Exemplo n.º 1
0
        public void WhenPushingNullEvent_ThenThrows()
        {
            var stream = new EventStream();

            Assert.Throws <ArgumentNullException>(() => stream.Push <object>(null));
        }
Exemplo n.º 2
0
        public void WhenUserLoginFailsTooFast_ThenLockUserAccount()
        {
            var seconds = TimeSpan.FromSeconds(1).Ticks;
            var events  = new EventStream();

            // Here we use the test scheduler to simulate time passing by
            // because we have a dependency on time because of the Buffer
            // method.
            var scheduler  = new TestScheduler();
            var observable = scheduler.CreateColdObservable(
                // Two users attempt to log in, 4 times in a row
                new Recorded <Notification <LoginFailure> >(10 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 1
            })),
                new Recorded <Notification <LoginFailure> >(10 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 2
            })),
                new Recorded <Notification <LoginFailure> >(20 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 1
            })),
                new Recorded <Notification <LoginFailure> >(20 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 2
            })),
                new Recorded <Notification <LoginFailure> >(30 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 1
            })),
                new Recorded <Notification <LoginFailure> >(30 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 2
            })),
                new Recorded <Notification <LoginFailure> >(40 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 1
            })),
                new Recorded <Notification <LoginFailure> >(40 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 2
            })),

                // User 2 attems one more time within the 1' window
                new Recorded <Notification <LoginFailure> >(45 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 2
            })),

                // User 1 pulls out the paper where he wrote his pwd ;), so he takes longer
                new Recorded <Notification <LoginFailure> >(75 * seconds, Notification.CreateOnNext(new LoginFailure {
                UserId = 1
            }))
                );

            // This subscription bridges the scheduler-driven
            // observable with our event stream, causing us
            // to publish events as they are "raised" by the
            // test scheduler.
            observable.Subscribe(failure => events.Push(failure));

            var query = events.Of <LoginFailure>()
                        // Sliding windows 1' long, every 10''
                        .Buffer(TimeSpan.FromMinutes(1), TimeSpan.FromSeconds(10), scheduler)
                        // From all failure values
                        .SelectMany(failures => failures
                        // Group the failures by user
                                    .GroupBy(failure => failure.UserId)
                        // Only grab those failures with more than 5 in the 1' window
                                    .Where(group => group.Count() >= 5)
                        // Return the user id that failed to log in
                                    .Select(group => group.Key));

            var blocked = new List <int>();

            using (var subscription = query.Subscribe(userId => blocked.Add(userId)))
            {
                // Here we could advance the scheduler half way and test intermediate
                // state if needed. We go all the way past the end of our login failures.
                scheduler.AdvanceTo(100 * seconds);
            }

            // We should have only user # 2 in the list.
            Assert.False(blocked.Contains(1));
            Assert.True(blocked.Contains(2));
        }