Re: [logback-user] Problems with jaino evaluator

22 Jun 2012


      On Wed, Jun 20, 2012 at 1:34 PM, George, Kenneth V [NTK] <
Kenneth.V.George@sprint.com> wrote:
...
Good afternoon.
I have a situation where I need to log information to 2 separate files,
but under different conditions, for the same context/class files.
Basically, I have 2 files: 1 log, 1 alarm_log.
I need to set the level for reporting to INFO, but only log WARN/ERROR
messages to alarm_log when a MDC value of “SEND_ALARM” is set.  I have
tried to place a <filter> of type
“ch.qos.logback.core.filter.EvaluatorFilter” and cannot seem to get it to
work, messages of Level INFO show-up in the alarm_log.
Can this even be done (maybe I am just using it wrong)?  Here is the
section of my logback.xml file specifying the appender:
<appender name="ALARM"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<filter class="ch.qos.logback.core.filter.EvaluatorFilter">
<evaluator>
<expression>
if (mdc == null || mdc.get("SEND_ALARM") == null)
No need to check for (mdc == null) because it's guaranteed to not be null
in versions 0.9.30 and later.
...
return false;
return true;
</expression>
</evaluator>
</filter>
<file>logs/alarms.log</file>
<rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!-- daily rollover -->
<fileNamePattern>logs/archive/logFile.%d{yyyy-MM-dd}.log</fileNamePattern>
<!-- keep 30 days' worth of history -->
<maxHistory>30</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%date{MMM dd, yyyy hh:mm:ss} %-5level %msg%n</pattern>
</encoder>
</appender>
Try this:

<appender name="ALARM"
class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.core.filter.JaninoEvaluatorFilter">

            <evaluator>
                <expression>return (mdc.get("SEND_ALARM") != null) &&
(level > INFO);</expression>
            </evaluator>
            <OnMismatch>DENY</OnMismatch>
            <OnMatch>ACCEPT</OnMatch>
        </filter>
        <file>logs/alarms.log</file>
        <rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- daily rollover -->

<fileNamePattern>logs/archive/logFile.%d{yyyy-MM-dd}.log</fileNamePattern>

            <!-- keep 30 days' worth of history -->
            <maxHistory>30</maxHistory>
        </rollingPolicy>

        <encoder>
            <pattern>%date{MMM dd, yyyy hh:mm:ss} %-5level %msg%n</pattern>
        </encoder>
    </appender>

Re: [logback-user] Problems with jaino evaluator

Tony Trinh