| 1 | const expect = require('expect') |
| 2 | const { DynamicThreadPool } = require('../../../lib/index') |
| 3 | const TestUtils = require('../../test-utils') |
| 4 | const min = 1 |
| 5 | const max = 3 |
| 6 | const pool = new DynamicThreadPool( |
| 7 | min, |
| 8 | max, |
| 9 | './tests/worker-files/thread/testWorker.js', |
| 10 | { |
| 11 | errorHandler: e => console.error(e) |
| 12 | } |
| 13 | ) |
| 14 | |
| 15 | describe('Dynamic thread pool test suite', () => { |
| 16 | it('Verify that the function is executed in a worker thread', async () => { |
| 17 | const result = await pool.execute({ test: 'test' }) |
| 18 | expect(result).toBeDefined() |
| 19 | expect(result).toBeFalsy() |
| 20 | }) |
| 21 | |
| 22 | it('Verify that new workers are created when required, max size is not exceeded and that after a while new workers will die', async () => { |
| 23 | const promises = [] |
| 24 | let poolBusy = 0 |
| 25 | pool.emitter.on('busy', () => poolBusy++) |
| 26 | for (let i = 0; i < max * 2; i++) { |
| 27 | promises.push(pool.execute({ test: 'test' })) |
| 28 | } |
| 29 | expect(pool.workers.length).toBe(max) |
| 30 | // The `busy` event is triggered when the number of submitted tasks at once reach the max number of workers in the dynamic pool. |
| 31 | // So in total numberOfWorkers + 1 times for a loop submitting up to numberOfWorkers * 2 tasks to the dynamic pool. |
| 32 | expect(poolBusy).toBe(max + 1) |
| 33 | const res = await TestUtils.waitExits(pool, max - min) |
| 34 | expect(res).toBe(max - min) |
| 35 | }) |
| 36 | |
| 37 | it('Verify scale thread up and down is working', async () => { |
| 38 | expect(pool.workers.length).toBe(min) |
| 39 | for (let i = 0; i < max * 10; i++) { |
| 40 | pool.execute({ test: 'test' }) |
| 41 | } |
| 42 | expect(pool.workers.length).toBe(max) |
| 43 | await TestUtils.waitExits(pool, max - min) |
| 44 | expect(pool.workers.length).toBe(min) |
| 45 | for (let i = 0; i < max * 10; i++) { |
| 46 | pool.execute({ test: 'test' }) |
| 47 | } |
| 48 | expect(pool.workers.length).toBe(max) |
| 49 | await TestUtils.waitExits(pool, max - min) |
| 50 | expect(pool.workers.length).toBe(min) |
| 51 | }) |
| 52 | |
| 53 | it('Shutdown test', async () => { |
| 54 | let closedThreads = 0 |
| 55 | pool.workers.forEach(w => { |
| 56 | w.on('exit', () => { |
| 57 | closedThreads++ |
| 58 | }) |
| 59 | }) |
| 60 | await pool.destroy() |
| 61 | expect(closedThreads).toBe(min) |
| 62 | }) |
| 63 | |
| 64 | it('Validation of inputs test', () => { |
| 65 | expect(() => new DynamicThreadPool(min)).toThrowError( |
| 66 | new Error('Please specify a file with a worker implementation') |
| 67 | ) |
| 68 | }) |
| 69 | |
| 70 | it('Should work even without opts in input', async () => { |
| 71 | const pool1 = new DynamicThreadPool( |
| 72 | 1, |
| 73 | 1, |
| 74 | './tests/worker-files/thread/testWorker.js' |
| 75 | ) |
| 76 | const res = await pool1.execute({ test: 'test' }) |
| 77 | expect(res).toBeDefined() |
| 78 | expect(res).toBeFalsy() |
| 79 | // We need to clean up the resources after our test |
| 80 | await pool1.destroy() |
| 81 | }) |
| 82 | |
| 83 | it('Verify scale thread up and down is working when long running task is used:hard', async () => { |
| 84 | const longRunningPool = new DynamicThreadPool( |
| 85 | min, |
| 86 | max, |
| 87 | './tests/worker-files/thread/longRunningWorkerHardBehavior.js', |
| 88 | { |
| 89 | errorHandler: e => console.error(e), |
| 90 | onlineHandler: () => console.log('long running worker is online'), |
| 91 | exitHandler: () => console.log('long running worker exited') |
| 92 | } |
| 93 | ) |
| 94 | expect(longRunningPool.workers.length).toBe(min) |
| 95 | for (let i = 0; i < max * 10; i++) { |
| 96 | longRunningPool.execute({ test: 'test' }) |
| 97 | } |
| 98 | expect(longRunningPool.workers.length).toBe(max) |
| 99 | await TestUtils.waitExits(longRunningPool, max - min) |
| 100 | expect(longRunningPool.workers.length).toBe(min) |
| 101 | // We need to clean up the resources after our test |
| 102 | await longRunningPool.destroy() |
| 103 | }) |
| 104 | |
| 105 | it('Verify scale thread up and down is working when long running task is used:soft', async () => { |
| 106 | const longRunningPool = new DynamicThreadPool( |
| 107 | min, |
| 108 | max, |
| 109 | './tests/worker-files/thread/longRunningWorkerSoftBehavior.js', |
| 110 | { |
| 111 | errorHandler: e => console.error(e), |
| 112 | onlineHandler: () => console.log('long running worker is online'), |
| 113 | exitHandler: () => console.log('long running worker exited') |
| 114 | } |
| 115 | ) |
| 116 | expect(longRunningPool.workers.length).toBe(min) |
| 117 | for (let i = 0; i < max * 10; i++) { |
| 118 | longRunningPool.execute({ test: 'test' }) |
| 119 | } |
| 120 | expect(longRunningPool.workers.length).toBe(max) |
| 121 | await TestUtils.sleep(1500) |
| 122 | // Here we expect the workers to be at the max size since that the task is still running |
| 123 | expect(longRunningPool.workers.length).toBe(max) |
| 124 | // We need to clean up the resources after our test |
| 125 | await longRunningPool.destroy() |
| 126 | }) |
| 127 | |
| 128 | it('Verify that a pool with zero worker can be instantiated', async () => { |
| 129 | const pool = new DynamicThreadPool( |
| 130 | 0, |
| 131 | max, |
| 132 | './tests/worker-files/thread/testWorker.js' |
| 133 | ) |
| 134 | expect(pool).toBeInstanceOf(DynamicThreadPool) |
| 135 | // We need to clean up the resources after our test |
| 136 | await pool.destroy() |
| 137 | }) |
| 138 | }) |