Cross-platform, small and super fast file-based storage library

AcroFS is a tiny, cross-platform and super fast file system based storage library that can manage huge amount of files on your file system.

It also provides a persistent caching layer for .Net IMemoryCache to benefit both file caching and memory caching together!

File store quick examples :

// Get the default store
var _repository = FileStore.CreateStore();

// store
var docId = _repository.Store(data);

// load
var data = _repository.Load(docId);

// store models with a custpm key
_repository.Store("the-key", myModel);

// load model
var model = _repository.Load<MyModel>("the-key", myModel);

Persistent cache quick examples :

// set cache
_memoryCache.Persistent().Set(key, value, TimeSpan.FromMinutes(1));

// get cache
var found = _memoryCache.Persistent().TryGetValue(cacheKey, out result);

// get or create
var cachedResult = await _memoryCache.Persistent().GetOrCreate(cacheKey, async entry =>
{
    entry.SlidingExpiration = TimeSpan.FromSeconds(10);

    var result = await loadMyDataAsync();
    
    return result;
});

Features

• Multiple Storage
• Sub Storages
• Persistent cache layer for .Net IMemoryCache
• Json Serialization/Deserialization
• GZip Compression / Decompression for text files
• Store/Load Models, Objects, Texts and Streams
• Store/Load Attachments related to a doc
• Assigns unique ids automatically
• .Net Core / Mono / Linux / Mac Support

Download

Examples

Create or get the default repository

var _repository = FileStore.CreateStore();

All files will be stored in ./Data/default-store

Store and load models

// store    
long docId = _repository.Store<MyModel>(model1);

// load
var myModel = _repository.Load<MyModel>(docId));

Store and load by a key

var key ="MyModel";
// store
_store.StoreByKey(key, data);

// load
var myModel = _repository.Load<MyModel>(key);

Store and load texts

// store    
long docId = _repository.StoreText("the content");

// load
Assert.Equal("the content", _repository.LoadText(docId));

Store and load Streams

// store    
long docId = _repository.Store(theStream);

// load
var myStream = _repository.Load(docId));

Use simple path instead of hashed path

var _repository = FileStore.CreateStore()
    .UseSimplePath();

var key ="MyModel.json";
// store
_store.StoreByKey(key, data);

// load
var myModel = _repository.Load<MyModel>(key));

Create the store in a custom location

var _repository = FileStore.CreateStore("c:\\store1");

Attachments

// create doc
long docId = _repository.StoreText("the content");

// store two attachments
_repository.Attach(docId, "attach-name-1", "attachment content 1");
_repository.Attach(docId, "attach-name-2", "attachment content 2");

_repository.Attach(docId, "attach-name-3", myModel);


// load all attachments as list of strings
IList<string> attachs = _repository.LoadTextAttachments(docId);

// load all attachments as list of streams
IList<Stream> attachs = _repository.LoadStreamAttachments(docId);

// load "attach-name-1" 
string myAttachmentText = _repository.LoadTextAttachment(docId, "attach-name-1");

// load "attach-name-3" 
MyModel modelAttachment = _repository.LoadAttachment<MyModel>(docId, "attach-name-3");

// load all attachments as MyModel 
IList<MyModel> myModelList = _repository.LoadAttachments<MyModel>(docId);

GZip Compresion for Texts

// store    
long docId = _repository.StoreText("a large text", 
    options: StoreOptions.Compress);

// load
var myText = _repository.LoadText(docId, 
    options: LoadOptions.Decompress);

Objects also support gzip compresstion

Sub Storage

//  creating news docs
long newsId1 = _repository.StoreText("news content 1", "news");
long newsId2 = _repository.StoreText("news content 2", "news");

//  creating articles docs
long articleId1 = _repository.StoreText("article content 1", "article");
long articleId2 = _repository.StoreText("article content 2", "article");

//  loading
Assert.Equal("news content 1", _repository.LoadText(newsId1, "news"));
Assert.Equal("article content 2", _repository.LoadText(articleId2, "article"));

The output File System :

StorageRoot\news\...\01
                 ...\02

StorageRoot\article\...\01
                    ...\02

FileCache

Its a persistent layer for IMemoryCache

Instantiation

IMemoryCache _memoryCache; // resolve it via .net dependency injection
FileCache _cache = memoryCache.Persistent();

There is no overhead on Persistent() method so you can use it each time you want to use file cache over memory cache : _memoryCache.Persistent().Set(...) or _memoryCache.Persistent().GetOrCreate(...)

Create persistent cache with absolute expiration

var key = "myKey";
var value = "myValue";

// store into both memory and file together
_cache.Set(key, value, TimeSpan.FromMinutes(1));;

// retrive the cached value
var found = _cache.TryGetValue(key, out result);

If the cached item wasn't found inside the memory, then the file cache will be loaded.

According to .Net IMemoryCache If you specify DateTimeOffset it will be used as absolute expiration and if you specify TimeSpan it will be used as absolute expiration relative to now.

Caching models

var myModel = new MyModel(...);

// store into both memory and file together
_cache.Set(cacheKey, myModel, TimeSpan.FromMinutes(1));;

// retrive the cached value
MyModel result;
var found = _cache.TryGetValue(cacheKey, out result);

GetOrCreate

var cachedResult = await _cache.GetOrCreate(cacheKey, async entry =>
{
    entry.SlidingExpiration = TimeSpan.FromSeconds(10);

    var result = await loadMyDataAsync();
    
    return result;
});

How it works

It keeps the last ID in memory and generates new ones by a simple atomic +1 operation and so it's very fast. It converts a doc id into a hex number and stores it as 4 hirarchy folders

StorageRoot\12\31\26\5A\17

The last hex number ( in this example 17 ) is the final file name.

You can assign attachments to a file. They are stored as Filename[-]AttachName

For example, two attachment files are assigned to documentId 17 as following file names:

StorageRoot\...\17
            ...\17-attachmentFile1
            ...\17-attachmentFile2