GroupRollingFileAppender.java 文件源码

@Override
protected void append(LoggingEvent event) {
    String group = (String) event.getMDC(GROUP_KEY);
    if ("".equals(group))
        group = DEFALUT_GROUP_NAME;
    if (!checkEntryConditions())
        return;
    try {
        CountingQuietWriterEx qw = writers.get(group);
        if (qw == null) {
            qw = addCQWriter(group, getMaxLogBlockIndex(group), true);
        }
        if (qw != null)
            subAppend(qw, event);
    } catch (IOException e) {
        LogLog.error("写日志文件失败：" + group, e);
    }
}