public async Task Creates_item_only_once_when_get_value_is_called_in_parallel()
{
var blockFactoryMethod = true;
var genericBuffer = new GenericBuffer <object>(
factory: () =>
{
while (blockFactoryMethod)
{
}
return(new object());
},
bufferingPeriod: TimeSpan.FromTicks(1),
clock: ClockFactory.FrozenClock());
var tasks = Enumerable.Range(0, 100)
.Select(_ => Task.Run(() => genericBuffer.GetValue()));
blockFactoryMethod = false;
await Task.Delay(200);
object[] results = await Task.WhenAll(tasks);
foreach (var result in results)
{
Assert.Same(results.First(), result);
}
}
public void Throws_ArgumentNullException_when_factory_function_is_null()
{
Func <object, CancellationToken, Task <object> > funcTT = null;
Func <CancellationToken, Task <object> > funcT = null;
Assert.Throws <ArgumentNullException>(() => new AsyncGenericBuffer <object>(
factory: funcTT,
initialValue: Task.FromResult(new object()),
bufferingPeriod: TimeSpan.Zero));
Assert.Throws <ArgumentNullException>(() => new AsyncGenericBuffer <object>(
factory: funcTT,
initialValue: new object(),
bufferingPeriod: TimeSpan.Zero,
ClockFactory.FrozenClock()));
Assert.Throws <ArgumentNullException>(() => new AsyncGenericBuffer <object>(
factory: funcT,
bufferingPeriod: TimeSpan.Zero));
Assert.Throws <ArgumentNullException>(() => new AsyncGenericBuffer <object>(
factory: funcT,
bufferingPeriod: TimeSpan.Zero,
ClockFactory.FrozenClock()));
}
public void Throws_ArgumentNullException_when_factory_function_is_null()
{
Func <object, object> funcTT = null;
Func <object> funcT = null;
// ReSharper disable ExpressionIsAlwaysNull
Assert.Throws <ArgumentNullException>(() => new GenericBuffer <object>(
factory: funcTT,
initialValue: new object(),
bufferingPeriod: TimeSpan.Zero));
Assert.Throws <ArgumentNullException>(() => new GenericBuffer <object>(
factory: funcTT,
initialValue: new object(),
bufferingPeriod: TimeSpan.Zero,
ClockFactory.FrozenClock()));
Assert.Throws <ArgumentNullException>(() => new GenericBuffer <object>(
factory: funcT,
bufferingPeriod: TimeSpan.Zero));
Assert.Throws <ArgumentNullException>(() => new GenericBuffer <object>(
factory: funcT,
bufferingPeriod: TimeSpan.Zero,
ClockFactory.FrozenClock()));
// ReSharper restore ExpressionIsAlwaysNull
}
public void Throws_the_same_exception_as_factory()
{
var expectedException = new Exception();
var genericBuffer = new GenericBuffer <object>(
factory: () => throw expectedException,
bufferingPeriod: TimeSpan.Zero, clock:
ClockFactory.FrozenClock());
Exception actualException = Record.Exception(() => genericBuffer.GetValue());
Assert.Same(expectedException, actualException);
}
public async Task Throws_the_same_exception_as_factory()
{
CancellationToken ct = CancellationToken.None;
var expectedException = new Exception();
var asyncGenericBuffer = new AsyncGenericBuffer <object>(
factory: _ => throw expectedException,
bufferingPeriod: TimeSpan.Zero,
clock: ClockFactory.FrozenClock());
Exception recoredException = await Record.ExceptionAsync(async() => await asyncGenericBuffer.GetValueAsync(ct));
Assert.Same(expectedException, recoredException);
}
public void Reset_forces_creating_a_new_value()
{
var genericBuffer = new GenericBuffer <object>(
factory: () => new object(),
bufferingPeriod: TimeSpan.FromTicks(1),
clock: ClockFactory.FrozenClock());
var firstObject = genericBuffer.GetValue();
Assert.Same(firstObject, genericBuffer.GetValue());
Assert.Same(firstObject, genericBuffer.GetValue());
genericBuffer.Reset();
Assert.NotSame(firstObject, genericBuffer.GetValue());
}
public async Task Reset_forces_creating_a_new_value()
{
CancellationToken ct = CancellationToken.None;
var asyncGenericBuffer = new AsyncGenericBuffer <object>(
factory: _ => Task.FromResult(new object()),
bufferingPeriod: TimeSpan.FromTicks(1),
clock: ClockFactory.FrozenClock());
var firstObject = await asyncGenericBuffer.GetValueAsync(ct);
Assert.Same(firstObject, await asyncGenericBuffer.GetValueAsync(ct));
Assert.Same(firstObject, await asyncGenericBuffer.GetValueAsync(ct));
await asyncGenericBuffer.ResetAsync(ct);
Assert.NotSame(firstObject, await asyncGenericBuffer.GetValueAsync(ct));
}
public void Force_refresh_creates_new_value_even_if_the_old_one_is_still_valid()
{
var genericBuffer = new GenericBuffer <object>(
factory: () => new object(),
bufferingPeriod: TimeSpan.FromTicks(1),
clock: ClockFactory.FrozenClock());
var val1 = genericBuffer.GetValue();
var val2 = genericBuffer.GetValue();
var forced = genericBuffer.ForceRefresh();
var val3 = genericBuffer.GetValue();
var val4 = genericBuffer.GetValue();
Assert.Same(val1, val2);
Assert.NotSame(val1, forced);
Assert.Same(forced, val3);
Assert.Same(val3, val4);
}
public async Task Force_fefresh_creates_new_value_even_if_the_old_one_is_still_valid()
{
CancellationToken ct = CancellationToken.None;
var asyncGenericBuffer = new AsyncGenericBuffer <object>(
factory: _ => Task.FromResult(new object()),
bufferingPeriod: TimeSpan.FromTicks(1),
clock: ClockFactory.FrozenClock());
var val1 = await asyncGenericBuffer.GetValueAsync(ct);
var val2 = await asyncGenericBuffer.GetValueAsync(ct);
var forced = await asyncGenericBuffer.ForceRefreshAsync(ct);
var val3 = await asyncGenericBuffer.GetValueAsync(ct);
var val4 = await asyncGenericBuffer.GetValueAsync(ct);
Assert.Same(val1, val2);
Assert.NotSame(val1, forced);
Assert.Same(forced, val3);
Assert.Same(val3, val4);
}
