Struct InMemoryResultBackend 

pub struct InMemoryResultBackend { /* private fields */ }

A fully in-memory implementation of the ResultStore trait.

All results are stored in process behind a tokio::sync::Mutex. The backend implements the complete ResultStore contract — store_result, get_result, get_state, forget, and has_result — and additionally provides native support for the optional tombstone hooks so that a forgotten result can be distinguished from one that never existed.

The backend is cheap to Clone; clones share the same underlying storage.

Implementations

impl InMemoryResultBackend

pub fn new() -> Self

Create a new, empty in-memory result backend.

pub async fn len(&self) -> usize

Number of live (non-forgotten) results currently stored.

pub async fn is_empty(&self) -> bool

Returns true if no live results are stored.

pub async fn clear(&self)

Remove all results and tombstones. Mainly intended for tests.

Trait Implementations

impl Debug for InMemoryResultBackend

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

Formats the value using the given formatter.

impl Default for InMemoryResultBackend

fn default() -> Self

Returns the “default value” for a type.

impl ResultStore for InMemoryResultBackend

fn store_result<'life0, 'async_trait>( &'life0 self, task_id: TaskId, result: TaskResultValue, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

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

Store a task result

fn get_result<'life0, 'async_trait>( &'life0 self, task_id: TaskId, ) -> Pin<Box<dyn Future<Output = Result<Option<TaskResultValue>>> + Send + 'async_trait>>

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

Retrieve a task result

fn get_state<'life0, 'async_trait>( &'life0 self, task_id: TaskId, ) -> Pin<Box<dyn Future<Output = Result<TaskState>> + Send + 'async_trait>>

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

Get task state

fn forget<'life0, 'async_trait>( &'life0 self, task_id: TaskId, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

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

Delete a task result

fn has_result<'life0, 'async_trait>( &'life0 self, task_id: TaskId, ) -> Pin<Box<dyn Future<Output = Result<bool>> + Send + 'async_trait>>

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

Check if a result exists

fn store_tombstone<'life0, 'async_trait>( &'life0 self, tombstone: ResultTombstone, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

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

Record a tombstone marking a result as explicitly deleted/forgotten.

fn get_tombstone<'life0, 'async_trait>( &'life0 self, task_id: TaskId, ) -> Pin<Box<dyn Future<Output = Result<Option<ResultTombstone>>> + Send + 'async_trait>>

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

Fetch the tombstone marker for a task, if one was recorded.

fn has_tombstone<'life0, 'async_trait>( &'life0 self, task_id: TaskId, ) -> Pin<Box<dyn Future<Output = Result<bool>> + Send + 'async_trait>>

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

Returns true if a tombstone marker is recorded for the task.

fn result_existence<'life0, 'async_trait>( &'life0 self, task_id: TaskId, ) -> Pin<Box<dyn Future<Output = Result<ResultExistence>> + Send + 'async_trait>>

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

Resolve the tri-state existence of a result: present, tombstoned (explicitly deleted), or absent (never existed).

fn forget_with_tombstone<'life0, 'async_trait>( &'life0 self, tombstone: ResultTombstone, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

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

Forget a result and simultaneously record a tombstone for it.

fn result_ttl_for<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, config: &'life1 ResultTtlConfig, task_name: &'life2 str, ) -> Pin<Box<dyn Future<Output = Result<Option<Duration>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Query the effective result TTL for a task type, given a per-task-type TTL configuration.

fn apply_result_ttl<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _task_id: TaskId, _config: &'life1 ResultTtlConfig, _task_name: &'life2 str, ) -> Pin<Box<dyn Future<Output = Result<bool>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Apply a per-task-type TTL to an already-stored result.