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cca0b6e81a
Mostly trying to avoid tricky `Arrows` syntax, and unnecessary use of the `Hasura.Incremental` framework. PR-URL: https://github.com/hasura/graphql-engine-mono/pull/6997 GitOrigin-RevId: 9a2f5883e7e29af164e1581049ae003afec2cbe4
50 lines
1.5 KiB
Haskell
50 lines
1.5 KiB
Haskell
-- | A simple implementation of /incremental build rules/, which can be used to avoid unnecessary
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-- recomputation on incrementally-changing input. See 'Rule' for more details.
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module Hasura.Incremental
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( -- * The @Rule@ datatype
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Rule,
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Result,
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build,
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rebuild,
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rebuildRule,
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result,
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-- * Abstract interface
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ArrowDistribute (..),
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ArrowCache (..),
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-- * Fine-grained dependencies
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Dependency,
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Select (Selector),
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selectD,
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selectKeyD,
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selectMaybeD,
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Accesses,
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-- * Cache invalidation
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InvalidationKey,
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initialInvalidationKey,
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invalidate,
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)
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where
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import Hasura.Incremental.Internal.Cache
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import Hasura.Incremental.Internal.Dependency
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import Hasura.Incremental.Internal.Rule
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import Hasura.Incremental.Select
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import Hasura.Prelude
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-- | A simple helper type that can be used to implement explicit cache invalidation. Internally,
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-- each 'InvalidationKey' is a counter; 'initialInvalidationKey' starts the counter at 0 and
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-- 'invalidate' increments it by 1. Two 'InvalidationKey's are equal iff they have the same internal
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-- count, so depending on an 'InvalidationKey' provides a mechanism to force portions of the build
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-- process to be reexecuted by calling 'invalidate' before running the build.
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newtype InvalidationKey = InvalidationKey Int
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deriving (Show, Eq, Ord)
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initialInvalidationKey :: InvalidationKey
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initialInvalidationKey = InvalidationKey 0
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invalidate :: InvalidationKey -> InvalidationKey
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invalidate (InvalidationKey n) = InvalidationKey (n + 1)
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