Struct NodeHandle 

pub struct NodeHandle<K, V> { /* private fields */ }

A typed handle to a node in a Topology.

Topology::add_source and Topology::add_processor return a handle. Pass it by reference as a parent when you add a child node.

Wiring uses values and not string names, so the compiler does two checks. First, a parent that does not exist yet has no handle to pass, so you cannot write a forward reference or a cycle. Second, the compiler checks the parent’s output type (K, V) against the child’s input type. A mismatch is a compile error, not a runtime build() failure.

K and V are the key and value types the node produces. The handle is cheap to Clone, because it carries only the node name, so one parent can feed many children.

Implementations

impl<K, V> NodeHandle<K, V>

pub fn name(&self) -> &str

The node’s name, as it appears in the wire topology.

Topology::add_state_store needs this name, because it connects stores to processors by name.

Trait Implementations

impl<K, V> Clone for NodeHandle<K, V>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<K, V> Debug for NodeHandle<K, V>

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

Formats the value using the given formatter.