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">

            

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



            

            <maxHistory>30</maxHistory>

        </rollingPolicy>

        <encoder>

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

        </encoder>

    </appender>

Try this:

<expression>return (mdc.get("SEND_ALARM") != null) && (level > INFO);</expression>

</evaluator>

<OnMatch>ACCEPT</OnMatch>

</filter>

<file>logs/alarms.log</file>

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

</rollingPolicy>

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

</encoder>

</appender>