corrade-nucleus-nucleons – Blame information for rev 24
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Rev | Author | Line No. | Line |
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20 | office | 1 | "use strict"; |
2 | module.exports = function (Promise, apiRejection, tryConvertToPromise, |
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3 | createContext, INTERNAL, debug) { |
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4 | var util = require("./util"); |
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5 | var TypeError = require("./errors").TypeError; |
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6 | var inherits = require("./util").inherits; |
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7 | var errorObj = util.errorObj; |
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8 | var tryCatch = util.tryCatch; |
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9 | var NULL = {}; |
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10 | |||
11 | function thrower(e) { |
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12 | setTimeout(function(){throw e;}, 0); |
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13 | } |
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14 | |||
15 | function castPreservingDisposable(thenable) { |
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16 | var maybePromise = tryConvertToPromise(thenable); |
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17 | if (maybePromise !== thenable && |
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18 | typeof thenable._isDisposable === "function" && |
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19 | typeof thenable._getDisposer === "function" && |
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20 | thenable._isDisposable()) { |
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21 | maybePromise._setDisposable(thenable._getDisposer()); |
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22 | } |
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23 | return maybePromise; |
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24 | } |
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25 | function dispose(resources, inspection) { |
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26 | var i = 0; |
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27 | var len = resources.length; |
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28 | var ret = new Promise(INTERNAL); |
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29 | function iterator() { |
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30 | if (i >= len) return ret._fulfill(); |
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31 | var maybePromise = castPreservingDisposable(resources[i++]); |
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32 | if (maybePromise instanceof Promise && |
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33 | maybePromise._isDisposable()) { |
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34 | try { |
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35 | maybePromise = tryConvertToPromise( |
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36 | maybePromise._getDisposer().tryDispose(inspection), |
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37 | resources.promise); |
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38 | } catch (e) { |
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39 | return thrower(e); |
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40 | } |
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41 | if (maybePromise instanceof Promise) { |
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42 | return maybePromise._then(iterator, thrower, |
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43 | null, null, null); |
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44 | } |
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45 | } |
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46 | iterator(); |
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47 | } |
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48 | iterator(); |
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49 | return ret; |
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50 | } |
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51 | |||
52 | function Disposer(data, promise, context) { |
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53 | this._data = data; |
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54 | this._promise = promise; |
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55 | this._context = context; |
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56 | } |
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57 | |||
58 | Disposer.prototype.data = function () { |
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59 | return this._data; |
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60 | }; |
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61 | |||
62 | Disposer.prototype.promise = function () { |
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63 | return this._promise; |
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64 | }; |
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65 | |||
66 | Disposer.prototype.resource = function () { |
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67 | if (this.promise().isFulfilled()) { |
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68 | return this.promise().value(); |
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69 | } |
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70 | return NULL; |
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71 | }; |
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72 | |||
73 | Disposer.prototype.tryDispose = function(inspection) { |
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74 | var resource = this.resource(); |
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75 | var context = this._context; |
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76 | if (context !== undefined) context._pushContext(); |
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77 | var ret = resource !== NULL |
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78 | ? this.doDispose(resource, inspection) : null; |
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79 | if (context !== undefined) context._popContext(); |
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80 | this._promise._unsetDisposable(); |
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81 | this._data = null; |
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82 | return ret; |
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83 | }; |
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84 | |||
85 | Disposer.isDisposer = function (d) { |
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86 | return (d != null && |
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87 | typeof d.resource === "function" && |
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88 | typeof d.tryDispose === "function"); |
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89 | }; |
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90 | |||
91 | function FunctionDisposer(fn, promise, context) { |
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92 | this.constructor$(fn, promise, context); |
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93 | } |
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94 | inherits(FunctionDisposer, Disposer); |
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95 | |||
96 | FunctionDisposer.prototype.doDispose = function (resource, inspection) { |
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97 | var fn = this.data(); |
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98 | return fn.call(resource, resource, inspection); |
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99 | }; |
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100 | |||
101 | function maybeUnwrapDisposer(value) { |
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102 | if (Disposer.isDisposer(value)) { |
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103 | this.resources[this.index]._setDisposable(value); |
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104 | return value.promise(); |
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105 | } |
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106 | return value; |
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107 | } |
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108 | |||
109 | function ResourceList(length) { |
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110 | this.length = length; |
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111 | this.promise = null; |
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112 | this[length-1] = null; |
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113 | } |
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114 | |||
115 | ResourceList.prototype._resultCancelled = function() { |
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116 | var len = this.length; |
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117 | for (var i = 0; i < len; ++i) { |
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118 | var item = this[i]; |
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119 | if (item instanceof Promise) { |
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120 | item.cancel(); |
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121 | } |
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122 | } |
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123 | }; |
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124 | |||
125 | Promise.using = function () { |
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126 | var len = arguments.length; |
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127 | if (len < 2) return apiRejection( |
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128 | "you must pass at least 2 arguments to Promise.using"); |
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129 | var fn = arguments[len - 1]; |
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130 | if (typeof fn !== "function") { |
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131 | return apiRejection("expecting a function but got " + util.classString(fn)); |
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132 | } |
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133 | var input; |
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134 | var spreadArgs = true; |
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135 | if (len === 2 && Array.isArray(arguments[0])) { |
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136 | input = arguments[0]; |
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137 | len = input.length; |
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138 | spreadArgs = false; |
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139 | } else { |
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140 | input = arguments; |
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141 | len--; |
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142 | } |
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143 | var resources = new ResourceList(len); |
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144 | for (var i = 0; i < len; ++i) { |
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145 | var resource = input[i]; |
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146 | if (Disposer.isDisposer(resource)) { |
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147 | var disposer = resource; |
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148 | resource = resource.promise(); |
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149 | resource._setDisposable(disposer); |
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150 | } else { |
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151 | var maybePromise = tryConvertToPromise(resource); |
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152 | if (maybePromise instanceof Promise) { |
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153 | resource = |
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154 | maybePromise._then(maybeUnwrapDisposer, null, null, { |
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155 | resources: resources, |
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156 | index: i |
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157 | }, undefined); |
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158 | } |
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159 | } |
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160 | resources[i] = resource; |
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161 | } |
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162 | |||
163 | var reflectedResources = new Array(resources.length); |
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164 | for (var i = 0; i < reflectedResources.length; ++i) { |
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165 | reflectedResources[i] = Promise.resolve(resources[i]).reflect(); |
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166 | } |
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167 | |||
168 | var resultPromise = Promise.all(reflectedResources) |
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169 | .then(function(inspections) { |
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170 | for (var i = 0; i < inspections.length; ++i) { |
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171 | var inspection = inspections[i]; |
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172 | if (inspection.isRejected()) { |
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173 | errorObj.e = inspection.error(); |
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174 | return errorObj; |
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175 | } else if (!inspection.isFulfilled()) { |
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176 | resultPromise.cancel(); |
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177 | return; |
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178 | } |
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179 | inspections[i] = inspection.value(); |
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180 | } |
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181 | promise._pushContext(); |
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182 | |||
183 | fn = tryCatch(fn); |
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184 | var ret = spreadArgs |
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185 | ? fn.apply(undefined, inspections) : fn(inspections); |
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186 | var promiseCreated = promise._popContext(); |
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187 | debug.checkForgottenReturns( |
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188 | ret, promiseCreated, "Promise.using", promise); |
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189 | return ret; |
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190 | }); |
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191 | |||
192 | var promise = resultPromise.lastly(function() { |
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193 | var inspection = new Promise.PromiseInspection(resultPromise); |
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194 | return dispose(resources, inspection); |
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195 | }); |
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196 | resources.promise = promise; |
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197 | promise._setOnCancel(resources); |
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198 | return promise; |
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199 | }; |
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200 | |||
201 | Promise.prototype._setDisposable = function (disposer) { |
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202 | this._bitField = this._bitField | 131072; |
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203 | this._disposer = disposer; |
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204 | }; |
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205 | |||
206 | Promise.prototype._isDisposable = function () { |
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207 | return (this._bitField & 131072) > 0; |
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208 | }; |
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209 | |||
210 | Promise.prototype._getDisposer = function () { |
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211 | return this._disposer; |
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212 | }; |
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213 | |||
214 | Promise.prototype._unsetDisposable = function () { |
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215 | this._bitField = this._bitField & (~131072); |
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216 | this._disposer = undefined; |
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217 | }; |
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218 | |||
219 | Promise.prototype.disposer = function (fn) { |
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220 | if (typeof fn === "function") { |
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221 | return new FunctionDisposer(fn, this, createContext()); |
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222 | } |
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223 | throw new TypeError(); |
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224 | }; |
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225 | |||
226 | }; |