Update the current Scheduler api?

[He-Pin]

Hi I am still new on cats-effect ,but I think the current api of Scheduler can be updated with :

trait Scheduler {
  type TimerId= Long

  def scheduleOnce(delay: FiniteDuration, task: Runnable): TimerId

   def scheduleWithFixedDelay(initialDelay:FiniteDuration, delay: FiniteDuration, task: Runnable):TimerId

   def scheduleAtFixedRate(initialDelay:FiniteDuration, delay: FiniteDuration, task: Runnable):TimerId

   def cancel(timerId:TimerId):Boolean

   def clock(): Clock
   ...
  ...
}

And seems like the only way to cancel the current scheduled task is by call the returning Runnable with the current Scheduler api?

As I'm starting using vertx these days, and I think the cats.effect.unsafe.WorkerThread can do the scheduling too, just as Netty's Eventloop does, which employed an PriorityQueue to do that.

[armanbilge]

And seems like the only way to cancel the current scheduled task is by call the returning Runnable with the current Scheduler api?

That's correct. Unfortunately, we cannot change the API at this point due to compatibility constraints.

---

As I'm starting using vertx these days, and I think the cats.effect.unsafe.WorkerThread can do the scheduling too, just as Netty's Eventloop does, which employed an PriorityQueue to do that.

It can, and it will very soon! See this PR:

• Integrated timers #3219

[He-Pin]

And then, a user can using a HashWheelTimer which turn out the timeout as an event and send to the workerThread's taskQueue.

Update:
Thanks, I will take sometime to learn from this new PR.

[lqhuang]

That's correct. Unfortunately, we cannot change the API at this point due to compatibility constraints.

@armanbilge May I have a question about when or what conditions are satisfied, then we could make improvements and break compatibility constraints.

Thanks!

[armanbilge]

May I have a question about when or what conditions are satisfied, then we could make improvements and break compatibility constraints.

When we are working on Cats Effect 4, which would be a major, breaking change. But there are no concrete plans for this at the moment. It would probably happen around the same time as Cats 3, which is also rather hypothetical.

• Cats 3 Roadmap cats#3757