/// <inheritdoc />
public void Dispose()
{
lock (Keys)
{
Doorman doorman = Keys[this.key];
--doorman.RefCount;
if (doorman.RefCount == 0)
{
Keys.Remove(this.key);
doorman.Reset();
DoormanPool.Return(doorman);
}
doorman.Semaphore.Release();
}
}
/// <summary>
/// Returns a <see cref="SemaphoreSlim"/> matching on the given key
/// or a new one if none is found.
/// </summary>
/// <param name="key">The key identifying the semaphore.</param>
/// <returns>
/// The <see cref="SemaphoreSlim"/>.
/// </returns>
private static SemaphoreSlim GetOrCreate(string key)
{
Doorman item;
lock (Keys)
{
if (Keys.TryGetValue(key, out item))
{
++item.RefCount;
}
else
{
item = DoormanPool.Rent();
Keys[key] = item;
}
}
return(item.Semaphore);
}