Method subDir

internal/caches/storage_file.go:1645–1671

获取目录

(hash string)

// 获取目录
func (this *FileStorage) subDir(hash string) (dirPath string, dirIsFull bool) {
	var suffix = "/p" + types.String(this.policy.Id) + "/" + hash[:2] + "/" + hash[2:4]

	if len(hash) < 4 {
		return this.options.Dir + suffix, this.mainDiskIsFull
	}

	var subDirs = this.subDirs // copy slice
	var countSubDirs = len(subDirs)
	if countSubDirs == 0 {
		return this.options.Dir + suffix, this.mainDiskIsFull
	}

	countSubDirs++ // add main dir

	// 最多只支持16个目录
	if countSubDirs > 16 {
		countSubDirs = 16
	}

	var dirIndex = this.charCode(hash[0]) % uint8(countSubDirs)
	if dirIndex == 0 {
		return this.options.Dir + suffix, this.mainDiskIsFull
	}
	var subDir = subDirs[dirIndex-1]
	return subDir.Path + suffix, subDir.IsFull
}

// ScanGarbageCaches 清理目录中“失联”的缓存文件
// “失联”为不在HashMap中的文件