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package org.example.ktz.blog | |
import cats.syntax.all._ | |
import cats.instances.future._ | |
import org.scalatest._ | |
import scala.concurrent.ExecutionContext.Implicits.global | |
import scala.concurrent.duration._ | |
import scala.concurrent.{Await, Future} | |
class CartesianProductTest extends FlatSpec with Matchers { | |
def futureLong(): Future[Long] = Future { | |
Thread.sleep(2000) | |
println("Future Long Done!") | |
2 | |
} | |
def futureInt(long: Long): Future[Int] = Future{ | |
Thread.sleep(2000) | |
println("Future Int Done!") | |
long.toInt | |
} | |
def futureChar(long: Long): Future[Char] = Future{ | |
Thread.sleep(2000) | |
println("Future Char Done!") | |
long.toChar | |
} | |
"Concurrent" should "for comprehension" in { | |
val forComp: (Int, Char) = Await.result(for { | |
long <- futureLong() | |
int <- futureInt(long) | |
char <- futureChar(long) | |
} yield (int, char), 5 second) | |
// java.util.concurrent.TimeoutException: Futures timed out after [5 seconds] | |
} | |
"Concurrent" should "for comprehension2" in { | |
val longVal: Future[Long] = futureLong() | |
val intVal: Future[Int] = for { | |
long <- futureLong() | |
int <- futureInt(long) | |
} yield int | |
val charVal: Future[Char] = for { | |
long <- futureLong() | |
char <- futureChar(long) | |
} yield char | |
val forComp: (Int, Char) = Await.result(for { | |
int <- intVal | |
char <- charVal | |
} yield (int, char), 5 second) | |
// Work well :) | |
} | |
"Concurrent" should "cartesian" in { | |
val cartesion: (Int, Char) = Await.result(for { | |
long <- futureLong() | |
(int, char) <- (futureInt(long) |@| futureChar(long)).tupled | |
} yield (int, char), 5 second) | |
// Work well :) | |
} | |
} |
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