Mastering the Basics of Domain-Driven Design with Java

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Mastering the Basics of DDD Domain-Driven Design with Java Otávio Santana, Founder [email protected]

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Software Development Failure? Hyper-Focused Planning And Design Unexpected Complexities Poor Collaboration Between The Product And Engineering Teams Unclear Or Undefined Client Expectations

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The Complexity Paradox The More Answers We Find, the More Questions We Have Developer experience is a market Trade-offs The hype effect

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DDD? The biggest misunderstanding in the software industry! It is a framework! Repository, Entity Microservices Code only Java Complex

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DDD! Handling and focus to the Business Domains Transfer Knowledge Tactics Strategy

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Strategic DDD The biggest mistake when implementing DDD Domains and Subdomains Ubiquitous language Context Mapping Bounded Contexts

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Domains Central area of a company’s operations Subdomain Type Role Business Differentiation Complexity of Business Logic Core Subdomain Unique to the company, defining its identity and competitive advantage High High Generic Subdomain Common across all companies, standard business activities Low High Supporting Subdomain Supports core business activities without providing direct competitive advantage Medium Varies

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Domains The subdomains types

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Ubiquitous Language The core's communication Define common terminology The common language between experts and the engineering team. The same word can vary from context

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Bounded Contexts Subset of the ubiquitous language

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Context Mapping The relationships between these contexts Shared Kernel Customer-Supplier Conformist Anticorruption Layer Published Language Separate Ways Open Host Service

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Domain Storytelling A Collaborative, and Visual Way to Build DDD

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Tactic DDD The second step Entity Service Repository Aggregates Value Object Factories Events

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Strategic and Tactical Focus on tactics is the start of a huge mistake Get something done Working code isn't enough Tactical tornado Strategic Tactical Time Total progress

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Architecture vs Design The boundaries to DDD

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Architecture DDD Using Layers to abstraction Presentation Layer Application Layer Infrastructure Layer Domain Layer

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The Architecture styles There is a world beyond microservices and Hexagon model

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Clean Architecture How to Combine it with DDD?

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Software Architecture There is no space, the business is the goal!

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Show me the code Let’s show the code structure

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Context Code Design Documentation Software Architecture Software Engineering Test The principle of the ultimate sophistication Engineer Persistence Leadership

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Software Engineer & Architect Expert Otavio Santana Java Champion, Oracle ACE Book and blog writer Duke Choice Award Jakarta EE and MicroProfile JCP-EC-EG-EGL Apache and Eclipse Committer JCP Award

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Thank you! Otávio Santana OS Expert Founder, Software Engineer & Architect [email protected] https://www.linkedin.com/in/otaviojava/ https://www.youtube.com/@otaviojava https://twitter.com/otaviojava