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Discussion on: Why I stopped using Coroutines in Kotlin

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Matthew Cory

Having to add a new breakpoint is a potential deal breaker? Sorry, in my debugging sessions I've got anywhere from 10-20 going at a time and I add and remove them as the need arises.

Having to pass state along as a parameter to functions (unless you can get the coroutine context going) is a practice I'd encourage anyways over thread local. I've had to rewrite stuff at work because it depended on ThreadLocal instead of a supplied state, and reactive code has the same "issues" as coroutines. We had issues of our own figuring out how to get a reactive context working with Flux/Mono code so we wrote our own stuff to deal with it. Took a day, give or take, and we can use that elsewhere.

The only point you've made that's a potential deal breaker is regarding locks and synchronized blocks. That's not something I considered and thank you for pointing it out. Roman commented on this thread; I'd love to hear his take on that because I've never read anything about whether they're needed or how they're supposed to be dealt with (if at all). Maybe you came across a legitimate bug.

That said, I've been fortunate enough that in almost 20 years of Java work I've yet to work with threads to such a level I really needed synchronization or locks. I've found it's far easier to create immutable objects in spite of the added boilerplate they require; then you don't have to worry about race conditions. I have yet to come across an instance where that's not possible, but I'm sure they're out there and when that comes up this would be good to know.

Lukasz' argument applies perfectly. It has nothing to do with efficincy. You're having problems dealing with a different way of handling something you're used to doing. Instead of approaching this as "here's some gotchas I found in coroutines and how to work around them" you came it as they're crap and you recommend avoiding them. And because you legitimately think an extra breakpoint is a problem I'm not inclined to take your opinion very highly on this.

You should respond to Roman. He's got a bit of insight on Kotlin and coroutines. His feedback might be useful.