[undertow-dev] Embedded undertow with servlet deployment and dispatch to worker threads

[Dragan Jotanovic]

You are right. Thanks.


On Fri, Apr 25, 2014 at 7:38 PM, Jason Greene <jason.greene at redhat.com>wrote:

> A worker is definitely being used. However, the behavior you are seeing is
> happening because your web browser is reusing the same connection to issue
> the second request. If you execute multiple curl commands you should see
> processing concurrently.
>
> On Apr 25, 2014, at 1:29 PM, Dragan Jotanovic <draganj at gmail.com> wrote:
>
> > Hi,
> > I did some testing with servlet deployment on undertow and it seems that
> servlet requests are always executed on IO thread instead of dispatched to
> worker threads.
> >
> > Basically I used modified servlet example from undertow github (I just
> added Thread.sleep(5000) to servlet). When I send request simultaneously
> from two browser tabs, first request is retrieved after 5 seconds as
> expected, but the second after 10 seconds, which means that IO thread was
> blocked until first request was completed.
> > Is there some configuration parameter in DeploymentInfo which forces
> request to be dispatched to worker threads, or is there some other way to
> prevent IO thread from blocking?
> >
> > Bellow is the example source:
> >
> > import javax.servlet.ServletConfig;
> > import javax.servlet.ServletException;
> > import javax.servlet.http.HttpServlet;
> > import javax.servlet.http.HttpServletRequest;
> > import javax.servlet.http.HttpServletResponse;
> >
> > import io.undertow.Handlers;
> > import io.undertow.Undertow;
> > import io.undertow.server.HttpHandler;
> > import io.undertow.server.handlers.PathHandler;
> > import io.undertow.servlet.api.DeploymentInfo;
> > import io.undertow.servlet.api.DeploymentManager;
> >
> > import java.io.IOException;
> > import java.io.PrintWriter;
> >
> > import static io.undertow.servlet.Servlets.defaultContainer;
> > import static io.undertow.servlet.Servlets.deployment;
> > import static io.undertow.servlet.Servlets.servlet;
> >
> > public class TestServer {
> >     public static class TestServlet extends HttpServlet {
> >         @Override
> >         public void init(final ServletConfig config) throws
> ServletException {
> >             super.init(config);
> >         }
> >
> >         @Override
> >         protected void doGet(final HttpServletRequest req, final
> HttpServletResponse resp) throws ServletException, IOException {
> >             try {
> >                 Thread.sleep(5000);
> >             } catch (InterruptedException e) {
> >                 e.printStackTrace();
> >             }
> >             PrintWriter writer = resp.getWriter();
> >             writer.write("Done!");
> >             writer.close();
> >         }
> >
> >         @Override
> >         protected void doPost(final HttpServletRequest req, final
> HttpServletResponse resp) throws ServletException, IOException {
> >             doGet(req, resp);
> >         }
> >     }
> >
> >     public static void main(String[] args) {
> >         try {
> >             String context = "/";
> >             DeploymentInfo servletBuilder = deployment()
> >                     .setClassLoader(TestServer.class.getClassLoader())
> >                     .setContextPath(context)
> >                     .setDeploymentName("test.war")
> >                     .addServlets(
> >                             servlet("TestServlet",
> TestServer.TestServlet.class)
> >                                     .addMapping("/*"));
> >
> >             DeploymentManager manager =
> defaultContainer().addDeployment(servletBuilder);
> >             manager.deploy();
> >
> >             HttpHandler servletHandler = manager.start();
> >             PathHandler path = Handlers.path(Handlers.redirect(context))
> >                     .addPrefixPath(context, servletHandler);
> >             Undertow server = Undertow.builder()
> >                     .addHttpListener(8181, "0.0.0.0")
> >                     .setHandler(path)
> >                     .build();
> >             server.start();
> >         } catch (ServletException e) {
> >             throw new RuntimeException(e);
> >         }
> >     }
> > }
> >
> > _______________________________________________
> > undertow-dev mailing list
> > undertow-dev at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/undertow-dev
>
> --
> Jason T. Greene
> WildFly Lead / JBoss EAP Platform Architect
> JBoss, a division of Red Hat
>
>
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