Hello, I've created a handler to fill MDC from incoming request header. public class CorrelationHandler implements HttpHandler { private HttpHandler next; public CorrelationHandler(HttpHandler next) { this.next = next; } @Override public void handleRequest(HttpServerExchange e) throws Exception { String corr = e.getRequestHeaders().getFirst("IDP-CORR-ID"); MDC.put("corr", corr); next.handleRequest(e); } } But most of my processing is done in worker thread and mdc is not passed threre. How to pass it? _______________________________________________ undertow-dev mailing list undertow-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/undertow-dev

Thank you for your answers. I understand I need to explicitly set MDC in worker thread. Problem is I cannot modify the codebase of application that runs on Wildfly. Actually it is a war deployed into Wildfly, and I cannot re-build it. I want to customize only undertow/wildfly. The custom handler I add this way runs in IO thread: /subsystem=undertow/configuration=filter/custom-filter=correlation:add(module="com.ingrammicro.idp.undertow-correlation",class-name=com.ingrammicro.idp.CorrelationHandler) /subsystem=undertow/server=default-server/host=default-host/filter-ref=correlation:add() But from stacktrace I see multiple handlers run in worker thread: handleRequest:43, PredicateHandler (io.undertow.server.handlers) handleRequest:68, RedirectDirHandler (io.undertow.servlet.handlers) handleRequest:132, SSLInformationAssociationHandler (io.undertow.servlet.handlers.security) handleRequest:57, ServletAuthenticationCallHandler (io.undertow.servlet.handlers.security) Also, I can add an expression handler that runs in worker thread: /subsystem=undertow/configuration=filter/expression-filter=IM_private:add(,expression="path-template('/auth/realms/{realm}/restart-session') -> ip-access-control(acl={'127.0.0.1 allow', '0:0:0:0:0:0:0:1 allow'})") /subsystem=undertow/server=default-server/host=default-host/filter-ref=IM_private:add() Is it possible to add a custom handler to run in a worker thread? ср, 3 июн. 2020 г. в 10:23, Andrea Di Cesare <andrea(a)softinstigate.com&gt;: > If a thread switch occurs the MDC context is lost. > > You can attach it to the exchange: > > public static final AttachmentKey<Map<String, String>> MDC_CONTEXT_KEY = > AttachmentKey.create(Map.class); > .... > exchange.putAttachment(MDC_CONTEXT_KEY, MDC.getCopyOfContextMap()); > ... > > and then restore it in your worker thread: > > MDC.setContextMap(exchange.getAttachment(MDC_CONTEXT_KEY)); > > Hope this helps, > > Andrea Di Cesare > Partner at Soft*Instigate* <https://softinstigate.com/> > MongoDB Technology Partner > <https://sched.co/b2Hz> > Via Copernico 38, 20125 Milano (Italy) > Mobile: +39 329 737 6417 > Skype: ujibang > > The company behind *REST*Heart <https://restheart.org>;, the NoCoding > and NoSQL Platform for MongoDB > > > Il giorno mar 2 giu 2020 alle ore 14:57 Мартынов Илья < > imartynovsp(a)gmail.com&gt; ha scritto: > >> Hello, >> >> I've created a handler to fill MDC from incoming request header. >> public class CorrelationHandler implements HttpHandler >> { >> private HttpHandler next; >> public CorrelationHandler(HttpHandler next) { >> this.next = next; >> } >> @Override >> public void handleRequest(HttpServerExchange e) throws Exception { >> String corr = e.getRequestHeaders().getFirst("IDP-CORR-ID"); >> MDC.put("corr", corr); >> next.handleRequest(e); >> } >> } >> >> But most of my processing is done in worker thread and mdc is not passed >> threre. How to pass it? >> >> _______________________________________________ >> undertow-dev mailing list >> undertow-dev(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/undertow-dev > > _______________________________________________ undertow-dev mailing list undertow-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/undertow-dev