/// <summary>
        ///   Handles operation RaiseGenericEvent. Sends event ItemGeneric to an Item owner or the subscribers of an Item />.
        /// </summary>
        public OperationResponse OperationRaiseGenericEvent(PeerBase peer, OperationRequest request, SendParameters sendParameters)
        {
            var operation = new RaiseGenericEvent(peer.Protocol, request);
            if (!operation.IsValid)
            {
                return new OperationResponse(request.OperationCode) { ReturnCode = (int)ReturnCode.InvalidOperationParameter, DebugMessage = operation.GetErrorMessage() };
            }

            operation.OnStart();
            Item item;
            bool actorItem = true;
            if (this.TryGetItem(operation.ItemId, out item) == false)
            {
                if (this.World.ItemCache.TryGetItem(operation.ItemId, out item) == false)
                {
                    return operation.GetOperationResponse((int)ReturnCode.ItemNotFound, "ItemNotFound");
                }

                actorItem = false;
            }

            if (actorItem)
            {
                // we are already in the item thread, invoke directly
                return ItemOperationRaiseGenericEvent(item, operation, sendParameters);
            }

            // second parameter (peer) allows us to send an error event to the client (in case of an error)
            item.Fiber.Enqueue(() => this.ExecItemOperation(() => ItemOperationRaiseGenericEvent(item, operation, sendParameters), sendParameters));

            // operation continued later
            return null;
        }
        private static OperationResponse ItemOperationRaiseGenericEvent(Item item, RaiseGenericEvent operation, SendParameters sendParameters)
        {
            if (item.Disposed)
            {
                return operation.GetOperationResponse((int)ReturnCode.ItemNotFound, "ItemNotFound");
            }

            var eventInstance = new ItemGeneric
            {
                ItemId = item.Id,
                CustomEventCode = operation.CustomEventCode,
                EventData = operation.EventData
            };

            var eventData = new EventData((byte)EventCode.ItemGeneric, eventInstance);
            sendParameters.Unreliable = (Reliability)operation.EventReliability == Reliability.Unreliable;
            sendParameters.ChannelId = Settings.ItemEventChannel;
            switch (operation.EventReceiver)
            {
                case (byte)EventReceiver.ItemOwner:
                    {
                        item.Owner.Peer.SendEvent(eventData, sendParameters);
                        break;
                    }

                case (byte)EventReceiver.ItemSubscriber:
                    {
                        var message = new ItemEventMessage(item, eventData, sendParameters);
                        item.EventChannel.Publish(message);
                        break;
                    }

                default:
                    {
                        return operation.GetOperationResponse((int)ReturnCode.ParameterOutOfRange, "Invalid EventReceiver " + operation.EventReceiver);
                    }
            }

            // no response
            operation.OnComplete();
            return null;
        }
        /// <summary>
        ///   The operation raise generic event.
        /// </summary>
        /// <param name = "item">
        ///   The mmo item.
        /// </param>
        /// <param name = "operation">
        ///   The operation.
        /// </param>
        /// <param name = "sendParameters">
        ///   The send Parameters.
        /// </param>
        /// <returns>
        ///   Ok or ItemNotFound
        /// </returns>
        private static OperationResponse ItemOperationRaiseGenericEvent(Item item, RaiseGenericEvent operation, SendParameters sendParameters)
        {
            if (item.Disposed)
            {
                return operation.GetOperationResponse((int)ReturnCode.ItemNotFound, "ItemNotFound");
            }

            var eventInstance = new ItemGeneric
                {
                   ItemId = item.Id, ItemType = item.Type, CustomEventCode = operation.CustomEventCode, EventData = operation.EventData 
                };

            var eventData = new EventData((byte)EventCode.ItemGeneric, eventInstance);
            sendParameters.Unreliable = (Reliability)operation.EventReliability == Reliability.Unreliable;
            sendParameters.ChannelId = Settings.ItemEventChannel;
            switch (operation.EventReceiver)
            {
                case (byte)EventReceiver.ItemOwner:
                    {
                        if (((IMmoItem)item).ReceiveEvent(eventData, sendParameters) == false)
                        {
                            string debugMessage = string.Format("Target item {0}/{1} could not receive event", item.Type, item.Id);
                            return operation.GetOperationResponse((int)ReturnCode.InvalidOperation, debugMessage);
                        }

                        break;
                    }

                case (byte)EventReceiver.ItemSubscriber:
                    {
                        var message = new ItemEventMessage(item, eventData, sendParameters);
                        item.EventChannel.Publish(message);
                        break;
                    }

                default:
                    {
                        return operation.GetOperationResponse((int)ReturnCode.ParameterOutOfRange, "Invalid EventReceiver " + operation.EventReceiver);
                    }
            }

            // no response
            operation.OnComplete();
            return null;
        }