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 fullPool = 0
  25     pool.emitter.on('FullPool', () => fullPool++)
  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     expect(fullPool > 1).toBeTruthy()
  31     const res = await TestUtils.waitExits(pool, max - min)
  32     expect(res).toBe(max - min)
  33   })
  34
  35   it('Verify scale thread up and down is working', async () => {
  36     expect(pool.workers.length).toBe(min)
  37     for (let i = 0; i < max * 10; i++) {
  38       pool.execute({ test: 'test' })
  39     }
  40     expect(pool.workers.length).toBe(max)
  41     await TestUtils.waitExits(pool, max - min)
  42     expect(pool.workers.length).toBe(min)
  43     for (let i = 0; i < max * 10; i++) {
  44       pool.execute({ test: 'test' })
  45     }
  46     expect(pool.workers.length).toBe(max)
  47     await TestUtils.waitExits(pool, max - min)
  48     expect(pool.workers.length).toBe(min)
  49   })
  50
  51   it('Shutdown test', async () => {
  52     let closedThreads = 0
  53     pool.workers.forEach(w => {
  54       w.on('exit', () => {
  55         closedThreads++
  56       })
  57     })
  58     await pool.destroy()
  59     expect(closedThreads).toBe(min)
  60   })
  61
  62   it('Validations test', () => {
  63     expect(() => {
  64       const pool1 = new DynamicThreadPool()
  65     }).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).toBeFalsy()
  78   })
  79
  80   it('Verify scale thread up and down is working when long running task is used:hard', async () => {
  81     const longRunningPool = new DynamicThreadPool(
  82       min,
  83       max,
  84       './tests/worker-files/thread/longRunningWorkerHardBehavior.js',
  85       {
  86         errorHandler: e => console.error(e),
  87         onlineHandler: () => console.log('worker is online')
  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   })
  98
  99   it('Verify scale thread up and down is working when long running task is used:soft', async () => {
 100     const longRunningPool = new DynamicThreadPool(
 101       min,
 102       max,
 103       './tests/worker-files/thread/longRunningWorkerSoftBehavior.js',
 104       {
 105         errorHandler: e => console.error(e),
 106         onlineHandler: () => console.log('worker is online')
 107       }
 108     )
 109     expect(longRunningPool.workers.length).toBe(min)
 110     for (let i = 0; i < max * 10; i++) {
 111       longRunningPool.execute({ test: 'test' })
 112     }
 113     expect(longRunningPool.workers.length).toBe(max)
 114     await TestUtils.sleep(1500)
 115     // Here we expect the workers to be at the max size since that the task is still running
 116     expect(longRunningPool.workers.length).toBe(max)
 117   })
 118 })