/// <summary>
/// Add a new keyed object to the cache.
/// </summary>
/// <param name="key">The key of the object.</param>
/// <param name="value">The object to add.</param>
/// <param name="scavengingPriority">One of the <see cref="CacheItemPriority"/> values.</param>
/// <param name="refreshAction">An <see cref="ICacheItemRefreshAction"/> object.</param>
/// <param name="expirations">An array of <see cref="ICacheItemExpiration"/> objects.</param>
public void Add(string key, object value, CacheItemPriority scavengingPriority,params ICacheItemExpiration[] expirations)
{
ValidateKey(key);
CacheItem cacheItemBeforeLock = null;
bool lockWasSuccessful = false;
do
{
lock (inMemoryCache.SyncRoot)
{
if (inMemoryCache.Contains(key) == false)
{
cacheItemBeforeLock = new CacheItem(key, addInProgressFlag, CacheItemPriority.NotRemovable, null);
inMemoryCache[key] = cacheItemBeforeLock;
}
else
{
cacheItemBeforeLock = (CacheItem)inMemoryCache[key];
}
lockWasSuccessful = Monitor.TryEnter(cacheItemBeforeLock);
}
if (lockWasSuccessful == false)
{
Thread.Sleep(0);
}
} while (lockWasSuccessful == false);
try
{
cacheItemBeforeLock.TouchedByUserAction(true);
CacheItem newCacheItem = new CacheItem(key, value, scavengingPriority, expirations);
try
{
//backingStore.Add(newCacheItem);
cacheItemBeforeLock.Replace(value, scavengingPriority, expirations);
inMemoryCache[key] = cacheItemBeforeLock;
}
catch
{
//backingStore.Remove(key);
inMemoryCache.Remove(key);
throw;
}
//instrumentationProvider.FireCacheUpdated(1, inMemoryCache.Count);
}
finally
{
Monitor.Exit(cacheItemBeforeLock);
}
}
private static bool IsObjectInCache(CacheItem cacheItemBeforeLock)
{
return cacheItemBeforeLock == null || Object.ReferenceEquals(cacheItemBeforeLock.Value, addInProgressFlag);
}
private bool RemoveItemFromCache(CacheItem itemToRemove)
{
bool expired = false;
lock (itemToRemove)
{
if (itemToRemove.WillBeExpired)
{
try
{
expired = true;
cacheOperations.RemoveItemFromCache(itemToRemove.Key, CacheItemRemovedReason.Expired);
}
catch (Exception e)
{
//instrumentationProvider.FireCacheFailed(Resources.FailureToRemoveCacheItemInBackground, e);
}
}
}
return expired;
}
