public async Task PublishSubscribe_ShouldLimitSimultaneouslyRunningHandlersToSpecifiedValue_IfMaxConcurrentHandlersSpecified()
{
// given
var delivery = new CountdownEvent(10);
_sut = CreateCaraBus(new CaraBusBaseOptions
{
MaxDegreeOfParallelism = 5
});
_sut.Subscribe <TestMessage>(m =>
{
Thread.Sleep(TimeSpan.FromMilliseconds(800));
delivery.Signal();
}, SubscribeOptions.NonExclusive());
await _sut.StartAsync();
// when
var sw = new Stopwatch();
sw.Start();
for (var i = 0; i < 10; i++)
{
await _sut.PublishAsync(new TestMessage());
}
delivery.Wait(TimeSpan.FromSeconds(15));
sw.Stop();
var executioTime = sw.Elapsed;
// then
Assert.That(executioTime.Seconds, Is.GreaterThanOrEqualTo(1));
Assert.That(executioTime.Seconds, Is.LessThanOrEqualTo(2)); // 10 messages, 5 max parallel degree, 10/5 = 2 messages per moment, 800ms * 2 = ~1600
}
