System.Web.SessionState.SessionInProcHandler.GetItemInternal C# (CSharp) Method

		SessionStateStoreData GetItemInternal (HttpContext context,
						       string id,
						       out bool locked,
						       out TimeSpan lockAge,
						       out object lockId,
						       out SessionStateActions actions,
						       bool exclusive)
		{
			locked = false;
			lockAge = TimeSpan.MinValue;
			lockId = Int32.MinValue;
			actions = SessionStateActions.None;

			if (id == null)
				return null;
			
			Cache cache = HttpRuntime.InternalCache;
			string CacheId = CachePrefix + id;
			InProcSessionItem item = cache [CacheId] as InProcSessionItem;
			
			if (item == null)
				return null;

			bool readLocked = false, writeLocked = false;
			try {
				if (item.rwlock.TryEnterUpgradeableReadLock (lockAcquireTimeout))
					readLocked = true;
				else
					throw new ApplicationException ("Failed to acquire lock");
				
				if (item.locked) {
					locked = true;
					lockAge = DateTime.UtcNow.Subtract (item.lockedTime);
					lockId = item.lockId;
					return null;
				}
				
				if (exclusive) {
					if (item.rwlock.TryEnterWriteLock (lockAcquireTimeout))
						writeLocked = true;
					else
						throw new ApplicationException ("Failed to acquire lock");
					item.locked = true;
					item.lockedTime = DateTime.UtcNow;
					item.lockId++;
					lockId = item.lockId;
				}
				if (item.items == null) {
					actions = SessionStateActions.InitializeItem;
					item.items = new SessionStateItemCollection ();
				}
				if (item.staticItems == null)
					item.staticItems = staticObjects;
				
				return new SessionStateStoreData (item.items,
								  item.staticItems,
								  item.timeout);
			} catch {
				// we want such errors to be passed to the application.
				throw;
			} finally {
				if (writeLocked)
					item.rwlock.ExitWriteLock ();
				if (readLocked)
					item.rwlock.ExitUpgradeableReadLock ();
			}
		}