public T GetOrAdd(string key, Func <T> loadFunction)
{
LazyLock lazy;
bool success;
synclock.EnterReadLock();
try
{
success = this.TryGetValue(key, out lazy);
}
finally
{
synclock.ExitReadLock();
}
if (!success)
{
synclock.EnterWriteLock();
try
{
if (!this.TryGetValue(key, out lazy))
{
lazy = new LazyLock();
this.Add(key, lazy);
}
}
finally
{
synclock.ExitWriteLock();
}
}
return(lazy.Get(loadFunction));
}
private bool TryGetValue(string key, out LazyLock value)
{
value = this.Get(key);
if (value != null)
{
return(true);
}
return(false);
}
private void Add(string key, LazyLock item)
{
var policy = new CacheItemPolicy();
policy.Priority = CacheItemPriority.NotRemovable;
if (IsTimespanSet(cachePolicy.AbsoluteExpiration))
{
policy.AbsoluteExpiration = DateTimeOffset.Now.Add(cachePolicy.AbsoluteExpiration);
}
else if (IsTimespanSet(cachePolicy.SlidingExpiration))
{
policy.SlidingExpiration = cachePolicy.SlidingExpiration;
}
cache.Add(key, item, policy);
}