src/site-docs/adoc/fragments/howto-logging/rolling-file-appenders.adoc

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// ============LICENSE_START=======================================================
//  Copyright (C) 2016-2018 Ericsson. All rights reserved.
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// @author Sven van der Meer (sven.van.der.meer@ericsson.com)
//

== Rolling File Appenders

Rolling file appenders are a good option for more complex logging of a production or complex testing APEX installation.
The standard logback configuration can be used for these use cases.
This section gives two examples for the standard logging and for context logging.

First the standard logging.
The following example defines a rolling file appender.
The appender rolls over on a daily basis.
It allows for a file size of 100 MB.

[source%nowrap,xml]
----
<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
  <file>${VAR_LOG}/apex.log</file>
  <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
    <!-- rollover daily -->
    <!-- <fileNamePattern>xstream-%d{yyyy-MM-dd}.%i.txt</fileNamePattern> -->
    <fileNamePattern>${VAR_LOG}/apex_%d{yyyy-MM-dd}.%i.log.gz
    </fileNamePattern>
    <maxHistory>4</maxHistory>
    <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
      <!-- or whenever the file size reaches 100MB -->
      <maxFileSize>100MB</maxFileSize>
    </timeBasedFileNamingAndTriggeringPolicy>
  </rollingPolicy>
  <encoder>
    <pattern>
      %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %ex{full} %n
    </pattern>
  </encoder>
</appender>
----

A very similar configuration can be used for a rolling file appender logging APEX context.

[source%nowrap,xml]
----
<appender name="CTXT-FILE"
      class="ch.qos.logback.core.rolling.RollingFileAppender">
  <file>${VAR_LOG}/apex_ctxt.log</file>
  <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
    <fileNamePattern>${VAR_LOG}/apex_ctxt_%d{yyyy-MM-dd}.%i.log.gz
    </fileNamePattern>
    <maxHistory>4</maxHistory>
    <timeBasedFileNamingAndTriggeringPolicy
        class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
      <maxFileSize>100MB</maxFileSize>
    </timeBasedFileNamingAndTriggeringPolicy>
  </rollingPolicy>
  <encoder>
    <pattern>
      %d %-5relative [procId=${processId}] [%thread] %-5level %logger{26} - %msg %ex{full} %n
    </pattern>
  </encoder>
</appender>
----