ZIO learning - using cached with renew automatically / published by https://github.com/dacr/code-examples-manager #85442628-9054-4125-8aab-93057e8ef275/bd13cb78684ab5b5f655fa60dadaff50bc539a79

zio-learning-30-cached-3-renew.sc

// summary : ZIO learning - using cached with renew automatically
// keywords : scala, cached, ttl, zio, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : 85442628-9054-4125-8aab-93057e8ef275
// created-on : 2022-01-26T17:58:13+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 {

  case class AuthToken(token: String) {
    override def toString: String = token
  }
  object AuthToken                    {
    def apply(): AuthToken = AuthToken(java.util.UUID.randomUUID().toString)
  }

  val run = for {
    ref                  <- Ref.make(AuthToken())
    getAndRenew           = ref.modify(n => (n, AuthToken()))
    cachedInvalidator    <- getAndRenew.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("\n"))
  } yield ()

}

Encapsulated.main(Array.empty)