Struct TopicDescriptor 

pub struct TopicDescriptor {
    pub topic_name: &'static str,
    pub keyed_by: Option<&'static str>,
    pub schema_json: &'static str,
    pub delivery: DeliveryMode,
    pub shard_config: Option<ShardConfig>,
}

Descriptor for a registered topic (from #[photon::topic] macro).

Used for runtime lookup and schema metadata.

Fields

topic_name: &'static str

Stable topic name (e.g., “user.notifications”).

keyed_by: Option<&'static str>

Optional key field name.

schema_json: &'static str

Reserved JSON schema metadata placeholder.

Currently always "{}" from #[photon::topic]. Not validated at publish time; do not infer schema enforcement from this field.

delivery: DeliveryMode

Publish routing mode (broadcast default).

shard_config: Option<ShardConfig>

Virtual shard settings when DeliveryMode::ConsumerGroup.

Implementations

impl TopicDescriptor

pub const fn new( topic_name: &'static str, keyed_by: Option<&'static str>, schema_json: &'static str, ) -> Self

Create a broadcast topic descriptor (default delivery mode).

pub const fn group( topic_name: &'static str, shard_count: u32, shard_by: Option<&'static str>, schema_json: &'static str, ) -> Self

Create a consumer-group topic with virtual shard routing.

pub fn is_consumer_group(&self) -> bool

Whether publishes route to virtual shard streams.

pub fn schema_value(&self) -> Option<Value>

Get schema as parsed JSON.

Trait Implementations

impl Clone for TopicDescriptor

fn clone(&self) -> TopicDescriptor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Collect for TopicDescriptor

impl Debug for TopicDescriptor

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

Formats the value using the given formatter.

impl Registrable for TopicDescriptor

fn registry_key(&self) -> &str

Return the unique lookup key used by the registry.