first commit

app_vue/node_modules/jest-worker/build/Farm.js

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+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+exports.default = void 0;
+
+var _FifoQueue = _interopRequireDefault(require('./FifoQueue'));
+
+var _types = require('./types');
+
+function _interopRequireDefault(obj) {
+  return obj && obj.__esModule ? obj : {default: obj};
+}
+
+function _defineProperty(obj, key, value) {
+  if (key in obj) {
+    Object.defineProperty(obj, key, {
+      value: value,
+      enumerable: true,
+      configurable: true,
+      writable: true
+    });
+  } else {
+    obj[key] = value;
+  }
+  return obj;
+}
+
+class Farm {
+  constructor(_numOfWorkers, _callback, options = {}) {
+    var _options$workerSchedu, _options$taskQueue;
+
+    _defineProperty(this, '_computeWorkerKey', void 0);
+
+    _defineProperty(this, '_workerSchedulingPolicy', void 0);
+
+    _defineProperty(this, '_cacheKeys', Object.create(null));
+
+    _defineProperty(this, '_locks', []);
+
+    _defineProperty(this, '_offset', 0);
+
+    _defineProperty(this, '_taskQueue', void 0);
+
+    this._numOfWorkers = _numOfWorkers;
+    this._callback = _callback;
+    this._computeWorkerKey = options.computeWorkerKey;
+    this._workerSchedulingPolicy =
+      (_options$workerSchedu = options.workerSchedulingPolicy) !== null &&
+      _options$workerSchedu !== void 0
+        ? _options$workerSchedu
+        : 'round-robin';
+    this._taskQueue =
+      (_options$taskQueue = options.taskQueue) !== null &&
+      _options$taskQueue !== void 0
+        ? _options$taskQueue
+        : new _FifoQueue.default();
+  }
+
+  doWork(method, ...args) {
+    const customMessageListeners = new Set();
+
+    const addCustomMessageListener = listener => {
+      customMessageListeners.add(listener);
+      return () => {
+        customMessageListeners.delete(listener);
+      };
+    };
+
+    const onCustomMessage = message => {
+      customMessageListeners.forEach(listener => listener(message));
+    };
+
+    const promise = new Promise( // Bind args to this function so it won't reference to the parent scope.
+      // This prevents a memory leak in v8, because otherwise the function will
+      // retaine args for the closure.
+      ((args, resolve, reject) => {
+        const computeWorkerKey = this._computeWorkerKey;
+        const request = [_types.CHILD_MESSAGE_CALL, false, method, args];
+        let worker = null;
+        let hash = null;
+
+        if (computeWorkerKey) {
+          hash = computeWorkerKey.call(this, method, ...args);
+          worker = hash == null ? null : this._cacheKeys[hash];
+        }
+
+        const onStart = worker => {
+          if (hash != null) {
+            this._cacheKeys[hash] = worker;
+          }
+        };
+
+        const onEnd = (error, result) => {
+          customMessageListeners.clear();
+
+          if (error) {
+            reject(error);
+          } else {
+            resolve(result);
+          }
+        };
+
+        const task = {
+          onCustomMessage,
+          onEnd,
+          onStart,
+          request
+        };
+
+        if (worker) {
+          this._taskQueue.enqueue(task, worker.getWorkerId());
+
+          this._process(worker.getWorkerId());
+        } else {
+          this._push(task);
+        }
+      }).bind(null, args)
+    );
+    promise.UNSTABLE_onCustomMessage = addCustomMessageListener;
+    return promise;
+  }
+
+  _process(workerId) {
+    if (this._isLocked(workerId)) {
+      return this;
+    }
+
+    const task = this._taskQueue.dequeue(workerId);
+
+    if (!task) {
+      return this;
+    }
+
+    if (task.request[1]) {
+      throw new Error('Queue implementation returned processed task');
+    } // Reference the task object outside so it won't be retained by onEnd,
+    // and other properties of the task object, such as task.request can be
+    // garbage collected.
+
+    const taskOnEnd = task.onEnd;
+
+    const onEnd = (error, result) => {
+      taskOnEnd(error, result);
+
+      this._unlock(workerId);
+
+      this._process(workerId);
+    };
+
+    task.request[1] = true;
+
+    this._lock(workerId);
+
+    this._callback(
+      workerId,
+      task.request,
+      task.onStart,
+      onEnd,
+      task.onCustomMessage
+    );
+
+    return this;
+  }
+
+  _push(task) {
+    this._taskQueue.enqueue(task);
+
+    const offset = this._getNextWorkerOffset();
+
+    for (let i = 0; i < this._numOfWorkers; i++) {
+      this._process((offset + i) % this._numOfWorkers);
+
+      if (task.request[1]) {
+        break;
+      }
+    }
+
+    return this;
+  }
+
+  _getNextWorkerOffset() {
+    switch (this._workerSchedulingPolicy) {
+      case 'in-order':
+        return 0;
+
+      case 'round-robin':
+        return this._offset++;
+    }
+  }
+
+  _lock(workerId) {
+    this._locks[workerId] = true;
+  }
+
+  _unlock(workerId) {
+    this._locks[workerId] = false;
+  }
+
+  _isLocked(workerId) {
+    return this._locks[workerId];
+  }
+}
+
+exports.default = Farm;