发表代码架构1 分钟读完 (大约135个字)0次访问

拦截器实现的细节

1. 拦截器细节

  1. 前置处理按拦截器列表的顺序执行；

  1. 后置处理按拦截器列表的逆序执行；

  2. 后置处理的异常需捕获后统一抛出；

2. 代码示例

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
public class InterceptorChain {
private List<IInterceptor> interceptorList = new ArrayList<>();

public void registerInterceptor(IInterceptor interceptor) {
 interceptorList.add(interceptor);
} 

public void beforeHandle(Object obj, Callable task) {
 if (CollectionUtils.isEmpty(interceptorList)) {
   return;
 }
 for (IInterceptor interceptor : interceptorList) {
   interceptor.beforeHandle(obj, task);
 }
}

public void afterHandle(Object obj, Callable task) {
 if (CollectionUtils.isEmpty(interceptorList)) {
   return;
 }  

 List<Throwable> throwableList = new ArrayList<>;
 for(int i = interceptorList.size(); i > -1; i--) {
   try {
      interceptorList.get(i).afterHandle(obj, task);
   } catch (Throwable throwable) {
       throwableList.add(throwable);
   }
 }
 ExceptionUtils.throwExceptionIfNotEmpty(throwableList);
}
}

评论

×