log4j-script/src/test/resources/log4j-rolling-with-custom-delete-script.xml

<?xml version="1.0" encoding="UTF-8"?>
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<Configuration status="WARN" name="RollingWithCustomDeleteScriptTest">
  <Properties>
    <Property name="base">target/rolling-with-delete-script/</Property>
  </Properties>

  <Appenders>
    <RollingFile name="RollingFile" fileName="${base}/rollingtest.log"
                   filePattern="${base}/test/test-%i.log">
      <PatternLayout>
        <Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
      </PatternLayout>
      <Policies>
        <SizeBasedTriggeringPolicy size="50" />
      </Policies>
      <DefaultRolloverStrategy max="100" stopCustomActionsOnError="true">
        <Delete basePath="${base}/test" maxDepth="1" followLinks="false">
          <ScriptCondition>
            <Script name="GroovyCondition" language="groovy"><![CDATA[
                import java.nio.file.*;

                def pattern = ~/test-(\d*)\.log/;
                assert pattern.getClass() == java.util.regex.Pattern;

                def copy = pathList.collect{it};
                pathList.each { pathWithAttributes ->
                  def relative = basePath.relativize pathWithAttributes.path
                  def str = relative.toString();
                  statusLogger.trace 'SCRIPT: relative path is ' + str + " (base=$basePath)";

                  // keep only files with odd indexes

                  def m = pattern.matcher(str);
                  if (m.find()) {
                    def index = m.group(1) as int;
                    def isOdd = (index % 2) == 1;
                    if (isOdd) {
                      copy.remove pathWithAttributes; // remove path with odd index from list to delete
                      statusLogger.trace 'SCRIPT: not deleting path ' + pathWithAttributes;
                    }
                  }
                }
                statusLogger.trace 'SCRIPT: returning ' + copy;
                copy;
              ]]>
            </Script>
          </ScriptCondition>
        </Delete>
      </DefaultRolloverStrategy>
    </RollingFile>
  </Appenders>

  <Loggers>
    <Root level="trace">
      <AppenderRef ref="RollingFile" />
    </Root>
  </Loggers>

</Configuration>