Struct Change 

#[non_exhaustive]
pub struct Change {
    pub offset: u64,
    pub argv: Vec<Vec<u8>>,
}

One mutation delivered by Store::changes_since.

use kevy_embedded::{Config, Store};

let store = Store::open(Config::default().with_feed(0))?;
let from = store.changes_tail()?;
store.set(b"k", b"v")?;
let batch = store.changes_since(from, 10, &[])?;
let change = &batch.changes[0];
assert_eq!(change.offset, from.offset);
assert_eq!(change.argv[0], b"SET");

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

offset: u64

Stream offset (monotonic within a generation).

use kevy_embedded::{Config, Store};

let store = Store::open(Config::default().with_feed(0))?;
let from = store.changes_tail()?;
store.set(b"a", b"1")?;
store.set(b"b", b"2")?;
let offsets: Vec<u64> = store.changes_since(from, 10, &[])?.changes.iter().map(|c| c.offset).collect();
assert_eq!(offsets, [from.offset, from.offset + 1]);

argv: Vec<Vec<u8>>

The applied effect’s argv (same frames the AOF / a replica sees).

use kevy_embedded::{Config, Store};

let store = Store::open(Config::default().with_feed(0))?;
let from = store.changes_tail()?;
store.hset(b"h", &[(b"f", b"v")])?;
let argv = &store.changes_since(from, 10, &[])?.changes[0].argv;
assert_eq!(argv, &[b"HSET".to_vec(), b"h".to_vec(), b"f".to_vec(), b"v".to_vec()]);

Implementations

impl Change

pub fn new(offset: u64, argv: Vec<Vec<u8>>) -> Self

A change at offset carrying argv — what a client decoding a server’s FEED.READ reply builds, so both backends hand back the same type.

let c = kevy_embedded::Change::new(7, vec![b"DEL".to_vec(), b"k".to_vec()]);
assert_eq!((c.offset, c.argv.len()), (7, 2));

Trait Implementations

impl Clone for Change

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Change

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

Formats the value using the given formatter.

impl Eq for Change

impl Hash for Change

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 PartialEq for Change

fn eq(&self, other: &Self) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Change