java实现责任链模式的小demo
2021/6/22 14:26:48
本文主要是介绍java实现责任链模式的小demo,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
//一个请假请求 public class LeaveRequest { private int leaveDays; private String name; public void leave(){ System.out.println("走完了流程都没人处理我"); } //省略getter、setter }
//一个请假的处理接口,具体的处理类都要实现这个接口 @FunctionalInterface public interface LeaveHandler { // 直属主管审批处理的请假天数 int MIN = 3; // 部门经理需要处理的请假天数 int MIDDLE = 10; // 总经理审批 int MAX = 30; void handRequest(LeaveRequest leaveRequest, FilterChain filterChain); }
//直属主管处理类 public class SupervisorHandler implements LeaveHandler{ @Override public void handRequest(LeaveRequest leaveRequest, FilterChain filterChain) { if (leaveRequest.getLeaveDays() < MIN){ System.out.println("请假天数" + leaveRequest.getLeaveDays() + "我是直属主管,我处理了"); return; } System.out.println("主管处理不了,下一个"); filterChain.doFilter(); } } //部门经理处理类 public class DeptManagerHandler implements LeaveHandler{ @Override public void handRequest(LeaveRequest leaveRequest, FilterChain filterChain) { if (leaveRequest.getLeaveDays() <= MIDDLE){ System.out.println("请假天数" + leaveRequest.getLeaveDays() + "我是部门经理,我处理了"); return; } System.out.println("经理处理不了,下一个"); filterChain.doFilter(); } } //总经理处理类 public class GeneralManagerHandler implements LeaveHandler{ @Override public void handRequest(LeaveRequest leaveRequest, FilterChain filterChain) { if (leaveRequest.getLeaveDays() <= MAX){ System.out.println("请假天数" + leaveRequest.getLeaveDays() + "我是总经理,我处理了"); return; } System.out.println("总经理处理不了,下一个"); filterChain.doFilter(); } }
//过滤器链,把各个处理类串联起来 public class FilterChain { private int index = 0; private LeaveRequest leaveRequest; private List<LeaveHandler> leaveHandlerList = new ArrayList<LeaveHandler>(); public FilterChain(LeaveRequest leaveRequest){ this.leaveRequest = leaveRequest; } public FilterChain addHandler(LeaveHandler leaveHandler){ if (null == leaveHandler) return null; this.leaveHandlerList.add(leaveHandler); return this; } public void doFilter(){ if(index == leaveHandlerList.size()) { leaveRequest.leave(); return; } leaveHandlerList.get(index++).handRequest(leaveRequest,this); } }
public class Main { public static void main(String[] args){ LeaveRequest leaveRequest = new LeaveRequest(49,"小明"); FilterChain filterChain = new FilterChain(leaveRequest); filterChain.addHandler(new SupervisorHandler()) .addHandler(new DeptManagerHandler()) .addHandler(new GeneralManagerHandler()) //使用lambda表达式创建自定义处理类 .addHandler((LeaveRequest request, FilterChain filter) -> { if (request.getLeaveDays() <= 50){ System.out.println("请假天数" + request.getLeaveDays() + "我是自定义处理器,我处理了"); return; } System.out.println("自定义处理不了,下一个"); filter.doFilter(); }) .doFilter(); } }
输出: 主管处理不了,下一个 经理处理不了,下一个 总经理处理不了,下一个 请假天数49我是自定义处理器,我处理了
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