设计模式 之 职责链

标签：c#   设计模式   

请假条件：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Chain_of_Responsibility
{
    class Program
    {
        //学生接口
        public interface IStudent{
            //获得学生请假级别：级别0:3小时内（纪委直接处理），级别1:超过3小时（由老师处理）
            int getLevel();
            //获得学生请假消息
            string getRequestMessage();
        }
        //学生实现类
        public class Student :IStudent {
            //请假级别
            private int level=-1;
            //请假消息
            private string message;

            public Student(int level, String message)
            {
                this.level = level;
                this.message=message;
            }

            public int getLevel()
            {
                return this.level;
            }

            public string getRequestMessage(){
                return this.message;
            }
        }
        //抽象处理者接口
        public interface IHandler
        {
            //处理请求
            void handleRequest(IStudent student);

            //设置下一个处理着
            void setHandler(IHandler handler);

        }
        //抽象处理者
        public abstract class AbstractHandler : IHandler
        {
            //下一个处理者
            private IHandler handler;

            //请假级别
            private int level = -1;

            //设置级别
            public AbstractHandler(int level)
            {
                this.level = level;
            }
            //处理请求，交由子类负责进行具体的处理
            public abstract void process(IStudent student);

            public void handleRequest(IStudent student)
            {
                if (student != null)
                {
                    if (this.level == student.getLevel())
                    {
                        //如果请假级别和当前级别一致，则当前对象进行处理
                        this.process(student);
                    }
                    else
                    {
                        if (this.handler != null)
                        {
                            Console.WriteLine(student.getRequestMessage() + " 请求米老师处理！");
                            //如果当前对象处理不了，则交给下一个处理者进行处理
                            this.handler.handleRequest(student);
                        }
                    }
                }
            }
            //设置下一个处理者
            public void setHandler(IHandler handler)
            {
                this.handler = handler;
            }
        }

        //纪委
        public class DisciplineHandler : AbstractHandler
        {
            public DisciplineHandler():base(0){}

            public override  void process(IStudent student)
            {
                Console.WriteLine("纪委 批复：" + student.getRequestMessage ());
            }
          
        }
        //老师
        public class TeacherHandler : AbstractHandler
        {
            public TeacherHandler() : base(1) { }

            public override  void process(IStudent student)
            {
                Console.WriteLine("老师 批复：" + student.getRequestMessage());
            }
        }

        //设置职责链关联
        public class ProcessHandler
        {
            private IHandler disciplineHandler;
            private IHandler teacherHandler;

            //单例模式
            private static ProcessHandler processHandler = new ProcessHandler();

            private ProcessHandler()
            {
                this.disciplineHandler = new DisciplineHandler();
                this.teacherHandler = new TeacherHandler();

                this.disciplineHandler.setHandler(this.teacherHandler);
            }

            public static ProcessHandler getInstance()
            {
                return processHandler;
            }

            //发送请假请求
            public void sendMessage(IStudent student)
            {
                this.disciplineHandler.handleRequest(student);
            }
        }

        static void Main(string[] args)
        {
            ProcessHandler processHandler = ProcessHandler.getInstance();

            IStudent student0 = new Student(0, "学生张XX快递到了，要请假20分钟！");
            IStudent student1 = new Student(1, "学生李XX运动时摔伤了腿，要请假一周！");
            Console.WriteLine("************************************************************");
            processHandler.sendMessage(student0);
            Console.WriteLine("************************************************************");
            processHandler.sendMessage(student1);
            Console.WriteLine("************************************************************");
        }
    }
}

设计模式 之 职责链

标签：c#   设计模式   

原文地址：http://blog.csdn.net/ry513705618/article/details/39458899