Struct WeakIdentityMap 

pub struct WeakIdentityMap { /* private fields */ }

A weak-reference based identity map that allows objects to be garbage collected.

This variant uses Weak<RwLock<>> instead of Arc<RwLock<>>, allowing objects to be dropped when no external references remain. The map automatically cleans up stale entries on access.

Implementations

impl WeakIdentityMap

pub fn new() -> Self

Create a new empty weak identity map.

pub fn register<M: Model + 'static>( &mut self, arc: &Arc<RwLock<Box<dyn Any + Send + Sync>>>, pk_values: &[Value], )

Register an object in the weak identity map.

The map holds a weak reference; when all strong references are dropped, the object can be garbage collected.

pub fn get<M: Model + Clone + Send + Sync + 'static>( &self, pk_values: &[Value], ) -> Option<Arc<RwLock<Box<dyn Any + Send + Sync>>>>

Try to get an object from the weak map.

Returns None if the object was never registered or has been dropped.

pub fn prune(&mut self)

Remove stale (dropped) entries from the map.

Call this periodically to clean up memory.

pub fn clear(&mut self)

Clear all entries.

pub fn len(&self) -> usize

Get the number of entries (including potentially stale ones).

pub fn is_empty(&self) -> bool

Check if the map is empty.

Trait Implementations

impl Default for WeakIdentityMap

fn default() -> WeakIdentityMap

Returns the “default value” for a type.