Struct ViewDefinition 

pub struct ViewDefinition {
    pub id: String,
    pub name: String,
    pub sparql_query: String,
    pub accessed_predicates: Vec<String>,
    pub created_at: Instant,
}

Definition of a materialized view.

A view is identified by a unique id and backed by a SPARQL SELECT query. The accessed_predicates list is used to decide which triple deltas can affect this view; if the list is empty the view is considered to be affected by all changes.

Fields

id: String

Unique identifier for this view (e.g. a UUID or user-supplied name).

name: String

Human-readable name.

sparql_query: String

SPARQL SELECT query whose result set defines this view.

accessed_predicates: Vec<String>

Predicate IRIs that this view’s query reads. Used for selective delta propagation. If empty, the view is assumed to depend on all predicates.

created_at: Instant

When this definition was registered.

Implementations

impl ViewDefinition

pub fn new( id: impl Into<String>, name: impl Into<String>, sparql_query: impl Into<String>, accessed_predicates: Vec<String>, ) -> Self

Create a new view definition.

accessed_predicates should list every predicate IRI that appears in the SPARQL query’s triple patterns. An empty list means “depends on everything.”

Trait Implementations

impl Clone for ViewDefinition

fn clone(&self) -> ViewDefinition

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ViewDefinition

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

Formats the value using the given formatter.