Направляющие для имен файлов, автоматически расширяющие иерархию папок, содержащую не более пары тысяч файлов / папок в каждой папке. Резервное копирование новых файлов выполняется путем резервного копирования новых папок.
Вы не указали, какую среду и / или язык программирования вы используете, но вот пример C # / .net / Windows:
using System;
using System.IO;
using System.Xml.Serialization;
/// <summary>
/// Class for generating storage structure and file names for document storage.
/// Copyright (c) 2008, Huagati Systems Co.,Ltd.
/// </summary>
public class DocumentStorage
{
private static StorageDirectory _StorageDirectory = null;
public static string GetNewUNCPath()
{
string storageDirectory = GetStorageDirectory();
if (!storageDirectory.EndsWith("\\"))
{
storageDirectory += "\\";
}
return storageDirectory + GuidEx.NewSeqGuid().ToString() + ".data";
}
public static void SaveDocumentInfo(string documentPath, Document documentInfo)
{
//the filestream object don't like NTFS streams so this is disabled for now...
return;
//stores a document object in a separate "docinfo" stream attached to the file it belongs to
//XmlSerializer ser = new XmlSerializer(typeof(Document));
//string infoStream = documentPath + ":docinfo";
//FileStream fs = new FileStream(infoStream, FileMode.Create);
//ser.Serialize(fs, documentInfo);
//fs.Flush();
//fs.Close();
}
private static string GetStorageDirectory()
{
string storageRoot = ConfigSettings.DocumentStorageRoot;
if (!storageRoot.EndsWith("\\"))
{
storageRoot += "\\";
}
//get storage directory if not set
if (_StorageDirectory == null)
{
_StorageDirectory = new StorageDirectory();
lock (_StorageDirectory)
{
string path = ConfigSettings.ReadSettingString("CurrentDocumentStoragePath");
if (path == null)
{
//no storage tree created yet, create first set of subfolders
path = CreateStorageDirectory(storageRoot, 1);
_StorageDirectory.FullPath = path.Substring(storageRoot.Length);
ConfigSettings.WriteSettingString("CurrentDocumentStoragePath", _StorageDirectory.FullPath);
}
else
{
_StorageDirectory.FullPath = path;
}
}
}
int fileCount = (new DirectoryInfo(storageRoot + _StorageDirectory.FullPath)).GetFiles().Length;
if (fileCount > ConfigSettings.FolderContentLimitFiles)
{
//if the directory has exceeded number of files per directory, create a new one...
lock (_StorageDirectory)
{
string path = GetNewStorageFolder(storageRoot + _StorageDirectory.FullPath, ConfigSettings.DocumentStorageDepth);
_StorageDirectory.FullPath = path.Substring(storageRoot.Length);
ConfigSettings.WriteSettingString("CurrentDocumentStoragePath", _StorageDirectory.FullPath);
}
}
return storageRoot + _StorageDirectory.FullPath;
}
private static string GetNewStorageFolder(string currentPath, int currentDepth)
{
string parentFolder = currentPath.Substring(0, currentPath.LastIndexOf("\\"));
int parentFolderFolderCount = (new DirectoryInfo(parentFolder)).GetDirectories().Length;
if (parentFolderFolderCount < ConfigSettings.FolderContentLimitFolders)
{
return CreateStorageDirectory(parentFolder, currentDepth);
}
else
{
return GetNewStorageFolder(parentFolder, currentDepth - 1);
}
}
private static string CreateStorageDirectory(string currentDir, int currentDepth)
{
string storageDirectory = null;
string directoryName = GuidEx.NewSeqGuid().ToString();
if (!currentDir.EndsWith("\\"))
{
currentDir += "\\";
}
Directory.CreateDirectory(currentDir + directoryName);
if (currentDepth < ConfigSettings.DocumentStorageDepth)
{
storageDirectory = CreateStorageDirectory(currentDir + directoryName, currentDepth + 1);
}
else
{
storageDirectory = currentDir + directoryName;
}
return storageDirectory;
}
private class StorageDirectory
{
public string DirectoryName { get; set; }
public StorageDirectory ParentDirectory { get; set; }
public string FullPath
{
get
{
if (ParentDirectory != null)
{
return ParentDirectory.FullPath + "\\" + DirectoryName;
}
else
{
return DirectoryName;
}
}
set
{
if (value.Contains("\\"))
{
DirectoryName = value.Substring(value.LastIndexOf("\\") + 1);
ParentDirectory = new StorageDirectory { FullPath = value.Substring(0, value.LastIndexOf("\\")) };
}
else
{
DirectoryName = value;
}
}
}
}
}