Struct EpContextRegistry 

pub struct EpContextRegistry { /* private fields */ }

Registry mapping an EPContext node’s source key → the EpId that owns it (docs/ORT2.md §55.6).

EPs register the source key(s) they accept; dispatch (claim) is a pure lookup. There are no hardcoded vendor names here — the keys come entirely from each EP’s ExecutionProvider::context_source_keys.

Duplicate keys are rejected (reject-duplicate-key)

register returns EpError::DuplicateContextSource if a source key is already claimed by another EP, rather than silently overwriting (last-writer-wins) it. Rationale: two EPs claiming the same source is a configuration error (the model would dispatch ambiguously), and silently dropping one binding would make which EP restores a context depend on registration order — a non-deterministic, hard-to-debug failure at load. A registrant re-declaring the same (key, ep) binding is idempotent and accepted (it is not a conflict).

Implementations

impl EpContextRegistry

pub fn new() -> Self

An empty registry.

pub fn register(&mut self, ep: EpId, source_keys: &[String]) -> Result<()>

Declare that ep accepts each key in source_keys for EPContext dispatch. Keys come from the EP’s own config/data (§55.6), never hardcoded here.

Errors

Returns EpError::DuplicateContextSource if any key is already registered to a different EP (reject-duplicate-key). Re-registering the same (key, ep) binding is idempotent. On error, keys processed before the conflict remain registered (the caller should treat a duplicate as a fatal configuration error).

pub fn claim(&self, source: Option<&str>) -> Option<EpId>

Look up the EP that owns a node’s source attribute (§55.6).

A pure lookup: None source (attribute absent) or a source matching no registered EP both yield None — the node is unclaimed. The session turns an unclaimed node into a clear EpError::NoEpForContext rather than guessing.

pub fn len(&self) -> usize

Number of registered source keys.

pub fn is_empty(&self) -> bool

Whether no source keys are registered.

Trait Implementations

impl Clone for EpContextRegistry

fn clone(&self) -> EpContextRegistry

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EpContextRegistry

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

Formats the value using the given formatter.

impl Default for EpContextRegistry

fn default() -> EpContextRegistry

Returns the “default value” for a type.