public void GetRecentMessagesReturnsTheLastNMessages()
{
var cache = new RecentMessageCache(10);
// Prime the cache
cache.Add("room", new List<MessageViewModel>());
for (int i = 0; i < 100; i++)
{
cache.Add(MakeMessage("dfowler", "room", "Hello_" + i));
}
var messages = cache.GetRecentMessages("room").ToList();
Assert.Equal(10, messages.Count);
// The impl of the message store allocates bucket sizes optimized for the GC so it's not exact
for (int i = 90, j = 0; i <= 99; i++, j++)
{
Assert.Equal("Hello_" + i, messages[j].Content);
}
}
public void ThreadSafety()
{
var cache = new RecentMessageCache(10);
var initial = new List<MessageViewModel>();
var wh = new ManualResetEventSlim();
for (int i = 0; i < 5; i++)
{
initial.Add(new MessageViewModel(MakeMessage("dfowler", "room", "Hello_" + i)));
}
Task.Run(() =>
{
Thread.Sleep(100);
for (int i = 0; i < 5; i++)
{
cache.Add(MakeMessage("john", "room", "john_" + i));
}
wh.Set();
});
cache.Add("room", initial);
wh.Wait();
var messages = cache.GetRecentMessages("room").ToList();
Assert.Equal(10, messages.Count);
Assert.Equal("john_0", messages[5].Content);
Assert.Equal("john_1", messages[6].Content);
Assert.Equal("john_2", messages[7].Content);
Assert.Equal("john_3", messages[8].Content);
Assert.Equal("john_4", messages[9].Content);
}