Library Application

This is a showcase application. It aims to demonstrate several software engineering practices and a lot of current technology. The application itself is book management system which allows for:

• adding of new books
• listing of books
• borrowing of books
• returning of borrowed books

The application is divided into several modules:

• The library-service is the main backend application. It manages the data, dispatches domain events and manages consistency.
• The library-enrichment is a background service which reacts to book-added domain events by looking up additional information about newly added books. If it finds any, it will update the book record via the library-service.
• The library-integration-slack is a service which reacts to book-added domain events by posting them to a configured slack channel.
• The library-ui is a client side frontend for the library-service. It allows for the management of the library as well as the borrowing and returning of books by customers.

Technology Showcases

• Kotlin (library-service and library-enrichment)
• Spring Boot 2 (library-service and library-enrichment)
• JUnit 5 with custom extensions (library-service and library-enrichment)
• MongoDB with Spring Data (library-service)
• AMQP with RabbitMQ (library-service and library-enrichment)
• Hypermedia APIs with Spring HATEOAS (library-service)
• Test-driven API documentation with Spring REST Docs (library-service)
• Documentation generation with Asciidoctor (library-service)
• Declarative REST Clients with Feign (library-enrichment)
• Contract Testing with PACT (library-service and library-enrichment)

Software Engineering Practices

• Modular Application Design
• Object Oriented Design
• Hexagonal Architectures
• Clean Code
• Testable Architecture / Design
• Test Automation
• Unit, Integration and Acceptance Tests
• Testing application slices