DDD Base

Domain Driven Design base package for Java.

How to use?

please refer https://jitpack.io/#linux-china/ddd-base/1.0.6

Features

• Annotations
• base classes for entity, domain event etc
• domain event
• spring annotation integration???

Components

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

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

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

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

• CloudEvents Specification: https://github.com/cloudevents/spec/blob/v0.1/spec.md