This book is aimed at experienced Spring developers who are aspiring to become architects of enterprise-grade applications and at software architects who would like to leverage Spring to create effective application blueprints.

Chapter 1, Software Architecture Today, provides an overview of how software architectures are managed today and why they are still important. It discusses how the most recent needs of the software industry are handled by the new emerging architecture models and how they can help you to solve these new challenges.

Chapter 2, Software Architecture Dimensions, reviews the dimensions associated with software architectures and how they influence the building process of your applications. We will also introduce the C4 model used to document software architectures.

Chapter 3, Spring Projects, speaks about some of the most useful Spring Projects. It's important to know which tools are inside your toolbox because Spring provides a wide variety of tools that fit your needs and can be used to boost your development process.

Chapter 4, Client-Server Architectures, covers how client-server architectures work and the most common scenarios where this style of architecture can be applied. We will go through various implementations, starting from simple clients such as desktop applications to modern and more complex usages such as devices connected to the internet.

Chapter 5, MVC Architectures, speaks about MVC, which is one of the most popular and widely known architecture styles. In this chapter, you will get an in-depth understanding of how MVC architectures work.

Chapter 6, Event-Driven Architectures, explains the underlying concepts related to event-driven architectures and which issues they handle using a hands-on approach.

Chapter 7, Pipe-and-Filter Architectures, focuses heavily on Spring Batch. It explains how to build pipelines, which encapsulate an independent chain of tasks aimed to filter and process big amount of data.

Chapter 8, Microservices, provides an overview about how to implement microservice architectures using the spring cloud stack. It details every component and how they interact with each other in order to provide a fully functional microservice architecture.

Chapter 9, Serverless Architectures, speaks about many services on the internet that are ready-to-use and can be used as part of software systems, allowing companies to just focus on their own business core concerns. This chapter shows a new way to think about building applications around a series of third-party services to solve common problems such as authentication, file storage, and infrastructure. We will also review what FaaS approach is and how to implement it using Spring.

Chapter 10, Containerizing Your Applications, explains that containers are one of the most handy technologies used in the last few years. They help us to get rid of manual server provisioning and allow us to forget the headaches related to building production environments and the maintenance tasks for servers. This chapter shows how to generate an artifact ready for production that can be easily replaced, upgraded, and interchanged eliminating the common provisioning issues. Through this chapter, we will also introduce container orchestration and how to deal with it using Kubernetes.

Chapter 11, DevOps and Release Management, explains that Agile is one of the most common approaches to organizing teams and making them work together to build products more quickly. DevOps is an inherent technique of these teams, and it helps them to break unnecessary silos and boring processes, giving teams the chance to be in charge of the whole software development process from writing code to deploy applications in production. This chapter shows how to achieve this goal by embracing automation to reduce manual tasks and deploy applications using automated pipelines in charge of validating the written code, provisioning the infrastructure, and deploying the required artifacts in a production environment.

Chapter 12, Monitoring, explains that once the application is published, unexpected behaviors are not uncommon and that it's essential to notice them so that they can be fixed as quickly as possible. This chapter gives some recommendations regarding techniques and tools that can be used to monitor the performance of an application bearing in mind technical and business metrics.

Chapter 13, Security, explains that often security is one of the fields that teams do not pay close attention to when they are working on developing their products. There are a few key considerations that developers should keep in mind when they are writing code. Most of them are pretty obvious, while others aren't, so we will discuss all of them here.

Chapter 14, High Performance, explains that there is nothing more disappointing in a job than dealing with issues in production when an application is behaving in an unexpected way. In this chapter, we'll discuss some simple techniques that can be applied to get rid of these annoying problems by applying simple recommendations on a daily basis.

A good understanding of Java, Git, and Spring Framework is necessary before reading this book. A deep knowledge of OOP is desired, although some key concepts are reviewed in the first two chapters.

@RunWith(SpringRunner.class)
@SpringBootTest
public class ContextAwareTest {

    @Autowired
    ClassUnderTest classUnderTest;

    @Test
    public void validateAutowireWorks() throws Exception {
        Assert.assertNotNull(classUnderTest);
    }
}

@Service
public class MyCustomUsersDetailService implements UserDetailsService {

    @Override
    public UserDetails loadUserByUsername(String username) 
       throws UsernameNotFoundException {
        Optional<Customer> customerFound = findByUsername(username);
        ...
    }
}

$ curl -X POST http://your-api-url:8080/events/<EVENT_ID

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