
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281 | throw new Error("dojox.data.SnapLogicStore: request count value 0 or greater"); |
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282 | } |
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283 | content['sn.limit'] = request.count; |
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284 | } |
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285 | |
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286 | content['sn.content_type'] = 'application/javascript'; |
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287 | |
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288 | var store = this; |
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289 | var handler = function(response, ioArgs){ |
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290 | if(response instanceof Error){ |
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291 | store._fetchHandler(response, request); |
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292 | } |
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293 | }; |
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294 | |
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295 | var getArgs = { |
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296 | url: this.url, |
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297 | content: content, |
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298 | // preventCache: true, |
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299 | timeout: 60000, //Starting a pipeline can take a long time. |
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300 | callbackParamName: "sn.stream_header", |
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301 | handle: dojo.hitch(this, "_partHandler", request, this.Parts.DATA) |
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302 | }; |
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303 | |
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304 | request._dataHandle = dojo.io.script.get(getArgs); |
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305 | } |
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306 | |
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307 | if(request.onBegin){ |
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308 | var content = {}; |
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309 | content['sn.count'] = 'records'; |
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310 | content['sn.content_type'] = 'application/javascript'; |
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311 | |
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312 | var getArgs = { |
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313 | url: this.url, |
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314 | content: content, |
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315 | timeout: 60000, |
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316 | callbackParamName: "sn.stream_header", |
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317 | handle: dojo.hitch(this, "_partHandler", request, this.Parts.COUNT) |
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318 | }; |
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319 | |
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320 | request._countHandle = dojo.io.script.get(getArgs); |
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321 | } |
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322 | |
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323 | return request; // Object |
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324 | } |
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325 | }); |
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326 | |
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327 | }); |
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328 | |
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