Book Image

Scala Microservices

By : Selvam Palanimalai, Jatin Puri
Book Image

Scala Microservices

By: Selvam Palanimalai, Jatin Puri

Overview of this book

<p>In this book we will learn what it takes to build great applications using Microservices, the pitfalls associated with such a design and the techniques to avoid them. </p><p>We learn to build highly performant applications using Play Framework. You will understand the importance of writing code that is asynchronous and nonblocking and how Play leverages this paradigm for higher throughput. The book introduces Reactive Manifesto and uses Lagom Framework to implement the suggested paradigms. Lagom teaches us to: build applications that are scalable and resilient to failures, and solves problems faced with microservices like service gateway, service discovery, communication and so on. Message Passing is used as a means to achieve resilience and CQRS with Event Sourcing helps us in modelling data for highly interactive applications. </p><p>The book also shares effective development processes for large teams by using good version control workflow, continuous integration and deployment strategies. We introduce Docker containers and Kubernetes orchestrator. Finally, we look at end to end deployment of a set of scala microservices in kubernetes with load balancing, service discovery and rolling deployments. </p><p></p>
Table of Contents (12 chapters)

Being asynchronous

One cannot spend all day coding. There are quite a few things that humans have to do for survival. Buying groceries is definitely one such mundane task. To make effective use of my time, I usually prepare a list of items I need for my usage over the next couple of weeks. Planning helps so that I can buy everything I need at once, and do not have to revisit the grocery store for repeated buying. Among the list of items, I also wanted a new mechanical keyboard for myself as my dog withered away the USB port from my current keyboard.

Scenario 1 - synchronous

Once I have the list ready, I'll get in my car and go to the closest megastore that usually contains groceries, stationery, electronic items, and...