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Domain-Driven Design with SeedStack, OW2con'2018, June 7-8, 2018, Paris
SeedStack is a modular Java framework for building REST microservices, web applications, and CLI applications using domain-driven design principles. It provides an opinionated architecture and ready-to-use building blocks for implementing DDD patterns like entities, value objects, aggregates, repositories, and services. Major features include dependency injection, security, REST support, and tools for configuration, logging, transactions, and validation. It is used by Groupe PSA for over 100 projects and serves as their standard Java stack.
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Domain-Driven Design with SeedStack, OW2con'2018, June 7-8, 2018, Paris
- 1. SeedStack Domain-Driven Design atthe enterprise scale seedstack.org twitter.com/seedstack github.com/seedstack
- 2. Agenda What is SeedStack? Domain-Driven Design with SeedStack Quick demo
- 3. What is SeedStack ? Amodular Java 8+ framework to build: REST micro-services ClassicWeb applications CLI applications An opinionated solution for robust projects Top-notch software architecture for your projects Domain-Driven Design for your business An easily extensible kernel/plugin design Open-source under MPL 2.0 license
- 4. SeedStack at «Groupe PSA» About 100 projects in various business domains, like: Connected-car Manufacturing Finance R&D The reference software stack for Java projects: Done internally Contracted out to our suppliers (CapGemini, ATOS, …) Minimally extended by closed-source proprietary add-ons Security add-on Integration with legacy PSA frameworks
- 5. How is itused ? Each project is composed of one or more independent modules Modules are generated using SeedStack Maven plugin: REST micro-services Command-line programs Batch jobs Reusable business domains Each module follows the same reference software architecture providing organization-wide consistency SeedStack Maven plugin also does production-ready packaging
- 6. Main features Core Security Web Extensions Tooling Config, logging, transactions,validation … GoogleGuice dependency injection Apache Shiro security Undertow embedded server Jersey 2 REST + Hypermedia Web sockets Business framework (DDD) 32+ add-ons Project generator, one-JAR packaging, LiveReload, … 18.4 18.7 18.11
- 7. Domain-Driven Design A software approachfocused on solving business problems with code: Strategic design, addressing high-level considerations of domain knowledge Tactical design, proposing practical patterns to write the required software Implemented in the SeedStack business framework: Detection of DDD patterns Ready-to-use building blocks Automation of recurrent tasks
- 8. SeedStack DDD HelloWorld! @Path("/hello/{name}") public classHelloResource { @Inject private GreeterService greeterService; @GET @Produces(MediaType.TEXT_HTML) public String hello(@PathParam("name") String name) { return greeterService.sayHello(name); } @Service interface GreeterService { String sayHello(String name); } static class HtmlGreeterService implements GreeterService { @Override public String sayHello(String name) { return "<h1>Hello " + name + "!</h1>"; } } } ❶ ❷ ❸ ❶ ❸ REST with Jersey 2 Dependency injection DDD service ❷ ❸
- 9. SeedStack DDD Patterns Modeling Behavior Interfaces Entities Value objects Aggregates Specifications Factories Repositories Services Policies Events Assemblers Paginator Mutableobjects with identity Immutable objects without identity Cohesion and integrity Querying Creation logic Persistence logic Business logic Business rules Business events Object mapping Offset, page and key-based pagination
- 10. SeedStack DDD Building blocks Businessframework implements patterns using: Annotations Interfaces Base classes Patterns are strongly-typed using Java generics: They are automatically detected and validated on startup They can be injected anywhere @Inject @InMemory private Repository<Customer, CustomerId> customerRepository; Annotations Interfaces Base classes @Inject private CustomerFactory customerFactory; @Inject private SomeService someService;
- 11. SeedStack DDD Automation SeedStack helpsto avoid most boilerplate code: Offset, page or key-based pagination DSL Translation of domain specifications to database-specific queries Object-mapping strategies and DSL ❶ ❷ ❸ @Path("/customers") public class CustomersResource { @Inject @Jpa private Repository<Customer, CustomerId> customerRepository; @Inject private FluentAssembler fluentAssembler; @Inject private Paginator paginator; @GET @Produces(MediaType.APPLICATION_JSON) public Page<CustomerDto> pageOfVipCustomers(…) { return fluentAssembler.assemble( paginator.paginate(customerRepository) .byPage(pageIndex) .ofSize(10) .matching(new CustomerVipSpec(100))) .toPageOf(CustomerDto.class); } } ❶ ❷ ❸
- 12.
- 13. Thank you! SeedStack islicensed under MPL 2.0: Business-friendly Composable with other licenses Feel free to test, use, and contribute to it! http://seedstack.org https://github.com/seedstack https://twitter.com/seedstack