聊聊cheddar的DomainEvent

public interface DomainEvent extends Event {

}

public abstract class AbstractDomainEvent extends AbstractEvent implements DomainEvent {

    public abstract String context();

    @Override
    public final String type() {
        return context() + "." + getClass().getSimpleName();
    }

}

public interface DomainEventHandler extends EventHandler<DomainEvent> {

}

public interface HighPriorityDomainEventHandler extends DomainEventHandler {

}

public interface LowPriorityDomainEventHandler extends DomainEventHandler {

}

public class DomainEventPublisher extends EventPublisher<DomainEvent> {

    private static DomainEventPublisher instance;

    public static void init(final MessagePublisher<TypedMessage> messagePublisher) {
        instance = new DomainEventPublisher(messagePublisher);
    }

    private DomainEventPublisher(final MessagePublisher<TypedMessage> messagePublisher) {
        super(messagePublisher);
    }

    public static DomainEventPublisher instance() {
        if (instance == null) {
            throw new IllegalStateException("DomainEventPublisher not initialized");
        }
        return instance;
    }

}