Exemple #1
0
        public override void SetAndReleaseItemExclusive(HttpContext context, string id, SessionStateStoreData item, object lockId, bool newItem)
        {
            // 1 remote call
            #region Access Log
#if TRACE
            {
                Handler.LogHandler.Tracking("Access Method: " + this.GetType().ToString() + "->" + ((object)MethodBase.GetCurrentMethod()).ToString() + " ;");
            }
#endif
            #endregion Access Log

            // creating a new StoreDataInfo will initialize LockDate to null (unlocked)
            SessionStoreDataContext data = new SessionStoreDataContext(item);
            Cache.Add(GetCacheKey(id), (object)SessionStoreDataContext.Serialize(data), DateTime.Now.AddMinutes(item.Timeout));
        }
Exemple #2
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        public override void CreateUninitializedItem(HttpContext context, string id, int timeout)
        {
            // 1 remote call
            #region Access Log
#if TRACE
            {
                Handler.LogHandler.Tracking("Access Method: " + this.GetType().ToString() + "->" + ((object)MethodBase.GetCurrentMethod()).ToString() + " ;");
            }
#endif
            #endregion Access Log

            _timeout = timeout;
            SessionStoreDataContext data = new SessionStoreDataContext(CreateNewStoreData(context, timeout));
            Cache.Add(GetCacheKey(id), (object)SessionStoreDataContext.Serialize(data), DateTime.Now.AddMinutes(data.Data.Timeout));
        }
        /// <summary>
        /// Deserializes binary data into a fully hydrated SessionStoreDataContext.
        /// </summary>
        /// <param name="bytes">serialized binary data</param>
        /// <returns>The object representation of the session data</returns>
        /// <exception cref="HttpException">Thrown if deserialization encounters a problem</exception>
        internal static SessionStoreDataContext Deserialize(byte[] bytes, HttpContext context)
        {
            try
            {
                using (MemoryStream stream = new MemoryStream(bytes))
                {
                    using (BinaryReader reader = new BinaryReader(stream))
                    {
                        //See comments in Serialize method for description of fields
                        int      timeout          = reader.ReadInt32();
                        bool     hasItems         = reader.ReadBoolean();
                        bool     hasStaticObjects = reader.ReadBoolean();
                        bool     isLocked         = reader.ReadBoolean();
                        DateTime?lockDate         = null;
                        if (isLocked)
                        {
                            lockDate = DateTime.FromBinary(reader.ReadInt64());
                        }

                        SessionStateItemCollection items = hasItems
                            ? SessionStateItemCollection.Deserialize(reader)
                            : new SessionStateItemCollection();
                        HttpStaticObjectsCollection staticObjects = hasStaticObjects
                            ? HttpStaticObjectsCollection.Deserialize(reader)
                            : SessionStateUtility.GetSessionStaticObjects(context);

                        //this is a sanity byte.  If it does not equal 0xFF, there is a problem
                        if (reader.ReadByte() != 0xff)
                        {
                            throw new HttpException("Invalid Session State");
                        }

                        SessionStoreDataContext data = new SessionStoreDataContext(new SessionStateStoreData(items, staticObjects, timeout));
                        data.LockDate = lockDate;
                        return(data);
                    }
                }
            }
            catch (EndOfStreamException)
            {
                throw new HttpException("Invalid Session State");
            }
        }
Exemple #4
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        public override void ReleaseItemExclusive(HttpContext context, string id, object lockId)
        {
            // 1-2 remote calls
            #region Access Log
#if TRACE
            {
                Handler.LogHandler.Tracking("Access Method: " + this.GetType().ToString() + "->" + ((object)MethodBase.GetCurrentMethod()).ToString() + " ;");
            }
#endif
            #endregion Access Log

            //todo: replace with single unlock call when available
            byte[] bytes = Cache.Get <byte[]>(GetCacheKey(id));
            if (bytes != null)
            {
                SessionStoreDataContext data = SessionStoreDataContext.Deserialize(bytes, context);
                data.ClearLock();
                Cache.Add(GetCacheKey(id), (object)SessionStoreDataContext.Serialize(data), DateTime.Now.AddMinutes(data.Data.Timeout));
            }
        }
        /// <summary>
        /// Serializes a SessionStoreDataContext into binary data.
        /// </summary>
        /// <param name="info">The object to serialize</param>
        /// <returns>Binary data that can later be deserialized into a fully
        /// hydrated SessionStoreDataContext</returns>
        internal static byte[] Serialize(SessionStoreDataContext info)
        {
            using (MemoryStream stream = new MemoryStream())
            {
                using (BinaryWriter writer = new BinaryWriter(stream))
                {
                    bool hasItems         = info.Data.Items != null && info.Data.Items.Count > 0;
                    bool hasStaticObjects = info.Data.StaticObjects != null && !info.Data.StaticObjects.NeverAccessed;
                    bool isLocked         = info.IsLocked;

                    //Serialize timeout information
                    writer.Write(info.Data.Timeout);
                    //Serialize whether to bother reading SessionStateItemCollection data
                    writer.Write(hasItems);
                    //Serialize whether to bother reading HttpStaticObjectCollection data
                    writer.Write(hasStaticObjects);
                    //Serialize whether to bother reading a lock date
                    writer.Write(isLocked);
                    if (isLocked)
                    {
                        //Serialize numeric representation of DateTime object
                        writer.Write(info.LockDate.Value.ToBinary());
                    }
                    if (hasItems)
                    {
                        //Defer to the item collection class for serialization of collection
                        ((SessionStateItemCollection)info.Data.Items).Serialize(writer);
                    }
                    if (hasStaticObjects)
                    {
                        //Defer to the static object collection class for serialization of collection
                        info.Data.StaticObjects.Serialize(writer);
                    }
                    //Trailing byte helpful for sanity checks during deserialization
                    writer.Write((byte)0xff);
                }
                return(stream.GetBuffer());
            }
        }
Exemple #6
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        private SessionStateStoreData FetchCachedStoreData(HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actions, bool exclusive)
        {
            // 1-2 remote calls
            locked  = false;
            lockAge = TimeSpan.Zero;
            lockId  = null;
            actions = SessionStateActions.None;

            // check for existing session
            byte[] bytes = Cache.Get <byte[]>(GetCacheKey(id));
            if (bytes == null)
            {
                return(null);
            }

            SessionStoreDataContext data = SessionStoreDataContext.Deserialize(bytes, context);

            locked = data.IsLocked;
            if (locked)
            {
                lockAge = DateTime.Now.Subtract(data.LockDate.Value);
                lockId  = data.LockDate;
                // specs require null to be returned
                return(null);
            }

            //todo: rewrite with real locking when available
            // as of a few microseconds ago, this session was unlocked, so proceed
            if (exclusive)
            {
                data.LockDate = DateTime.Now;
                // not perfectly thread safe as there can be race conditions between
                // clustered servers, but this is the best we've got
                Cache.Add(GetCacheKey(id), (object)SessionStoreDataContext.Serialize(data), DateTime.Now.AddMinutes(data.Data.Timeout));
            }

            return(data.Data);
        }