How to roll the log file on startup in logback

Question

I would like to configure logback to do the following.

• Log to a file
• Roll the file when it reaches 50MB
• Only keep 7 days worth of logs
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Answer 1

I got the following to work (combining ideas from previous answers). Note I was dealing with size-based files, not time-based, but I am guessing the same solution works.

public class StartupSizeBasedTriggeringPolicy extends ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy {

private final AtomicReference isFirstTime = new AtomicReference(true);

@Override
public boolean isTriggeringEvent(final File activeFile, final E event) {

    //this method appears to have side-effects so always call
    boolean result = super.isTriggeringEvent(activeFile, event);

    return isFirstTime.compareAndSet(true, false) || result;
}

}