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EngineHandle

oxios_kernel::engine

Struct EngineHandle 

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pub struct EngineHandle { /* private fields */ }
Expand description

Shared, hot-swappable reference to the active OxiosEngine.

Wraps RwLock<Arc<OxiosEngine>> so that:

  • Writers (EngineApi) can atomically replace the engine on config change
  • Readers (AgentRuntime) always get the current engine at execution time

§Cost

Rebuilding OxiosEngine is cheap: OxiBuilder::new().with_builtins().build() populates registries from static model_db data (~1μs, no I/O, no network).

§Concurrency

  • parking_lot::RwLock is not async-aware, but engine swap only occurs on explicit user action (Web UI / CLI config change) — never in a hot path.
  • Agent execution reads the engine once at the start of execute() and uses the same Arc<OxiosEngine> for the entire run (consistent within one execution).

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impl EngineHandle

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pub fn new(engine: Arc<OxiosEngine>) -> Self

Create a new handle wrapping the given engine.

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pub fn get(&self) -> Arc<OxiosEngine> ⓘ

Get a snapshot of the current engine.

The returned Arc is stable — it won’t change even if another thread calls swap() concurrently.

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pub fn swap(&self, new_engine: OxiosEngine)

Atomically replace the engine with a new one.

Callers should rebuild OxiosEngine with updated credentials/model before calling this.

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pub fn resolve_default(&self) -> Result<ResolvedModel>

Resolve the live default model + a cached provider.

This is the single source of truth for “which model does this task use”, shared by the Ouroboros phases (via the ModelResolver impl) and the kernel’s AgentRuntime (execute). Reads the engine’s current default_model_id — which reflects hot-swaps — so a model change via the Web UI takes effect on the next phase call.

Providers are cached per provider name and invalidated on [swap], so repeated resolution within one engine generation is cheap.

Trait Implementations§

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impl Debug for EngineHandle

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

Formats the value using the given formatter. Read more
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impl ModelResolver for EngineHandle

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fn resolve_default(&self) -> Result<ResolvedModel>

Resolve the engine’s live default model + provider. Read more

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