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'use strict';
Object.defineProperty(exports, '__esModule', {
value: true
});
exports.default = void 0;
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;
}
/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
/**
* Priority queue that processes tasks in natural ordering (lower priority first)
* accoridng to the priority computed by the function passed in the constructor.
*
* FIFO ordering isn't guaranteed for tasks with the same priority.
*
* Worker specific tasks with the same priority as a non-worker specific task
* are always processed first.
*/
class PriorityQueue {
constructor(_computePriority) {
_defineProperty(this, '_queue', []);
_defineProperty(this, '_sharedQueue', new MinHeap());
this._computePriority = _computePriority;
}
enqueue(task, workerId) {
if (workerId == null) {
this._enqueue(task, this._sharedQueue);
} else {
const queue = this._getWorkerQueue(workerId);
this._enqueue(task, queue);
}
}
_enqueue(task, queue) {
const item = {
priority: this._computePriority(task.request[2], ...task.request[3]),
task
};
queue.add(item);
}
dequeue(workerId) {
const workerQueue = this._getWorkerQueue(workerId);
const workerTop = workerQueue.peek();
const sharedTop = this._sharedQueue.peek(); // use the task from the worker queue if there's no task in the shared queue
// or if the priority of the worker queue is smaller or equal to the
// priority of the top task in the shared queue. The tasks of the
// worker specific queue are preferred because no other worker can pick this
// specific task up.
if (
sharedTop == null ||
(workerTop != null && workerTop.priority <= sharedTop.priority)
) {
var _workerQueue$poll$tas, _workerQueue$poll;
return (_workerQueue$poll$tas =
(_workerQueue$poll = workerQueue.poll()) === null ||
_workerQueue$poll === void 0
? void 0
: _workerQueue$poll.task) !== null && _workerQueue$poll$tas !== void 0
? _workerQueue$poll$tas
: null;
}
return this._sharedQueue.poll().task;
}
_getWorkerQueue(workerId) {
let queue = this._queue[workerId];
if (queue == null) {
queue = this._queue[workerId] = new MinHeap();
}
return queue;
}
}
exports.default = PriorityQueue;
class MinHeap {
constructor() {
_defineProperty(this, '_heap', []);
}
peek() {
var _this$_heap$;
return (_this$_heap$ = this._heap[0]) !== null && _this$_heap$ !== void 0
? _this$_heap$
: null;
}
add(item) {
const nodes = this._heap;
nodes.push(item);
if (nodes.length === 1) {
return;
}
let currentIndex = nodes.length - 1; // Bubble up the added node as long as the parent is bigger
while (currentIndex > 0) {
const parentIndex = Math.floor((currentIndex + 1) / 2) - 1;
const parent = nodes[parentIndex];
if (parent.priority <= item.priority) {
break;
}
nodes[currentIndex] = parent;
nodes[parentIndex] = item;
currentIndex = parentIndex;
}
}
poll() {
const nodes = this._heap;
const result = nodes[0];
const lastElement = nodes.pop(); // heap was empty or removed the last element
if (result == null || nodes.length === 0) {
return result !== null && result !== void 0 ? result : null;
}
let index = 0;
nodes[0] =
lastElement !== null && lastElement !== void 0 ? lastElement : null;
const element = nodes[0];
while (true) {
let swapIndex = null;
const rightChildIndex = (index + 1) * 2;
const leftChildIndex = rightChildIndex - 1;
const rightChild = nodes[rightChildIndex];
const leftChild = nodes[leftChildIndex]; // if the left child is smaller, swap with the left
if (leftChild != null && leftChild.priority < element.priority) {
swapIndex = leftChildIndex;
} // If the right child is smaller or the right child is smaller than the left
// then swap with the right child
if (
rightChild != null &&
rightChild.priority < (swapIndex == null ? element : leftChild).priority
) {
swapIndex = rightChildIndex;
}
if (swapIndex == null) {
break;
}
nodes[index] = nodes[swapIndex];
nodes[swapIndex] = element;
index = swapIndex;
}
return result;
}
}