Re: [logback-user] One Log file per Log Level

17 Aug 2009

      SiftingAppender could do that pretty elegantly. However, you would need to write 
a discriminator such as:

// I have not tested (not even compiled) this code
public class LevelBasedDiscriminator extends ContextAwareBase implements
     Discriminator<LoggingEvent> {

   private boolean started = false;

   public ContextBasedDiscriminator() {
   }

   public String getDiscriminatingValue(ILoggingEvent event) {
     return event.getLevel().toString();
   }

   public boolean isStarted() {
     return started;
   }

   public void start() {
     started = true;
   }

   public void stop() {
     started = false;
   }

   public String getKey() {
     return "level";
   }

   public void setKey(String key) {
     throw new UnsupportedOperationException("Key cannot be set");
   }

   public String getDefaultValue() {
     return "DEBUG";
   }

   public void setDefaultValue(String defaultValue) {
     throw new UnsupportedOperationException("default value cannot be set.");
   }
}

Here is a sample configuration file:

<configuration>
   <appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender">
     <discriminator  class="some.package.name.LevelBasedDiscriminator"/>
     <sift>
       <appender name="FILE-${level}"
                class="ch.qos.logback.core.FileAppender">
         <File>$level}.log</File>
         <layout>
           <Pattern>%d [%thread] %level %mdc %logger{35} - %msg%n</Pattern>
         </layout>
       </appender>
     </sift>
   </appender>
   <root level="DEBUG">
     <appender-ref ref="SIFT" />
   </root>
</configuration>

If you'd like the LevelBasedDiscriminator to be added to logback please enter a 
jira issue.

HTH

James Apfel wrote:
...
Hey,
I'm wondering if it's possible to configure Logback so that it writes
individual log files for the various log levels. For example ERROR is
written to error.txt, WARN to warn.txt and so on...
Thanks,
 James
-- 
Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch

Re: [logback-user] One Log file per Log Level

Ceki Gulcu