tests/pools/thread/dynamic.test.js

   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 numberOfExitEvents = await TestUtils.waitExits(pool, max - min)
  34     expect(numberOfExitEvents).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     const exitPromise = TestUtils.waitExits(pool, min)
  55     await pool.destroy()
  56     const numberOfExitEvents = await exitPromise
  57     expect(numberOfExitEvents).toBe(min)
  58   })
  59
  60   it('Validation of inputs test', () => {
  61     expect(() => new DynamicThreadPool(min)).toThrowError(
  62       new Error('Please specify a file with a worker implementation')
  63     )
  64   })
  65
  66   it('Should work even without opts in input', async () => {
  67     const pool1 = new DynamicThreadPool(
  68       1,
  69       1,
  70       './tests/worker-files/thread/testWorker.js'
  71     )
  72     const res = await pool1.execute({ test: 'test' })
  73     expect(res).toBeDefined()
  74     expect(res).toBeFalsy()
  75     // We need to clean up the resources after our test
  76     await pool1.destroy()
  77   })
  78
  79   it('Verify scale thread up and down is working when long running task is used:hard', async () => {
  80     const longRunningPool = new DynamicThreadPool(
  81       min,
  82       max,
  83       './tests/worker-files/thread/longRunningWorkerHardBehavior.js',
  84       {
  85         errorHandler: e => console.error(e),
  86         onlineHandler: () => console.log('long running worker is online'),
  87         exitHandler: () => console.log('long running worker exited')
  88       }
  89     )
  90     expect(longRunningPool.workers.length).toBe(min)
  91     for (let i = 0; i < max * 10; i++) {
  92       longRunningPool.execute({ test: 'test' })
  93     }
  94     expect(longRunningPool.workers.length).toBe(max)
  95     await TestUtils.waitExits(longRunningPool, max - min)
  96     expect(longRunningPool.workers.length).toBe(min)
  97     // We need to clean up the resources after our test
  98     await longRunningPool.destroy()
  99   })
 100
 101   it('Verify scale thread up and down is working when long running task is used:soft', async () => {
 102     const longRunningPool = new DynamicThreadPool(
 103       min,
 104       max,
 105       './tests/worker-files/thread/longRunningWorkerSoftBehavior.js',
 106       {
 107         errorHandler: e => console.error(e),
 108         onlineHandler: () => console.log('long running worker is online'),
 109         exitHandler: () => console.log('long running worker exited')
 110       }
 111     )
 112     expect(longRunningPool.workers.length).toBe(min)
 113     for (let i = 0; i < max * 10; i++) {
 114       longRunningPool.execute({ test: 'test' })
 115     }
 116     expect(longRunningPool.workers.length).toBe(max)
 117     await TestUtils.sleep(1500)
 118     // Here we expect the workers to be at the max size since that the task is still running
 119     expect(longRunningPool.workers.length).toBe(max)
 120     // We need to clean up the resources after our test
 121     await longRunningPool.destroy()
 122   })
 123
 124   it('Verify that a pool with zero worker can be instantiated', async () => {
 125     const pool = new DynamicThreadPool(
 126       0,
 127       max,
 128       './tests/worker-files/thread/testWorker.js'
 129     )
 130     expect(pool).toBeInstanceOf(DynamicThreadPool)
 131     // We need to clean up the resources after our test
 132     await pool.destroy()
 133   })
 134 })