دانلود کتاب تسلط بر APIهای Spring Boot 3: نوشتن APIهای مقیاس‌پذیر، واکنش‌پذیر و امن برای میکروسرویس‌ها با Spring Boot 3 و Java 21

In an ever-evolving technological landscape, the ability to design and implement scalable, secure, and efficient APIs has become a cornerstone of modern software development. APIs are not merely tools for communication between systems—they form the backbone of microservices architectures, enabling businesses to innovate and adapt to change swiftly. This book was born out of the realization that many developers face challenges in creating APIs that not only meet immediate requirements but are also robust, future-proof, and aligned with industry best practices. It is designed to provide readers with a comprehensive guide to mastering API design and implementation using Spring Boot, one of the most powerful and versatile frameworks available today. Throughout these chapters, we will explore how to build APIs using Spring Boot, covering synchronous APIs such as REST, GraphQL, and gRPC, as well as asynchronous, eventdriven APIs powered by Apache Kafka and Spring Cloud Stream. We will delve into topics like observability, distributed tracing, and security using OAuth2 and OpenID Connect. Finally, we will deploy microservices on Docker and Kubernetes, completing the journey from design to production. This book is intended for developers and architects seeking to enhance their understanding of API design using Spring Boot in the context of cloud-native applications. It is a practical guide filled with real-world examples to help you not just learn but apply these concepts to your projects. I hope this book serves as a valuable resource in your journey as a developer. Thank you for embarking on this learning experience with me. Chapter 1: Introduction to REST Architecture and API-first Approach – This chapter covers a journey into microservice development. It navigates the intricacies of synchronous vs. asynchronous communication, elucidates the foundational principles of REST architecture, and delves into the nuances of managing API versioning. The chapter culminates with an exploration of the API-first approach, illuminating its significance in crafting scalable and well-designed microservices. Through a blend of theoretical insights and practical considerations, the reader gains a solid foundation for embarking on the subsequent chapters, setting the stage for a comprehensive exploration of API development in the evolving landscape of microservices architecture. Chapter 2: Reactive REST APIs with Spring WebFlux – This chapter covers the reactive programming paradigm and explains how it differs from traditional approaches. It introduces Spring WebFlux, a powerful framework for building high-performance, nonblocking APIs. You will explore concepts like reactive streams and event loops while creating scalable REST APIs. Practical examples illustrate how reactive programming enhances responsiveness, making applications more efficient in handling concurrent requests. Chapter 3: Easily Scalable APIs with Virtual Threads – This chapter covers the power of Virtual Threads introduced in Java 21 for building highly scalable synchronous APIs. It explains how Virtual Threads revolutionizes concurrency management, making it possible to handle numerous requests efficiently without blocking. The reader will learn to integrate Virtual Threads with Spring MVC, analyze performance benefits, and explore real-world examples of creating scalable, production-ready APIs. Chapter 4: GraphQL with Spring Boot – This chapter covers the fundamentals of GraphQL, an alternative to REST for building flexible and client-focused APIs. It covers GraphQL schema, queries, and mutations, with practical examples using Spring Boot. You will understand how GraphQL enables efficient data fetching, reduces over-fetching and under-fetching, and supports evolving API requirements. By the end, the reader will be equipped to design and implement GraphQL APIs tailored to complex client needs. Chapter 5: Designing APIs with gRPC – This chapter covers gRPC, a high-performance, language-neutral framework for communication between microservices. It explores the use cases, benefits, and implementation of gRPC in a Spring Boot application. The reader will learn how Protocol Buffers work for defining services and messages, and compare gRPC with REST. Practical examples demonstrate how to create scalable, low-latency APIs, making it an essential tool for high-throughput distributed systems. Chapter 6: Asynchronous APIs with Spring Cloud Stream and Apache Kafka – This chapter covers building event-driven APIs for asynchronous communication between microservices. It explains how to use Apache Kafka as a message broker and Spring Cloud Stream for abstracting message processing. The reader will explore patterns like pub/sub and message partitioning. Through hands-on examples, the reader will understand how to implement APIs that handle asynchronous events efficiently. Chapter 7: Centralized Security with Spring Cloud Gateway – This chapter covers how to implement centralized authentication and authorization using Spring Cloud Gateway. It explores OAuth2 and OpenID Connect protocols, integrates Keycloak as an Identity Provider, and configures microservices as OAuth2 clients and resource servers. Chapter 8: Observability and Monitoring – This chapter covers observability and its importance in maintaining reliable APIs. It covers logging, metrics, and distributed tracing using tools like Grafana, Prometheus, and Tempo. The reader will learn to aggregate logs, monitor performance metrics, and trace request flows across microservices. By implementing observability best practices, the reader can quickly diagnose issues, optimize performance, and ensure a seamless user experience. Chapter 9: Deploying Applications on Kubernetes with Kind – This chapter covers the deployment of microservices using Docker and Kubernetes. It focuses on Kind, a lightweight tool for running Kubernetes clusters locally. The reader will explore concepts like Pods, Deployments, and Services, and understand how to manage scaling and networking. Hands-on examples guide the reader through deploying APIs, ensuring they are production-ready and aligned with cloud-native principles.