如何刷新缓冲的log4j FileAppender？

Question

在log4j中,当使用具有BufferedIO = true和BufferSize = xxx属性的FileAppender(即启用了缓冲)时,我希望能够在正常关闭过程中刷新日志.关于如何做到这一点的任何想法？

Answer 1

管理回答我自己的问题:-)

关闭LogManager时:

LogManager.shutdown();

所有缓冲的日志都被刷新.

Answer 2

public static void flushAllLogs()
{
    try
    {
        Set<FileAppender> flushedFileAppenders = new HashSet<FileAppender>();
        Enumeration currentLoggers = LogManager.getLoggerRepository().getCurrentLoggers();
        while(currentLoggers.hasMoreElements())
        {
            Object nextLogger = currentLoggers.nextElement();
            if(nextLogger instanceof Logger)
            {
                Logger currentLogger = (Logger) nextLogger;
                Enumeration allAppenders = currentLogger.getAllAppenders();
                while(allAppenders.hasMoreElements())
                {
                    Object nextElement = allAppenders.nextElement();
                    if(nextElement instanceof FileAppender)
                    {
                        FileAppender fileAppender = (FileAppender) nextElement;
                        if(!flushedFileAppenders.contains(fileAppender) && !fileAppender.getImmediateFlush())
                        {
                            flushedFileAppenders.add(fileAppender);
                            //log.info("Appender "+fileAppender.getName()+" is not doing immediateFlush ");
                            fileAppender.setImmediateFlush(true);
                            currentLogger.info("FLUSH");
                            fileAppender.setImmediateFlush(false);
                        }
                        else
                        {
                            //log.info("fileAppender"+fileAppender.getName()+" is doing immediateFlush");
                        }
                    }
                }
            }
        }
    }
    catch(RuntimeException e)
    {
        log.error("Failed flushing logs",e);
    }
}

Answer 3

public static void flushAll() {
    final LoggerContext logCtx = ((LoggerContext) LogManager.getContext());
    for(final org.apache.logging.log4j.core.Logger logger : logCtx.getLoggers()) {
        for(final Appender appender : logger.getAppenders().values()) {
            if(appender instanceof AbstractOutputStreamAppender) {
                ((AbstractOutputStreamAppender) appender).getManager().flush();
            }
        }
    }
}