Struct TtlSet 

pub struct TtlSet { /* private fields */ }

Available on crate feature cache only.

A Send+Sync cache of string keys with bounded capacity and TTL expiry.

Designed for deduplication / idempotency workloads: the reserve method atomically inserts the key if absent, returning a Duplicate discriminator. No value type is associated with each key — only presence matters.

Backed by moka::sync::Cache internally; cloning shares the same underlying storage thanks to moka’s internal Arc.

Implementations

impl TtlSet

pub fn new(ttl: Duration, max_capacity: u64) -> Self

Constructs a cache with the given TTL and maximum capacity.

pub fn reserve(&self, key: impl Into<String>) -> Duplicate

Reserves a key: returns Duplicate::No if newly inserted, Duplicate::Yes if already present.

This operation is lock-free and coalesces concurrent inserts of the same key (exactly one insertion wins; others observe Yes).

pub fn contains(&self, key: &str) -> bool

Returns true if key is currently present in the cache.

pub fn entry_count(&self) -> u64

Returns the approximate current entry count (used for observability).

Trait Implementations

impl Clone for TtlSet

fn clone(&self) -> TtlSet

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TtlSet

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

Formats the value using the given formatter.