<div dir="ltr">One more question: will that sequenceNumber be handled only on the context of the initial Thread? For example: if two logging instances were running at the same time, will each of them handle its own sequentials? Any explanation on the underlying mechanics would be appreciated.<div>
<br></div><div style>Thanks again in advance.</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jul 2, 2013 at 6:40 PM, Felipe <span dir="ltr"><<a href="mailto:felipenaranja@gmail.com" target="_blank">felipenaranja@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">So many answers in so little time. Thank you very much!</div><div class="gmail_extra"><div><div class="h5">
<br><br><div class="gmail_quote">On Tue, Jul 2, 2013 at 6:20 PM, ceki <span dir="ltr"><<a href="mailto:ceki@qos.ch" target="_blank">ceki@qos.ch</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Indeed, Integer.MAX_VALUE is 2^31. On a recent PC, an application doing nothing but logging, can log around 100'000 messages per second. The sequence number of such an application will reach 2^31 after about two hours of continuous logging (or approx. 200 GB of logs).<br>
<br>
As David mentioned atomic long is probably a better alternative.<br>
<br>
import java.util.concurrent.atomic.<u></u>AtomicLong;<br>
import ch.qos.logback.classic.spi.<u></u>ILoggingEvent;<br>
import ch.qos.logback.classic.<u></u>pattern.ClassicConverter<br>
<br>
public class LocalSequenceNumberConverter extends ClassicConverter {<br>
<br>
AtomicLong sequenceNumber = new AtomicLong(0);<div><br>
<br>
@Override<br>
public String convert(ILoggingEvent event) {<br></div>
return Long.toString(sequenceNumber.<u></u>getAndIncrement());<br>
}<br>
}<br>
<br>
A volatile long is not guaranteed to work properly because incrementing a long is not atomic whereas incrementing a int is.<div><br>
<br>
<br>
On 03.07.2013 00:01, David Roussel wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
Or use AtomicLong.<br>
<br>
David<br>
<br>
On 2 Jul 2013, at 22:50, ceki <<a href="mailto:ceki@qos.ch" target="_blank">ceki@qos.ch</a>> wrote:<br>
<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
<br>
In your custom converter, declare a sequenceNumber as follows:<br>
<br>
*volatile* int sequenceNumber = 0;<br>
<br>
increment sequenceNumber for each new event:<br>
<br>
sequenceNumber++;<br>
<br>
That's it.<br>
<br>
On 02.07.2013 23:21, Felipe wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div>
Hi everyone:<br>
<br>
I'm writing to all of you because I want to display a sequence number<br>
for each event. I've done some research regarding this and I know for<br>
sure that LogBack is not able to natively handle this as Log4j2 does<br>
with %sn, or as JUL partially does with getSequenceNumber() (I won't be<br>
changing LogBack because of this, anyway).<br>
<br>
I know for sure LogBack is lacking this functionality because of this<br>
issue on JIRA:<br>
<br>
<a href="http://jira.qos.ch/browse/LOGBACK-546" target="_blank">http://jira.qos.ch/browse/<u></u>LOGBACK-546</a><br>
<br>
That issue is a four years old boy now.<br>
<br>
I found a link on Stack Overflow<br>
(<a href="http://stackoverflow.com/questions/11162951/line-numbers-with-logback" target="_blank">http://stackoverflow.com/<u></u>questions/11162951/line-<u></u>numbers-with-logback</a>)<br>
which lead me to the following link:<br>
<br>
<a href="http://logback.qos.ch/manual/layouts.html#customConversionSpecifier" target="_blank">http://logback.qos.ch/manual/<u></u>layouts.html#<u></u>customConversionSpecifier</a><br>
<br></div>
I tried a static number but it was sred across threads so it didn't<div><br>
work that well. I also thought of ThreadLocal but I read a story which<br>
freaked me out:<br>
<br>
<a href="http://niklasschlimm.blogspot.com/2012/04/threading-stories-threadlocal-in-web.html" target="_blank">http://niklasschlimm.blogspot.<u></u>com/2012/04/threading-stories-<u></u>threadlocal-in-web.html</a><br>
<br>
Does anyone know of a good way to achieve sequentials?<br>
<br>
Best regards and thanks in advance.<br>
<br>
--<br>
Felipe<br>
<br>
<br>
</div></blockquote></blockquote></blockquote><div><div>
<br>
<br>
-- <br>
Ceki<br>
65% of statistics are made up on the spot<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div></div></div><span class="HOEnZb"><font color="#888888">-- <br>Felipe
</font></span></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br>Felipe
</div>