protected override void PurgeCache(object sender, System.Timers.ElapsedEventArgs e)
{
ReaderWriterLock readWriteLock = new ReaderWriterLock();
System.Threading.Thread.CurrentThread.Priority = ThreadPriority.BelowNormal; // This process is not critical as according to add or update.
if (!Monitor.TryEnter(isPurging))
{
return;
}
try
{
readWriteLock.AcquireWriterLock(MAX_LOCK_WAIT);
try
{
List <object> expiredCacheObjects = new List <object>();
foreach (TimedCacheKey loopExpiredCacheObject in timedStorage.Keys)
{
if (loopExpiredCacheObject.ExpirationDate < e.SignalTime)
{
expiredCacheObjects.Add(loopExpiredCacheObject);
}
else
{
break;
}
}
foreach (object key in expiredCacheObjects)
{
TimedCacheKey timedCacheKey = timedStorageIndex[key];
timedStorageIndex.Remove(timedCacheKey.Key);
timedStorage.Remove(timedCacheKey);
}
}
finally
{
readWriteLock.ReleaseWriterLock();
}
}
finally
{
Monitor.Exit(isPurging);
}
}
protected override bool Add(object key, object value, TimeSpan slidingExpirationTime)
{
if (timedStorageIndex.ContainsKey(key))
{
return(false);
}
else
{
TimedCacheKey cacheKey = new TimedCacheKey(key, slidingExpirationTime);
timedStorage.Add(cacheKey, value);
timedStorageIndex.Add(key, cacheKey);
return(true);
}
}
protected override object GetTimed(object key)
{
if (timedStorageIndex.ContainsKey(key))
{
Object cacheVal;
TimedCacheKey cacheKey = timedStorageIndex[key];
cacheVal = timedStorage[cacheKey];
timedStorage.Remove(cacheKey);
cacheKey.Accessed();
timedStorage.Add(cacheKey, cacheVal);
return(cacheVal);
}
else
{
return(null);
}
}
protected override bool Update(object key, object value, DateTime expirationDate)
{
if (untimedStorage.ContainsKey(key))
{
untimedStorage.Remove(key);
}
else if (timedStorageIndex.ContainsKey(key))
{
timedStorage.Remove(timedStorageIndex[key]);
timedStorageIndex.Remove(key);
}
else
{
return(false);
}
TimedCacheKey cacheKey = new TimedCacheKey(key, expirationDate);
timedStorage.Add(cacheKey, value);
timedStorageIndex.Add(key, cacheKey);
return(true);
}