Struct InMemoryEngine 

pub struct InMemoryEngine {
    pub graph: Graph,
    pub params: HashMap<String, Value>,
}

Reference in-memory engine for integration testing and conformance validation.

This engine prioritizes correctness and readability over performance. It uses O(n) linear scans for entity lookups and clones row sets between pipeline stages. Do not use as a template for production engine performance patterns.

Production engines should implement PlanEngine (and optionally MutationEngine) against their own storage, or use the StorageAdapter trait for property-graph mapping. See docs/engine-implementor-guide.md.

Fields

graph: Graph

params: HashMap<String, Value>

Implementations

impl InMemoryEngine

pub fn new(graph: Graph) -> Self

pub fn with_params(graph: Graph, params: HashMap<String, Value>) -> Self

pub fn set_param(&mut self, name: impl Into<String>, value: Value)

pub fn clear_params(&mut self)

Trait Implementations

impl Clone for InMemoryEngine

fn clone(&self) -> InMemoryEngine

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for InMemoryEngine

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

Formats the value using the given formatter.

impl Default for InMemoryEngine

fn default() -> InMemoryEngine

Returns the “default value” for a type.

impl MutationEngine for InMemoryEngine

type Error = ExecutionError

fn create_node( &mut self, labels: &[String], props: HashMap<String, Value>, ) -> Result<u64, Self::Error>

fn create_rel( &mut self, src: u64, dst: u64, rel_type: &str, props: HashMap<String, Value>, ) -> Result<u64, Self::Error>

fn merge_pattern( &mut self, pattern: &Expr, on_create_props: &Expr, on_match_props: &Expr, schema: &[ColDef], row: &Row, ) -> Result<(), Self::Error>

fn delete_entity( &mut self, target: &Value, detach: bool, ) -> Result<(), Self::Error>

fn set_property( &mut self, target: &Value, key: &str, value: Value, ) -> Result<(), Self::Error>

fn remove_property( &mut self, target: &Value, key: &str, ) -> Result<(), Self::Error>

impl PlanEngine for InMemoryEngine

type Error = ExecutionError

fn execute_plan(&mut self, plan: &Plan) -> Result<QueryResult, Self::Error>

Execute a deserialized plan.