| 1 | import { expect } from 'expect' |
| 2 | import { |
| 3 | DynamicThreadPool, |
| 4 | PoolEvents, |
| 5 | WorkerChoiceStrategies |
| 6 | } from '../../../lib/index.cjs' |
| 7 | import { TaskFunctions } from '../../test-types.cjs' |
| 8 | import { sleep, waitPoolEvents, waitWorkerEvents } from '../../test-utils.cjs' |
| 9 | |
| 10 | describe('Dynamic thread pool test suite', () => { |
| 11 | const min = 1 |
| 12 | const max = 3 |
| 13 | const pool = new DynamicThreadPool( |
| 14 | min, |
| 15 | max, |
| 16 | './tests/worker-files/thread/testWorker.mjs', |
| 17 | { |
| 18 | errorHandler: e => console.error(e) |
| 19 | } |
| 20 | ) |
| 21 | |
| 22 | it('Verify that the function is executed in a worker thread', async () => { |
| 23 | let result = await pool.execute({ |
| 24 | function: TaskFunctions.fibonacci |
| 25 | }) |
| 26 | expect(result).toBe(75025) |
| 27 | result = await pool.execute({ |
| 28 | function: TaskFunctions.factorial |
| 29 | }) |
| 30 | expect(result).toBe(9.33262154439441e157) |
| 31 | }) |
| 32 | |
| 33 | it('Verify that new workers are created when required, max size is not exceeded and that after a while new workers will die', async () => { |
| 34 | let poolBusy = 0 |
| 35 | pool.emitter.on(PoolEvents.busy, () => ++poolBusy) |
| 36 | for (let i = 0; i < max * 2; i++) { |
| 37 | pool.execute() |
| 38 | } |
| 39 | expect(pool.workerNodes.length).toBeLessThanOrEqual(max) |
| 40 | expect(pool.workerNodes.length).toBeGreaterThan(min) |
| 41 | expect(poolBusy).toBe(1) |
| 42 | const numberOfExitEvents = await waitWorkerEvents(pool, 'exit', max - min) |
| 43 | expect(numberOfExitEvents).toBe(max - min) |
| 44 | expect(pool.workerNodes.length).toBe(min) |
| 45 | }) |
| 46 | |
| 47 | it('Verify scale thread up and down is working', async () => { |
| 48 | for (let i = 0; i < max * 2; i++) { |
| 49 | pool.execute() |
| 50 | } |
| 51 | expect(pool.workerNodes.length).toBe(max) |
| 52 | await waitWorkerEvents(pool, 'exit', max - min) |
| 53 | expect(pool.workerNodes.length).toBe(min) |
| 54 | for (let i = 0; i < max * 2; i++) { |
| 55 | pool.execute() |
| 56 | } |
| 57 | expect(pool.workerNodes.length).toBe(max) |
| 58 | await waitWorkerEvents(pool, 'exit', max - min) |
| 59 | expect(pool.workerNodes.length).toBe(min) |
| 60 | }) |
| 61 | |
| 62 | it('Shutdown test', async () => { |
| 63 | const exitPromise = waitWorkerEvents(pool, 'exit', min) |
| 64 | expect(pool.emitter.eventNames()).toStrictEqual([PoolEvents.busy]) |
| 65 | let poolDestroy = 0 |
| 66 | pool.emitter.on(PoolEvents.destroy, () => ++poolDestroy) |
| 67 | expect(pool.emitter.eventNames()).toStrictEqual([ |
| 68 | PoolEvents.busy, |
| 69 | PoolEvents.destroy |
| 70 | ]) |
| 71 | await pool.destroy() |
| 72 | const numberOfExitEvents = await exitPromise |
| 73 | expect(pool.started).toBe(false) |
| 74 | expect(pool.emitter.eventNames()).toStrictEqual([]) |
| 75 | expect(pool.readyEventEmitted).toBe(false) |
| 76 | expect(pool.workerNodes.length).toBe(0) |
| 77 | expect(numberOfExitEvents).toBe(min) |
| 78 | expect(poolDestroy).toBe(1) |
| 79 | }) |
| 80 | |
| 81 | it('Validation of inputs test', () => { |
| 82 | expect(() => new DynamicThreadPool(min)).toThrow( |
| 83 | 'The worker file path must be specified' |
| 84 | ) |
| 85 | }) |
| 86 | |
| 87 | it('Should work even without opts in input', async () => { |
| 88 | const pool = new DynamicThreadPool( |
| 89 | min, |
| 90 | max, |
| 91 | './tests/worker-files/thread/testWorker.mjs' |
| 92 | ) |
| 93 | const res = await pool.execute() |
| 94 | expect(res).toStrictEqual({ ok: 1 }) |
| 95 | // We need to clean up the resources after our test |
| 96 | await pool.destroy() |
| 97 | }) |
| 98 | |
| 99 | it('Verify scale thread up and down is working when long executing task is used:hard', async () => { |
| 100 | const longRunningPool = new DynamicThreadPool( |
| 101 | min, |
| 102 | max, |
| 103 | './tests/worker-files/thread/longRunningWorkerHardBehavior.mjs', |
| 104 | { |
| 105 | errorHandler: e => console.error(e), |
| 106 | onlineHandler: () => console.info('long executing worker is online'), |
| 107 | exitHandler: () => console.info('long executing worker exited') |
| 108 | } |
| 109 | ) |
| 110 | expect(longRunningPool.workerNodes.length).toBe(min) |
| 111 | for (let i = 0; i < max * 2; i++) { |
| 112 | longRunningPool.execute() |
| 113 | } |
| 114 | expect(longRunningPool.workerNodes.length).toBe(max) |
| 115 | await waitWorkerEvents(longRunningPool, 'exit', max - min) |
| 116 | expect(longRunningPool.workerNodes.length).toBe(min) |
| 117 | expect( |
| 118 | longRunningPool.workerChoiceStrategyContext.workerChoiceStrategies.get( |
| 119 | longRunningPool.workerChoiceStrategyContext.workerChoiceStrategy |
| 120 | ).nextWorkerNodeKey |
| 121 | ).toBeLessThan(longRunningPool.workerNodes.length) |
| 122 | // We need to clean up the resources after our test |
| 123 | await longRunningPool.destroy() |
| 124 | }) |
| 125 | |
| 126 | it('Verify scale thread up and down is working when long executing task is used:soft', async () => { |
| 127 | const longRunningPool = new DynamicThreadPool( |
| 128 | min, |
| 129 | max, |
| 130 | './tests/worker-files/thread/longRunningWorkerSoftBehavior.mjs', |
| 131 | { |
| 132 | errorHandler: e => console.error(e), |
| 133 | onlineHandler: () => console.info('long executing worker is online'), |
| 134 | exitHandler: () => console.info('long executing worker exited') |
| 135 | } |
| 136 | ) |
| 137 | expect(longRunningPool.workerNodes.length).toBe(min) |
| 138 | for (let i = 0; i < max * 2; i++) { |
| 139 | longRunningPool.execute() |
| 140 | } |
| 141 | expect(longRunningPool.workerNodes.length).toBe(max) |
| 142 | await sleep(1000) |
| 143 | // Here we expect the workerNodes to be at the max size since the task is still executing |
| 144 | expect(longRunningPool.workerNodes.length).toBe(max) |
| 145 | // We need to clean up the resources after our test |
| 146 | await longRunningPool.destroy() |
| 147 | }) |
| 148 | |
| 149 | it('Verify that a pool with zero worker can be instantiated', async () => { |
| 150 | const pool = new DynamicThreadPool( |
| 151 | 0, |
| 152 | max, |
| 153 | './tests/worker-files/thread/testWorker.mjs' |
| 154 | ) |
| 155 | expect(pool).toBeInstanceOf(DynamicThreadPool) |
| 156 | // We need to clean up the resources after our test |
| 157 | await pool.destroy() |
| 158 | }) |
| 159 | |
| 160 | it('Verify that a pool with zero worker works', async () => { |
| 161 | for (const workerChoiceStrategy of Object.values(WorkerChoiceStrategies)) { |
| 162 | const pool = new DynamicThreadPool( |
| 163 | 0, |
| 164 | max, |
| 165 | './tests/worker-files/thread/testWorker.mjs', |
| 166 | { |
| 167 | workerChoiceStrategy |
| 168 | } |
| 169 | ) |
| 170 | expect(pool.starting).toBe(false) |
| 171 | expect(pool.readyEventEmitted).toBe(false) |
| 172 | for (let run = 0; run < 2; run++) { |
| 173 | run % 2 !== 0 && pool.enableTasksQueue(true) |
| 174 | const maxMultiplier = 4 |
| 175 | const promises = new Set() |
| 176 | expect(pool.workerNodes.length).toBe(pool.info.minSize) |
| 177 | for (let i = 0; i < max * maxMultiplier; i++) { |
| 178 | promises.add(pool.execute()) |
| 179 | } |
| 180 | await Promise.all(promises) |
| 181 | expect(pool.readyEventEmitted).toBe(true) |
| 182 | expect(pool.workerNodes.length).toBeGreaterThan(pool.info.minSize) |
| 183 | expect(pool.workerNodes.length).toBeLessThanOrEqual(pool.info.maxSize) |
| 184 | await waitPoolEvents(pool, PoolEvents.empty, 1) |
| 185 | expect(pool.readyEventEmitted).toBe(false) |
| 186 | expect(pool.workerNodes.length).toBe(pool.info.minSize) |
| 187 | } |
| 188 | // We need to clean up the resources after our test |
| 189 | await pool.destroy() |
| 190 | } |
| 191 | }) |
| 192 | }) |