Microservices Architectures - Non Functional Requirements - Maintainability


NEW COURSE RELEASED! - 21 HOURS, 200+ VIDEOS - Master DevOps with Docker, Kubernetes and Azure DevOps


In this article, we explore the important non functional requirement called Maintainability.

What you will learn

  • What Is Maintainability?
  • Why is Maintainability important?
  • How do you improve Maintainability of your system?

Free Courses - Learn in 10 Steps

Non Functional Requirements and Microservices

This is the part of a series of articles on Non Functional Requirements:

What Is Maintainability?

Requirements for a Software Applications often change. When you develop an application, you want to be able to easily enhance it easily in the future.

This could also be in the form of providing fixes to important bugs that are detected over time.

Technically speaking, what we call maintainability is typically two things

  • Maintainability
  • Extensibility

Maintainability

Maintainability is all about how easy it is to fix a bug found in the application.

Extensibility

Extensibility of a system describes how easy it is to incorporate new features into it.

Both these concepts are quite deeply related, and are clubbed together under a single umbrella - maintainability. That’s how we address them as well.

Enhancing Maintainability

The maintainability of an application can be enhanced by following some important guidelines.

Have Great Low-Level Design

It is very important for your application have great low-level design, in order to be maintainable.

Adhering to 4 Principles of Simple Design is a great starting point.

Test Driven Development (TDD) usually leads to great tests and great low level design. With TDD, you first write tests and then write code to make these tests pass. The code is continuously refactored to meet 4 principles of simple design.

Ensure Modular Design

Have a look at the following microservices architecture:

image info

Each of these microservices use common infrastructure components, such as Naming Service and API Gateway. It also makes use the features of common technical components, such as Security and Logging.

Having common components and infrastructure enable the microservices to focus on their specific responsibilities.

If Microservice1 has a need for user authentication or authorization, it interacts with the Security component through a well defined interface. Security component takes care of the inner implementation details.

As Microservice1 has lesser things to take care of, it becomes more maintainable.

In addition, it becomes easier to add additional microservices to the system at a later point in time.

Ensure Great Automation Tests

It is important that all the unit, system, integration and API tests are of good quality, and equally important, are automated. Ideally, they need to be part of a Continuous Integration (CI) process, that is invoked whenever code is committed to the source repository.

The idea is to have immediate feedback on application reliability, while removing the dependency on manual testing.

Automate The Deployment Pipeline

With an automated deployment pipeline, the build moves through different stages such as development, QA, staging and production in a systematic and efficient manner.

Greater Visibility

Greater visibility of code across the modules in the system makes it easier to detect bugs, and shorten the time line in addressing them.

Having great traceability across microservices in a microservices architecture helps us understand what’s happening in the background with a specific request

  • Which microservices are involved?
  • What are the requests and responses?
  • How much time was taken at each hop?

image info

Summary

In this article, we took a closer look at maintainability. We saw that it is a measure of two things : the amount of effort needed to fix bugs in the system, and the amount of effort needed to incorporate additional features into the application (also called extensibility).

We then looked at a few ways to enhance the maintainability of an application. The important ones are to have good low-level design, ensure a modular architecture, be equipped with great automation tests, have good system visibility.

What to Learn Next?

NEW COURSE RELEASED! - 21 HOURS, 200+ VIDEOS - Master DevOps with Docker, Kubernetes and Azure DevOps


350,000 Learners are learning everyday with our Best Selling Courses : Spring Boot Microservices, Spring, Spring Boot, Web Services, Hibernate, Full Stack React, Full Stack Angular, Python, Spring Interview Guide, Java Interview, Java Functional Programming, AWS, Docker, Kubernetes, PCF, AWS Fargate and Azure


85,000 Subscribers are learning from our Free Videos on YouTube : JSP Servlets, Spring, Spring Boot, Spring MVC, Hibernate, Eclipse, Maven, JUnit, Mockito, Full Stack - React, Full Stack - Angular, Docker, Kubernetes, AWS, AWS Fargate, PCF and Azure


Here are the recommend articles to read next : Spring Interview Questions, Spring Boot Interview Questions, Microservices, Hibernate, Spring Security, REST API with Spring Boot, Full Stack with React, SOAP Web Services, Exception Handling, Embedded Servers, Spring Data Rest, Spring vs Spring MVC vs Spring Boot, Building Web Application and Spring Data JPA. You can checkout all our 100+ articles here - All Articles.


Do not know where to start your learning journey? Check out our amazing learning paths: Learning Path 01 - Spring and Spring Boot Web Applications and API Developer, Learning Path 02 - Full Stack Developer with Spring Boot, React & Angular, Learning Path 03 - Cloud Microservices Developer with Docker and Kubernetes, Learning Path 04 - Learn Cloud with Spring Boot, AWS, Azure and PCF and Learning Path 05 - Learn AWS with Microservices, Docker and Kubernetes


Related Posts

Docker Tutorial for Beginners - with Java and Spring Boot

Learn about Docker - What is Docker? Why Is Docker Popular? How to create Docker Image for a Java Spring Boot App?

Devops Tutorial | DevOps with Docker, Kubernetes and Azure DevOps

What is DevOps? How is it different from Agile? What are the popular DevOps Tools? What is the role of Docker, Kubernetes and Azure DevOps in DevOps. Let's get started with a simple usecase.

Deploy Java Spring Boot Applications to AWS, Azure, GCP with Docker and Kubernetes

In this article, we focus our attention on the cloud. How to learn the cloud and deploy Java Spring Boot Applications to AWS, Azure, GCP with Docker and Kubernetes?

Microservices Architectures - Non Functional Requirements - Performance

In this article, we explore an important non functional requirement called performance.

Spring Boot Tutorials for Beginners

At in28Minutes, we are creating a number of tutorials with videos, articles & courses on Spring Boot for Beginners and Experienced Developers. This resources will help you learn and gain expertise at Spring Boot.

Microservices with Spring Boot and Java - Part 1 - Getting Started

Let's learn the basics of microservices and microservices architectures. We will also start looking at a basic implementation of a microservice with Spring Boot. We will create a couple of microservices and get them to talk to each other using Eureka Naming Server and Ribbon for Client Side Load Balancing. In part 1 of this series, lets get introduced to the concept of microservices and understand how to create great microservices with Spring Boot and Spring Cloud.

20+ Spring Boot Projects with Code Examples

At in28Minutes, we have created more than 20 projects with code examples on Github. We have 50+ articles explaining these projects. These code examples will you learn and gain expertise at Spring Boot.

REST API Best Practices - With Design Examples from Java and Spring Web Services

Designing Great REST API is important to have great microservices. How do you design your REST API? What are the best practices?

Index - 500+ Videos

At in28Minutes, we are creating a number of tutorials with videos, articles & courses on Spring Boot for Beginners and Experienced Developers. Here's a list of video tutorials and courses for you