What is Saga and Cqrs microservices design pattern?

Anjali Sharma answered on January 4, 2023 Popularity 3/10 Helpfulness 3/10

answer What is Saga and Cqrs microservices design pattern?

What is Saga and Cqrs microservices design pattern?

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The SAGA pattern is a failure management pattern that brings consistency in distributed applications and coordinates transactions between various microservices to maintain consistency.

Command and Query Responsibility Segregation or CQRS is a pattern that separates read and update operations for a data store

public class UserProjector {
    UserReadRepository readRepository = new UserReadRepository();
    public UserProjector(UserReadRepository readRepository) {
        this.readRepository = readRepository;
    }

    public void project(User user) {
        UserContact userContact = Optional.ofNullable(
          readRepository.getUserContact(user.getUserid()))
            .orElse(new UserContact());
        Map<String, Set<Contact>> contactByType = new HashMap<>();
        for (Contact contact : user.getContacts()) {
            Set<Contact> contacts = Optional.ofNullable(
              contactByType.get(contact.getType()))
                .orElse(new HashSet<>());
            contacts.add(contact);
            contactByType.put(contact.getType(), contacts);
        }
        userContact.setContactByType(contactByType);
        readRepository.addUserContact(user.getUserid(), userContact);

        UserAddress userAddress = Optional.ofNullable(
          readRepository.getUserAddress(user.getUserid()))
            .orElse(new UserAddress());
        Map<String, Set<Address>> addressByRegion = new HashMap<>();
        for (Address address : user.getAddresses()) {
            Set<Address> addresses = Optional.ofNullable(
              addressByRegion.get(address.getState()))
                .orElse(new HashSet<>());
            addresses.add(address);
            addressByRegion.put(address.getState(), addresses);
        }
        userAddress.setAddressByRegion(addressByRegion);
        readRepository.addUserAddress(user.getUserid(), userAddress);
    }
}

https://www.tenupsoft.com/blog/The-importance-of-cqrs-and-saga-in-microservices-architecture.html#:~:text=The%20SAGA%20pattern%20is%20a,operations%20for%20a%20data%20store.

Popularity 3/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: cqrs javascript microservices saga

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Contributed on Jan 04 2023

Anjali Sharma

0 Answers Avg Quality 2/10

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