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c#网络通信框架networkcomms内核解析之九 自定义处理方法的运行机制

c#内核方法框架 处理 解析 自定义 网络通信
2023-09-27 14:23:17 时间

本文基于networkcomms2.3.1开源版本  gplv3协议

我们自己写的处理方法都称之为自定义处理方法

比如，我们在服务器上写的与登陆相关的处理方法：

NetworkComms.AppendGlobalIncomingPacketHandler<LoginContract>("ReqLogin", IncomingLoginRequest);
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   private void IncomingLoginRequest(PacketHeader header, Connection connection, LoginContract loginContract)        {            try            {                string resMsg="";                //为了简单，这里不调用数据库，而是模拟一下登录                if (loginContract.UserID == "1000" && loginContract.PassWord == "123")                    resMsg = "登录成功";                else                    resMsg = "用户名密码错误";                //把返回结果写入到契约类中，后面返回给客户端                ResMsgContract contract = new ResMsgContract();                contract.Message = resMsg;                 connection.SendObject("ResLogin", contract);            }            catch (Exception ex)            {                           }        }
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通过以上的写法，当服务器器收到消息类型为“ReqLogin"的消息时，会自动获取到相关的处理方法。

我们看一下背后的运行机制。

首先看注册语句：

NetworkComms.AppendGlobalIncomingPacketHandler<LoginContract>("ReqLogin", IncomingLoginRequest);
AppendGlobalIncomingPacketHandler（）方法，把消息类型”ReqLogin"和处理方法“INcomingLoginRequest"添加到NetworkComms静态类的字典中：在AppendGlobalIncomingPacketHander<T>方法中 ，我们的处理方法 IncomingLoginRequest 与 PacketHandlerCallBackDelegate<T>参数相对应。来看一下PacketHandlerCallBackDelegate的定义
      public delegate void PacketHandlerCallBackDelegate<T>(PacketHeader packetHeader, Connection connection, T incomingObject);

 

AppendGlobalIncomingPacketHandler（）方法如下：
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    public static void AppendGlobalIncomingPacketHandler<T>(string packetTypeStr, PacketHandlerCallBackDelegate<T> packetHandlerDelgatePointer)        {            if (packetTypeStr == null) throw new ArgumentNullException("packetTypeStr", "Provided packetType string cannot be null.");            if (packetHandlerDelgatePointer == null) throw new ArgumentNullException("packetHandlerDelgatePointer", "Provided PacketHandlerCallBackDelegate<T> cannot be null.");            if (sendReceiveOptions == null) throw new ArgumentNullException("sendReceiveOptions", "Provided SendReceiveOptions cannot be null.");            lock (globalDictAndDelegateLocker)            {                if (globalIncomingPacketUnwrappers.ContainsKey(packetTypeStr))                {                    //Make sure if we already have an existing entry that it matches with the provided                    if (!globalIncomingPacketUnwrappers[packetTypeStr].Options.OptionsCompatible(sendReceiveOptions))                        throw new PacketHandlerException("The proivded SendReceiveOptions are not compatible with existing SendReceiveOptions already specified for this packetTypeStr.");                }                else                    globalIncomingPacketUnwrappers.Add(packetTypeStr, new PacketTypeUnwrapper(packetTypeStr, sendReceiveOptions));                                //Ad the handler to the list                if (globalIncomingPacketHandlers.ContainsKey(packetTypeStr))                {                    //Make sure we avoid duplicates                    PacketTypeHandlerDelegateWrapper<T> toCompareDelegate = new PacketTypeHandlerDelegateWrapper<T>(packetHandlerDelgatePointer);                    bool delegateAlreadyExists = false;                    foreach (var handler in globalIncomingPacketHandlers[packetTypeStr])                    {                        if (handler == toCompareDelegate)                        {                            delegateAlreadyExists = true;                            break;                        }                    }                                                            if (delegateAlreadyExists)                        throw new PacketHandlerException("This specific packet handler delegate already exists for the provided packetTypeStr.");                    //把处理方法添加到相关字典中                    globalIncomingPacketHandlers[packetTypeStr].Add(new PacketTypeHandlerDelegateWrapper<T>(packetHandlerDelgatePointer));                }                else                    globalIncomingPacketHandlers.Add(packetTypeStr, new List<IPacketTypeHandlerDelegateWrapper>() { new PacketTypeHandlerDelegateWrapper<T>(packetHandlerDelgatePointer) });                if (LoggingEnabled) logger.Info("Added incoming packetHandler for '" + packetTypeStr + "' packetType.");            }        }
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字典：

        static Dictionary<string, List<IPacketTypeHandlerDelegateWrapper>> globalIncomingPacketHandlers = new Dictionary<string, List<IPacketTypeHandlerDelegateWrapper>>();

 

我们看到上面有一句：

 PacketTypeHandlerDelegateWrapper<T> toCompareDelegate = new PacketTypeHandlerDelegateWrapper<T>(packetHandlerDelgatePointer);

看一下PacketTypeHandlerDelegateWrapper类，此类把处理方法作为参数。

我们看一下此类：

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class PacketTypeHandlerDelegateWrapper<T> : IPacketTypeHandlerDelegateWrapper    {        NetworkComms.PacketHandlerCallBackDelegate<T> innerDelegate;        public PacketTypeHandlerDelegateWrapper(NetworkComms.PacketHandlerCallBackDelegate<T> packetHandlerDelegate)        {            this.innerDelegate = packetHandlerDelegate;        }        public object DeSerialize(MemoryStream incomingBytes, SendReceiveOptions options)        {            if (incomingBytes == null) return null;            //if (incomingBytes == null || incomingBytes.Length == 0) return null;            else            //{                //if (options.DataSerializer == null)                //    throw new ArgumentNullException("options", "The provided options.DataSerializer was null. Cannot continue with deserialise.");                return options.DataSerializer.DeserialiseDataObject<T>(incomingBytes, options.DataProcessors, options.Options);            //}        }        public void Process(PacketHeader packetHeader, Connection connection, object obj)        {            innerDelegate(packetHeader, connection, (obj == null ? default(T) : (T)obj));        }        public bool Equals(IPacketTypeHandlerDelegateWrapper other)        {            if (innerDelegate == (other as PacketTypeHandlerDelegateWrapper<T>).innerDelegate)                return true;            else                return false;        }        public bool EqualsDelegate(Delegate other)        {            return other as NetworkComms.PacketHandlerCallBackDelegate<T> == innerDelegate;        }    }
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