Trait cqrs_es2::IEventHandler[−][src]

pub trait IEventHandler<E: IEvent> {
    fn apply(&mut self, event: &E);
}

Expand description

Event handlers are usually the aggregates. It applies the events to its state.

Example

For illustration only:

use cqrs_es2::{
    example_impl::CustomerEvent,
    IEventHandler,
};

pub struct CustomerEventHandler {
    pub name: String,
    pub email: String,
    pub addresses: Vec<String>,
};

impl IEventHandler<CustomerEvent> for CustomerEventHandler {
    fn apply(
        &mut self,
        event: &CustomerEvent,
    ) {
        match event {
            CustomerEvent::NameAdded(payload) => {
                self.name = payload.changed_name.clone();
            },
            CustomerEvent::EmailUpdated(payload) => {
                self.email = payload.new_email.clone();
            },
            CustomerEvent::AddressUpdated(payload) => {
                self.addresses
                    .push(payload.new_address.clone())
            },
        }
    }
}

Trait cqrs_es2::IEventHandler[−][src]

Example

Required methods

fn apply(&mut self, event: &E)

Implementors