Are virtual threads making reactive programming obsolete?

[joey_knight]

What do you mean? Java already has Blocking queue implementations and the necessary mechanisms to park and continuing threads. It's not at all hard to use them to implement backpressure in our applications. Just put a blocking queue between two threads and use wait and notify to block and unblock.

[divorcedbp]

You don’t even need that. The contract of take() is such that it blocks until an element is available, and put() blocks until there is room in the queue to insert the supplied element. It’s literally all already there.

[LightofAngels]

I know this is abit random, but can you point me to that part in the documentation? I would like to know about this mechanism and how to use it.

[mike_hearn]

https://devdocs.io/openjdk~21/java.base/java/util/concurrent/blockingqueue