Monolithic vs Microservices Architecture: A Comprehensive Guide
Tags: microservices, webdev, monolithic
Published: 2023-01-04 19:38:16

> Original article: [bracketOrbits](https://devtomars.vercel.app/post/monolithic-vs-microservices-architecture-a-comprehensive-guide-12) 

When it comes to building software applications, there are many different approaches that developers can take. One of the most common debates in the world of software development is the choice between monolithic architecture and microservices architecture.


## What is Monolithic Architecture?

On the one hand, a monolithic architecture is a traditional approach that involves building a single, self-contained application. All of the different features and functions of the application are bundled together in a single codebase, and the application is deployed as a single unit.

A real-world example of a monolithic application is an e-commerce website that includes a shopping cart, a product catalog, a payment gateway, and a customer management system. All of these features are bundled together in a single codebase and deployed as a single unit.

The main advantage of a monolithic architecture is that it is relatively simple to develop and deploy. Because all of the different features and functions of the application are bundled together, it is easy for developers to make changes and updates. In addition, monolithic applications are usually easy to test, as all of the different parts of the application are contained within a single codebase.

## What is Microservices Architecture?

On the other hand, microservices architecture involves building an application as a collection of small, independent services. Each service is responsible for a specific task or function, and the services communicate with each other through APIs.


![microservices](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/6fv0y0f6i0mursh28ylm.png)

A real-world example of a microservices architecture is a ride-sharing app like Uber or Lyft. The app is made up of a collection of services, each responsible for a different aspect of the overall system. For example, there might be a separate service for handling user accounts, another for managing ride requests, and another for handling payment processing.

According to the book "Microservice Patterns" by Chris Richardson, one of the key benefits of microservices architecture is that it allows for more flexibility in terms of technology choices. Each service can be built using the technology that is best suited for its specific task, rather than being limited to a technology stack that is chosen for the entire application.

In addition, microservices architecture allows for more scalability. Because each service is independent, it is easy to add new services or modify existing ones without affecting the entire application.

Microservices architecture is particularly well-suited for applications that are being built to be deployed in the cloud, as it allows developers to take advantage of the flexibility and scalability of the cloud.

## Building an Endpoint Gateway:

One common challenge with microservices architecture is the need to manage multiple endpoints. To address this, it can be helpful to build an endpoint gateway using a technology like GraphQL Apollo. The endpoint gateway acts as a single point of entry for client applications, and it communicates with the various microservices to retrieve the necessary data. 


![graphql endpoint gateway](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/x07165y43vt3hwr2w32n.png)

⁠In this way, the endpoint gateway helps to abstract the complexity of dealing with multiple microservices from the client application.

## Microservices and Databases:

In a microservices architecture, it is common for each service to have its own database. This allows each service to be developed and deployed independently, without the need to coordinate with other services.

However, it is important to carefully consider the trade-offs of using multiple databases. One potential drawback is the need to manage and maintain multiple databases, which can be time-consuming and complex.

## Streaming Services:

In a microservices architecture, it is often necessary to enable real-time communication between services. To facilitate this, it can be helpful to use a streaming service like Kafka or NATS.

- `Kafka` is a distributed streaming platform that allows microservices to communicate with each other in real time. It is particularly well-suited for applications that require high-throughput, low-latency processing. Kafka works by using a concept called "brokers" to manage the flow of data between producers (the microservices that generate data) and consumers (the microservices that process the data). Each broker is responsible for storing and forwarding messages to the appropriate consumers. In this way, Kafka enables real-time communication and data processing between microservices.


![kafka broker](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/r3y9e8c2ud5ejc2wtikj.png)

- `NATS` is another popular streaming service that can be used in a microservices architecture. It is designed to be lightweight and easy to use, making it a good choice for applications that require fast, reliable messaging.

## Deployment Solutions:

When deploying a microservices application, it is important to have a reliable and efficient solution for managing the deployment process. Some popular options for deploying microservices include:

- Containerization: Using containers like Docker allows developers to package an application and its dependencies together, making it easier to deploy and manage.

- Cloud-based deployment platforms: Services like Amazon Web Services (AWS) and Google Cloud Platform (GCP) provide a range of tools and services for deploying and scaling microservices applications in the cloud.

- Continuous delivery and deployment: Automating the deployment process using tools like Jenkins or CircleCI can help to streamline the process and reduce the risk of errors.

## Conclusion:

Monolithic architecture and microservices architecture are two different approaches to building software applications. Monolithic architecture is generally simpler and easier to develop, while microservices architecture is more scalable and flexible. 
The choice between these two approaches will depend on the specific needs of the application being built. By using tools like Kafka or NATS streaming services, building an endpoint gateway with GraphQL Apollo, and choosing an appropriate deployment solution, developers can effectively implement a microservices architecture to meet the needs of their application.