RollingFileAppender.java 文件源码

/**
   This method differentiates RollingFileAppender from its super
   class.

   @since 0.9.0
*/
protected
void subAppend(LoggingEvent event) {
  super.subAppend(event);
  if((fileName != null) &&
                   ((CountingQuietWriter) qw).getCount() >= maxFileSize)
    this.rollOver();
 }