[logback-user] Switch logging to different files at runtime

[lee json]

Changing to use sift appender is working with content similar to below

Thanks for the advice.

<configuration>
  <appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender">
    <discriminator>
      <key>log.file</key>
      <defaultValue>unknown</defaultValue>
    </discriminator>
    <sift>
      <appender name="FILE-${log.file}"
class="ch.qos.logback.core.FileAppender">
        <file>/path/to/log/${log.file}.log</file>
        <layout class="ch.qos.logback.classic.PatternLayout">
          <pattern><!-- ... log pattern ... --></pattern>
        </layout>
      </appender>
    </sift>
  </appender>
  <root level="ALL">
    <appender-ref ref="SIFT" />
  </root>
</configuration>

On 21 May 2014 03:40, David Roussel <nabble at diroussel.xsmail.com> wrote:
> You can use sifting appender to change log file name dynamically based on values in the MDC.
>
> For instance you could have one log file per user. Or one line file per web session.
>
> David
>
>> On 20 May 2014, at 20:29, lee json <jsonlee.ft at gmail.com> wrote:
>>
>> I test to run a sample logging message to a file. But I am wondering
>> how can I switch logging to different files at runtime? For example,
>> initially the message is logged to <log_dir>/<file_a>.log. Later on I
>> would like the application to log message to <log_dir>/<file_b>.log.
>> Is it doable with logback lib?
>>
>> I want to log message to logs/<parent_key_id>/<key_id>...log. Is
>> RollingPolicy configured to start up once? How can I change logging to
>> another log file such as logs/<parent_key_id1>/<key_id1>...log when
>> certain condition is met?
>>
>> Thanks
>>
>> The current setting:
>> logback.xml
>> <?xml version="1.0" encoding="UTF-8"?>
>> <configuration scan="false" debug="false">
>>  <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
>>    <rollingPolicy class="sample.logging.MyRollingPolicy">
>>      <FileNamePattern>%keyId_%d.log.gz</FileNamePattern>
>>      <MaxHistory>60</MaxHistory>
>>    </rollingPolicy>
>>    <layout class="ch.qos.logback.classic.PatternLayout">
>>      <!-- http://logback.qos.ch/manual/layouts.html#PatternLayout -->
>>      <Pattern>[%4p] [%d{ISO8601}] [%t] %c{1}: %m%n</Pattern>
>>    </layout>
>>  </appender>
>>  <root level="INFO">
>>    <appender-ref ref="FILE"/>
>>  </root>
>> </configuration>
>>
>> MyRolling.scala
>> package sample.logging
>>
>> import java.io.File
>>
>> import ch.qos.logback.core.rolling.TimeBasedRollingPolicy;
>>
>> class MyRollingPolicy[E] extends TimeBasedRollingPolicy[E] {
>>  override def setFileNamePattern(fnp: String) {
>>    try{
>>      println("fnp passed in: "+fnp)
>>      val fnp1 = fnp.replace("%keyId", "k_1_3")
>>      println("[after replaced] fnp1 now is "+fnp1)
>>
>>      val f = new File("logs/" + "parent_key_id");
>>      // Logback will create any necessary parent paths.
>>      super.setFileNamePattern(f.getAbsolutePath() + "/" + fnp1);
>>    } catch {
>>      case e: Exception => {
>>        println("something go wrong..."+e)
>>        throw new RuntimeException(e);
>>      }
>>    }
>>  }
>> }
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