Book Image

Building Serverless Architectures

By : Cagatay Gurturk
Book Image

Building Serverless Architectures

By: Cagatay Gurturk

Overview of this book

Over the past years, all kind of companies from start-ups to giant enterprises started their move to public cloud providers in order to save their costs and reduce the operation effort needed to keep their shops open. Now it is even possible to craft a complex software system consisting of many independent micro-functions that will run only when they are needed without needing to maintain individual servers. The focus of this book is to design serverless architectures, and weigh the advantages and disadvantages of this approach, along with decision factors to consider. You will learn how to design a serverless application, get to know that key points of services that serverless applications are based on, and known issues and solutions. The book addresses key challenges such as how to slice out the core functionality of the software to be distributed in different cloud services and cloud functions. It covers basic and advanced usage of these services, testing and securing the serverless software, automating deployment, and more. By the end of the book, you will be equipped with knowledge of new tools and techniques to keep up with this evolution in the IT industry.
Table of Contents (10 chapters)

Creating User Service

We will now start implementing our first service, User Service. In the beginning, we will only implement a method that returns a User object for a given token string. If a user can't be found in the repository, the method will return UserNotFoundException, which should be caught by the AWS Lambda function and translated into the decline policy.

We can start implementing our User Service in the way we already know. Let's add our new module's name to the settings.gradle file using a simple echo command:

    $ echo "include 'services-user'" >> settings.gradle

Create the required folder using the following command:

    $ mkdir -p services-user/src/main/java/com/serverlessbook/services/user 

It is a good time to create a User object for our project now. The User class will have the ID, email, and username properties,...