AOP 学习

AOP学习

一直以来对AOP的了解都是限制在理论层面，没有从实现的角度去做。在网上也看了许多列子，最后借鉴结合现有情况揉合所用

---

核心源码

---

方法属性部分

   /// <summary>    /// 日志特性    /// </summary>    [AttributeUsage(AttributeTargets.Method,AllowMultiple =true,Inherited =true)]    public class LogAttribute:Attribute    {        public string FunctionCode { get; set; }        public ExecuteTime Sort { get; set; }        public int Order { get; set; }    }    /// <summary>    /// 权限特性    /// </summary>    [AttributeUsage(AttributeTargets.Method, AllowMultiple = true, Inherited = true)]    public class PermissionsAttribute : Attribute    {        public string FunctionCode { get; set; }        public ExecuteTime Sort { get; set; }        public int Order { get; set; }    }    /// <summary>    /// 性能统计特性    /// </summary>    [AttributeUsage(AttributeTargets.Method, AllowMultiple = true, Inherited = true)]    public class PerformanceAttribute : Attribute    {        public ExecuteTime Sort { get; set; }        public int Order { get; set; }    }    public enum ExecuteTime    {        BeforeRun,        AfterRun    }public class AttributeInfo    {        public int Order { get; set; }        public ExecuteTime Time { get; set; }        public string AttributeName { get; set; }        public IList<System.Reflection.CustomAttributeNamedArgument> Datas { get; set; }    }

---

Remote代理部分

/// <summary>    /// 类 属性    /// </summary>    [AttributeUsage(AttributeTargets.Class,AllowMultiple =true,Inherited =true)]    public class AspectAttribute : ProxyAttribute    {        public override MarshalByRefObject CreateInstance(Type targetType)        {            AspectProxy realProxy = new AspectProxy(targetType);            return realProxy.GetTransparentProxy() as MarshalByRefObject;        }    }public class AspectProxy : RealProxy    {        public AspectProxy(Type targetType)            : base(targetType) { }        public override IMessage Invoke(IMessage msg)        {            if (msg is IConstructionCallMessage)            {                IConstructionCallMessage constructCallMsg = msg as IConstructionCallMessage;                IConstructionReturnMessage constructionReturnMessage = InitializeServerObject((IConstructionCallMessage)msg);                RealProxy.SetStubData(this, constructionReturnMessage.ReturnValue);                return constructionReturnMessage;            }            else            {                IMethodCallMessage callMsg = msg as IMethodCallMessage;                IMessage message;                var attributes = callMsg.MethodBase.GetCustomAttributes(true);                var datas = callMsg.MethodBase.GetCustomAttributesData();                List<AttributeInof> list = new List<AttributeInof>();                foreach(Attribute attribute in attributes)                {                    var data=datas.FirstOrDefault(x => x.AttributeType==attribute.GetType());                    if (data == null) continue;                    if(!data.NamedArguments.Any(x=>x.MemberName== "Order")|| !data.NamedArguments.Any(x => x.MemberName == "Sort"))                    {                        continue;                    }                    int Order = Convert.ToInt32(data.NamedArguments.FirstOrDefault(x => x.MemberName == "Order").TypedValue.Value);                    ExecuteTime time = (ExecuteTime)Enum.ToObject(typeof(ExecuteTime), Convert.ToInt32(data.NamedArguments.FirstOrDefault(x => x.MemberName == "Sort").TypedValue.Value));                    AttributeInof info = new AttributeInof();                    info.Order = Order;                    info.Time = time;                    info.AttributeName = attribute.GetType().Name;                    info.Datas = data.NamedArguments;                    list.Add(info);                }                try                {                    //执行前                    BeforeRun(list, callMsg.Args);                    object[] args = callMsg.Args;                    object o = callMsg.MethodBase.Invoke(GetUnwrappedServer(), args);                    //执行后                    AfterRun(list, callMsg.Args);                    list.Clear();                    list = null;                    message = new ReturnMessage(o, args, args.Length, callMsg.LogicalCallContext, callMsg);                }                catch (Exception e)                {                    message = new ReturnMessage(e, callMsg);                }                return message;            }        }        private void BeforeRun(List<AttributeInof> list, object[] args)        {            var attributes = list.Where(x => x.Time == ExecuteTime.BeforeRun).OrderBy(x => x.Order);            if (attributes == null || attributes.Count() == 0)            {                return;            }            foreach(var attribute in attributes)            {                Dictionary<string, object> dict = new Dictionary<string, object>();                foreach(var data in attribute.Datas)                {                    dict[data.MemberName] = data.TypedValue.Value;                }                Run(attribute.AttributeName, dict);                dict.Clear();                dict = null;            }        }        private void AfterRun(List<AttributeInof> list, object[] args)        {            var attributes = list.Where(x => x.Time == ExecuteTime.AfterRun).OrderBy(x => x.Order);            if (attributes == null || attributes.Count() == 0)            {                return;            }            foreach (var attribute in attributes)            {                Dictionary<string, object> dict = new Dictionary<string, object>();                foreach (var data in attribute.Datas)                {                    dict[data.MemberName] = data.TypedValue.Value;                }                Run(attribute.AttributeName, dict);                dict.Clear();                dict = null;            }        }        void Run(string attributeName,Dictionary<string,object> dict)        {            //此处可做成插件 根据配置的插件反射执行            if (attributeName == "LogAttribute")            {                Log.Logs(dict);            }            else if (attributeName == "PermissionsAttribute")            {                Permission.Logs(dict);            }            else if (attributeName == "PerformanceAttribute")            {                Performance.Logs(dict);            }        }    }

---

处理部分

    public class Log    {        public static void Logs(Dictionary<string,object> dict)        {            Console.WriteLine("日志记录");        }    }    public class Permission    {        public static void Logs(Dictionary<string, object> dict)        {            Console.WriteLine("权限");        }    }    public class Performance    {        public static void Logs(Dictionary<string, object> dict)        {            Console.WriteLine("性能统计");        }    }

Demo

---

[Aspect]    public class SimpleDemo : ContextBoundObject    {        [Log(FunctionCode ="Hello",Sort =ExecuteTime.BeforeRun,Order =0)]        [Permissions(FunctionCode = "Hello",Sort =ExecuteTime.BeforeRun,Order =1)]        [Performance(Sort =ExecuteTime.AfterRun,Order =0)]        public string Hello()        {            return "Hello World";        }    }    public class ChildDemo : SimpleDemo    {        [Performance(Sort = ExecuteTime.AfterRun, Order = 0)]        public void Say()        {            Console.WriteLine("我是 child");        }    }

---

测试

static void Main(string[] args)        {            SimpleDemo simple = new SimpleDemo();            simple.Hello();            ChildDemo child = new ChildDemo();            child.Hello();            child.Say();            Console.Read();        }