How messaging works in microservices

Deepika Sahu answered on December 15, 2022 Popularity 6/10 Helpfulness 1/10

answer How messaging works in microservices

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How messaging works in microservices

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public class OrderService {

  ...

  public Order createOrder(long consumerId, long restaurantId,
                           List<MenuItemIdAndQuantity> lineItems) {
    Restaurant restaurant = restaurantRepository.findById(restaurantId)
            .orElseThrow(() -> new RestaurantNotFoundException(restaurantId));

    List<OrderLineItem> orderLineItems = makeOrderLineItems(lineItems, restaurant);

    ResultWithDomainEvents<Order, OrderDomainEvent> orderAndEvents =
            Order.createOrder(consumerId, restaurant, orderLineItems);

    Order order = orderAndEvents.result;
    orderRepository.save(order);

    orderAggregateEventPublisher.publish(order, orderAndEvents.events);

    OrderDetails orderDetails = new OrderDetails(consumerId, restaurantId, orderLineItems, order.getOrderTotal());

    CreateOrderSagaState data = new CreateOrderSagaState(order.getId(), orderDetails);
    createOrderSagaManager.create(data, Order.class, order.getId());

    meterRegistry.ifPresent(mr -> mr.counter("placed_orders").increment());

    return order;
  }

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Source: microservices.io

Tags: messaging microservices whatever

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Contributed on Dec 15 2022

Deepika Sahu

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There are two basic messaging patterns that microservices can use to communicate with other microservices.
Synchronous communication. In this pattern, a service calls an API that another service exposes, using a protocol such as HTTP or gRPC. ...
Asynchronous message passing.

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Source: Grepper

Tags: whatever microservices messaging m

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Contributed on Dec 15 2022

Deepika Sahu

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How messaging works in microservices

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