when writing a custom Dispatcher, is there a way t...

# coroutines

[janvladimirmostert]

when writing a custom Dispatcher, is there a way to tell IntelliJ to not show warnings about

Possibly blocking call in non-blocking context could lead to thread starvation

Dispatchers.IO somehow manages to make such warnings go away, I want to make those warnings go away for my custom dispatcher too

launch(Dispatchers.CUSTOM) {
   println(Thread.currentThread())
   Thread.sleep(5_000) <<-- warning: Possibly blocking call ...
   delay(5_000)
   println("done!!!")
}

[Riccardo Lippolis]

The JetBrains java-annotations library contains a @BlockingExecutor annotation that sounds like the thing you need. I haven't actually tried it to see if it fixes the IntelliJ warning, but it would surprise me if it didn't 😅 : https://javadoc.io/doc/org.jetbrains/annotations/latest/org/jetbrains/annotations/BlockingExecutor.html

[janvladimirmostert]

that works, thanks!!

there's also an @Language annotation in there so you can annotate for example

doSomethingWithSQL(@Language("sql") sql: String)

now whenever you call doSomethingWithSQL("SELECT * FROM ...") you get syntax highlighting

I need to dig a bit more into that jetbrains annotations library, seems super useful!

[Remi Latapy]

Untitled.cpp

Untitled.cpp

[janvladimirmostert]

This is how I used it in my article: https://kt.academy/article/dispatcher-loom

val Dispatchers.LOOM: @BlockingExecutor CoroutineDispatcher
    get() = Executors.newVirtualThreadPerTaskExecutor().asCoroutineDispatcher()

[janvladimirmostert]

that looks like a Spring problem though

[Remi Latapy]

Yes dagger/hilt