/ddd-base

DDD(Domain Driven Design) base package for java

Primary LanguageJava

DDD Base

Domain Driven Design base package for Java.

How to use it in Java?

Please refer https://jitpack.io/#linux-china/ddd-base/1.1.0

Features

  • Annotations
  • base classes for entity, domain event etc
  • domain event: follow cloud event specification

Components

  • Data: Entity, VO and Aggregate
  • Behaviour: Repository, Service, Factory and Specification
  • Event
  • Infrastructure

Reactive

DDD + Reactive(RSocket) to make context map easy.

Code Structure

Please visit src/test/java for code structure

If you use Kotlin to develop application, the structure will be different, please add entity, vo and repository in the same kt file.

Events

Please extend DomainEvent or DomainEventBuilder, then use ApplicationEventPublisher to publish the event. please refer https://spring.io/blog/2015/02/11/better-application-events-in-spring-framework-4-2

Attention: Spring framework 5.2 will add reactive support: spring-projects/spring-framework#21831

How to create event class

  • Extend CloudEvent class:
public class LoginEvent extends CloudEvent<String> {

    public LoginEvent(String email, String ip) {
        setData(email);
        setContentType("text/plain");
        setExtension("ip", ip);
    }
}
  • Create object directly
CloudEvent<String> loginEvent = new CloudEvent<String>("text/plain", "linux_china@hotmail.com");
  • Event Builder or reactive processor
CloudEvent<String> loginEvent = CloudEventBuilder.<String>newInstance().contentType("text/plain").data("linux_china@hotmail.com").build();

ObjectMapper

  • ObjectMapper creation
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
  • write as String
objectMapper.writeValueAsString(loginEvent);
  • read from json text
objectMapper.readValue(jsonText, new TypeReference<CloudEvent<String>>() {});

References