Struct Cursor 

pub struct Cursor<A, L> { /* private fields */ }

Cursor to track log heights (state vector).

It offers methods to “advance” a log and compute the difference to another state vector. A cursor can be used to manage a state vector over a topic (“log heights” of logs scoped by a topic).

Implementations

impl<A, L> Cursor<A, L>

where A: Author, L: LogId,

pub fn new(name: impl AsRef<str>, state: LogHeights<A, L>) -> Self

pub fn name(&self) -> &str

pub fn state(&self) -> &LogHeights<A, L>

Returns state vector.

pub fn log_height(&self, author: &A, log_id: &L) -> Option<&SeqNum>

Returns state vector for a specific log.

pub fn compare(&self, other: &LogHeights<A, L>) -> LogRanges<A, L>

Calculates the difference between two state vectors.

pub fn advance(&mut self, author: A, log_id: L, log_height: SeqNum)

Advances the state of a specific log.

Trait Implementations

impl<A: Clone, L: Clone> Clone for Cursor<A, L>

fn clone(&self) -> Cursor<A, L>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<A: Debug, L: Debug> Debug for Cursor<A, L>

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

Formats the value using the given formatter.

impl<'de, A, L> Deserialize<'de> for Cursor<A, L>

where A: Author, L: LogId,

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<A: Hash, L: Hash> Hash for Cursor<A, L>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<A: Ord, L: Ord> Ord for Cursor<A, L>

fn cmp(&self, other: &Cursor<A, L>) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<A: PartialEq, L: PartialEq> PartialEq for Cursor<A, L>

fn eq(&self, other: &Cursor<A, L>) -> 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<A: PartialOrd, L: PartialOrd> PartialOrd for Cursor<A, L>

fn partial_cmp(&self, other: &Cursor<A, L>) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<A, L> Serialize for Cursor<A, L>

where A: Author, L: LogId,

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<A: Eq, L: Eq> Eq for Cursor<A, L>

impl<A, L> StructuralPartialEq for Cursor<A, L>