When you are sure that the underlying framework is logback, you can cast an org.slf4j.Logger instance into ch.qos.logback.classic.Logger. The latter has a method to retrieve an appender by name [1]. I hope this helps, [1] http://logback.qos.ch/apidocs/ch/qos/logback/classic/Logger.html#getAppender... On 23/07/2010 10:29 AM, lgonggr wrote:

Hi,

I used log4j before and I triggered my RollingFileAppender rollover() manually in some places (batches). I need to create seperate logfiles for each batch run. I want it to rollover using the FixedWindowRollingPolicy if the logfile exceeds 10MB and at the start of each batch run. I've migrated to logback now and it works well, but I can't figure out how to rollover my RollingFileAppender manually.

What I have now : <appender name="EntityToCSV" class="ch.qos.logback.core.rolling.RollingFileAppender"> <File>/home/tomcat/overname_test_logs/EntityToCSV.log</File> <encoder> <pattern>%d{yyyy-MM-dd HH:mm:ss} %-5p [%t] %c{1}: %m%n</pattern> </encoder> <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy"> <maxIndex>9</maxIndex>

<FileNamePattern>/home/tomcat/overname_test_logs/EntityToCSV.log.%i</FileNamePattern> </rollingPolicy> <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"> <MaxFileSize>10MB</MaxFileSize> </triggeringPolicy> </appender>

<logger name="nl.realworks.apps.overname.EntityToCSV" level="INFO"> <appender-ref ref="EntityToCSV"/> </logger>

in EntityToCSV.java :

private static final Logger LOGGER = LoggerFactory.getLogger(EntityToCSV.class);

public static void main(String[] args) throws Exception {

OvernameUtils.manualRollover(LOGGER);

// do stuff and log it

in OvernameUtils.java :

public static void manualRollover(Logger logger) { Utils.assertNotNull("logger is null.", logger); if (logger instanceof RollingFileAppender) { //<--- FAIL ! try { ((RollingFileAppender)logger).rollover(); } catch (Exception e) { logger.error("rollover failed.", e); } return; } String message = logger.getName() + " is not an instance of RollingFileAppender."; logger.error(message, new RuntimeException(message)); }

This won't work of course as Logger != Appender. I have no idea how to get from the Logger to its Appender(s). In log4j you could just do getAppender() but this is not possible with org.slf4j.Logger

Perhaps this is a totally wrong approach. Any tips would be greatly appreciated.