func (f *FileLogger) isMustSplit() bool {

	switch f.splitType {
	case SplitType_Size:
		logFile := joinFilePath(f.fileDir, f.fileName)
		if f.fileCount > 1 {
			if fileSize(logFile) >= f.fileSize {
				return true
			}
		}
	case SplitType_Daily:
		t, _ := time.Parse(DATEFORMAT, time.Now().Format(DATEFORMAT))
		if t.After(*f.date) {
			return true
		}
	}

	return false
}
func (f *FileLogger) isMustSplit() bool {

	switch f.splitType {
	case SplitType_Size:
		logFile := joinFilePath(f.fileDir, f.fileName)
		if f.fileCount > 1 {
			if fileSize(logFile) >= f.fileSize {
				return true
			}
		}
	case SplitType_Daily:
		t, _ := time.Parse(DATEFORMAT, time.Now().Format(DATEFORMAT))
		if t.After(*f.date) {
			return true
		}
	}

	return false
}
// used for determine the fileLogger f is time to split.
// size: once the current fileLogger's fileSize >= config.fileSize need to split
// daily: once the current fileLogger stands for yesterday need to split