public Task <T> Get()
{
if (CurrentState == CacheState.Active ||
CurrentState == CacheState.Reloading)
{
var result = Task.FromResult(Volatile.Read(ref _value));
if (_stopWatchThreadSafe.Elapsed() > _expiresAfterFq)
{
this.ChangeState(CacheEvent.Expire);
}
return(result);
}
else
{
var task = new TaskCompletionSource <T>();
lock (_lock)
{
_pendingTasks.Add(task);
}
// Need to do this check since we can't do an atomic add.
if (CurrentState == CacheState.Active)
{
task.TrySetResult(_value);
}
this.ChangeState(CacheEvent.Load);
return(task.Task);
}
}
public void SimpleTest()
{
var watch = new StopWatchThreadSafe();
Thread.Sleep(5);
Assert.AreEqual(StopWatchThreadSafe.MillsToFrequency(5), watch.Elapsed(), 500000);
}
private bool EligibleForRemoval(long timeIdle)
{
return(LastUsed.Elapsed() > timeIdle);
}