{"id":20850001,"url":"https://github.com/david-desmaisons/composableasync","last_synced_at":"2025-09-05T03:41:05.439Z","repository":{"id":56521678,"uuid":"43605619","full_name":"David-Desmaisons/ComposableAsync","owner":"David-Desmaisons","description":"Create, compose and inject asynchronous behaviors in .Net Framework and .Net 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Async\n================\n\n[![build](https://img.shields.io/appveyor/ci/David-Desmaisons/ComposableAsync.svg)](https://ci.appveyor.com/project/David-Desmaisons/ComposableAsync)\n[![NuGet Badge](https://buildstats.info/nuget/ComposableAsync.Core?includePreReleases=true)](https://www.nuget.org/packages/ComposableAsync.Core/)\n[![MIT License](https://img.shields.io/github/license/David-Desmaisons/ComposableAsync.svg)](https://github.com/David-Desmaisons/ComposableAsync/blob/master/LICENSE)\n\nCreate, compose and inject asynchronous behaviors in .Net Framework and .Net Core.\n\n# Goal\n\n* Create asynchronous behavior such as [fiber](https://www.wikiwand.com/en/Fiber_(computer_science)), rate limiter, [circuit breaker](https://www.wikiwand.com/en/Circuit_breaker_design_pattern).\n\n* Compose these behaviors and use them as building blocks with [aspect oriented programming](https://www.wikiwand.com/en/Aspect-oriented_programming).\n\n* Provide a lightweight way inject these behaviors to transform POCOs in [actors](https://en.wikipedia.org/wiki/Actor_model).\n\n\n# Create asynchronous behavior\n\nAsynchronous behaviors are implemented using [IDispatcher abstraction](http://david-desmaisons.github.io/ComposableAsync/core-api/ComposableAsync.IDispatcher.html). \n\nComposable Async provides various dispatchers implementation:\n\n\n## Retry\n\n```C#\n// Create dispatcher that catch all ArgumentException and retry for ever with a delay of 200 ms\nvar retryDispatcher = RetryPolicy.For\u003cArgumentException\u003e()\n\t\t\t.WithWaitBetweenRetry(TimeSpan.FromSeconds(0.2))\n\t\t\t.ForEver();\n```\n\nSee more at [ComposableAsync.Resilient](http://david-desmaisons.github.io/ComposableAsync/resilient-api/index.html#retrypolicy)\n\n## Circuit-Breaker\n\n```C#\n// Create dispatcher that catch all ArgumentException and retry for ever with a delay of 200 ms\nvar retryDispatcher = CircuitBreakerPolicy.For\u003cTimeoutException\u003e()\n\t\t\t.WithRetryAndTimeout(10, TimeSpan.FromMilliseconds(500));\n```\n\nSee more at [ComposableAsync.Resilient](http://david-desmaisons.github.io/ComposableAsync/resilient-api/index.html#circuitbreakerpolicy)\n\n## Fiber\n\n```C#\n// Create dispatcher that dispatch all action on the same thread\nvar fiberDispatcher = Fiber.CreateMonoThreadedFiber();\n```\n\nSee more at [ComposableAsync.Concurrent](http://david-desmaisons.github.io/ComposableAsync/concurrent-api/index.html)\n\n##  RateLimiter\n\n```C#\n// Create dispatcher that dispatch all action on the same thread\nvar timeConstraint = TimeLimiter.GetFromMaxCountByInterval(5, TimeSpan.FromSeconds(1));\n```\n\nSee more at [RateLimiter](https://github.com/David-Desmaisons/RateLimiter)\n\n\n# Compose dispatchers\n\nUse then extension methods to create a dispatcher that will execute sequentially dispatchers\n\n```C#\n/// \u003csummary\u003e\n/// Returns a composed dispatcher applying the given dispatchers sequentially\n/// \u003c/summary\u003e\n/// \u003cparam name=\"dispatcher\"\u003e\u003c/param\u003e\n/// \u003cparam name=\"others\"\u003e\u003c/param\u003e\n/// \u003creturns\u003e\u003c/returns\u003e\npublic static IDispatcher Then(this IDispatcher dispatcher, IEnumerable\u003cIDispatcher\u003e others)\n```\n\n```C#\nvar composed = fiberDispatcher.Then(timeConstraint);\n```\n\n# Use dispatchers\n\n## Await dispatcher\n\n```C#\nawait fiberDispatcher;\n// After the await, the code executes in the dispatcher context\n// In this case the code will execute on the fiber thread\nConsole.WriteLine($\"This is fiber thread {Thread.CurrentThread.ManagedThreadId}\");\n```\n\n## As httpDelegateHandler\n\nTransform a dispatcher into [HttpMessageHandler](https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httpmessagehandler?view=netframework-4.8) with AsDelegatingHandler extension method:\n```C#\n/// Using time limiter nuget\nvar handler = TimeLimiter\n\t.GetFromMaxCountByInterval(60, TimeSpan.FromMinutes(1))\n\t.AsDelegatingHandler();\nvar client = new HttpClient(handler);\n```\n\n## As wrapper for proxy Factory\n\nUsing `ComposableAsync.Factory`, with this option all methods call to the proxyfied object are wrapped using the provided dispatcher.\n\n```C#\nvar retryDispatcher = RetryPolicy.For\u003cSystemException\u003e().ForEver();\n\nvar originalObject = new BusinessObject();\nvar proxyFactory = new ProxyFactory(retryDispatcher);\nvar proxyObject = proxyFactory.Build\u003cIBusinessObject\u003e(originalObject);\n\n// The call to the originalObject will be wrapped into a retry policy for SystemException\nvar res = await proxyObject.Execute(cancellationToken);\n```\n\n# Actors\n\n`ComposableAsync.Concurrent` also provides an [actor](https://en.wikipedia.org/wiki/Actor_model) factory based on fiber and proxy factory.\n\n```C#\n// Instantiate actor factory\nvar builder = new ActorFactoryBuilder();\nvar factory = builder.GetActorFactory(shared: false);\n// When shared is true, all actor leaves in the same thread,\n// when shared is false, each actor leaves in its own thread.\n\n// Instantiate an actor from a POCO\nvar fooActor = fact.Build\u003cIFoo\u003e(new ConcreteFoo());\n```\n\nSee more at [ComposableAsync.Concurrent](http://david-desmaisons.github.io/ComposableAsync/concurrent-api/index.html)\n\n# Nuget\n\nFor core functionality:\n\n```\nInstall-Package ComposableAsync.Core\n```\n\nFor factories:\n\n```\nInstall-Package ComposableAsync.Factory\n```\n\nFor actors:\n\n```\nInstall-Package ComposableAsync.Concurrent\n```\n\nFor retry and circuit-breaker:\n\n```\nInstall-Package ComposableAsync.Resilient\n```\n\n[Go nuget packages](https://www.nuget.org/packages/ComposableAsync.Core/)\n\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdavid-desmaisons%2Fcomposableasync","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdavid-desmaisons%2Fcomposableasync","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdavid-desmaisons%2Fcomposableasync/lists"}