1 | 'use strict';
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2 |
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3 | Object.defineProperty(exports, '__esModule', {
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4 | value: true
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5 | });
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6 | exports.default = void 0;
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7 |
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8 | var _FifoQueue = _interopRequireDefault(require('./FifoQueue'));
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9 |
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10 | var _types = require('./types');
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11 |
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12 | function _interopRequireDefault(obj) {
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13 | return obj && obj.__esModule ? obj : {default: obj};
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14 | }
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15 |
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16 | function _defineProperty(obj, key, value) {
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17 | if (key in obj) {
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18 | Object.defineProperty(obj, key, {
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19 | value: value,
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20 | enumerable: true,
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21 | configurable: true,
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22 | writable: true
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23 | });
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24 | } else {
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25 | obj[key] = value;
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26 | }
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27 | return obj;
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28 | }
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29 |
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30 | class Farm {
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31 | constructor(_numOfWorkers, _callback, options = {}) {
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32 | var _options$workerSchedu, _options$taskQueue;
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33 |
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34 | this._numOfWorkers = _numOfWorkers;
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35 | this._callback = _callback;
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36 |
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37 | _defineProperty(this, '_computeWorkerKey', void 0);
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38 |
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39 | _defineProperty(this, '_workerSchedulingPolicy', void 0);
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40 |
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41 | _defineProperty(this, '_cacheKeys', Object.create(null));
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42 |
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43 | _defineProperty(this, '_locks', []);
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44 |
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45 | _defineProperty(this, '_offset', 0);
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46 |
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47 | _defineProperty(this, '_taskQueue', void 0);
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48 |
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49 | this._computeWorkerKey = options.computeWorkerKey;
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50 | this._workerSchedulingPolicy =
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51 | (_options$workerSchedu = options.workerSchedulingPolicy) !== null &&
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52 | _options$workerSchedu !== void 0
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53 | ? _options$workerSchedu
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54 | : 'round-robin';
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55 | this._taskQueue =
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56 | (_options$taskQueue = options.taskQueue) !== null &&
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57 | _options$taskQueue !== void 0
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58 | ? _options$taskQueue
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59 | : new _FifoQueue.default();
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60 | }
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61 |
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62 | doWork(method, ...args) {
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63 | const customMessageListeners = new Set();
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64 |
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65 | const addCustomMessageListener = listener => {
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66 | customMessageListeners.add(listener);
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67 | return () => {
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68 | customMessageListeners.delete(listener);
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69 | };
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70 | };
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71 |
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72 | const onCustomMessage = message => {
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73 | customMessageListeners.forEach(listener => listener(message));
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74 | };
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75 |
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76 | const promise = new Promise(
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77 |
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78 |
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79 | ((args, resolve, reject) => {
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80 | const computeWorkerKey = this._computeWorkerKey;
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81 | const request = [_types.CHILD_MESSAGE_CALL, false, method, args];
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82 | let worker = null;
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83 | let hash = null;
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84 |
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85 | if (computeWorkerKey) {
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86 | hash = computeWorkerKey.call(this, method, ...args);
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87 | worker = hash == null ? null : this._cacheKeys[hash];
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88 | }
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89 |
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90 | const onStart = worker => {
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91 | if (hash != null) {
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92 | this._cacheKeys[hash] = worker;
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93 | }
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94 | };
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95 |
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96 | const onEnd = (error, result) => {
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97 | customMessageListeners.clear();
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98 |
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99 | if (error) {
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100 | reject(error);
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101 | } else {
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102 | resolve(result);
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103 | }
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104 | };
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105 |
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106 | const task = {
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107 | onCustomMessage,
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108 | onEnd,
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109 | onStart,
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110 | request
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111 | };
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112 |
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113 | if (worker) {
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114 | this._taskQueue.enqueue(task, worker.getWorkerId());
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115 |
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116 | this._process(worker.getWorkerId());
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117 | } else {
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118 | this._push(task);
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119 | }
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120 | }).bind(null, args)
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121 | );
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122 | promise.UNSTABLE_onCustomMessage = addCustomMessageListener;
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123 | return promise;
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124 | }
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125 |
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126 | _process(workerId) {
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127 | if (this._isLocked(workerId)) {
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128 | return this;
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129 | }
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130 |
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131 | const task = this._taskQueue.dequeue(workerId);
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132 |
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133 | if (!task) {
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134 | return this;
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135 | }
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136 |
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137 | if (task.request[1]) {
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138 | throw new Error('Queue implementation returned processed task');
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139 | }
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140 |
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141 |
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142 |
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143 | const taskOnEnd = task.onEnd;
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144 |
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145 | const onEnd = (error, result) => {
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146 | taskOnEnd(error, result);
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147 |
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148 | this._unlock(workerId);
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149 |
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150 | this._process(workerId);
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151 | };
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152 |
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153 | task.request[1] = true;
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154 |
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155 | this._lock(workerId);
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156 |
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157 | this._callback(
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158 | workerId,
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159 | task.request,
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160 | task.onStart,
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161 | onEnd,
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162 | task.onCustomMessage
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163 | );
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164 |
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165 | return this;
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166 | }
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167 |
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168 | _push(task) {
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169 | this._taskQueue.enqueue(task);
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170 |
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171 | const offset = this._getNextWorkerOffset();
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172 |
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173 | for (let i = 0; i < this._numOfWorkers; i++) {
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174 | this._process((offset + i) % this._numOfWorkers);
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175 |
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176 | if (task.request[1]) {
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177 | break;
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178 | }
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179 | }
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180 |
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181 | return this;
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182 | }
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183 |
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184 | _getNextWorkerOffset() {
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185 | switch (this._workerSchedulingPolicy) {
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186 | case 'in-order':
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187 | return 0;
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188 |
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189 | case 'round-robin':
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190 | return this._offset++;
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191 | }
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192 | }
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193 |
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194 | _lock(workerId) {
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195 | this._locks[workerId] = true;
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196 | }
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197 |
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198 | _unlock(workerId) {
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199 | this._locks[workerId] = false;
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200 | }
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201 |
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202 | _isLocked(workerId) {
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203 | return this._locks[workerId];
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204 | }
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205 | }
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206 |
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207 | exports.default = Farm;
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