pub trait DecisionEngine: Send + Sync {
// Required methods
fn backend_id(&self) -> &str;
fn evaluate<'life0, 'async_trait>(
&'life0 self,
req: SystemRequest,
) -> Pin<Box<dyn Future<Output = Result<SystemResponse, EngineError>> + Send + 'async_trait>>
where 'life0: 'async_trait,
Self: 'async_trait;
// Provided methods
fn model_metadata(&self) -> ModelInfo { ... }
fn estimate_input_tokens(&self, req: &SystemRequest) -> u32 { ... }
}Expand description
The trait every backend implements. The engine is runtime-agnostic:
it doesn’t know it’s being served over HTTP or gRPC — that’s deliberate.
Callers pass SystemRequest in and get SystemResponse back.
Required Methods§
Sourcefn backend_id(&self) -> &str
fn backend_id(&self) -> &str
Identifier of this backend, e.g. "mock", "qwen-3b-candle".
Sourcefn evaluate<'life0, 'async_trait>(
&'life0 self,
req: SystemRequest,
) -> Pin<Box<dyn Future<Output = Result<SystemResponse, EngineError>> + Send + 'async_trait>>where
'life0: 'async_trait,
Self: 'async_trait,
fn evaluate<'life0, 'async_trait>(
&'life0 self,
req: SystemRequest,
) -> Pin<Box<dyn Future<Output = Result<SystemResponse, EngineError>> + Send + 'async_trait>>where
'life0: 'async_trait,
Self: 'async_trait,
Evaluate a single request. Returns one answer per question id.
Provided Methods§
Sourcefn model_metadata(&self) -> ModelInfo
fn model_metadata(&self) -> ModelInfo
Public metadata shown by GET /v1/models. The default is a
minimal mock entry; real backends should override with a real
description and release date.
Sourcefn estimate_input_tokens(&self, req: &SystemRequest) -> u32
fn estimate_input_tokens(&self, req: &SystemRequest) -> u32
Estimate input tokens (cheap, before evaluation). The mock uses
a rough bytes / 4 heuristic for state, instructions, and criteria;
real backends will use a tokenizer.
Dyn Compatibility§
This trait is dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety".