tests/pools/selection-strategies/worker-choice-strategy-context.test.js

   1 const { expect } = require('expect')
   2 const sinon = require('sinon')
   3 const {
   4   FixedThreadPool,
   5   DynamicThreadPool,
   6   WorkerChoiceStrategies
   7 } = require('../../../lib/index')
   8 const {
   9   WorkerChoiceStrategyContext
  10 } = require('../../../lib/pools/selection-strategies/worker-choice-strategy-context')
  11 const {
  12   RoundRobinWorkerChoiceStrategy
  13 } = require('../../../lib/pools/selection-strategies/round-robin-worker-choice-strategy')
  14 const {
  15   LessRecentlyUsedWorkerChoiceStrategy
  16 } = require('../../../lib/pools/selection-strategies/less-recently-used-worker-choice-strategy')
  17 const {
  18   FairShareWorkerChoiceStrategy
  19 } = require('../../../lib/pools/selection-strategies/fair-share-worker-choice-strategy')
  20 const {
  21   WeightedRoundRobinWorkerChoiceStrategy
  22 } = require('../../../lib/pools/selection-strategies/weighted-round-robin-worker-choice-strategy')
  23 const {
  24   DynamicPoolWorkerChoiceStrategy
  25 } = require('../../../lib/pools/selection-strategies/dynamic-pool-worker-choice-strategy')
  26
  27 describe('Worker choice strategy context test suite', () => {
  28   const min = 1
  29   const max = 3
  30   let fixedPool, dynamicPool
  31
  32   before(() => {
  33     fixedPool = new FixedThreadPool(
  34       max,
  35       './tests/worker-files/thread/testWorker.js'
  36     )
  37     dynamicPool = new DynamicThreadPool(
  38       min,
  39       max,
  40       './tests/worker-files/thread/testWorker.js'
  41     )
  42   })
  43
  44   afterEach(() => {
  45     sinon.restore()
  46   })
  47
  48   after(async () => {
  49     await fixedPool.destroy()
  50     await dynamicPool.destroy()
  51   })
  52
  53   it('Verify that execute() return the worker chosen by the strategy with fixed pool', () => {
  54     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
  55       fixedPool
  56     )
  57     const WorkerChoiceStrategyStub = sinon.createStubInstance(
  58       RoundRobinWorkerChoiceStrategy,
  59       {
  60         choose: sinon.stub().returns('worker')
  61       }
  62     )
  63     workerChoiceStrategyContext.workerChoiceStrategy = WorkerChoiceStrategyStub
  64     const chosenWorker = workerChoiceStrategyContext.execute()
  65     expect(
  66       workerChoiceStrategyContext.workerChoiceStrategy.choose.calledOnce
  67     ).toBe(true)
  68     expect(chosenWorker).toBe('worker')
  69   })
  70
  71   it('Verify that execute() return the worker chosen by the strategy with dynamic pool', () => {
  72     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
  73       dynamicPool
  74     )
  75     const WorkerChoiceStrategyStub = sinon.createStubInstance(
  76       RoundRobinWorkerChoiceStrategy,
  77       {
  78         choose: sinon.stub().returns('worker')
  79       }
  80     )
  81     workerChoiceStrategyContext.workerChoiceStrategy = WorkerChoiceStrategyStub
  82     const chosenWorker = workerChoiceStrategyContext.execute()
  83     expect(
  84       workerChoiceStrategyContext.workerChoiceStrategy.choose.calledOnce
  85     ).toBe(true)
  86     expect(chosenWorker).toBe('worker')
  87   })
  88
  89   it('Verify that setWorkerChoiceStrategy() works with ROUND_ROBIN and fixed pool', () => {
  90     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
  91       fixedPool
  92     )
  93     workerChoiceStrategyContext.setWorkerChoiceStrategy(
  94       WorkerChoiceStrategies.ROUND_ROBIN
  95     )
  96     expect(workerChoiceStrategyContext.workerChoiceStrategy).toBeInstanceOf(
  97       RoundRobinWorkerChoiceStrategy
  98     )
  99   })
 100
 101   it('Verify that setWorkerChoiceStrategy() works with ROUND_ROBIN and dynamic pool', () => {
 102     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
 103       dynamicPool
 104     )
 105     workerChoiceStrategyContext.setWorkerChoiceStrategy(
 106       WorkerChoiceStrategies.ROUND_ROBIN
 107     )
 108     expect(workerChoiceStrategyContext.workerChoiceStrategy).toBeInstanceOf(
 109       DynamicPoolWorkerChoiceStrategy
 110     )
 111     expect(
 112       workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy
 113     ).toBeInstanceOf(RoundRobinWorkerChoiceStrategy)
 114   })
 115
 116   it('Verify that setWorkerChoiceStrategy() works with LESS_RECENTLY_USED and fixed pool', () => {
 117     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
 118       fixedPool
 119     )
 120     workerChoiceStrategyContext.setWorkerChoiceStrategy(
 121       WorkerChoiceStrategies.LESS_RECENTLY_USED
 122     )
 123     expect(workerChoiceStrategyContext.workerChoiceStrategy).toBeInstanceOf(
 124       LessRecentlyUsedWorkerChoiceStrategy
 125     )
 126   })
 127
 128   it('Verify that setWorkerChoiceStrategy() works with LESS_RECENTLY_USED and dynamic pool', () => {
 129     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
 130       dynamicPool
 131     )
 132     workerChoiceStrategyContext.setWorkerChoiceStrategy(
 133       WorkerChoiceStrategies.LESS_RECENTLY_USED
 134     )
 135     expect(workerChoiceStrategyContext.workerChoiceStrategy).toBeInstanceOf(
 136       DynamicPoolWorkerChoiceStrategy
 137     )
 138     expect(
 139       workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy
 140     ).toBeInstanceOf(LessRecentlyUsedWorkerChoiceStrategy)
 141   })
 142
 143   it('Verify that setWorkerChoiceStrategy() works with FAIR_SHARE and fixed pool', () => {
 144     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
 145       fixedPool
 146     )
 147     workerChoiceStrategyContext.setWorkerChoiceStrategy(
 148       WorkerChoiceStrategies.FAIR_SHARE
 149     )
 150     expect(workerChoiceStrategyContext.workerChoiceStrategy).toBeInstanceOf(
 151       FairShareWorkerChoiceStrategy
 152     )
 153   })
 154
 155   it('Verify that setWorkerChoiceStrategy() works with FAIR_SHARE and dynamic pool', () => {
 156     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
 157       dynamicPool
 158     )
 159     workerChoiceStrategyContext.setWorkerChoiceStrategy(
 160       WorkerChoiceStrategies.FAIR_SHARE
 161     )
 162     expect(workerChoiceStrategyContext.workerChoiceStrategy).toBeInstanceOf(
 163       DynamicPoolWorkerChoiceStrategy
 164     )
 165     expect(
 166       workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy
 167     ).toBeInstanceOf(FairShareWorkerChoiceStrategy)
 168   })
 169
 170   it('Verify that setWorkerChoiceStrategy() works with WEIGHTED_ROUND_ROBIN and fixed pool', () => {
 171     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
 172       fixedPool
 173     )
 174     workerChoiceStrategyContext.setWorkerChoiceStrategy(
 175       WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
 176     )
 177     expect(workerChoiceStrategyContext.workerChoiceStrategy).toBeInstanceOf(
 178       WeightedRoundRobinWorkerChoiceStrategy
 179     )
 180   })
 181
 182   it('Verify that setWorkerChoiceStrategy() works with WEIGHTED_ROUND_ROBIN and dynamic pool', () => {
 183     const workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
 184       dynamicPool
 185     )
 186     workerChoiceStrategyContext.setWorkerChoiceStrategy(
 187       WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN
 188     )
 189     expect(workerChoiceStrategyContext.workerChoiceStrategy).toBeInstanceOf(
 190       DynamicPoolWorkerChoiceStrategy
 191     )
 192     expect(
 193       workerChoiceStrategyContext.workerChoiceStrategy.workerChoiceStrategy
 194     ).toBeInstanceOf(WeightedRoundRobinWorkerChoiceStrategy)
 195   })
 196 })