Struct LastNReducer 

pub struct LastNReducer {
    pub n: usize,
}

LastN reducer - keeps only the last N items in a list

Useful for maintaining a sliding window of values.

Example

// With n=3:
// Before: { "history": [1, 2, 3, 4, 5] }
// Update: { "history": 6 }
// After:  { "history": [4, 5, 6] }

Fields

n: usize

Maximum number of items to keep

Implementations

impl LastNReducer

pub fn new(n: usize) -> LastNReducer

Create a new LastN reducer

Trait Implementations

impl Clone for LastNReducer

fn clone(&self) -> LastNReducer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LastNReducer

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

Formats the value using the given formatter.

impl Reducer for LastNReducer

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

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

Reduce the current value with the update value

fn name(&self) -> &str

Returns the name of this reducer

fn reducer_type(&self) -> ReducerType

Returns the type of this reducer