Trait OnNewSubscription 

pub trait OnNewSubscription {
    type Index;
    type Event;

    // Required method
    fn on_new_subscription<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        request: &'life1 [&'life2 Self::Index],
    ) -> Pin<Box<dyn Future<Output = Result<Vec<Self::Event>, String>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait;
}

On New Subscription trait

This trait is optional and it is used to notify the application when a new subscription is created. This is useful when the application needs to send the initial state to the subscriber upon subscription

Required Associated Types

type Index

Index type

type Event

Subscription event type

Required Methods

fn on_new_subscription<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, request: &'life1 [&'life2 Self::Index], ) -> Pin<Box<dyn Future<Output = Result<Vec<Self::Event>, String>> + Send + 'async_trait>>

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

Called when a new subscription is created

Implementors