Future

Unlike scala.concurrent.Future, this Future is not memorized by default.

var count = 0
val notMemorized = Future.delay {
  count += 1
}
count should be(0)
for {
  _ <- notMemorized
  _ = count should be(1)
  _ <- notMemorized
  _ = count should be(2)
  _ <- notMemorized
} yield (count should be(3))

A Future can be memorized manually by converting this Future to a scala.concurrent.Future and then converting back,

var count = 0
val notMemorized = Future.delay {
  count += 1
}
val memorized = notMemorized.toScalaFuture.toThoughtworksFuture
for {
  _ <- memorized
  _ = count should be(1)
  _ <- memorized
  _ = count should be(1)
  _ <- memorized
} yield (count should be(1))