Evolution of asynchrony in (ASP).NET

Asynchrony in (ASP).NET Aliaksandr Famin [email_address] @AlexSane

Developer and a Kettle ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Comparison Approach Transferring 1K, rps Transferring 1M, rps Sync 2844,44 100% 32,57 26% Async with callbacks 2547,26 90% 125,97 100% Async - sync 2327,28 82% 33,04 26% Sync with threads 861,23 30% 83,89 67% Async with threads 604,84 21% 80,36 64%

Evolution: WinAPI ,[object Object],[object Object]

Evolution: .NET 1.0 – 1.1 ,[object Object],[object Object],[object Object],[object Object]

Evolution: .NET 2.0 – … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Evolution: .NET 4.0 ,[object Object]

IAsyncResult vs Events ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ContextAwareResult, but no guarantee

Event-based async pattern SyncronizationContext Thread #1 XAsync YAsync Thread #3 YCompleted Thread #2 ZAsync Thread #4 ZCompleted AsyncOperationManager PreRenderComplete PreRender X Y XCompleted Z All operations are completed

TTT #1: Use closures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TTT#2: Use userState carefully ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TTT#3: Unsubscribe from events ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TTT#5: There is no timeout support in both async patterns

TTT#6 AsyncResult callbacks don’t have HttpContext ,[object Object]

TTT#7 Do not convert event-based pattern to IAsyncResult one ,[object Object]

TTT #8: Do not use [ThreadStatic] ,[object Object]

TTT#9: Do not throw exceptions in callbacks ,[object Object]

Evolution of asynchrony in (ASP).NET

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