[logback-dev] [JIRA] (LOGBACK-1016) logback-access: Enable MDC support

[Erik Lund Jensen (JIRA)]

Title: Message Title

Erik Lund Jensen commented on LOGBACK-1016   Re: logback-access: Enable MDC support The MDC is not available when writing the access log. The MDC variables are removed by the filter (post-processing) running way before the access log.It is not a solution just to not remove the MDC variables, as you wouldn't want the MDC variables to stay around for the next request. In stead you may write a few classes for handling this.First, write a class for holding your variables. For example: public class AccessLogger {     private static ThreadLocal<AdditionalInfo> currentInfo = new ThreadLocal<>();     public static String getAndRemoveAdditionalInfo() {         AdditionalInfo additionalInfo = currentInfo.get();         currentInfo.remove();         return additionalInfo.getInfo();     }     public static void setAdditionalInfo(String info){         currentInfo.set(new AdditionalInfo(info));     }     public static final class AdditionalInfo {         private String info;         public AdditionalInfo(String info) {             super();             this.info = info;         }         public String getInfo() {             return info;         }     } } Secondly, use that class in a custom access converter: public class AdditionalInfoConverter extends AccessConverter  {     @Override     public String convert(IAccessEvent event) {         String info = AccessLogger.getAndRemoveAdditionalInfo();         return info!=null ? info : "-";     } } Thirdly, add the customer converter to a new wrapper class. This class adds %X to get the additional info.It would be nice if Logback supported a callback to extend PatterLayout, however, this is how it can be done without changing the Logback source code. public class AccessLogLayoutWrapper extends PatternLayoutEncoderBase<IAccessEvent> {     @Override     public void start() {      PatternLayout patternLayout = new PatternLayout();      patternLayout.getDefaultConverterMap().put("X", AdditionalInfoConverter.class.getName());         patternLayout.setContext(context);         patternLayout.setPattern(getPattern());         patternLayout.start();         this.layout = patternLayout;         super.start();     } } Finally, use some filter to set the additional info in AccessLogger. ... AccessLogger.setAdditionalInfo( userName); Add Comment   This message was sent by Atlassian JIRA (v6.4.12#64027-sha1:e3691cc)

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