Struct LocalEvaluator 

pub struct LocalEvaluator { /* private fields */ }

Evaluates feature flags using locally cached definitions.

The evaluator reads from a FlagCache to determine flag values without making network requests. Supports cohort membership checks and flag dependencies through the evaluation context.

Implementations

impl LocalEvaluator

pub fn new(cache: FlagCache) -> Self

Create an evaluator backed by a shared FlagCache.

pub fn cache(&self) -> &FlagCache

Access the underlying flag cache (e.g. to read group type mappings).

pub fn evaluate_flag( &self, key: &str, distinct_id: &str, person_properties: &HashMap<String, Value>, groups: &HashMap<String, String>, group_properties: &HashMap<String, HashMap<String, Value>>, ) -> Result<Option<FlagValue>, InconclusiveMatchError>

Evaluate a feature flag locally with full context support.

Supports cohort membership checks, flag dependency evaluation, and group / mixed-targeting flags. groups and group_properties are only consulted when the flag (or one of its conditions) targets a group via aggregation_group_type_index; pass empty maps for person-targeted flags.

Returns

Ok(Some(value)) when the flag is present and evaluated, Ok(None) when the flag is absent from the cache.

Errors

Returns InconclusiveMatchError when required properties, cohorts, or dependent flags are unavailable locally.

pub fn evaluate_flag_simple( &self, key: &str, distinct_id: &str, person_properties: &HashMap<String, Value>, groups: &HashMap<String, String>, group_properties: &HashMap<String, HashMap<String, Value>>, ) -> Result<Option<FlagValue>, InconclusiveMatchError>

Evaluate a feature flag locally without cohort or flag dependency support.

Use this when you know the flag doesn’t have cohort or flag dependency conditions.

Returns

Ok(Some(value)) when the flag is present and evaluated, Ok(None) when the flag is absent from the cache.

Errors

Returns InconclusiveMatchError when required properties are unavailable locally.

pub fn evaluate_all_flags( &self, distinct_id: &str, person_properties: &HashMap<String, Value>, groups: &HashMap<String, String>, group_properties: &HashMap<String, HashMap<String, Value>>, ) -> HashMap<String, Result<FlagValue, InconclusiveMatchError>>

Get all flags and evaluate them with full context support.

The returned map is keyed by feature flag key. Each value can be an inconclusive error if that particular flag could not be evaluated from the supplied context.

Trait Implementations

impl Clone for LocalEvaluator

fn clone(&self) -> LocalEvaluator

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.