Trait Reducer 

pub trait Reducer: Send + Sync {
    // Required methods
    fn reduce<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        current: Option<&'life1 Value>,
        update: &'life2 Value,
    ) -> Pin<Box<dyn Future<Output = AgentResult<Value>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait;
    fn name(&self) -> &str;
    fn reducer_type(&self) -> ReducerType;
}

Reducer trait for state update strategies

A Reducer defines how to merge a state update with an existing value. Different keys in the state can have different reducers.

Example

// Messages should be appended
graph.add_reducer("messages", Box::new(AppendReducer));

// Result should overwrite
graph.add_reducer("result", Box::new(OverwriteReducer));

Required Methods

fn reduce<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, current: Option<&'life1 Value>, update: &'life2 Value, ) -> Pin<Box<dyn Future<Output = AgentResult<Value>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Reduce the current value with the update value

Arguments

• current - The current value (None if key doesn’t exist)
• update - The new value to merge

Returns

The merged result

fn name(&self) -> &str

Returns the name of this reducer

fn reducer_type(&self) -> ReducerType

Returns the type of this reducer

Implementors