Struct KeyByOperator 

pub struct KeyByOperator<T, E>
where
    T: Send + Sync + Clone,
    E: KeyExtractor<T> + Send + Sync,
{ /* private fields */ }

KeyBy operator - partitions events by key

Example

use processor::pipeline::operator::KeyByOperator;
use processor::core::{EventKey, KeyExtractor};

// Define a key extractor
struct MyKeyExtractor;
impl KeyExtractor<i32> for MyKeyExtractor {
    fn extract_key(&self, event: &i32) -> EventKey {
        EventKey::Session(event.to_string())
    }
}

let operator = KeyByOperator::new("partition", MyKeyExtractor);

Implementations

impl<T, E> KeyByOperator<T, E>

where T: Send + Sync + Clone + DeserializeOwned, E: KeyExtractor<T> + Send + Sync,

pub fn new<S: Into<String>>(name: S, extractor: E) -> Self

Create a new key-by operator

pub fn extract_key(&self, event: &T) -> EventKey

Extract the key from an event

Trait Implementations

impl<T, E> Debug for KeyByOperator<T, E>

where T: Send + Sync + Clone, E: KeyExtractor<T> + Send + Sync,

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

Formats the value using the given formatter.

impl<T, E> StreamOperator for KeyByOperator<T, E>

where T: Send + Sync + Clone + DeserializeOwned + Serialize, E: KeyExtractor<T> + Send + Sync,

fn process<'life0, 'life1, 'async_trait>( &'life0 self, input: Vec<u8>, _ctx: &'life1 OperatorContext, ) -> Pin<Box<dyn Future<Output = Result<Vec<Vec<u8>>>> + Send + 'async_trait>>

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

Process an event and return transformed events

fn name(&self) -> &str

Get the operator name

fn open<'life0, 'async_trait>( &'life0 mut self, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Called when the operator is initialized

fn close<'life0, 'async_trait>( &'life0 mut self, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait,

Called when the operator is shut down