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Spring Microservices

Spring Microservices

By : V
4.7 (13)
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Spring Microservices

Spring Microservices

4.7 (13)
By: V

Overview of this book

The Spring Framework is an application framework and inversion of the control container for the Java platform. The framework's core features can be used by any Java application, but there are extensions to build web applications on top of the Java EE platform. This book will help you implement the microservice architecture in Spring Framework, Spring Boot, and Spring Cloud. Written to the latest specifications of Spring, you'll be able to build modern, Internet-scale Java applications in no time. We would start off with the guidelines to implement responsive microservices at scale. We will then deep dive into Spring Boot, Spring Cloud, Docker, Mesos, and Marathon. Next you will understand how Spring Boot is used to deploy autonomous services, server-less by removing the need to have a heavy-weight application server. Later you will learn how to go further by deploying your microservices to Docker and manage it with Mesos. By the end of the book, you'll will gain more clarity on how to implement microservices using Spring Framework and use them in Internet-scale deployments through real-world examples.
Table of Contents (12 chapters)
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11
Index

Zuul proxy as the API gateway


In most microservice implementations, internal microservice endpoints are not exposed outside. They are kept as private services. A set of public services will be exposed to the clients using an API gateway. There are many reasons to do this:

  • Only a selected set of microservices are required by the clients.

  • If there are client-specific policies to be applied, it is easy to apply them in a single place rather than in multiple places. An example of such a scenario is the cross-origin access policy.

  • It is hard to implement client-specific transformations at the service endpoint.

  • If there is data aggregation required, especially to avoid multiple client calls in a bandwidth-restricted environment, then a gateway is required in the middle.

Zuul is a simple gateway service or edge service that suits these situations well. Zuul also comes from the Netflix family of microservice products. Unlike many enterprise API gateway products, Zuul provides complete control for the...

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