Tomcat4 Valve执行顺序

Tomcat4 Valve执行顺序

3. Valve源代码执行步骤:
    3.1  ContainerBase 的invoke()
1
public void invoke(Request request, Response response)
2
        throws IOException, ServletException {
3
        pipeline.invoke(request, response);
4
    }
3.2 DefaultPipeLine的invoke()
1
public void invoke(Request request, Response response)
2
        throws IOException, ServletException {
3
 
4
        // Invoke the first Valve in this pipeline for this request
5
        (new StandardPipelineValveContext()).invokeNext(request, response);
6
 
7
    }
3.3StandardPipelineValveContext为DefaultPipeLine的内部类.invokeNext()
view sourceprint?
01
protected class StandardPipelineValveContext
02
        implements ValveContext {
03
 
04
        // ------------------------------------------------- Instance Variables
05
        protected int stage = 0;
06
 
07
        // --------------------------------------------------------- Properties
08
        /**
09
          * Return descriptive information about this ValveContext
10
          * implementation.
11
          */
12
        public String getInfo() {
13
            return info;
14
        }
15
 
16
        // ----------------------------------------------------- Public Methods     
17
        public void invokeNext(Request request, Response response)
18
            throws IOException, ServletException {
19
 
20
            int subscript = stage;
21
            stage = stage + 1;
22
 
23
            // Invoke the requested Valve for the current request thread
24
            if (subscript < valves.length) {
25
                valves[subscript].invoke(request, response, this);
26
            } else if ((subscript == valves.length) && (basic != null)) {
27
                basic.invoke(request, response, this);
28
            } else {
29
                throw new ServletException
30
                    (sm.getString("standardPipeline.noValve"));
31
            }
32
        }
33
    }
4.Valve调用顺序：basicValve先执行，先add的后执行