Add AtomicMap
#4424
Add AtomicMap
#4424
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BalmungSan
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| // Provides common implementations for derived methods that depend on F being an applicative. | ||
| private[effect] sealed abstract class CommonImpl[F[_], A]( | ||
| implicit F: Applicative[F] | ||
| ) extends AtomicCell[F, A] { |
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Ideally, the implementations here would be part of the trait itself.
But since the trait doesn't know that there will be an Applicative[F] in scope, we can't provide them there.
Name suggestions are welcome :)
| /** | ||
| * Allows seeing a `AtomicCell[F, Option[A]]` as a `AtomicCell[F, A]`. This is useful not only | ||
| * for ergonomic reasons, but because some implementations may save space. | ||
| * | ||
| * Setting the `default` value is the same as storing a `None` in the underlying `AtomicCell`. | ||
| */ | ||
| def defaultedAtomicCell[F[_], A]( |
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Inspired by MapRef.defaultedRef
| ): AtomicCellOptionOps[F, A] = | ||
| new AtomicCellOptionOps(atomicCell) | ||
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| final class AtomicCellOptionOps[F[_], A] private[effect] ( |
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I am not sure how useful these extensions are, but it felt good to have them for completeness of the API.
| new AtomicCell.ConcurrentImpl( | ||
| ref = valuesMapRef(key), | ||
| lock = keyedMutex.lock(key) | ||
| ) |
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We get the implementation by free thanks to the shapes of KeyedMutex and MapRef.
And, since the default implementation for the MapRef when F is actually a Sync uses a ConcurrentHashMap, this should be pretty efficient under the hood.
| implicit F: Applicative[F] | ||
| ) extends AtomicMap[F, K, V] { | ||
| override def apply(key: K): AtomicCell[F, V] = | ||
| AtomicCell.defaultedAtomicCell(atomicCell = atomicMap(key), default) |
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Also delegates to the AtomicCell implementation.
| ): AtomicMapOptionOps[F, K, V] = | ||
| new AtomicMapOptionOps(atomicMap) | ||
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| final class AtomicMapOptionOps[F[_], K, V] private[effect] ( |
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The delegation here requires a little bit more boilerplate.
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BalmungSan
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Co-authored-by: Yannick Heiber <yhe@famly.co>
BalmungSan
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| // #4424, false warnings in CommonImpl due to lightbend-labs/mima#211 | ||
| ProblemFilters.exclude[DirectAbstractMethodProblem]( | ||
| "cats.effect.std.AtomicCell.modify"), | ||
| ProblemFilters.exclude[DirectAbstractMethodProblem]( | ||
| "cats.effect.std.AtomicCell.evalUpdate"), | ||
| ProblemFilters.exclude[DirectAbstractMethodProblem]( | ||
| "cats.effect.std.AtomicCell.evalGetAndUpdate"), | ||
| ProblemFilters.exclude[DirectAbstractMethodProblem]( | ||
| "cats.effect.std.AtomicCell.evalUpdateAndGet") |
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If lightbend-labs/mima#211 is ever fixed we should revert these.
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On top of #4065
Provides a parallel of
MapRefforAtomicCell, theAtomicMap.It also includes some nice improvements for
AtomicCell, we may move these to its own PR if you prefer.