Thank you for your detailed response! I considered using GEventEvaluator but in my experience Groovy has added more of a memory/performance overhead than I'm willing to take on. The syntax is undoubtedly more concise, but I'm not using expressions that are more than 1 or 2 lines, so for me Janino will work just fine. Thanks again. Eric On Tue, Jan 11, 2011 at 9:36 AM, Ceki Gulcu <ceki@qos.ch> wrote:
Hi Eric,
I think commons-compiler is needed for Janino 2.6 and later. Logback was tested with Janino 2.4.x and 2.5.x.
If you have a need for java-expressions, try GEventEvaluator even if you are not familiar with the Groovy language. Contrary to JaninoEventEvaluator which understands simple expressions, GEventEvaluator can parse blocks of code. As an example, with using Janino you would write:
!logger.startsWith("org.apache.http") || ( logger.equals("org.apache.http.wire") && (mdc != null && mdc.get("entity") != null && ((String) mdc.get("entity")).contains("someSpecialValue")) && !message.contains("someSecret") )
In Groovy, this would become:
if(logger.startsWith("org.apache.http")) return true;
if(mdc?.get("entity") == null) return false;
String payee = (String) mdc.get("entity");
if(logger.equals("org.apache.http.wire") && payee.contains("someSpecialValue") && !message.contains("someSecret")) { return true; }
return false;
Note the Groovy expression is almost valid Java. My point is that for most non-trivial expressions the Groovy version will be easier to write and to read.
Note that while Groovy has advantages over Java as language, the biggest difference between JaninoEventEvaluator and GEventEvaluator is due to the former's limitation to boolean expressions. This limitations is likely to be removed in a future version of logback.
HTH, -- Ceki
On 11.01.2011 17:12, Eric Hough wrote:
Hi,
I'm using Janino with logback to utilize evaluators after installing Janino as described at http://logback.qos.ch/setup.html. It's working great.
However I noticed that over on Janino's site (http://docs.codehaus.org/display/JANINO/Download#Download-installation) they require commons-compiler.jar. My question is, does Logback also require commons-compiler.jar? I just want to make sure I don't run into a ClassNotFoundException down the road.
Thanks!
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