Re: [logback-user] Limiting events to one thread in email

1 Mar 2011

      Hello Benoit,

If AsyncAppender is programmaed correctly it should preserve the 
original thread name. This is usually accomplished by calling the 
prepareForDeferredProcessing method of ILoggingEvent.

Once you have the thread name all you need to do is to write the 
disciminator. Here is an example implementaiton for 
ThreadBasedDiscriminator:

public class ThreadBasedDiscriminator extends ContextAwareBase 
implements  Discriminator<ILoggingEvent> {

   String key = "threadName";
   private boolean started = false;

   // this is where the "action" is
   public String getDiscriminatingValue(ILoggingEvent event) {
     return event.getThreadName();
   }

    public String getKey() {
      return key;
    }

    public void setKey(String k) { key = k; }

    public boolean isStarted() { return started; }
    public void start() {  started = true; }
    public void stop() { started = false; }
}

HTH,
--
Ceki

On 28.02.2011 23:35, Benoit Xhenseval wrote:
...
Thanks Ceki,
I had a look at this and I'm not too sure if it is the best approach or
actually feasible... Allow me to give a few more details.
1) We're using the AsyncAppender as per
http://jira.qos.ch/browse/LBCORE-92
(by the way, it would be great to include this in an official release!)
2) The processing can happen from a JMS Message or an RMI call, or a GUI
event... there is no real single entry point where I would be able to
put a value in MDC...
Would a Cyclic Buffer per thread name in each event be a more
appropriate approach? What do you think?
I'm not sure we could use Thread.currentThread().getName()
to distinguish each caller as the AsyncAppender would be using their own
thread and not the one that actually originated the event... In which
case, the interface get() on the CyclicBuffer is not suitable since I
would have no way to give it the name of the thread that called the Error...
Your opinion/suggestion/solution are appreciated,
Thanks
Benoit
-----
Have a look at
http://logback.qos.ch/recipes/emailPerTransaction.html
HTH,
--
Ceki
On 17.02.2011 15:49, Benoit Xhenseval wrote:
...
/  Hi *,
/>/
/>/  We're running an application on large multi-threaded servers.  When an
/>/  exception/error occurs, we send an email with the last 50 DEBUG entries
/>/  or so.
/>/
/>/  How could we ensure that these 50 entries are limited to the Thread that
/>/  is actually sending the error email?
/>/
/>/  If there is no such implementation, what would be the recommended way?
/>/
/>/  We can probably contribute it back to the community
/>/
/>/  Many thanks
/>/
/>/  Benoit
/>
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Re: [logback-user] Limiting events to one thread in email

Ceki Gulcu