Trait Reducer 

pub trait Reducer: Send + Sync {
    // Required method
    fn reduce(&self, current: &Value, update: &Value) -> Result<Value>;
}

A reducer combines old and new values during state updates. Critical for correctness during parallel execution.

Required Methods

fn reduce(&self, current: &Value, update: &Value) -> Result<Value>

Combine the current value with the new value

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Reducer for AddReducer

impl Reducer for AppendReducer

impl Reducer for LastWriteWins

impl Reducer for MergeReducer

impl<F> Reducer for FnReducer<F>

where F: Fn(&Value, &Value) -> Result<Value> + Send + Sync,