Struct InMemoryCheckpointer 

pub struct InMemoryCheckpointer<S: GraphState + Clone> { /* private fields */ }

Stores (run_id, namespace, step) -> S in a Mutex-protected HashMap. State must be Clone because saving stores a clone and loading returns one.

Implementations

impl<S: GraphState + Clone> InMemoryCheckpointer<S>

pub fn new() -> Self

Empty checkpointer.

pub fn with_namespace(self, ns: impl Into<String>) -> Self

Set the namespace for subgraph isolation. Operations on this instance scope to (run_id, namespace, step).

Trait Implementations

impl<S: GraphState + Clone> Checkpointer<S> for InMemoryCheckpointer<S>

fn save<'life0, 'life1, 'async_trait>( &'life0 self, run_id: Uuid, step: u64, state: &'life1 S, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Save state at step for run_id.

fn load<'life0, 'async_trait>( &'life0 self, run_id: Uuid, step: Option<u64>, ) -> Pin<Box<dyn Future<Output = Result<Option<S>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Load state for run_id at step (or the latest if step is None).

fn list<'life0, 'async_trait>( &'life0 self, run_id: Uuid, ) -> Pin<Box<dyn Future<Output = Result<Vec<u64>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

List all saved step numbers for run_id.

fn save_active<'life0, 'life1, 'async_trait>( &'life0 self, run_id: Uuid, step: u64, active: &'life1 [ActiveSnapshot], ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Save the engine’s active task snapshot alongside state. Default is no-op — older checkpointers won’t persist the active set, and engine::resume falls back to the start node when load_active returns empty.

fn load_active<'life0, 'async_trait>( &'life0 self, run_id: Uuid, step: u64, ) -> Pin<Box<dyn Future<Output = Result<Vec<ActiveSnapshot>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Load the active task snapshot for (run_id, step). Default is empty.

impl<S: GraphState + Clone> Default for InMemoryCheckpointer<S>

fn default() -> Self

Returns the “default value” for a type.