Tomcat4Valve execution sequence

3. Valve source code execution steps: invoke () 1 publicvoidinvoke (Requestrequest, Responseresponse) 2 throwsIOException, ServletException {3pipeline. invoke (request, respons... 3. Valve source code execution steps:
3.1 ContainerBase 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 invoultpipeline 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 is the internal class of DefaultPipeLine. 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 call sequence: basicValve is executed first, add is followed by execution