Introduction of Microservices

Microservice architecture is a distinct technique of designing software systems to structure a single application as a collection of loosely coupled services. Thereby, microservices are a group of modular services that perform together to make the entire application effective in the process of execution. 

Purpose of Microservices

Microservice applicatication has an independent component and various services in order to be deployed and updated independently, which enhances flexibility. Microservices application affects a particular service; it does not reflect the whole solution. Whereas Microservice architecture is apt for developing a large application with multiple modules and it would be the best way to handle it. 

Before discussing the features of microservices architecture, Let us analyse the monolithic architecture first. 

Monolithic Architecture

The monoliths are ancient and more traditional in building applications. It is also an architectural pattern of designing and developing a complete application as a single unit. Every module/feature of a monolith is centralized. 

In the above diagram, there are different components combined into a single program on a single platform. Monolith architecture contains all features of the application. 

• > Client - Responsible for displaying UI and making HTTP requests to the server. 

• > Router - Responsible for handling HTTP requests and redirects to the particular feature implementation based on URL. 

• > Feature - Responsible for doing application business logic. 

• > Database - Responsible for storing data. 

Microservice Architecture

It is an application built on microservices architecture that splits up each part of the application into an independent application that performs one specific task. Therefore each component can be performed independently from the other modules.

These modules communicate with each other through an Application Programming Interface (API) in order to create the full functionality of an application.

In the above diagram, there are different components combined into a multiple program (service) from a single platform. A single microservice contains only one feature of the application. 

• > Client - Responsible for displaying UI and making HTTP requests to the server. 

• > API Gateway - Responsible for handling HTTP requests and authentication, request routing, monitoring and so on. 

• > Service - Responsible for maintaining single feature business logic. 

• > Router - Responsible for redirecting to the particular feature implementation based on URL. 

• > Feature - Responsible for doing application business logic. 

• > Database - Responsible for storing data. 

COMPARING MONOLITHIC AND MICROSERVICE APP

Let us see the app implementation in Monolithic architecture. 

BUILD MONOLITHIC ARCHITECTURE APP IN NODE-JS

Code

In the above code, Monolithic architecture is being used. This app is used to give individual posts and comments for some common things. This app contains both modules like Posts and comments in the same server/service.

We can interact with servers very quickly with the help of Monolithic techniques.  

Output

If one of the modules gets an error or network issue from the server end the total app will not work properly. It reflects the total app performance. We could not get an expected output in an error module.

Because posts and comments modules can be performed by a single server/service in monolithic architecture. Consequently we could not add comments in the app after an error got from the posts module.

If any one of the modules affects the same is reflected back to the whole app performance and also the output. 

This is the biggest disadvantage in monolithic architecture or single service architecture.

Let's see the app implementation in Microservices architecture. 

BUILD MICROSERVICE ARCHITECTURE APP IN NODE-JS

Code

Posts service

Comments service

In the above code, we used Microservice architecture. This app is enabled to give individual posts and comments for some common display. This app contains both Posts and comments modules in the different servers/services.

We can interact with each service in the app rapidly. Because every module will perform an individual service. 

Output

If any one of the modules gets an error or network issues from the server side the total app will not be affected. It does not reflect on the total app performance. We could get expected output in an error free module. Because posts and comments modules can be performed by multiple servers/services. 

Accordingly we could add comments in the app after an error from the posts module. If any one of the modules affects, it would not be reflected in the whole app performance and output.

This is the biggest advantage in Microservice architecture. 

Conclusion

Employment of Microservice architecture has huge benefits such as the improvement of app performance and distribution service approach are planned to overcome the constraint of traditional monolithic architectures.

Microservice architecture provides multi varied positive impacts by acquiring a divide and conquer approach to software design.