[logback-user] Problems with jaino evaluator

20 Jun 2012

      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)
                        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>

Thanks.

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[logback-user] Problems with jaino evaluator

George, Kenneth V [NTK]