I know this is everyone s favorite question but are there an

Question

I know this is everyone s favorite question but are there any updates on async server support either via coroutines or some other mechanism Last mention of coroutines in this room that I could find was back in September the GitHub issue was last updated in June and the v4 Spike branch was last updated in October Is anyone working on async server support or has that been put on hold

dave · Answer

TBH it s not being worked on at the moment the main issues we face are to get the model plugged into the various servers and clients Which definitely isn t simple disappointed

Jordan Terrell · Answer

Is there a writeup of the challenges somewhere I can read up on

s4nchez · Answer

< Jordan Terrell> probably worth catching up with the discussion in this issue that has most of the context and the challenges to add this support

James Richardson · Answer

I hope you don t mind me asking but I m really interested in your use case for async that the current model doesn t support What is the limit that you have hit in your current deployment

Jordan Terrell · Answer

At the moment nothing But it s a point against Http4k when proposing it s usage at some companies

natpryce · Answer

What is the point against that these companies have

andrzej · Answer

I believe this is more a general question when we discuss which web framework library to use one of the arguments is support for async model Why async Because it is regarded as more efficient especially when it comes to threads usage in high load envs I don t have exact data for comparison async vs sync because I never implemented exactly the same system two times one in async and one in sync model

andrzej · Answer

In some ecosystems async is a natural way nobody s questioning that e g scala I can see that these concepts are slowly moving to Kotlin as well especially after coroutines made production ready

andrzej · Answer

So any concrete answer from http4k team to question what about async even if that is only a plan an example of a home made solution or a tutorial how to implement async in lower layers of your app that plays nicely with http4k part would help to wider adopt http4k

Jordan Terrell · Answer

< natpryce> Http4k is to some degree contending with ktor micronaught springboot etc These are not apples to apples comparisons by any means However when picking libraries frameworks to handle HTTP requests often a point by point comparison is done Lack of good async coroutine support comes up against Http4k from time to time That was the only point I was making Where I ve used Http4k has mainly been CPU or memory bound so it s been a good fit but in an IO bound scenario async coroutine support would likely be very beneficial

natpryce · Answer

Async is about trading off straight line performance to reduce the total OS and therefore hardware resources required to serve all your concurrent clients When your cloud provider is allocating resources for you per request that trade off isn t available

natpryce · Answer

So HTTP4K is a better fit for cloud functions than async frameworks smile