Now I'm trying this, but I'm getting a NullPointerException on the first start() LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory(); lc.reset(); //Setup Time Based File Naming and Triggering Policy SizeAndTimeBasedFNATP<ILoggingEvent> timeBasedTriggering = new SizeAndTimeBasedFNATP<ILoggingEvent>(); timeBasedTriggering.setContext(lc); timeBasedTriggering.setMaxFileSize("500MB"); //Setup Time Based Rolling Policy TimeBasedRollingPolicy<ILoggingEvent> rollingPolicy = new TimeBasedRollingPolicy<ILoggingEvent>(); rollingPolicy.setContext(lc); rollingPolicy.setFileNamePattern("bidderserver-%d{yyyy-MM-dd-HH:mm:ss}-"+hostname+"-ip.%i.log"); rollingPolicy.setTimeBasedFileNamingAndTriggeringPolicy(timeBasedTriggering); //Set the rolling policy as a parent to the triggering policy timeBasedTriggering.setTimeBasedRollingPolicy(rollingPolicy); //Set up a Pattern PatternLayout layout = new PatternLayout(); layout.setPattern("%d{yyyy-MM-dd HH:mm:ss},%t %m%n"); //Set up the Appender RollingFileAppender<ILoggingEvent> rollingFileAppender = new RollingFileAppender<ILoggingEvent>(); rollingFileAppender.setContext(lc); rollingFileAppender.setAppend(true); rollingFileAppender.setBufferedIO(true); rollingFileAppender.setBufferSize(16000000); rollingFileAppender.setPrudent(false); rollingFileAppender.setImmediateFlush(false); rollingFileAppender.setLayout(layout); //Start! timeBasedTriggering.start(); rollingPolicy.start(); layout.start(); rollingFileAppender.start(); On Wed, Sep 9, 2009 at 11:17 AM, Nitro Star <nitrostar1@gmail.com> wrote:

Hi!

I have been playing with logback for a couple of days and find a lot of its functionality amazing! I have a couple of questions that I was wondering if I could address!

I'm using logback to log information about a java server that I'm setting up. I want my log files to change every half hour and to never exceed 500MB. I would also like the logging system to cache 16MB of data before flushing to disk! Finally, I want the fileNamePattern to depend on the hostname where I'm running the server!

So this are my questions: a. I have found a way for the log files to change every hour, but not every half hour... Is there a way to do this? Is there a way I can define my own RollingPolicy? b. Is there a way for me to define the fileNamePattern somewhere else other than in the logback.xml file? c. Is there a flush() function I can call when my server exists?

For b. I have tried something like:

LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory(); Logger logger = lc.getLogger("ROOT");

RollingFileAppender<ILoggingEvent> app = (RollingFileAppender<ILoggingEvent>)logger.getAppender("RootFileAppender"); RollingPolicyBase rollingPolicy = (RollingPolicyBase)app.getRollingPolicy(); rollingPolicy.stop();

rollingPolicy.setFileNamePattern("bidderserver-%d{yyyy-MM-dd-HH:mm:ss}-"+hostname+"-ip.%i.log"); rollingPolicy.start();

But that doesn't seem to work :(

I'm attaching my current logback.xml file.

Any and all help would be much appreciated!

Also, I tried visiting #qos.ch in freenode, but there's noone there except me!

Thanks again, Daniel