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
<

Answer 1

It works for me, using the following class as timeBasedFileNamingAndTriggeringPolicy :

import java.io.File;
import java.util.concurrent.atomic.AtomicBoolean;

import ch.qos.logback.core.joran.spi.NoAutoStart;
import ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP;

@NoAutoStart
public class Trigger extends SizeAndTimeBasedFNATP
{
    private final AtomicBoolean trigger = new AtomicBoolean();

    public boolean isTriggeringEvent(final File activeFile, final E event) {
        if (trigger.compareAndSet(false, true) && activeFile.length() > 0) {
            String maxFileSize = getMaxFileSize();
            setMaxFileSize("1");
            super.isTriggeringEvent(activeFile, event);
            setMaxFileSize(maxFileSize);
            return true;
        }
        return super.isTriggeringEvent(activeFile, event);
    }
}