+ it("Verify that pool event emitter 'backPressure' event can register a callback", async () => {
+ const pool = new FixedThreadPool(
+ numberOfWorkers,
+ './tests/worker-files/thread/testWorker.js',
+ {
+ enableTasksQueue: true
+ }
+ )
+ sinon.stub(pool, 'hasBackPressure').returns(true)
+ const promises = new Set()
+ let poolBackPressure = 0
+ let poolInfo
+ pool.emitter.on(PoolEvents.backPressure, (info) => {
+ ++poolBackPressure
+ poolInfo = info
+ })
+ for (let i = 0; i < numberOfWorkers * 2; i++) {
+ promises.add(pool.execute())
+ }
+ await Promise.all(promises)
+ expect(poolBackPressure).toBe(2)
+ expect(poolInfo).toStrictEqual({
+ version,
+ type: PoolTypes.fixed,
+ worker: WorkerTypes.thread,
+ ready: expect.any(Boolean),
+ strategy: WorkerChoiceStrategies.ROUND_ROBIN,
+ minSize: expect.any(Number),
+ maxSize: expect.any(Number),
+ workerNodes: expect.any(Number),
+ idleWorkerNodes: expect.any(Number),
+ busyWorkerNodes: expect.any(Number),
+ executedTasks: expect.any(Number),
+ executingTasks: expect.any(Number),
+ maxQueuedTasks: expect.any(Number),
+ queuedTasks: expect.any(Number),
+ backPressure: true,
+ failedTasks: expect.any(Number)
+ })
+ expect(pool.hasBackPressure.called).toBe(true)
+ await pool.destroy()
+ })
+