DDD

• What is DDD?
• Why DDD is needed?
• What is aggregate in DDD?
• What is anemic domain model?
• What is the correct way for having relations between aggregates?
• How to update several aggregates during one transaction?
• What is event storming?
• How domain events are related to eventual consistency?
• What is the difference between domain events and event sourcing?
• What is CQRS?
• What is the best practice for validation in DDD?
• What is the best practice for Value Object?
• Possible issues with using domain model with public getters/setters and empty constructor?
• How to work with large domain models? Is it correct to have a lot of fields in domain model?
• How should be published integration events? Inside or outside transaction?
• How to define the reference between aggregates?
• Where to put validation rule for value object?
• Possible integration ways between modules?

What is DDD?

Relative links:

• https://vaadin.com/learn/tutorials/ddd/strategic_domain_driven_design
• https://vaadin.com/learn/tutorials/ddd/tactical_domain_driven_design
• https://vaadin.com/learn/tutorials/ddd/ddd_and_hexagonal
• https://github.com/peholmst/DDDExample

Why DDD is needed?

Relative links:

• https://simpleprogrammer.com/importance-domain-driven-design/

What is aggregate in DDD?

Relative links:

• https://martinfowler.com/bliki/DDD_Aggregate.html

What is anemic domain model?

Relative links:

• https://martinfowler.com/bliki/AnemicDomainModel.html
• https://thedomaindrivendesign.io/anemic-model/

What is the correct way for having relations between aggregates?

Relative links:

• https://vaadin.com/learn/tutorials/ddd/tactical_domain_driven_design

How to update several aggregates during one transaction?

Relative links:

• https://docs.microsoft.com/en-us/dotnet/architecture/microservices/microservice-ddd-cqrs-patterns/domain-events-design-implementation

What is event storming?

Relative links:

• https://philippe.bourgau.net/how-to-use-event-storming-to-introduce-domain-driven-design/
• https://github.com/mariuszgil/awesome-eventstorming

How domain events are related to eventual consistency?

Relative links:

• https://www.infoq.com/news/2015/09/domain-events-consistency/

What is the difference between domain events and event sourcing?

Relative links:

• https://www.innoq.com/en/blog/domain-events-versus-event-sourcing/

What is CQRS?

Relative links:

• https://docs.microsoft.com/en-us/azure/architecture/patterns/cqrs
• https://www.kamilgrzybek.com/design/simple-cqrs-implementation-with-raw-sql-and-ddd/
• https://dzone.com/articles/cqrs-understanding-from-first-principles
• https://stackoverflow.com/questions/24474859/what-is-the-difference-between-command-commandhandler-and-service

What is the best practice for validation in DDD?

Relative links:

• https://docs.microsoft.com/en-us/dotnet/architecture/microservices/microservice-ddd-cqrs-patterns/domain-model-layer-validations
• http://gorodinski.com/blog/2012/05/19/validation-in-domain-driven-design-ddd/
• https://enterprisecraftsmanship.com/posts/always-valid-vs-not-always-valid-domain-model/
• https://enterprisecraftsmanship.com/posts/validation-and-ddd/
• https://danielwhittaker.me/2016/04/20/how-to-validate-commands-in-a-cqrs-application/
• https://enterprisecraftsmanship.com/posts/validate-commands-cqrs/
• http://www.kamilgrzybek.com/design/domain-model-validation/
• http://www.kamilgrzybek.com/design/rest-api-data-validation/

What is the best practice for Value Object?

Relative links:

• https://dzone.com/articles/value-objects

Possible issues with using domain model with public getters/setters and empty constructor?

Relative links:

• https://thedomaindrivendesign.io/anemic-model/

How to work with large domain models? Is it correct to have a lot of fields in domain model?

Relative links:

• https://martinfowler.com/bliki/BoundedContext.html

How should be published integration events? Inside or outside transaction?

Relative links:

• https://devblogs.microsoft.com/cesardelatorre/domain-events-vs-integration-events-in-domain-driven-design-and-microservices-architectures/

How to define the reference between aggregates?

Relative links:

• https://www.informit.com/articles/article.aspx?p=2020371&seqNum=4

Where to put validation rule for value object?

Relative links:

• https://builtwithdot.net/blog/where-do-i-put-my-business-rules-and-validation

Possible integration ways between modules?

Relative links:

• https://www.kamilgrzybek.com/design/modular-monolith-integration-styles/