Tomcat4 Valve执行顺序

3. Valve源代码执行步骤:
    3.1  ContainerBase 的invoke()
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public void invoke(Request request, Response response)
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        throws IOException, ServletException {
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        pipeline.invoke(request, response);
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    }
3.2 DefaultPipeLine的invoke()
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public void invoke(Request request, Response response)
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        throws IOException, ServletException {
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        // Invoke the first Valve in this pipeline for this request
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        (new StandardPipelineValveContext()).invokeNext(request, response);
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    }
3.3StandardPipelineValveContext为DefaultPipeLine的内部类.invokeNext()
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protected class StandardPipelineValveContext
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        implements ValveContext {
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        // ------------------------------------------------- Instance Variables
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        protected int stage = 0;
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        // --------------------------------------------------------- Properties
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        /**
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          * Return descriptive information about this ValveContext
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          * implementation.
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          */
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        public String getInfo() {
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            return info;
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        }
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        // ----------------------------------------------------- Public Methods     
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        public void invokeNext(Request request, Response response)
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            throws IOException, ServletException {
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            int subscript = stage;
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            stage = stage + 1;
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            // Invoke the requested Valve for the current request thread
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            if (subscript < valves.length) {
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                valves[subscript].invoke(request, response, this);
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            } else if ((subscript == valves.length) && (basic != null)) {
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                basic.invoke(request, response, this);
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            } else {
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                throw new ServletException
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                    (sm.getString("standardPipeline.noValve"));
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            }
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        }
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    }
4.Valve调用顺序：basicValve先执行，先add的后执行