public async Task NonBlockingGetValueWorkWithAsyncFactory()
{
var lazy = new AsyncLazy.Lazy <int>(async() => { await Task.Delay(10); return(42); });
var value = await lazy.GetValueAsync();
value.Should().Be(42);
}
public async Task NonBlockingGetValueWorkWithNormalFactory()
{
var lazy = new AsyncLazy.Lazy <int>(() => 42);
var value = await lazy.GetValueAsync();
value.Should().Be(42);
}
public void IsValueCreatedIsTrueAfterFactoryIsCalled()
{
var lazy = new AsyncLazy.Lazy <int>(() => 42);
lazy.IsValueCreated.Should().BeFalse();
var value = lazy.Value; // calls the factory
lazy.IsValueCreated.Should().BeTrue();
}
public void FactoryIsOnlyCalledOnce()
{
int callCount = 0;
var lazy = new AsyncLazy.Lazy <int>(() =>
{
callCount++;
return(42);
});
callCount.Should().Be(0);
lazy.Value.Should().Be(42);
callCount.Should().Be(1);
lazy.Value.Should().Be(42);
callCount.Should().Be(1);
}
public async Task FactoryOnlyCalledOnceInMultiTaskContext()
{
int counter = 0;
var lazy = new AsyncLazy.Lazy <int>(() => ++ counter);
List <Task> tasks = new List <Task>();
for (int i = 0; i < 10; i++)
{
tasks.Add(Task.Run(async() =>
{
await Task.Delay(10);
return((await lazy.GetValueAsync()).Should().Be(1));
}));
}
await Task.WhenAll(tasks);
}
public void FactoryOnlyCalledOnceInMultitreadedContext()
{
int counter = 0;
var lazy = new AsyncLazy.Lazy <int>(() => ++ counter);
List <Thread> threads = new List <Thread>();
for (int i = 0; i < 10; i++)
{
threads.Add(new Thread(() =>
{
Thread.Sleep(10);
lazy.Value.Should().Be(1);
}));
}
threads.ForEach(thread => thread.Start());
threads.ForEach(thread => thread.Join());
counter.Should().Be(1);
}
