Struct Lww 

pub struct Lww<T> { /* private fields */ }

A causal last-writer-wins register that never uses wall-clock time.

Implementations

impl<T> Lww<T>

pub const fn new() -> Lww<T>

Constructs an empty register.

pub fn get(&self) -> Option<&T>

Returns the current value, if assigned.

pub fn dot(&self) -> Option<Dot>

Returns the database-issued identity of the visible assignment.

pub fn context(&self) -> Option<&VersionVector>

Returns the dependency-derived context of the visible assignment.

impl<T> Lww<T>

where T: Clone + Eq,

pub fn assign( &mut self, value: T, dot: Dot, context: VersionVector, ) -> Result<(), CrdtError>

Applies an assignment using causal order, then dot order for concurrency.

pub fn merge(&mut self, other: &Lww<T>) -> Result<(), CrdtError>

Deterministically combines another replica’s state.

pub fn canonicalize_for_commit( &self, author: AuthorId, sequence: u64, context: &VersionVector, next_operation: &mut u32, ) -> Result<Lww<T>, CrdtError>

Reissues causal metadata from an authenticated commit while preserving the value.

Trait Implementations

impl<T> Clone for Lww<T>

where T: Clone,

fn clone(&self) -> Lww<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T> Debug for Lww<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<'bytes, Ctx, T> Decode<'bytes, Ctx> for Lww<T>

where T: Decode<'bytes, Ctx>,

fn decode( __d777: &mut Decoder<'bytes>, __ctx777: &mut Ctx, ) -> Result<Lww<T>, Error>

Decode a value using the given Decoder.

fn nil() -> Option<Self>

If possible, return a nil value of Self.

impl<T> Default for Lww<T>

fn default() -> Lww<T>

Returns the “default value” for a type.

impl<Ctx, T> Encode<Ctx> for Lww<T>

where T: Encode<Ctx>,

fn encode<__W777>( &self, __e777: &mut Encoder<__W777>, __ctx777: &mut Ctx, ) -> Result<(), Error<<__W777 as Write>::Error>>

where __W777: Write,

Encode a value of this type using the given Encoder.

fn is_nil(&self) -> bool

Is this value of Self a nil value?

impl<T> FieldState for Lww<T>

where T: Clone + Eq + Encode<()> + for<'bytes> Decode<'bytes, ()>,

const CRDT_KIND: CrdtKind = CrdtKind::Lww

The deterministic merge strategy.

type Value = T

The application value carried by this field strategy.

fn encode_state(&self) -> Result<Vec<u8>, RecordError>

Encodes complete causal field state.

fn decode_state(bytes: &[u8]) -> Result<Lww<T>, RecordError>

Strictly decodes complete causal field state.

fn visible_values(&self) -> Result<Vec<Vec<u8>>, RecordError>

Encodes each currently visible application value for filtering and indexes.

fn merge_state(&mut self, other: &Lww<T>) -> Result<(), RecordError>

Deterministically merges complete causal state from another replica.

fn canonicalize_for_commit( &self, author: AuthorId, sequence: u64, context: &VersionVector, next_operation: &mut u32, ) -> Result<Lww<T>, RecordError>

Reissues all causal identities from one authenticated commit envelope.

fn value_type_name() -> &'static str

Stable Rust logical value type used in schema compatibility checks.

impl<T> Merge for Lww<T>

where T: Clone + Eq,

fn merge(&mut self, other: &Lww<T>) -> Result<(), CrdtError>

Merges other into this value.

impl<T> PartialEq for Lww<T>

where T: PartialEq,

fn eq(&self, other: &Lww<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> Eq for Lww<T>

where T: Eq,

impl<T> StructuralPartialEq for Lww<T>