public void AsyncGetTest()
{
var input = new[] { 1, 1, 1, 1, 1 };
var sched = new TestScheduler();
var delay = TimeSpan.FromSeconds(1.0);
var fixture = new ObservableAsyncMRUCache<int, int>(x => Observable.Return(x*5).Delay(delay, sched), 5, 2, null, sched);
int result = 0;
input.ToObservable(sched).SelectMany<int, int>(x => (IObservable<int>)fixture.AsyncGet(x)).Subscribe(x => result += x);
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(500)));
Assert.Equal(0, result);
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(1200)));
Assert.Equal(25, result);
sched.Start();
Assert.Equal(25, result);
}
public void CacheShouldQueueOnceWeHitOurConcurrentLimit()
{
var input = new[] { 1, 2, 3, 4, 1 };
var sched = new TestScheduler();
var delay = TimeSpan.FromSeconds(1.0);
var fixture = new ObservableAsyncMRUCache<int, int>(x => Observable.Return(x*5).Delay(delay, sched), 5, 2, null, sched);
int result = 0;
input.ToObservable(sched).SelectMany<int, int>(x => (IObservable<int>)fixture.AsyncGet(x)).Subscribe(x => result += x);
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(500)));
Assert.Equal(0, result);
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(1500)));
Assert.Equal(1*5 + 2*5 + 1*5, result);
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(2500)));
Assert.Equal(1*5 + 2*5 + 3*5 + 4*5 + 1*5, result);
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(5000)));
Assert.Equal(1*5 + 2*5 + 3*5 + 4*5 + 1*5, result);
}
public void CacheShouldEatExceptionsAndMarshalThemToObservable()
{
/* This is a bit tricky:
*
* 5,2 complete at t=1000 simultaneously
* 10,0 get queued up, 0 fails immediately (delay() doesn't delay the OnError),
* so 10 completes at t=2000
* The 7 completes at t=3000
*/
var input = new[] { 5, 2, 10, 0/*boom!*/, 7 };
var sched = new TestScheduler();
Observable.Throw<int>(new Exception("Foo")).Subscribe(x => {
Console.WriteLine(x);
}, ex => {
Console.WriteLine(ex);
}, () => {
Console.WriteLine("Completed");
});
var delay = TimeSpan.FromSeconds(1.0);
var fixture = new ObservableAsyncMRUCache<int, int>(x =>
(x == 0 ? Observable.Throw<int>(new Exception("Boom!")) : Observable.Return(10 * x)).Delay(delay, sched), 5, 2, null, sched);
Exception exception = null;
int completed = 0;
input.ToObservable()
.SelectMany(x => fixture.AsyncGet(x))
.Subscribe(x => {
this.Log().InfoFormat("Result = {0}", x);
completed++;
}, ex => exception = exception ?? ex);
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(500)));
Assert.Null(exception);
Assert.Equal(0, completed);
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(1500)));
Assert.NotNull(exception);
Assert.Equal(2, completed);
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(7500)));
Assert.NotNull(exception);
Assert.Equal(4, completed);
this.Log().Info(exception);
}
public void CachedValuesTest()
{
var input = new[] { 1, 2, 1, 3, 1 };
var sched = new TestScheduler();
var delay = TimeSpan.FromSeconds(1.0);
var fixture = new ObservableAsyncMRUCache<int, int>(x => Observable.Return(x*5).Delay(delay, sched), 2, 2);
var results = input.ToObservable().SelectMany(fixture.AsyncGet).CreateCollection();
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(500)));
Assert.Equal(0, fixture.CachedValues().Count());
sched.AdvanceTo(sched.FromTimeSpan(TimeSpan.FromMilliseconds(1500)));
var output = fixture.CachedValues().ToArray();
Assert.IsTrue(output.Length == 2);
Assert.Equal(input.Length, results.Count);
}