Struct StateUpdate 

pub struct StateUpdate<S: StateSchema> {
    pub update: Option<S>,
    pub metadata: HashMap<String, Value>,
}

State update representation

Nodes return StateUpdate which contains partial updates to the state. The reducer pattern determines how updates are merged into the full state.

Fields

update: Option<S>

Full or partial state update

metadata: HashMap<String, Value>

Additional metadata (for debugging/tracing)

Implementations

impl<S: StateSchema> StateUpdate<S>

pub fn full(state: S) -> Self

Create a full state update

pub fn with_metadata(state: S, metadata: HashMap<String, Value>) -> Self

Create update with metadata

pub fn unchanged() -> Self

Create a no-change update (for nodes that don’t modify state)

pub fn add_metadata(&mut self, key: String, value: Value)

Add metadata entry

Trait Implementations

impl<S: Clone + StateSchema> Clone for StateUpdate<S>

fn clone(&self) -> StateUpdate<S>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<S: Debug + StateSchema> Debug for StateUpdate<S>

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

Formats the value using the given formatter.

impl<S> Serialize for StateUpdate<S>

where S: Serialize + StateSchema,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.