目 錄 [ - ]

1. Interceptor結(jié)構(gòu)
2. Interceptor執(zhí)行分析
3. 源碼解析

Java代碼  

1. /** 
2.  * @throws ConfigurationException If no result can be found with the returned code 
3.  */  
4. public String invoke() throws Exception {  
5.     String profileKey = "invoke: ";  
6.     try {  
7.         UtilTimerStack.push(profileKey);  
8.               
9.         if (executed) {  
10.             throw new IllegalStateException("Action has already executed");  
11.         }  
12.         // 依次調(diào)用攔截器堆棧中的攔截器代碼執(zhí)行  
13.         if (interceptors.hasNext()) {  
14.             final InterceptorMapping interceptor = (InterceptorMapping) interceptors.next();  
15.             UtilTimerStack.profile("interceptor: "+interceptor.getName(),   
16.                     new UtilTimerStack.ProfilingBlock<String>() {  
17.                         public String doProfiling() throws Exception {  
18.                          // 將ActionInvocation作為參數(shù)，調(diào)用interceptor中的intercept方法執(zhí)行  
19.                             resultCode = interceptor.getInterceptor().intercept(DefaultActionInvocation.this);  
20.                             return null;  
21.                         }  
22.             });  
23.         } else {  
24.             resultCode = invokeActionOnly();  
25.         }  
26.   
27.         // this is needed because the result will be executed, then control will return to the Interceptor, which will  
28.         // return above and flow through again  
29.         if (!executed) {  
30.             // 執(zhí)行PreResultListener  
31.             if (preResultListeners != null) {  
32.                 for (Iterator iterator = preResultListeners.iterator();  
33.                     iterator.hasNext();) {  
34.                     PreResultListener listener = (PreResultListener) iterator.next();  
35.                           
36.                     String _profileKey="preResultListener: ";  
37.                     try {  
38.                             UtilTimerStack.push(_profileKey);  
39.                             listener.beforeResult(this, resultCode);  
40.                     }  
41.                     finally {  
42.                             UtilTimerStack.pop(_profileKey);  
43.                     }  
44.                 }  
45.             }  
46.   
47.             // now execute the result, if we're supposed to  
48.             // action與interceptor執(zhí)行完畢，執(zhí)行Result  
49.             if (proxy.getExecuteResult()) {  
50.                 executeResult();  
51.             }  
52.   
53.             executed = true;  
54.         }  
55.   
56.         return resultCode;  
57.     }  
58.     finally {  
59.         UtilTimerStack.pop(profileKey);  
60.     }  
61. }  

Java代碼  

1. resultCode = interceptor.getInterceptor().intercept(DefaultActionInvocation.this);  

Java代碼  

1. public String intercept(ActionInvocation invocation) throws Exception {  
2.     String result = null;  
3.   
4.         before(invocation);  
5.         // 調(diào)用invocation的invoke()方法，在這里形成了遞歸調(diào)用  
6.         result = invocation.invoke();  
7.         after(invocation, result);  
8.   
9.         return result;  
10. }