ZIO learning - operations timeout with fibonacci compute / published by https://github.com/dacr/code-examples-manager #e30c9102-80ff-449f-8c47-8e6ba7e82ca1/c3af4ad8ca450f3604bedea8bf301c03a9c79915

zio-learning-7-concurrency-4-timeout.sc

// summary : ZIO learning - operations timeout with fibonacci compute
// keywords : scala, zio, learning, pure-functional, fibonacci
// publish : gist
// authors : David Crosson
// license : Apache License Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt)
// id : e30c9102-80ff-449f-8c47-8e6ba7e82ca1
// created-on : 2021-04-06T12:48:09+02:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala "3.4.2"
//> using dep "dev.zio::zio:2.0.13"
//> using dep "fr.janalyse::zio-worksheet:2.0.13.0"
// ---------------------

/*
 inspired from
   - [John A De Goes - ZIO: Next-Generation Effects in Scala](https://www.youtube.com/watch?v=mkSHhsJXjdc)
   - +31:15
 with fixes due to API changes
 ------
 interesting content also here : https://gist.github.com/jdegoes/a799c7365d877da1face69dd139466de
 */

import zio.*, zio.worksheet.*
import zio.Duration.*

def fib(n: BigInt): UIO[BigInt] = {
  if (n <= 1) ZIO.succeed(n)
  //else fib(n-2).zipWithPar(fib(n-1))(_ + _) // TODO - some memory issue here => to be continued... linked with too many fibers I guess...
  else fib(n - 2).zipWith(fib(n - 1))(_ + _)
}

val maybeBigFib = fib(40).timeout(10.seconds)
//val maybeBigFib = fib(50).timeout(5.minutes)
//val maybeBigFib = fib(100_000).timeout(5.minutes)

// -------------------------------------------------------------
val result = maybeBigFib.unsafeRun
println(result)