Trait cqrs_es::DomainEvent

pub trait DomainEvent: Serialize + DeserializeOwned + Clone + PartialEq + Debug + Sync + Send {
    // Required methods
    fn event_type(&self) -> String;
    fn event_version(&self) -> String;
}

A DomainEvent represents any business change in the state of an Aggregate. DomainEvents are immutable, and when event sourcing is used they are the single source of truth.

The name of a DomainEvent should always be in the past tense, e.g.,

• AdminPrivilegesGranted
• EmailAddressChanged
• DependencyAdded

To simplify serialization, an event should be an enum, and each variant should carry any important information.

Though the DomainEvent trait only has a single function, the events must also derive a number of standard traits.

• Clone - events may be cloned throughout the framework, particularly when applied to queries
• Serialize and Deserialize - required for persistence
• PartialEq and Debug - needed for effective testing

Examples

#[derive(Clone,Debug,Serialize,Deserialize,PartialEq)]
pub enum CustomerEvent {
    NameChanged{ changed_name: String },
    EmailUpdated{ new_email: String },
}

Required Methods

fn event_type(&self) -> String

A name specifying the event, used for event upcasting.

fn event_version(&self) -> String

A version of the event_type, used for event upcasting.

Object Safety

This trait is not object safe.

Implementors