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Implement Random.nextUUID #4828

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Merged
merged 2 commits into from
Mar 22, 2021
Merged

Implement Random.nextUUID #4828

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36a2cc3
implement Random.nextUUID
adamgfraser Mar 22, 2021
3797705
format
adamgfraser Mar 22, 2021
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5 changes: 5 additions & 0 deletions core-tests/shared/src/test/scala/zio/RandomSpec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,11 @@ object RandomSpec extends ZIOBaseSpec {
} yield assert(n)(isGreaterThanEqualTo(min)) &&
assert(n)(isLessThan(max))
}
},
testM("nextUUID generates universally unique identifiers") {
check(Gen.fromEffect(Live.live(random.nextUUID))) { uuid =>
assert(uuid.variant)(equalTo(2))
}
}
)

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18 changes: 18 additions & 0 deletions core/shared/src/main/scala/zio/random/package.scala
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@@ -1,5 +1,7 @@
package zio

import java.util.UUID

package object random {
type Random = Has[Random.Service]

Expand All @@ -20,6 +22,7 @@ package object random {
def nextLongBounded(n: Long): UIO[Long]
def nextPrintableChar: UIO[Char]
def nextString(length: Int): UIO[String]
def nextUUID: UIO[UUID] = nextUUIDWith(nextLong)
def setSeed(seed: Long): UIO[Unit]
def shuffle[A, Collection[+Element] <: Iterable[Element]](collection: Collection[A])(implicit
bf: BuildFrom[Collection[A], A, Collection[A]]
Expand Down Expand Up @@ -144,6 +147,15 @@ package object random {
}
}

private[zio] def nextUUIDWith(nextLong: UIO[Long]): UIO[UUID] =
for {
mostSigBits <- nextLong
leastSigBits <- nextLong
} yield new UUID(
(mostSigBits & ~0x0000f000) | 0x00004000,
(leastSigBits & ~(0xc0000000L << 32)) | (0x80000000L << 32)
)

private[zio] def shuffleWith[A, Collection[+Element] <: Iterable[Element]](
nextIntBounded: Int => UIO[Int],
collection: Collection[A]
Expand Down Expand Up @@ -247,6 +259,12 @@ package object random {
def nextLongBounded(n: => Long): URIO[Random, Long] =
ZIO.accessM(_.get.nextLongBounded(n))

/**
* Generates psuedo-random universally unique identifiers.
*/
val nextUUID: URIO[Random, UUID] =
ZIO.accessM(_.get.nextUUID)

/**
* Generates a pseudo-random character from the ASCII range 33-126.
*/
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3 changes: 0 additions & 3 deletions test-tests/shared/src/test/scala/zio/test/GenSpec.scala
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Expand Up @@ -341,9 +341,6 @@ object GenSpec extends ZIOBaseSpec {
testM("unit generates the constant unit value") {
checkSample(Gen.unit)(forall(equalTo(())))
},
testM("UUID generates random UUIDs") {
checkSample(Gen.anyUUID)(forall(equalTo(2)), _.map(_.variant))
},
testM("vectorOf generates sizes in range") {
checkSample(Gen.vectorOf(smallInt))(
forall(isGreaterThanEqualTo(0) && isLessThanEqualTo(100)),
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8 changes: 1 addition & 7 deletions test/shared/src/main/scala/zio/test/Gen.scala
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Expand Up @@ -283,13 +283,7 @@ object Gen extends GenZIO with FunctionVariants with TimeVariants {
* not have any shrinking.
*/
val anyUUID: Gen[Random, UUID] =
for {
mostSigBits <- Gen.anyLong.noShrink
leastSigBits <- Gen.anyLong.noShrink
} yield new UUID(
(mostSigBits & ~0x0000f000) | 0x00004000,
(leastSigBits & ~(0xc0000000L << 32)) | (0x80000000L << 32)
)
Gen.fromEffect(nextUUID)

/**
* A generator of big decimals inside the specified range: [start, end].
Expand Down