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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