about user transaction time-out
by Javier Sanz
Hello,
I am trying to run an example about transactions using timeout ... and i was
surprised when i ran the code ...
Using another transaction manager, like jotm, bitronix, the time-out from a
user transaction do the following
timeout := X seconds
ut start
action 1
action 2
action 3
ut commit
if error ... ut rollback
if action1 or action 2 o action 3 are into the period of X seconds , they
will not executed ... for example ... if action 1 got a lot of time, more
than timeout, then,
action 2 and action 3 never been executed ... right ...
But, using jboss-user transaction, ... the time-out exception is throwed
when action 3 finished !!!! ... the following sample shows my problem ..
package paq;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import javax.annotation.Resource;
import javax.ejb.ApplicationException;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceUnit;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.transaction.UserTransaction;
public class Tiempo extends javax.servlet.http.HttpServlet implements
javax.servlet.Servlet {
private static final long serialVersionUID = 8150995692542819134L;
@Resource
private UserTransaction ut;
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
try {
out.write("<br>" + new Date());
ut.setTransactionTimeout(1);
ut.begin();
Thread.sleep(3000);
out.write("<br>" + new Date());
out.write("->1" + ut + "<br>");
Thread.sleep(3000);
out.write("<br>" + new Date());
out.write("->2" + ut + "<br>");
Thread.sleep(3000);
out.write("<br>" + new Date());
ut.commit();
}
catch (Exception e) {
out.write("<br>" + new Date());
out.write("<br>Excepcion:=" + e);
}
}
}
The exception from time-out is throwed after 9 seconds !!!! nooo ... i need
it al least at 2 seconds !! and never run the hole of transaction ...
why do i need to run a completed tx when the first is broken into a timeout
!!!
if my transaction has 3 operations and a timeout is 4 hours , 1.- spends
1 hour, 2.- spends 1 hours , 3.- spends 2 hours ... if i got a problem
and the first one and second need 4 hours to finish, i don't want to wait
another 2 hours to recieve the time-out exception !!!
how can i resolve it
thank you
14 years, 6 months
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