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Implemented lens-like ZRef focusing on state components #3257

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Implemented lens-like ZRef focusing on state components #3257

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146 changes: 146 additions & 0 deletions core-tests/shared/src/test/scala/zio/ZRefSpec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -267,6 +267,147 @@ object ZRefSpec extends ZIOBaseSpec {
value <- ref.get
} yield assert(value)(equalTo(update))
}
),
suite("Focused")(
testM("atomicity") {
for {
ref <- Focused.make(0, 1)
_ <- ZIO.collectAllPar(ZIO.replicate(100)(ref.update(_ + 1)))
value <- ref.get
} yield assert(value)(equalTo(100))
},
testM("get") {
for {
ref <- Focused.make(current, 1)
value <- ref.get
} yield assert(value)(equalTo(current))
},
testM("getAndSet") {
for {
ref <- Focused.make(current, 1)
value1 <- ref.getAndSet(update)
value2 <- ref.get
} yield assert(value1)(equalTo(current)) && assert(value2)(equalTo(update))
},
testM("getAndUpdate") {
for {
ref <- Focused.make(current, 1)
value1 <- ref.getAndUpdate(_ => update)
value2 <- ref.get
} yield assert(value1)(equalTo(current)) && assert(value2)(equalTo(update))
},
testM("getAndUpdateSome") {
for {
ref <- Focused.make[State, Int](Active, 1)
value1 <- ref.getAndUpdateSome { case Closed => Changed }
value2 <- ref.get
} yield assert(value1)(equalTo(Active)) && assert(value2)(equalTo(Active))
},
testM("getAndUpdateSome twice") {
for {
ref <- Focused.make[State, Int](Active, 1)
value1 <- ref.getAndUpdateSome { case Active => Changed }
value2 <- ref.getAndUpdateSome {
case Active => Changed
case Changed => Closed
}
value3 <- ref.get
} yield assert(value1)(equalTo(Active)) && assert(value2)(equalTo(Changed)) && assert(value3)(equalTo(Closed))
},
testM("modify") {
for {
ref <- Focused.make(current, 1)
r <- ref.modify(_ => ("hello", update))
value <- ref.get
} yield assert(r)(equalTo("hello")) && assert(value)(equalTo(update))
},
testM("modifySome") {
for {
ref <- Focused.make[State, Int](Active, 1)
value <- ref.modifySome("State doesn't change") { case Closed => ("active", Active) }
} yield assert(value)(equalTo("State doesn't change"))
},
testM("modifySome twice") {
for {
ref <- Focused.make[State, Int](Active, 1)
value1 <- ref.modifySome("doesn't change the state") { case Active => ("changed", Changed) }
value2 <- ref.modifySome("doesn't change the state") {
case Active => ("changed", Changed)
case Changed => ("closed", Closed)
}
} yield assert(value1)(equalTo("changed")) && assert(value2)(equalTo("closed"))
},
testM("readOnly") {
for {
ref <- Focused.make(current, 1)
readOnly = ref.readOnly
_ <- ref.set(update)
value <- readOnly.get
} yield assert(value)(equalTo(update))
},
testM("set") {
for {
ref <- Focused.make(current, 1)
_ <- ref.set(update)
value <- ref.get
} yield assert(value)(equalTo(update))
},
testM("update") {
for {
ref <- Focused.make(current, 1)
_ <- ref.update(_ => update)
value <- ref.get
} yield assert(value)(equalTo(update))
},
testM("updateAndGet") {
for {
ref <- Focused.make(current, 1)
value <- ref.updateAndGet(_ => update)
} yield assert(value)(equalTo(update))
},
testM("updateSome") {
for {
ref <- Focused.make[State, Int](Active, 1)
_ <- ref.updateSome { case Closed => Changed }
value <- ref.get
} yield assert(value)(equalTo(Active))
},
testM("updateSome twice") {
for {
ref <- Focused.make[State, Int](Active, 1)
_ <- ref.updateSome { case Active => Changed }
value1 <- ref.get
_ <- ref.updateSomeAndGet {
case Active => Changed
case Changed => Closed
}
value2 <- ref.get
} yield assert(value1)(equalTo(Changed)) && assert(value2)(equalTo(Closed))
},
testM("updateSomeAndGet") {
for {
ref <- Focused.make[State, Int](Active, 1)
value <- ref.updateSomeAndGet { case Closed => Changed }
} yield assert(value)(equalTo(Active))
},
testM("updateSomeAndGet twice") {
for {
ref <- Focused.make[State, Int](Active, 1)
value1 <- ref.updateSomeAndGet { case Active => Changed }
value2 <- ref.updateSomeAndGet {
case Active => Changed
case Changed => Closed
}
} yield assert(value1)(equalTo(Changed)) && assert(value2)(equalTo(Closed))
},
testM("writeOnly") {
for {
ref <- Focused.make(current, 1)
writeOnly = ref.writeOnly
_ <- writeOnly.set(update)
value <- ref.get
} yield assert(value)(equalTo(update))
}
)
)

Expand All @@ -282,4 +423,9 @@ object ZRefSpec extends ZIOBaseSpec {
Ref.make(a).map(ref => ref.unifyError(identity, identity).unifyValue(identity, identity))
}

object Focused {
def make[A, B](a: A, b: B): UIO[Ref[A]] =
Ref.make((a, b)).map(ref => ref.focus(_._1) { case ((_, b), a) => (a, b) })
}

}
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