private object Add (string strKey,
object objItem,
CacheDependency objDependency,
DateTime absolutExpiration,
TimeSpan slidingExpiration,
CacheItemPriority enumPriority,
CacheItemRemovedCallback eventRemoveCallback,
bool pub,
bool overwrite) {
if (strKey == null)
throw new ArgumentNullException ("strKey");
if (objItem == null)
throw new ArgumentNullException ("objItem");
if (slidingExpiration > _datetimeOneYear)
throw new ArgumentOutOfRangeException ("slidingExpiration");
CacheEntry objEntry;
CacheEntry objOldEntry = null;
long longHitRange = 10000;
// todo: check decay and make up the minHit range
objEntry = new CacheEntry ( this,
strKey,
objItem,
objDependency,
eventRemoveCallback,
absolutExpiration,
slidingExpiration,
longHitRange,
pub,
enumPriority);
_lockEntries.AcquireWriterLock (-1);
try {
_nItems++;
if (_arrEntries.Contains (strKey)) {
if (overwrite)
objOldEntry = _arrEntries [strKey] as CacheEntry;
else
return null;
}
objEntry.Hit ();
_arrEntries [strKey] = objEntry;
// If we have any kind of expiration add into the CacheExpires
// Do this under the lock so no-one can retrieve the objEntry
// before it is fully initialized.
if (objEntry.HasSlidingExpiration || objEntry.HasAbsoluteExpiration) {
if (objEntry.HasSlidingExpiration)
objEntry.Expires = DateTime.UtcNow.Ticks + objEntry.SlidingExpiration;
_objExpires.Add (objEntry);
}
} finally {
_lockEntries.ReleaseLock ();
}
if (objOldEntry != null) {
if (objOldEntry.HasAbsoluteExpiration || objOldEntry.HasSlidingExpiration)
_objExpires.Remove (objOldEntry);
objOldEntry.Close (CacheItemRemovedReason.Removed);
}
return objEntry.Item;
}
