Struct NoHook 

pub struct NoHook;

Default no-op hook. All branches are eliminated at compile time.

Trait Implementations

impl<K: Key, T> TypedWriteHook<K, T> for NoHook

Available on crate feature typed-tree only.

const NEEDS_OLD_VALUE: bool = false

Unused for TypedTree/TypedMap/ZeroTree/ZeroMap — old value is always provided (it lives in memory). Kept for trait uniformity with WriteHook.

const NEEDS_INIT: bool = false

const NEEDS_WRITE: bool = false

const PROJECTS: bool = false

const COUNTS: bool = false

Whether this hook maintains engine counters. Compile-time, so an uncounted collection’s write path is unchanged.

const CLAIMS: bool = false

Whether this hook declares claims into a unique namespace (T10). Compile-time, so an unclaimed collection’s write path is unchanged.

fn on_write(&self, _key: &K, _old: Option<&T>, _new: Option<&T>)

fn on_init(&self, _key: &K, _value: &T)

See WriteHook::on_init for reentrancy guarantees.

fn project( &self, _key: &K, _value: &T, _sink: &mut ProjectionSink<'_>, ) -> DbResult<()>

const WATCHES: bool = false

fn watch_channel(&self) -> Option<&Arc<WatchChannel<K>>>

fn watch_old(&self) -> bool

const EXPIRES: bool = false

const TTL_REVISION: u32 = 0

fn deadline(&self, _key: &K, _value: &T) -> Option<u64>

fn projection_targets(&self) -> Option<&IndexTargets>

fn projection_limits(&self) -> (usize, usize)

fn counter_project( &self, _key: &K, _value: &T, _sink: &mut CounterSink<'_>, ) -> DbResult<()>

fn counter_targets(&self) -> Option<&CounterTargets>

fn claim_project( &self, _key: &K, _value: &T, _sink: &mut ClaimSink<'_>, ) -> DbResult<()>

fn claim_targets(&self) -> Option<&UniqueTargets>

const EMITS: bool = false

fn stream_project( &self, _key: &K, _old: Option<&T>, _new: Option<&T>, _sink: &mut EmitSink<'_>, ) -> DbResult<()>

fn stream_targets(&self) -> Option<&QueueTargets>

impl<K: Key> WriteHook<K> for NoHook

const NEEDS_OLD_VALUE: bool = false

const NEEDS_INIT: bool = false

const NEEDS_WRITE: bool = false

const PROJECTS: bool = false

const COUNTS: bool = false

Whether this hook maintains engine counters. Compile-time, so an uncounted collection’s write path is unchanged.

const CLAIMS: bool = false

Whether this hook declares claims into a unique namespace (T10). Compile-time, so an unclaimed collection’s write path is unchanged.

const EMITS: bool = false

fn on_write(&self, _key: &K, _old: Option<&[u8]>, _new: Option<&[u8]>)

Called after a successful write operation.

fn on_init(&self, _key: &K, _value: &[u8])

Called once per live entry during collection open. Fires after recovery and migration are complete, with the final value.

fn project( &self, _key: &K, _old: Option<&[u8]>, _new: Option<&[u8]>, _sink: &mut ProjectionSink<'_>, ) -> DbResult<()>

const WATCHES: bool = false

fn watch_channel(&self) -> Option<&Arc<WatchChannel<K>>>

fn watch_old(&self) -> bool

Whether the watch carrier requests the previous value in published events. Kept separate from NEEDS_OLD_VALUE, which may be true only for an unrelated write hook.

const EXPIRES: bool = false

const TTL_REVISION: u32 = 0

fn deadline(&self, _key: &K, _value: &[u8]) -> Option<u64>

fn ttl_decode_failed(&self, _value: &[u8]) -> bool

True when value bytes cannot be decoded for TTL stage-2 (Var families). Distinguishes decode errors from a None policy deadline.

fn projection_targets(&self) -> Option<&IndexTargets>

fn projection_limits(&self) -> (usize, usize)

fn counter_project( &self, _key: &K, _old: Option<&[u8]>, _new: Option<&[u8]>, _sink: &mut CounterSink<'_>, ) -> DbResult<()>

Byte-snapshot counter projection — mirrors WriteHook::project’s shape (key, old snapshot, new snapshot, sink).

fn counter_targets(&self) -> Option<&CounterTargets>

fn claim_project( &self, _key: &K, _old: Option<&[u8]>, _new: Option<&[u8]>, _sink: &mut ClaimSink<'_>, ) -> DbResult<()>

Byte-snapshot claim projection — mirrors WriteHook::project’s shape.

fn claim_targets(&self) -> Option<&UniqueTargets>

fn stream_project( &self, _key: &K, _old: Option<&[u8]>, _new: Option<&[u8]>, _sink: &mut EmitSink<'_>, ) -> DbResult<()>

fn stream_targets(&self) -> Option<&QueueTargets>