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55 lines
1.6 KiB
Haskell
55 lines
1.6 KiB
Haskell
module Hasura.CacheBoundedSpec (spec) where
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import Hasura.Prelude
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import qualified Hasura.Cache.Bounded as Cache
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import Test.Hspec
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spec :: Spec
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spec = describe "Bounded cache data structure" $ do
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-- assume a single stripe here for simplicity:
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let checkEntries c expected = do
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Cache.checkInvariants c
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Cache.getEntriesRecency c >>= \case
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[es] -> do
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sort es `shouldBe` expected
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_ -> error "stripes wrong"
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it "works for 0 size" $ do
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c <- Cache.initialiseStripes 1 0
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Cache.lookup 'X' c `shouldReturn` Nothing
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Cache.insert 'Y' 'Y' c
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Cache.lookup 'Y' c `shouldReturn` Nothing
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checkEntries c []
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-- basic functionality check:
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it "seems to be working right" $ do
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c <- Cache.initialiseStripes 1 3
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Cache.insert 'A' 'A' c
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checkEntries c [('A', 0, 'A')]
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-- lookups of non-existing keys don't increment the ticket (though it
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-- wouldn't hurt if it did):
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Cache.lookup 'X' c `shouldReturn` Nothing
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Cache.lookup 'A' c `shouldReturn` Just 'A'
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checkEntries c [('A', 1, 'A')]
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Cache.insert 'B' 'B' c
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checkEntries c [('A', 1, 'A'), ('B', 2, 'B')]
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Cache.lookup 'B' c `shouldReturn` Just 'B'
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checkEntries c [('A', 1, 'A'), ('B', 3, 'B')]
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Cache.lookup 'A' c `shouldReturn` Just 'A'
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checkEntries c [('A', 4, 'A'), ('B', 3, 'B')]
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Cache.insert 'C' 'C' c
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checkEntries c [('A', 4, 'A'), ('B', 3, 'B'), ('C', 5, 'C')]
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-- evict 'B':
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Cache.insert 'D' 'D' c
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checkEntries c [('A', 4, 'A'), ('C', 5, 'C'), ('D', 6, 'D')]
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Cache.lookup 'B' c `shouldReturn` Nothing
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