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 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 void Returns_new_value_after_buffering_period_passes()
{
DateTime dateTime = DateTime.MinValue;
var bufferingPeriod = TimeSpan.FromTicks(1);
var incrementalClock = new IncrementalClock();
int executions = 0;
var genericBuffer = new GenericBuffer <int>(factory: () => executions++, bufferingPeriod: bufferingPeriod, clock: () => dateTime);
Assert.Equal(0, genericBuffer.GetValue()); // Before buffering period is past
dateTime += bufferingPeriod;
Assert.Equal(1, genericBuffer.GetValue()); // After first buffering period is past
dateTime += bufferingPeriod;
Assert.Equal(2, genericBuffer.GetValue()); // After second buffering period is past
}
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 void Returns_the_same_object_while_in_the_same_buffering_period()
{
DateTime dateTime = DateTime.MinValue;
var bufferingPeriod = TimeSpan.FromTicks(1);
var genericBuffer = new GenericBuffer <object>(factory: () => new object(), bufferingPeriod: bufferingPeriod, clock: () => dateTime);
object firstValue = genericBuffer.GetValue();
Assert.Same(firstValue, genericBuffer.GetValue());
Assert.Same(firstValue, genericBuffer.GetValue());
dateTime += bufferingPeriod;
Assert.NotSame(firstValue, genericBuffer.GetValue());
Assert.Same(genericBuffer.GetValue(), genericBuffer.GetValue());
}
public static async Task Main(string[] args)
{
int i = 0;
var genericBuffer = new GenericBuffer <int>(
factory: () =>
{
Console.WriteLine("Generating new value...");
return(i++);
},
bufferingPeriod: TimeSpan.FromMilliseconds(200));
while (true)
{
Console.WriteLine($"Value: {genericBuffer.GetValue()}");
await Task.Delay(TimeSpan.FromMilliseconds(50));
}
// OUTPUT:
//Generating new value...
//Value: 0
//Value: 0
//Value: 0
//Value: 0
//Generating new value...
//Value: 1
//Value: 1
//Value: 1
//Value: 1
//Generating new value...
//Value: 2
//Value: 2
//Value: 2
//Value: 2
//Generating new value...
//Value: 3
//Value: 3
//Value: 3
//Value: 3
}