On May 31, 2010, at 3:53 PM, Curt Arnold wrote:
>
> On May 31, 2010, at 3:28 PM, Thorbjørn Ravn Andersen wrote:
>
>> Den 30/05/10 23.12, Curt Arnold skrev:
>>> I don't have this in code or in the JIRA, but I have mentioned in recent
>>> threads the idea of a user-supplied context object in logging calls.
>>> Currently log4j has a thread associated context (the MDC and NDC) and there
>>> are JVM level context (line ending separator), but there is no concept of a
>>> user-supplied context unless embedded in the message parameter.
>>> In this case, the logging call is operating in the "context" of the servlet
>>> request, and you could do pass the servlet as the user-context object. A
>>> servlet appender could check if the user context object was a Servlet and
>>> if so delegate to its log method. We could also add patterns for %ipaddr,
>>> %ipport, etc, that would attempt to recognize the user-context object and
>>> extract that info if it could recognize the type.
>>>
>> I am unsure of what you describe. Could you write some pseudocode showing
>> what you mean?
>>
>
> I'm working way below the client API at the moment, but the general idea is
> that in addition to MDC and NDC (aka the thread-associated context), the
> stack trace (aka the caller context), you can provide context with an
> explicit context parameter on the logging call.
>
> If the current logj4 API was extended to add user-supplied context, you'd
> have:
>
> Logger.info(Object message, Throwable thrown, Object context);
I would object to this - see my other post. I could tolerate this if it was
Logger.into(Object message, Throwable thrown, Context context);
But since the Context is likely to have the same life expectancy as the
LoggerContext it makes more sense to just tie those together.
public class LoggerContextListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent event) {
LogManager.setContext(new
ServletLoggerContext(event.getServletContext()));
}
}
public class ServletLoggerContext extends LoggerContext {
private ServletContext context;
public ServletLoggerContext(ServletContext context) {
super();
this.context = context;
}
public Object getExternalContext() {
return this.context;
}
}
Ralph
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