Struct SeenCache 

pub struct SeenCache<const N: usize> { /* private fields */ }

Fixed-size cache for duplicate detection

Uses a simple ring buffer with LRU eviction.

Implementations

impl<const N: usize> SeenCache<N>

pub fn new(lifetime: u32) -> Self

Create a new seen cache

Arguments

• lifetime - How many ticks before entries expire

pub fn tick(&mut self)

Advance the tick counter

pub fn is_duplicate(&self, message_id: u32) -> bool

Check if a message was recently seen

Returns true if the message is a duplicate (was seen before).

pub fn check_and_mark(&mut self, message_id: u32) -> bool

Check if duplicate and mark as seen if not

Returns true if the message is a duplicate. If not a duplicate, adds it to the cache.

pub fn mark_seen(&mut self, message_id: u32)

Mark a message as seen

pub fn clear(&mut self)

Clear all entries

pub fn len(&self) -> usize

Get number of valid (non-expired) entries

pub fn is_empty(&self) -> bool

Check if cache is empty