[jboss-user] [JBoss Seam] - Re: Using log4j's NDC

[trautmane]

For what it is worth, here is what I'm currently using with Seam 1.2.1 to add the Seam identity username to the log4j mapped diagnostic context:

 
  | @Startup
  | @Scope(ScopeType.APPLICATION)
  | @Name("some.package.loggingContextFilter")
  | @Intercept(InterceptionType.NEVER)
  | @Install
  | public class LoggingContextFilter extends AbstractFilter {
  | 
  |     /** Identifier for the username "diagnostic context". */
  |     public static final String USERNAME_CONTEXT = "username";
  | 
  |     public void doFilter(ServletRequest servletRequest,
  |                          ServletResponse servletResponse,
  |                          FilterChain filterChain)
  |             throws IOException, ServletException {
  | 
  |         if (servletRequest instanceof HttpServletRequest) {
  |             HttpServletRequest req = (HttpServletRequest) servletRequest;
  |             String path = req.getServletPath();
  |             if ((path != null) && (path.endsWith(".seam"))) {
  |                 HttpSession session = req.getSession();
  |                 Object o = session.getAttribute("org.jboss.seam.security.identity");
  |                 if (o instanceof Identity) {
  |                     Identity identity = (Identity) o;
  |                     String username = identity.getUsername();
  |                     if (username != null) {
  |                         MDC.put(USERNAME_CONTEXT, username);
  |                     }
  |                 }
  |             }
  |         }
  | 
  |         filterChain.doFilter(servletRequest, servletResponse);
  | 
  |         MDC.remove(USERNAME_CONTEXT);
  |     }
  | }
  | 

You could do something similar with the NDC if you wanted.

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