{"id":24271705,"url":"https://github.com/soenneker/soenneker.utils.singletondictionary","last_synced_at":"2026-01-08T17:20:55.166Z","repository":{"id":152068818,"uuid":"612798867","full_name":"soenneker/soenneker.utils.singletondictionary","owner":"soenneker","description":"An externally initializing singleton dictionary that uses double-check asynchronous locking, with optional async and sync 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![](https://user-images.githubusercontent.com/4441470/224455560-91ed3ee7-f510-4041-a8d2-3fc093025112.png) Soenneker.Utils.SingletonDictionary\n\n### A flexible singleton dictionary with double-check async locking, sync/async disposal, and external initialization\n\n---\n\n## Features\n\n* ✅ Async and sync initialization patterns\n* ✅ Optional cancellation support\n* ✅ Async and sync access methods\n* ✅ Fully disposable (sync and async)\n* ✅ Thread-safe with `AsyncLock` from [Nito.AsyncEx](https://github.com/StephenCleary/AsyncEx)\n\n---\n\n## Installation\n\n```bash\ndotnet add package Soenneker.Utils.SingletonDictionary\n```\n\n---\n\n## ✨ Example Usage\n\nHere’s an example using `SingletonDictionary` to manage singleton `HttpClient` instances keyed by configuration (e.g. timeout):\n\n```csharp\npublic class HttpRequester : IDisposable, IAsyncDisposable\n{\n    private readonly SingletonDictionary\u003cHttpClient\u003e _clients;\n\n    public HttpRequester()\n    {\n        _clients = new SingletonDictionary\u003cHttpClient\u003e((args) =\u003e\n        {\n            var socketsHandler = new SocketsHttpHandler\n            {\n                PooledConnectionLifetime = TimeSpan.FromMinutes(10),\n                MaxConnectionsPerServer = 10\n            };\n\n            var client = new HttpClient(socketsHandler)\n            {\n                Timeout = TimeSpan.FromSeconds((int)args[0])\n            };\n\n            return client;\n        });\n    }\n\n    public async ValueTask Get()\n    {\n        var client = await _clients.Get(\"100\", 100);\n        await client.GetAsync(\"https://google.com\");\n    }\n\n    public async ValueTask DisposeAsync()\n    {\n        GC.SuppressFinalize(this);\n        await _clients.DisposeAsync();\n    }\n\n    public void Dispose()\n    {\n        GC.SuppressFinalize(this);\n        _clients.Dispose();\n    }\n}\n```\n\n---\n\n## 🔍 Internals\n\n`SingletonDictionary\u003cT\u003e` is backed by a `ConcurrentDictionary\u003cstring, T\u003e` and supports:\n\n* Multiple constructor overloads for async/sync factory functions\n* Internal double-checked locking on access\n* Deferred/lazy factory execution\n* Proper disposal of values (both sync and async interfaces)\n* Safe mutation via `SetInitialization` before first use\n\nExample constructor overloads include:\n\n```csharp\nnew SingletonDictionary\u003cT\u003e(Func\u003cstring, object[], ValueTask\u003cT\u003e\u003e factory);\nnew SingletonDictionary\u003cT\u003e(Func\u003cobject[], T\u003e factory);\nnew SingletonDictionary\u003cT\u003e(Func\u003cstring, CancellationToken, object[], ValueTask\u003cT\u003e\u003e factory);\n// And more...\n```\n\nYou can also initialize manually:\n\n```csharp\nvar dict = new SingletonDictionary\u003cMyService\u003e();\ndict.SetInitialization((args) =\u003e new MyService(args));\n```\n\n---\n\n## 🛡️ Thread Safety\n\nThis library uses [`AsyncLock`](https://github.com/StephenCleary/AsyncEx) for safe concurrent access in async contexts, and synchronously via `Lock()` for blocking methods. This avoids race conditions and guarantees safe singleton creation.","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsoenneker%2Fsoenneker.utils.singletondictionary","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsoenneker%2Fsoenneker.utils.singletondictionary","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsoenneker%2Fsoenneker.utils.singletondictionary/lists"}