Struct WatchEvent 

pub struct WatchEvent {
    pub event_type: WatchEventType,
    pub key: Bytes,
    pub value: Bytes,
    pub prev_value: Option<Bytes>,
    pub revision: u64,
}

Watch event types and handles — available when the watch feature is enabled.

Use these when implementing embedded watch handlers:

use d_engine::{WatchEventType, WatcherHandle, WatchEvent};

Opaque watch event delivered to callers.

All fields use standard Rust types — callers never need to import proto types.

prev_value semantics:

• None — watcher was registered with prev_kv = false, or the event is Progress / Canceled (not a data mutation).
• Some(Bytes::new()) — watcher has prev_kv = true and the key did not exist before this write (fresh insert).
• Some(v) — watcher has prev_kv = true and v is the previous value.

Fields

event_type: WatchEventType

key: Bytes

value: Bytes

prev_value: Option<Bytes>

revision: u64

Trait Implementations

impl Clone for WatchEvent

fn clone(&self) -> WatchEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WatchEvent

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

Formats the value using the given formatter.