Using Cats bracket for resource handling.

CatsEffectBracket.scala

package com.sebastianvoss

import java.util.UUID

import cats.effect.{Bracket, IO}

object CatsEffectBracket extends App {

  case class SomeResource(id: UUID)

  val aquire = IO {
    println("Acquiring resource")
    SomeResource(UUID.randomUUID())
  }

  val doStuff: SomeResource => IO[String] = resource =>
    IO {
      println(s"Doing stuff with $resource")
      throw new Exception("Bad thing")
      //"Some result"
  }

  val release: SomeResource => IO[Unit] = resource => IO(println(s"Closing $resource"))

  val p = Bracket[IO, Throwable].bracket(aquire)(doStuff)(release)

  p.unsafeRunSync()

}