Struct MvccVersionChain

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pub struct MvccVersionChain { /* private fields */ }

Expand description

Version chain for a key

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impl MvccVersionChain

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pub fn add(&mut self, version: MvccVersion)

Add a new version

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pub fn get_visible( &self, snapshot_ts: u64, txn_id: u64, committed: &DashMap<u64, u64>, ) -> Option<&Vec<u8>>

Get visible version for snapshot Uses DashMap for committed transaction lookup (lock-free read)

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pub fn get_visible_legacy( &self, snapshot_ts: u64, txn_id: u64, committed: &HashMap<u64, u64>, ) -> Option<&Vec<u8>>

Get visible version for snapshot (legacy HashMap version for compatibility)

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pub fn delete(&mut self, xmax: u64, deleted_ts: u64) -> bool

Mark latest version as deleted

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pub fn gc(&mut self, min_visible_ts: u64) -> usize

Garbage collect old versions

Trait Implementations§

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impl Debug for MvccVersionChain

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl Default for MvccVersionChain

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fn default() -> MvccVersionChain

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl UnwindSafe for MvccVersionChain

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impl<T> Allocation for T
where T: RefUnwindSafe + Send + Sync,

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<ST, DT> CastableFrom<ST, Initialized, Initialized> for DT
where ST: ?Sized, DT: ?Sized,

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impl<ST, DT> CastableFrom<ST, Uninit, Uninit> for DT
where ST: ?Sized, DT: ?Sized,

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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