That's is the idea, block the servlet so when call with another browser
instance force to execute a new thread....
It's semms ok in tomcat 4.1 on W2K but not in tomcat 3.2.1 on linux.
Saludos,
Patricio Vera S.
----- Original Message -----
From: "Partha Ranjan Das" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, December 10, 2002 3:10 AM
Subject: Re: servlet implementing SingleThreadModel
> if (sOpcion.equals("SS")) {
> > > while ( true )
> > > ;
> > > }
> What does this code do? it will loop eternally.
>
> -----Original Message-----
> From: Adrian Janssen [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, December 10, 2002 12:27 PM
> To: [EMAIL PROTECTED]
> Subject: Re: servlet implementing SingleThreadModel
>
>
> 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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