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Add updateLocally & updateSomeLocally #5030

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Merged
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Apr 30, 2021
Merged

Add updateLocally & updateSomeLocally #5030

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25 changes: 25 additions & 0 deletions core/shared/src/main/scala/zio/FiberRef.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,31 @@ final class FiberRef[A] private[zio] (
(result, result)
}

/**
* Returns an `IO` that runs with result of calling the specified function
* bound to the current fiber.
*
* Guarantees that fiber data is properly restored via `bracket`.
*/
def updateLocally[R, E, B](f: A => A)(use: ZIO[R, E, B]): ZIO[R, E, B] =
for {
oldValue <- get
b <- set(f(oldValue)).bracket_(set(oldValue))(use)
} yield b

/**
* Returns an `IO` that runs with result of calling the specified partial
* function bound to the current fiber.
*
* Guarantees that fiber data is properly restored via `bracket`.
*/
def updateSomeLocally[R, E, B](pf: PartialFunction[A, A])(use: ZIO[R, E, B]): ZIO[R, E, B] =
for {
oldValue <- get
value = pf.applyOrElse[A, A](oldValue, identity)
b <- set(value).bracket_(set(oldValue))(use)
} yield b

/**
* Atomically modifies the `FiberRef` with the specified partial function.
* If the function is undefined on the current value it doesn't change it.
Expand Down