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Backport ZPool from ZIO 2 #6265

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Merged
merged 3 commits into from
Jan 19, 2022
Merged

Backport ZPool from ZIO 2 #6265

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13e9e01
Backport `ZPool` from ZIO 2
guizmaii Jan 19, 2022
f79b184
Clean
guizmaii Jan 19, 2022
cc977a3
Clean
guizmaii Jan 19, 2022
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122 changes: 122 additions & 0 deletions core-tests/shared/src/test/scala/zio/ZPoolSpec.scala
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Original file line number Diff line number Diff line change
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package zio

import zio.test._
import zio.duration._
import zio.test.TestAspect.nonFlaky
import zio.test.environment.{Live, TestClock}

object ZPoolSpec extends ZIOBaseSpec {
def spec =
suite("ZPoolSpec") {
testM("preallocates pool items") {
for {
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1))(count.update(_ - 1))
reserve <- ZPool.make(get, 10).reserve
_ <- reserve.acquire
_ <- count.get.repeatUntil(_ == 10)
value <- count.get
} yield assertTrue(value == 10)
} +
testM("cleans up items when shut down") {
for {
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1))(count.update(_ - 1))
reserve <- ZPool.make(get, 10).reserve
_ <- reserve.acquire
_ <- count.get.repeatUntil(_ == 10)
_ <- reserve.release(Exit.succeed(()))
value <- count.get
} yield assertTrue(value == 0)
} +
testM("acquire one item") {
for {
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1))(count.update(_ - 1))
reserve <- ZPool.make(get, 10).reserve
pool <- reserve.acquire
_ <- count.get.repeatUntil(_ == 10)
item <- pool.get.use(ZIO.succeed(_))
} yield assertTrue(item == 1)
} +
testM("reports failures via get") {
for {
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1).flatMap(ZIO.fail(_)))(count.update(_ - 1))
reserve <- ZPool.make[Any, Int, String](get, 10).reserve
pool <- reserve.acquire
_ <- count.get.repeatUntil(_ == 10)
values <- ZIO.collectAll(List.fill(10)(pool.get.reserve.flatMap(_.acquire.flip)))
} yield assertTrue(values == List(1, 2, 3, 4, 5, 6, 7, 8, 9, 10))
} +
testM("blocks when item not available") {
for {
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1))(count.update(_ - 1))
reserve <- ZPool.make(get, 10).reserve
pool <- reserve.acquire
_ <- count.get.repeatUntil(_ == 10)
_ <- ZIO.collectAll(List.fill(10)(pool.get.reserve.flatMap(_.acquire)))
result <- Live.live(pool.get.use(_ => ZIO.unit).disconnect.timeout(1.millis))
} yield assertTrue(result == None)
} +
testM("reuse released items") {
for {
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1))(count.update(_ - 1))
reserve <- ZPool.make(get, 10).reserve
pool <- reserve.acquire
_ <- pool.get.use(_ => ZIO.unit).repeatN(99)
result <- count.get
} yield assertTrue(result == 10)
} +
testM("invalidate item") {
for {
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1))(count.update(_ - 1))
reserve <- ZPool.make(get, 10).reserve
pool <- reserve.acquire
_ <- count.get.repeatUntil(_ == 10)
_ <- pool.invalidate(1)
result <- pool.get.use(ZIO.succeed(_))
} yield assertTrue(result == 2)
} +
testM("compositional retry") {
def cond(i: Int) = if (i <= 10) ZIO.fail(i) else ZIO.succeed(i)
for {
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1).flatMap(cond(_)))(count.update(_ - 1))
reserve <- ZPool.make(get, 10).reserve
pool <- reserve.acquire
_ <- count.get.repeatUntil(_ == 10)
result <- pool.get.use(ZIO.succeed(_)).eventually
} yield assertTrue(result == 11)
} +
testM("max pool size") {
for {
promise <- Promise.make[Nothing, Unit]
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1))(count.update(_ - 1))
reserve <- ZPool.make(get, 10 to 15, 60.seconds).reserve
pool <- reserve.acquire
_ <- pool.get.use(_ => promise.await).fork.repeatN(14)
_ <- count.get.repeatUntil(_ == 15)
_ <- promise.succeed(())
max <- count.get
_ <- TestClock.adjust(60.seconds)
min <- count.get
} yield assertTrue(min == 10 && max == 15)
} +
testM("shutdown robustness") {
for {
count <- Ref.make(0)
get = ZManaged.make_(count.updateAndGet(_ + 1))(count.update(_ - 1))
reserve <- ZPool.make(get, 10).reserve
pool <- reserve.acquire
_ <- pool.get.use(ZIO.succeed(_)).fork.repeatN(99)
_ <- reserve.release(Exit.succeed(()))
result <- count.get
} yield assertTrue(result == 0)
} @@ nonFlaky
}
}
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