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