Struct CompositionValidator 

pub struct CompositionValidator;

Composes multiple subgraph schemas into a supergraph

Validates cross-subgraph consistency and produces a composed supergraph schema that combines all federated types and directives from input subgraphs.

Implementations

impl CompositionValidator

pub fn new() -> Self

Create a new composition validator

Type conflicts always produce errors (safest default).

Example

let validator = CompositionValidator::new();

pub fn validate_composition( &self, subgraphs: Vec<(String, FederationMetadata)>, ) -> Result<ComposedSchema, Vec<CompositionError>>

Validate and compose multiple subgraphs into a supergraph

Performs two-phase composition:

1. Validate: Cross-subgraph consistency checking
2. Compose: Merge types into supergraph schema

Arguments

• subgraphs: Named subgraph metadata to compose

Errors

Returns vector of all composition errors if validation or composition fails.

Example

let subgraphs = vec![
    ("users".to_string(), users_metadata),
    ("orders".to_string(), orders_metadata),
];

let validator = CompositionValidator::new();
let composed = validator.validate_composition(subgraphs)?;

Trait Implementations

impl Debug for CompositionValidator

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

Formats the value using the given formatter.

impl Default for CompositionValidator

fn default() -> Self

Returns the “default value” for a type.