public void WhenPatientReadmitted_ThenRaiseAlert()
{
var events = new EventStream();
var query =
from discharged in events.Of <PatientLeftHospital>()
from admitted in events.Of <PatientEnteredHospital>()
where
admitted.PatientId == discharged.PatientId &&
(admitted.When - discharged.When).Days < 5
select admitted;
var readmitted = new List <int>();
using (var subscription = query.Subscribe(e => readmitted.Add(e.PatientId)))
{
// Two patients come in.
events.Push(new PatientEnteredHospital {
PatientId = 1, When = new DateTime(2011, 1, 1)
});
events.Push(new PatientEnteredHospital {
PatientId = 2, When = new DateTime(2011, 1, 1)
});
// Both leave same day.
events.Push(new PatientLeftHospital {
PatientId = 1, When = new DateTime(2011, 1, 15)
});
events.Push(new PatientLeftHospital {
PatientId = 2, When = new DateTime(2011, 1, 15)
});
// One comes back before 5 days passed.
events.Push(new PatientEnteredHospital {
PatientId = 1, When = new DateTime(2011, 1, 18)
});
// The other comes back after 10 days passed.
events.Push(new PatientEnteredHospital {
PatientId = 1, When = new DateTime(2011, 1, 25)
});
}
// We should have an alert for patient 1 who came back before 5 days passed.
Assert.Equal(1, readmitted.Count);
Assert.Equal(1, readmitted[0]);
}
public void WhenPushingSubscribedEvent_ThenDoesCallsSubscriber()
{
var stream = new EventStream();
var called = false;
using (var subscription = stream.Of <PatientEnteredHospital>().Subscribe(c => called = true))
{
stream.Push(new PatientEnteredHospital());
}
Assert.True(called);
}
public void WhenPushingEventOnly_ThenCannotSubscribeToEventPattern()
{
var stream = new EventStream();
var called = false;
using (var subscription = stream.Of <IEventPattern <PatientEnteredHospital> >().Subscribe(c => called = true))
{
stream.Push(new PatientEnteredHospital());
}
Assert.False(called);
}
public void WhenPushingEventPattern_ThenCanSubscribeToEventArgsOnlyToo()
{
var stream = new EventStream();
var called = false;
using (var subscription = stream.Of <BaseEvent>().Subscribe(c => called = true))
{
stream.Push(EventPattern.Create(this, new PatientEnteredHospital()));
}
Assert.True(called);
}
public void WhenSubscribingAsGenericInterfaceConcreteArgs_ThenCallsSubscriber()
{
var stream = new EventStream();
var called = false;
using (var subscription = stream.Of <IEventPattern <PatientEnteredHospital> >().Subscribe(c => called = true))
{
stream.Push(EventPattern.Create(this, new PatientEnteredHospital()));
}
Assert.True(called);
}
public void WhenSubscribingAsEventInterface_ThenCallsSubscriber()
{
var stream = new EventStream();
var called = false;
using (var subscription = stream.Of <IBaseEvent>().Subscribe(c => called = true))
{
stream.Push(new PatientEnteredHospital());
}
Assert.True(called);
}
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));
}
