private RunningSemaphore AcquireRunningSemaphore(string cacheKey, IEnumerable <KeyValuePair <string, string> > attributes, TimeSpan maxAge)
{
RunningSemaphore semaphore = null;
var orderedAttributes = attributes.OrderBy(a => a.Key).ToArray();
lock (_runningSemaphores)
{
semaphore = _runningSemaphores.FirstOrDefault(
r => r.Key == cacheKey &&
r.MaxAge == maxAge &&
r.Attributes.OrderBy(a => a.Key).SequenceEqual(orderedAttributes)
);
if (semaphore == null)
{
semaphore = new RunningSemaphore()
{
Attributes = orderedAttributes,
Key = cacheKey,
MaxAge = maxAge,
Semaphore = new SemaphoreSlim(1)
};
_runningSemaphores.Add(semaphore);
}
}
return(semaphore);
}
private void RemoveSemaphore(RunningSemaphore runningSemaphore)
{
lock (_runningSemaphores)
{
_runningSemaphores.Remove(runningSemaphore);
}
}