public void GetMultiplexedBatch_SlowAsyncValueFactory_InvokesMinimum()
{
var taskMultiplexer = new TaskMultiplexer <int, string>();
int valueFactoryInvocationCount = 0;
Func <ICollection <int>, Task <IDictionary <int, string> > > valueFactory = async keys =>
{
await Task.Delay(5000).ConfigureAwait(false);
Interlocked.Increment(ref valueFactoryInvocationCount);
var values = keys
.Distinct()
.ToDictionary(k => k, k => k.ToString());
return(values);
};
int threadIndex = -1;
ThreadHelpers.InvokeThreads(10, () =>
{
// *[0,5], *[1,6], *[2,7], *[3,8], *[4,9], [0,5], [1,6], [2,7], [3,8], [4,9]
var key1 = Interlocked.Increment(ref threadIndex) % 5;
var key2 = key1 + 5;
var keys = new[] { key1, key2 };
taskMultiplexer.GetMultiplexed(keys, valueFactory).Wait();
});
Assert.AreEqual(5, valueFactoryInvocationCount);
}
public void GetMultiplexed_SlowSyncValueFactory_InvokesOnce()
{
var taskMultiplexer = new TaskMultiplexer <int, string>();
int valueFactoryInvocationCount = 0;
Func <int, Task <string> > valueFactory = x =>
{
Thread.Sleep(5000);
Interlocked.Increment(ref valueFactoryInvocationCount);
return(Task.FromResult(x.ToString()));
};
ThreadHelpers.InvokeThreads(10, () => taskMultiplexer.GetMultiplexed(1, valueFactory).Wait());
Assert.AreEqual(1, valueFactoryInvocationCount);
}
public void GetMultiplexed_SlowAsyncValueFactory_InvokesOnce()
{
var taskMultiplexer = new TaskMultiplexer <int, string>();
int valueFactoryInvocationCount = 0;
Func <int, Task <string> > valueFactory = async x =>
{
await Task.Delay(5000).ConfigureAwait(false);
Interlocked.Increment(ref valueFactoryInvocationCount);
return(x.ToString());
};
ThreadHelpers.InvokeThreads(10, () => taskMultiplexer.GetMultiplexed(1, valueFactory).Wait());
Assert.AreEqual(1, valueFactoryInvocationCount);
}