public FibonacciItem GetFibonacciNumberInternal(int ordinal)
{
if (ordinal < 0)
{
Debug.WriteLine("Error:" + "Throwing OUtOfRangeException");
throw new ArgumentOutOfRangeException("ordinal", "Cannot calculate Fibonacci number for a negative number");
}
//if (m_FibonacciCache != null && m_FibonacciCache[ordinal] != null)
//{
// return m_FibonacciCache[ordinal];
//}
FibonacciItem result = null;
int previous = 0;
int next = 1;
for (int i = 0; i < ordinal; i++)
{
var delayTask = Task.Delay(100);
delayTask.Wait();
int sum = next + previous;
previous = next;
next = sum;
}
result = new FibonacciItem(next, DateTime.Now);
//if (m_FibonacciCache != null && m_FibonacciCache[ordinal] == null)
//{
// m_FibonacciCache[ordinal] = result;
//}
return(result);
}
/// <summary>
/// Accessor to FibonacciItem references
/// </summary>
/// <param name="ordinal"></param>
/// <returns>FibonacciItem if it is still alive</returns>
public FibonacciItem this[int ordinal]
{
get
{
if (!_cache.ContainsKey(ordinal))
{
return(null);
}
if (_cache[ordinal].IsAlive)
{
// Object was obtained with the weak reference.
FibonacciItem cachedItem = _cache[ordinal].Target as FibonacciItem;
return(cachedItem);
}
else
{
// Object reference is already disposed of
return(null);
}
}
set { _cache[ordinal] = new WeakReference(value); }
}
