Java Code Examples for reactor.core.scheduler.Schedulers#newSingle()

@Override
public Flux<Employee> readEmployeesByAscLastName() {
	Scheduler subWorker = Schedulers.newSingle("sub-thread");
	Scheduler pubWorker = Schedulers.newSingle("pub-thread");
	Supplier<Flux<Employee>> deferredTask = ()->{
		System.out.println("flux:defer task executor: " + Thread.currentThread().getName());
		System.out.println("flux:defer task executor login: " + SecurityContextHolder.getContext().getAuthentication().getPrincipal());
		return Flux.fromIterable(employeeDaoImpl.getEmployees());
	};
	Comparator<Employee> descLName = (e1, e2) -> {
		System.out.println("flux:sort task executor: " + Thread.currentThread().getName());
		System.out.println("flux:sort task executor login: " + SecurityContextHolder.getContext().getAuthentication().getPrincipal());
		return e1.getLastName().compareTo(e2.getLastName());
	};
	Flux<Employee> deferred = Flux.defer(deferredTask).sort(descLName).subscribeOn(subWorker).publishOn(pubWorker);
	return deferred;
}
 

@Override
public Flux<Employee> readEmployeesByDescAge() {
	Scheduler subWorker = Schedulers.newSingle("sub-thread");
	Scheduler pubWorker = Schedulers.newSingle("pub-thread");
	Supplier<Flux<Employee>> deferredTask = ()->{
		System.out.println("flux:defer task executor: "+ Thread.currentThread().getName());
		System.out.println("flux:defer task executor login: " + SecurityContextHolder.getContext().getAuthentication().getPrincipal());
		return Flux.fromIterable(employeeDaoImpl.getEmployees());
	};
	Comparator<Employee> descAge = (e1, e2) -> {
		System.out.println("flux:sort task executor: " + Thread.currentThread().getName());
		System.out.println("flux:sort task executor login: " + SecurityContextHolder.getContext().getAuthentication().getPrincipal());
		if(e1.getAge().compareTo(e2.getAge()) == 0){
			return 0;
		} else if(e1.getAge().compareTo(e2.getAge()) > 0){
			return -1;
		} else return 1;
	};
	Flux<Employee> deferred = Flux.defer(deferredTask).sort(descAge).subscribeOn(subWorker).publishOn(pubWorker);
	return deferred;
}
 

@Test
void consistentThreadDeliveringWhenHasElements() throws InterruptedException {
    Scheduler deliveryScheduler = Schedulers.newSingle("delivery");
    AtomicReference<String> threadName = new AtomicReference<>();
    Scheduler acquireScheduler = Schedulers.newSingle("acquire");
    PoolConfig<PoolableTest> testConfig = poolableTestConfig(1, 1,
            Mono.fromCallable(PoolableTest::new)
                .subscribeOn(Schedulers.newParallel("poolable test allocator")),
            deliveryScheduler);
    SimpleLifoPool<PoolableTest> pool = new SimpleLifoPool<>(testConfig);

    //the pool is started with one available element
    //we prepare to acquire it
    Mono<PoolableTest> borrower = Mono.fromDirect(pool.withPoolable(Mono::just));
    CountDownLatch latch = new CountDownLatch(1);

    //we actually request the acquire from a separate thread and see from which thread the element was delivered
    acquireScheduler.schedule(() -> borrower.subscribe(v -> threadName.set(Thread.currentThread().getName()), e -> latch.countDown(), latch::countDown));
    latch.await(1, TimeUnit.SECONDS);

    assertThat(threadName.get())
            .startsWith("delivery-");
}
 

@Override
public Flux<Employee> readEmployeesFlux(int age) {
	Scheduler subWorker = Schedulers.newSingle("sub-thread");
	Scheduler pubWorker = Schedulers.newSingle("pub-thread");
	Predicate<Employee> validAge = (e) -> {
		System.out.println("flux:filter task executor: " + Thread.currentThread().getName());
		System.out.println("flux:filter task executor login: " + SecurityContextHolder.getContext().getAuthentication().getPrincipal());
		return e.getAge() > age;
	};
	Supplier<Flux<Employee>> deferredTask = ()->{
		System.out.println("flux:defer task executor: " + Thread.currentThread().getName());
		System.out.println("flux:defer task executor login: " + SecurityContextHolder.getContext().getAuthentication().getPrincipal());
		return Flux.fromIterable(employeeDaoImpl.getEmployees());
	};
	Flux<Employee> deferred = Flux.defer(deferredTask).filter(validAge).subscribeOn(subWorker).publishOn(pubWorker);
	return deferred;
}
 

@Test
void consistentThreadDeliveringWhenNoElementsButNotFull() throws InterruptedException {
    Scheduler deliveryScheduler = Schedulers.newSingle("delivery");
    AtomicReference<String> threadName = new AtomicReference<>();
    Scheduler acquireScheduler = Schedulers.newSingle("acquire");
    PoolConfig<PoolableTest> testConfig = poolableTestConfig(0, 1,
            Mono.fromCallable(PoolableTest::new)
                .subscribeOn(Schedulers.newParallel("poolable test allocator")),
            deliveryScheduler);
    SimpleLifoPool<PoolableTest> pool = new SimpleLifoPool<>(testConfig);

    //the pool is started with no elements, and has capacity for 1
    //we prepare to acquire, which would allocate the element
    Mono<PoolableTest> borrower = Mono.fromDirect(pool.withPoolable(Mono::just));
    CountDownLatch latch = new CountDownLatch(1);

    //we actually request the acquire from a separate thread, but the allocation also happens in a dedicated thread
    //we look at which thread the element was delivered from
    acquireScheduler.schedule(() -> borrower.subscribe(v -> threadName.set(Thread.currentThread().getName()), e -> latch.countDown(), latch::countDown));
    latch.await(1, TimeUnit.SECONDS);

    assertThat(threadName.get())
            .startsWith("delivery-");
}
 

@Test
void defaultThreadDeliveringWhenHasElements() throws InterruptedException {
    AtomicReference<String> threadName = new AtomicReference<>();
    Scheduler acquireScheduler = Schedulers.newSingle("acquire");
    PoolConfig<PoolableTest> testConfig = poolableTestConfig(1, 1,
            Mono.fromCallable(PoolableTest::new)
                .subscribeOn(Schedulers.newParallel("poolable test allocator")));
    SimpleFifoPool<PoolableTest> pool = new SimpleFifoPool<>(testConfig);
    pool.warmup().block();

    //the pool is started and warmed up with one available element
    //we prepare to acquire it
    Mono<PooledRef<PoolableTest>> borrower = pool.acquire();
    CountDownLatch latch = new CountDownLatch(1);

    //we actually request the acquire from a separate thread and see from which thread the element was delivered
    acquireScheduler.schedule(() -> borrower.subscribe(v -> threadName.set(Thread.currentThread().getName()), e -> latch.countDown(), latch::countDown));
    latch.await(1, TimeUnit.SECONDS);

    assertThat(threadName.get())
            .startsWith("acquire-");
}
 

@Test
void defaultThreadDeliveringWhenNoElementsButNotFull() throws InterruptedException {
    AtomicReference<String> threadName = new AtomicReference<>();
    Scheduler acquireScheduler = Schedulers.newSingle("acquire");
    PoolConfig<PoolableTest> testConfig = poolableTestConfig(0, 1,
            Mono.fromCallable(PoolableTest::new)
                .subscribeOn(Schedulers.newParallel("poolable test allocator")));
    SimpleLifoPool<PoolableTest> pool = new SimpleLifoPool<>(testConfig);

    //the pool is started with no elements, and has capacity for 1
    //we prepare to acquire, which would allocate the element
    Mono<PooledRef<PoolableTest>> borrower = pool.acquire();
    CountDownLatch latch = new CountDownLatch(1);

    //we actually request the acquire from a separate thread, but the allocation also happens in a dedicated thread
    //we look at which thread the element was delivered from
    acquireScheduler.schedule(() -> borrower.subscribe(v -> threadName.set(Thread.currentThread().getName()), e -> latch.countDown(), latch::countDown));
    latch.await(1, TimeUnit.SECONDS);

    assertThat(threadName.get())
            .startsWith("poolable test allocator-");
}
 

@Test
void consistentThreadDeliveringWhenHasElements() throws InterruptedException {
    Scheduler deliveryScheduler = Schedulers.newSingle("delivery");
    AtomicReference<String> threadName = new AtomicReference<>();
    Scheduler acquireScheduler = Schedulers.newSingle("acquire");
    PoolConfig<PoolableTest> testConfig = poolableTestConfig(1, 1,
            Mono.fromCallable(PoolableTest::new)
                .subscribeOn(Schedulers.newParallel("poolable test allocator")),
            deliveryScheduler);
    SimpleFifoPool<PoolableTest> pool = new SimpleFifoPool<>(testConfig);

    //the pool is started with one available element
    //we prepare to acquire it
    Mono<PooledRef<PoolableTest>> borrower = pool.acquire();
    CountDownLatch latch = new CountDownLatch(1);

    //we actually request the acquire from a separate thread and see from which thread the element was delivered
    acquireScheduler.schedule(() -> borrower.subscribe(v -> threadName.set(Thread.currentThread().getName()), e -> latch.countDown(), latch::countDown));
    latch.await(1, TimeUnit.SECONDS);

    assertThat(threadName.get())
            .startsWith("delivery-");
}
 

@Override
public Flux<Employee> createPubAndMain() {
	Scheduler pubWorker = Schedulers.newSingle("pub-thread");
	Predicate<Employee> validAge = (e) -> {
		System.out.println("filter thread " +Thread.currentThread().getName());
		return e.getAge() > 25;
	};
	Supplier<Flux<Employee>> deferredTask = ()->{
		System.out.println("defer thread "+Thread.currentThread().getName());
		return Flux.fromIterable(employeeDaoImpl.getEmployees());
	};
	Flux<Employee> deferred = Flux.defer(deferredTask).publishOn(pubWorker).filter(validAge);
	return deferred;
}
 

@Test
public void rejectedOnNextLeadsToOnError() {
	Scheduler scheduler = Schedulers.newSingle("rejectedOnNextLeadsToOnError");
	scheduler.dispose();

	StepVerifier.create(Flux.just(1, 2, 3)
	                        .bufferTimeout(4, Duration.ofMillis(500), scheduler))
	            .expectError(RejectedExecutionException.class)
	            .verify(Duration.ofSeconds(1));
}
 

@Test
void consistentThreadDeliveringWhenNoElementsAndFull() throws InterruptedException {
    Scheduler deliveryScheduler = Schedulers.newSingle("delivery");
    AtomicReference<String> threadName = new AtomicReference<>();
    Scheduler acquireScheduler = Schedulers.newSingle("acquire");
    Scheduler releaseScheduler = Schedulers.fromExecutorService(
            Executors.newSingleThreadScheduledExecutor((r -> new Thread(r,"release"))));
    PoolConfig<PoolableTest> testConfig = poolableTestConfig(1, 1,
            Mono.fromCallable(PoolableTest::new)
                .subscribeOn(Schedulers.newParallel("poolable test allocator")),
            deliveryScheduler);
    SimpleFifoPool<PoolableTest> pool = new SimpleFifoPool<>(testConfig);

    //the pool is started with one elements, and has capacity for 1.
    //we actually first acquire that element so that next acquire will wait for a release
    PooledRef<PoolableTest> uniqueSlot = pool.acquire().block();
    assertThat(uniqueSlot).isNotNull();

    //we prepare next acquire
    Mono<PooledRef<PoolableTest>> borrower = pool.acquire();
    CountDownLatch latch = new CountDownLatch(1);

    //we actually perform the acquire from its dedicated thread, capturing the thread on which the element will actually get delivered
    acquireScheduler.schedule(() -> borrower.subscribe(v -> threadName.set(Thread.currentThread().getName()),
            e -> latch.countDown(), latch::countDown));
    //after a short while, we release the acquired unique element from a third thread
    releaseScheduler.schedule(uniqueSlot.release()::block, 500, TimeUnit.MILLISECONDS);
    latch.await(1, TimeUnit.SECONDS);

    assertThat(threadName.get())
            .startsWith("delivery-");
}
 

@Test
void consistentThreadDeliveringWhenNoElementsAndFull() throws InterruptedException {
    Scheduler deliveryScheduler = Schedulers.newSingle("delivery");
    AtomicReference<String> threadName = new AtomicReference<>();
    Scheduler acquireScheduler = Schedulers.newSingle("acquire");
    Scheduler releaseScheduler = Schedulers.fromExecutorService(
            Executors.newSingleThreadScheduledExecutor((r -> new Thread(r,"release"))));
    PoolConfig<PoolableTest> testConfig = poolableTestConfig(1, 1,
            Mono.fromCallable(PoolableTest::new)
                .subscribeOn(Schedulers.newParallel("poolable test allocator")),
            deliveryScheduler);
    SimpleLifoPool<PoolableTest> pool = new SimpleLifoPool<>(testConfig);

    //the pool is started with one elements, and has capacity for 1.
    //we actually first acquire that element so that next acquire will wait for a release
    PooledRef<PoolableTest> uniqueSlot = pool.acquire().block();
    assertThat(uniqueSlot).isNotNull();

    //we prepare next acquire
    Mono<PoolableTest> borrower = Mono.fromDirect(pool.withPoolable(Mono::just));
    CountDownLatch latch = new CountDownLatch(1);

    //we actually perform the acquire from its dedicated thread, capturing the thread on which the element will actually get delivered
    acquireScheduler.schedule(() -> borrower.subscribe(v -> threadName.set(Thread.currentThread().getName()),
            e -> latch.countDown(), latch::countDown));
    //after a short while, we release the acquired unique element from a third thread
    releaseScheduler.schedule(uniqueSlot.release()::block, 500, TimeUnit.MILLISECONDS);
    latch.await(1, TimeUnit.SECONDS);

    assertThat(threadName.get())
            .startsWith("delivery-");
}
 

/**
 * @param services list of services to activate in the desired activation order
 */
public LeaderActivationCoordinator(LeaderActivationConfiguration configuration,
                                   List<LeaderActivationListener> services,
                                   Consumer<Throwable> deactivationCallback,
                                   ClusterMembershipService membershipService,
                                   TitusRuntime titusRuntime) {
    this.configuration = configuration;
    this.services = services;
    this.deactivationCallback = deactivationCallback;
    this.membershipService = membershipService;
    this.localMemberId = membershipService.getLocalClusterMember().getCurrent().getMemberId();
    this.clock = titusRuntime.getClock();

    this.registry = titusRuntime.getRegistry();
    this.stateMetricFsm = SpectatorExt.fsmMetrics(
            registry.createId(METRIC_ROOT + "state"),
            s -> s == State.Deactivated,
            State.Awaiting,
            registry
    );
    this.inActiveStateTimeId = registry.createId(METRIC_ROOT + "inActiveStateTime");
    PolledMeter.using(registry).withId(inActiveStateTimeId).monitorValue(this, self ->
            (self.stateRef.get() == State.ElectedLeader && activationTimestamp > 0) ? self.clock.wallTime() - self.activationTimestamp : 0
    );

    // We create the thread here, as the default one is NonBlocking, and we allow React blocking subscriptions in
    // the activation phase.
    this.scheduler = Schedulers.newSingle(r -> {
        Thread thread = new Thread(r, "LeaderActivationCoordinator");
        thread.setDaemon(true);
        return thread;
    });
    this.scheduleRef = titusRuntime.getLocalScheduler().scheduleMono(
            SCHEDULE_DESCRIPTOR.toBuilder()
                    .withInterval(Duration.ofMillis(configuration.getLeaderCheckIntervalMs()))
                    .withTimeout(Duration.ofMillis(configuration.getLeaderActivationTimeout()))
                    .build(),
            context -> refresh(),
            scheduler
    );
}
 

public Mono<ServerResponse> loginDetailsById(ServerRequest req) {
	Scheduler subWorker = Schedulers.newSingle("sub-thread");
	Mono<LoginDetails> login = Mono.defer(() -> Mono.justOrEmpty(logindetailsServiceImpl.findLoginById(Integer.parseInt(req.pathVariable("id"))))).subscribeOn(subWorker);
	return ok().contentType(MediaType.APPLICATION_STREAM_JSON).body(login, LoginDetails.class)
			.switchIfEmpty(ServerResponse.notFound().build());
}
 

public Mono<ServerResponse> saveDepartmentMono(ServerRequest req) {
  	Scheduler subWorker = Schedulers.newSingle("sub-thread");
  	Mono<Department> department = req.bodyToMono(Department.class).doOnNext(departmentServiceImpl::saveDeptRec).subscribeOn(subWorker);
     	return ok().contentType(MediaType.APPLICATION_STREAM_JSON).build(department.then());
}
 

void consistentThreadDeliveringWhenNoElementsAndFullAndRaceDrain(int i) throws InterruptedException {
    Scheduler deliveryScheduler = Schedulers.newSingle("delivery");
    AtomicReference<String> threadName = new AtomicReference<>();
    AtomicInteger newCount = new AtomicInteger();

    Scheduler acquire1Scheduler = Schedulers.newSingle("acquire1");
    Scheduler racerReleaseScheduler = Schedulers.fromExecutorService(
            Executors.newSingleThreadScheduledExecutor((r -> new Thread(r,"racerRelease"))));
    Scheduler racerAcquireScheduler = Schedulers.newSingle("racerAcquire");

    PoolConfig<PoolableTest> testConfig = poolableTestConfig(1, 1,
            Mono.fromCallable(() -> new PoolableTest(newCount.getAndIncrement()))
                .subscribeOn(Schedulers.newParallel("poolable test allocator")),
            deliveryScheduler);
    SimpleFifoPool<PoolableTest> pool = new SimpleFifoPool<>(testConfig);

    //the pool is started with one elements, and has capacity for 1.
    //we actually first acquire that element so that next acquire will wait for a release
    PooledRef<PoolableTest> uniqueSlot = pool.acquire().block();
    assertThat(uniqueSlot).isNotNull();

    //we prepare next acquire
    Mono<PooledRef<PoolableTest>> borrower = pool.acquire();
    CountDownLatch latch = new CountDownLatch(1);

    //we actually perform the acquire from its dedicated thread, capturing the thread on which the element will actually get delivered
    acquire1Scheduler.schedule(() -> borrower.subscribe(v -> threadName.set(Thread.currentThread().getName())
            , e -> latch.countDown(), latch::countDown));

    //in parallel, we'll both attempt a second acquire AND release the unique element (each on their dedicated threads
    Mono<PooledRef<PoolableTest>> otherBorrower = pool.acquire();
    racerAcquireScheduler.schedule(() -> otherBorrower.subscribe().dispose(), 100, TimeUnit.MILLISECONDS);
    racerReleaseScheduler.schedule(uniqueSlot.release()::block, 100, TimeUnit.MILLISECONDS);
    latch.await(1, TimeUnit.SECONDS);

    //we expect that, consistently, the poolable is delivered on a `delivery` thread
    assertThat(threadName.get()).as("round #" + i).startsWith("delivery-");

    //we expect that only 1 element was created
    assertThat(newCount).as("elements created in round " + i).hasValue(1);
}
 

/**
 * <pre>
 *                 forkStream
 *                 /        \      < - - - int
 *                v          v
 * persistenceStream        computationStream
 *                 \        /      < - - - List< String >
 *                  v      v
 *                 joinStream      < - - - String
 *                 splitStream
 *             observedSplitStream
 * </pre>
    * @throws Exception for convenience
 */
@Test(timeout = TIMEOUT)
public void multiplexUsingDispatchersAndSplit() throws Exception {

	final FluxIdentityProcessor<Integer> forkEmitterProcessor = Processors.multicast();

	final FluxIdentityProcessor<Integer> computationEmitterProcessor = Processors.more().multicast(false);

	Scheduler computation = Schedulers.newSingle("computation");
	Scheduler persistence = Schedulers.newSingle("persistence");
	Scheduler forkJoin = Schedulers.newParallel("forkJoin", 2);

	final Flux<List<String>> computationStream =
			computationEmitterProcessor.publishOn(computation)
			                      .map(i -> {
				                      final List<String> list = new ArrayList<>(i);
				                      for (int j = 0; j < i; j++) {
					                      list.add("i" + j);
				                      }
				                      return list;
			                      })
			                      .doOnNext(ls -> println("Computed: ", ls))
			                      .log("computation");

	final FluxIdentityProcessor<Integer> persistenceEmitterProcessor = Processors.more().multicast(false);

	final Flux<List<String>> persistenceStream =
			persistenceEmitterProcessor.publishOn(persistence)
			                      .doOnNext(i -> println("Persisted: ", i))
			                      .map(i -> Collections.singletonList("done" + i))
			                      .log("persistence");

	Flux<Integer> forkStream = forkEmitterProcessor.publishOn(forkJoin)
	                                             .log("fork");

	forkStream.subscribe(computationEmitterProcessor);
	forkStream.subscribe(persistenceEmitterProcessor);

	final Flux<List<String>> joinStream = Flux.zip(computationStream, persistenceStream, (a, b) -> Arrays.asList(a, b))
	                                                .publishOn(forkJoin)
	                                                .map(listOfLists -> {
		                                               listOfLists.get(0)
		                                                          .addAll(listOfLists.get(1));
		                                               return listOfLists.get(0);
	                                               })
	                                                .log("join");

	final Semaphore doneSemaphore = new Semaphore(0);

	final MonoProcessor<List<String>> listPromise = joinStream.flatMap(Flux::fromIterable)
	                                                 .log("resultStream")
	                                                 .collectList()
	                                                 .doOnTerminate(doneSemaphore::release)
	                                                 .toProcessor();
	listPromise.subscribe();

	forkEmitterProcessor.onNext(1);
	forkEmitterProcessor.onNext(2);
	forkEmitterProcessor.onNext(3);
	forkEmitterProcessor.onComplete();

	List<String> res = listPromise.block(Duration.ofSeconds(5));
	assertEquals(Arrays.asList("i0", "done1", "i0", "i1", "done2", "i0", "i1", "i2", "done3"), res);

	forkJoin.dispose();
	persistence.dispose();
	computation.dispose();
}
 

public Mono<ServerResponse> saveDepartmentMono(ServerRequest req) {
  	Scheduler subWorker = Schedulers.newSingle("sub-thread");
  	Mono<Department> department = req.bodyToMono(Department.class).doOnNext(departmentServiceImpl::saveDeptRec).subscribeOn(subWorker);
     	return ok().contentType(MediaType.APPLICATION_STREAM_JSON).build(department.then());
}
 

public Mono<ServerResponse> saveUserdetailsMono(ServerRequest req) {
  	Scheduler subWorker = Schedulers.newSingle("sub-thread");
  	Mono<UserDetails> loginDetails = req.bodyToMono(UserDetails.class).doOnNext(userdetailsServiceImpl::saveUserdetails).subscribeOn(subWorker);
     	return ok().contentType(MediaType.APPLICATION_STREAM_JSON).build(loginDetails.then());
}
 

void consistentThreadDeliveringWhenNoElementsAndFullAndRaceDrain(int i) throws InterruptedException {
    Scheduler allocatorScheduler = Schedulers.newParallel("poolable test allocator");
    Scheduler deliveryScheduler = Schedulers.newSingle("delivery");
    Scheduler acquire1Scheduler = Schedulers.newSingle("acquire1");
    Scheduler racerScheduler = Schedulers.fromExecutorService(
            Executors.newFixedThreadPool(2, (r -> new Thread(r,"racer"))));

    try {
        AtomicReference<String> threadName = new AtomicReference<>();
        AtomicInteger newCount = new AtomicInteger();


        PoolConfig<PoolableTest> testConfig = poolableTestConfig(1, 1,
                Mono.fromCallable(() -> new PoolableTest(newCount.getAndIncrement()))
                    .subscribeOn(allocatorScheduler),
                deliveryScheduler);
        SimpleLifoPool<PoolableTest> pool = new SimpleLifoPool<>(testConfig);

        //the pool is started with one elements, and has capacity for 1.
        //we actually first acquire that element so that next acquire will wait for a release
        PooledRef<PoolableTest> uniqueSlot = pool.acquire().block();
        assertThat(uniqueSlot).isNotNull();

        //we prepare next acquire
        Mono<PoolableTest> firstBorrower = Mono.fromDirect(pool.withPoolable(Mono::just));
        Mono<PoolableTest> otherBorrower = Mono.fromDirect(pool.withPoolable(Mono::just));

        CountDownLatch latch = new CountDownLatch(3);

        //we actually perform the acquire from its dedicated thread, capturing the thread on which the element will actually get delivered
        acquire1Scheduler.schedule(() -> firstBorrower.subscribe(v -> threadName.set(Thread.currentThread().getName())
                , e -> latch.countDown(), latch::countDown));

        //in parallel, we'll race a second acquire AND release the unique element (each on their dedicated threads)
        //since LIFO we expect that if the release loses, it will server acquire1
        RaceTestUtils.race(
                () -> otherBorrower.subscribe(v -> threadName.set(Thread.currentThread().getName())
                        , e -> latch.countDown(), latch::countDown),
                () -> {
                    uniqueSlot.release().block();
                    latch.countDown();
                },
                racerScheduler);
        latch.await(1, TimeUnit.SECONDS);

        //we expect that, consistently, the poolable is delivered on a `delivery` thread
        assertThat(threadName.get()).as("round #" + i).startsWith("delivery-");

        //2 elements MIGHT be created if the first acquire wins (since we're in auto-release mode)
        assertThat(newCount.get()).as("1 or 2 elements created in round " + i).isIn(1, 2);
    }
    finally {
        allocatorScheduler.dispose();
        deliveryScheduler.dispose();
        acquire1Scheduler.dispose();
        racerScheduler.dispose();
    }
}