| 1 | const { WorkerFunctions } = require('./test-types') |
| 2 | |
| 3 | class TestUtils { |
| 4 | static async waitWorkerExits (pool, numberOfExitEventsToWait) { |
| 5 | return new Promise(resolve => { |
| 6 | let exitEvents = 0 |
| 7 | if (numberOfExitEventsToWait === 0) { |
| 8 | resolve(exitEvents) |
| 9 | } |
| 10 | for (const workerNode of pool.workerNodes) { |
| 11 | workerNode.worker.on('exit', () => { |
| 12 | ++exitEvents |
| 13 | if (exitEvents === numberOfExitEventsToWait) { |
| 14 | resolve(exitEvents) |
| 15 | } |
| 16 | }) |
| 17 | } |
| 18 | }) |
| 19 | } |
| 20 | |
| 21 | static async waitPoolEvents (pool, poolEvent, numberOfEventsToWait) { |
| 22 | return new Promise(resolve => { |
| 23 | let events = 0 |
| 24 | if (numberOfEventsToWait === 0) { |
| 25 | resolve(events) |
| 26 | } |
| 27 | pool.emitter.on(poolEvent, () => { |
| 28 | ++events |
| 29 | if (events === numberOfEventsToWait) { |
| 30 | resolve(events) |
| 31 | } |
| 32 | }) |
| 33 | }) |
| 34 | } |
| 35 | |
| 36 | static async sleep (ms) { |
| 37 | return new Promise(resolve => setTimeout(resolve, ms)) |
| 38 | } |
| 39 | |
| 40 | static async sleepWorkerFunction ( |
| 41 | data, |
| 42 | ms, |
| 43 | rejection = false, |
| 44 | rejectionMessage = '' |
| 45 | ) { |
| 46 | return new Promise((resolve, reject) => { |
| 47 | setTimeout( |
| 48 | () => |
| 49 | rejection === true |
| 50 | ? reject(new Error(rejectionMessage)) |
| 51 | : resolve(data), |
| 52 | ms |
| 53 | ) |
| 54 | }) |
| 55 | } |
| 56 | |
| 57 | static generateRandomInteger (max = Number.MAX_SAFE_INTEGER, min = 0) { |
| 58 | if (max < min || max < 0 || min < 0) { |
| 59 | throw new RangeError('Invalid interval') |
| 60 | } |
| 61 | max = Math.floor(max) |
| 62 | if (min != null && min !== 0) { |
| 63 | min = Math.ceil(min) |
| 64 | return Math.floor(Math.random() * (max - min + 1)) + min |
| 65 | } |
| 66 | return Math.floor(Math.random() * (max + 1)) |
| 67 | } |
| 68 | |
| 69 | static jsonIntegerSerialization (n) { |
| 70 | for (let i = 0; i < n; i++) { |
| 71 | const o = { |
| 72 | a: i |
| 73 | } |
| 74 | JSON.stringify(o) |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Intentionally inefficient implementation. |
| 80 | * @param {number} n - The number of fibonacci numbers to generate. |
| 81 | * @returns {number} - The nth fibonacci number. |
| 82 | */ |
| 83 | static fibonacci (n) { |
| 84 | if (n <= 1) return 1 |
| 85 | return TestUtils.fibonacci(n - 1) + TestUtils.fibonacci(n - 2) |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Intentionally inefficient implementation. |
| 90 | * @param {number} n - The number to calculate the factorial of. |
| 91 | * @returns {number} - The factorial of n. |
| 92 | */ |
| 93 | static factorial (n) { |
| 94 | if (n === 0) { |
| 95 | return 1 |
| 96 | } |
| 97 | return TestUtils.factorial(n - 1) * n |
| 98 | } |
| 99 | |
| 100 | static executeWorkerFunction (data) { |
| 101 | switch (data.function) { |
| 102 | case WorkerFunctions.jsonIntegerSerialization: |
| 103 | return TestUtils.jsonIntegerSerialization(data.n || 100) |
| 104 | case WorkerFunctions.fibonacci: |
| 105 | return TestUtils.fibonacci(data.n || 25) |
| 106 | case WorkerFunctions.factorial: |
| 107 | return TestUtils.factorial(data.n || 100) |
| 108 | default: |
| 109 | throw new Error('Unknown worker function') |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | module.exports = TestUtils |