public object GetData(string key)
{
ValidateKey(key);
CacheItem cacheItemBeforeLock = null;
bool lockWasSuccessful = false;
do
{
lock (inMemoryCache.SyncRoot)
{
cacheItemBeforeLock = (CacheItem)inMemoryCache[key];
if (IsObjectInCache(cacheItemBeforeLock))
{
CachingServiceItemReadEvent.Fire(false);
return(null);
}
lockWasSuccessful = Monitor.TryEnter(cacheItemBeforeLock);
}
if (lockWasSuccessful == false)
{
Thread.Sleep(0);
}
} while (lockWasSuccessful == false);
try
{
if (cacheItemBeforeLock.HasExpired())
{
cacheItemBeforeLock.TouchedByUserAction(true);
backingStore.Remove(key); // Does exception safety matter here? We're removing it due to expiration or scavenging...
inMemoryCache.Remove(key);
RefreshActionInvoker.InvokeRefreshAction(cacheItemBeforeLock, CacheItemRemovedReason.Expired);
CachingServiceItemReadEvent.Fire(false);
CachingServiceItemTurnoverEvent.FireRemoveItems(1);
CachingServiceItemTurnoverEvent.SetItemsTotal(inMemoryCache.Count);
return(null);
}
backingStore.UpdateLastAccessedTime(cacheItemBeforeLock.Key, DateTime.Now); // Does exception safety matter here?
cacheItemBeforeLock.TouchedByUserAction(false);
CachingServiceItemReadEvent.Fire(true);
return(cacheItemBeforeLock.Value);
}
finally
{
Monitor.Exit(cacheItemBeforeLock);
}
}
private void FireCacheMissCounter()
{
CachingServiceItemReadEvent.Fire(false);
}
private void FireCacheHitCounter()
{
CachingServiceItemReadEvent.Fire(true);
}
