SingleThreadModel means that only one thread is allowed to run in your
servlet at a time. So what is happening is with your first call to the
servlet a thread starts to execute in the servlet - but it never leaves the
servlet, as per yopur code. It thereby blocks the second call which will
start a new thread that will try to run through the servlet but due to the
fact the thread from the first call is still running in the servlet the
second call's thread is blocked due to the restrictions of the
SingleThreadModel.
So if anything the W2K implementation seems like it might be incorrect, but
I suspect that it is setup differently, perhaps with a very short timeout.
Cheers
Adrian
> -----Original Message-----
> From: Patricio Vera S. [SMTP:[EMAIL PROTECTED]]
> Sent: 09 December 2002 11:16
> To: [EMAIL PROTECTED]
> Subject: Fw: servlet implementing SingleThreadModel
>
> Hello,
>
> I tried to understand the implementation of SingleThreadModel on
> Jakarta-Tomcat servlet engine.
>
> The idea is run one instance of the servlet with the "opcion"
> parameter
> = SS so the servlet run in a cycle for ever and then call in a new window
> the same servlet with the "opcion" parameter != SS, so I get the next
> results :
>
> 1. In my tomcat 3.2.1 over Linux implementation I get timeout on the
> second call of the servlet, even I configured tomcat with thread pool (i
> attach part of the server.xml).
>
> 2. In my tomcat 4.1 over W2K implementation I get the correct answer
> on
> the second call of the servlet.
>
> So the question is :
>
> a. Is there any problem with the tomcat 3.2.1 version over Linux and
> threads?
> b. How I can configure tomcat 3.2.1 for thread safe?
>
> I appreciate any help or idea... thanks in advance.
>
>
> > serThread Code :
> >
> > import javax.servlet.*;
> > import javax.servlet.http.*;
> > import java.io.*;
> > import java.util.*;
> >
> > public class serThread extends HttpServlet implements SingleThreadModel
> {
> >
> > //Initialize global variables
> > public void init(ServletConfig config) throws ServletException {
> > super.init(config);
> > }
> >
> > //Process the HTTP Get request
> > public void doGet(HttpServletRequest request, HttpServletResponse
> > response) throws ServletException, IOException {
> > //
> > String sOpcion = "";
> > try {
> > sOpcion = request.getParameter("opcion");
> > } catch (Exception e) {
> > e.printStackTrace();
> > sOpcion = "No Option";
> > }
> > response.setContentType("text/html");
> > PrintWriter out = new PrintWriter (response.getOutputStream());
> >
> > if (sOpcion == null || sOpcion.equals("") )
> > sOpcion = "No Option";
> >
> > if (sOpcion.equals("SS")) {
> > while ( true )
> > ;
> > }
> > out.println("<html>");
> > out.println("<head><title>serThread</title></head>");
> > out.println("<body>");
> > out.println("<h1>Hello!!</h1>");
> > out.println("<h2>Opcion : " + sOpcion + "</h2>");
> > out.println("</body></html>");
> > out.close();
> > }
> >
> > //Get Servlet information
> > public String getServletInfo() {
> > return "serProcard.serThread Information";
> > }
> > }
> >
> > server.xml :
> >
> > <Connector
> className="org.apache.tomcat.service.PoolTcpConnector">
> > <Parameter
> > name="handler"
> >
> > value="org.apache.tomcat.service.connector.Ajp13ConnectionHandler"/>
> > <Parameter
> > name="port"
> > value="8041"/>
> > <Parameter
> > name="max_threads"
> > value="30"/>
> > <Parameter
> > name="max_spare_threads"
> > value="20"/>
> > <Parameter
> > name="min_spare_threads"
> > value="5"/>
> > </Connector>
> >
> > Saludos,
> > Patricio Vera S.
> >
>
> _______________________________________________________________
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> El único lugar de Internet con vídeos de los 64 partidos.
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