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public class CreateOrderCommand {
 
    private final String orderId;
    private final String productId;
 
    public CreateOrderCommand(String orderId, String productId) {
        this.orderId = orderId;
        this.productId = productId;
    }
 
    public String getOrderId() {
        return orderId;
    }
 
    public String getProductId() {
        return productId;
    }
}

import org.axonframework.domain.DomainEvent;
 
public abstract class AbstractOrderEvent extends DomainEvent {
    public String getOrderId() {
        return getAggregateIdentifier().asString();
    }
}

public class OrderCreatedEvent extends AbstractOrderEvent {
 
    private final String productId;
 
    public OrderCreatedEvent(String productId) {
        this.productId = productId;
    }
 
    public String getProductId() {
        return productId;
    }
}

@CommandHandler
public void createOrder(CreateOrderCommand command) {
    orderRepository.add(new Order(command.getOrderId(), command.getProductId()));
}
 
@CommandHandler
public void confirmOrder(ConfirmOrderCommand command) {
    Order order = orderRepository.load(new StringAggregateIdentifier(command.getOrderId()));
    order.confirm();
}

public void confirm() {
// we can only confirm an open order.
    if (status == Status.OPEN) {
        apply(new OrderConfirmedEvent());
    }
}
 
@EventHandler  //Handler調用這里方法
private void onConfirm(OrderConfirmedEvent event) {
    status = Status.CONFIRMED;
}

@Component //Spring的標注
public class OrderEventHandler {
 
    @EventHandler
    public void handleOrderCreated(OrderCreatedEvent event) {
        System.out.println(String.format("An order is created: [%s] for product: [%s]",
                                         event.getOrderId(),
                                         event.getProductId()));
    }
 
    @EventHandler
    public void handleOrderCancelled(OrderCancelledEvent event) {
        System.out.println(String.format("An order is cancelled: [%s]", event.getOrderId()));
    }
 
    @EventHandler
    public void handleOrderConfirmed(OrderConfirmedEvent event) {
        System.out.println(String.format("An order is confirmed: [%s]", event.getOrderId()));
    }
}