ZIO learning - using cached ttl and explicit invalidation / published by https://github.com/dacr/code-examples-manager #ebd2b441-6aa0-488e-ab6a-97c2cbe15b8f/b88112dad1ea2cae4f3851099ce8189b6572fda6

zio-learning-30-cached-2-ttl-invalidate.sc

// summary : ZIO learning - using cached ttl and explicit invalidation
// keywords : scala, cached, ttl, zio, invalidate, @testable
// publish : gist
// authors : David Crosson
// license : Apache License Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt)
// id : ebd2b441-6aa0-488e-ab6a-97c2cbe15b8f
// created-on : 2022-01-26T17:27:49+01:00
// 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"
// ---------------------

import zio.*

object Encapsulated extends ZIOAppDefault {
  val run = for {
    ref                  <- Ref.make(0)
    getAndIncrement       = ref.modify(n => (n, n + 1))
    cachedInvalidator    <- getAndIncrement.cachedInvalidate(2.seconds)
    (cached, invalidator) = cachedInvalidator
    a1                   <- cached
    a2                   <- cached
    _                    <- invalidator // Enough to invalidate !
    a3                   <- cached
    a4                   <- cached
    _                    <- Clock.sleep(2100.millis)
    a5                   <- cached
    a6                   <- cached
    _                    <- Console.printLine(List(a1, a2, a3, a4, a5, a6).mkString("-"))
  } yield ()
}

Encapsulated.main(Array.empty)