Overcoming Front-End Back-End Coupling with AWS Event-Driven Architecture
Tags: aws, lambda, serverless, eventdriven
Published: 2023-04-15 04:15:49

## introduction

> As a developer, I've always been interested in event-driven architectures (EDAs) and how they can improve the overall performance and scalability of web applications. However, I never truly understood the power of EDAs until I faced a real problem with a project I was working on.

The project was a web application that required real-time updates to be displayed on the user interface. Users needed to be able to see changes made by other users in real-time without having to manually refresh the page. Initially, I implemented a solution that involved continuously polling the server for updates, but this approach was not only resource-intensive, but it also led to a slow and unresponsive performance.

It was then that I realized that what I needed was an EDA that would allow me to send real-time updates to the front-end without continuously polling the server. I knew that this would require a lot of work and was unsure where to start.

That's when I decided to turn to AWS, a cloud computing platform that offers a wide range of serverless services, including AWS Lambda, AWS API Gateway, and AWS SNS. These services would allow me to build a scalable and efficient EDA that would work seamlessly with my front-end application.

## How AWS Serverless Services Helped Me Build an EDA

I started by using AWS Lambda, a serverless compute service that lets you run your code without provisioning or managing servers. With Lambda, I could write a function that would be triggered whenever an event occurred. I wrote a function that would be triggered whenever a user made a change to the application. The function would then send a message to an SNS topic using the AWS SNS service.

AWS SNS, or Simple Notification Service, is a fully managed pub/sub messaging service that enables you to send messages to multiple recipients at once. With SNS, I could create a topic and subscribe to all the clients that needed to receive real-time updates to that topic. Whenever a message was sent to the topic, SNS would automatically distribute it to all subscribed clients.

To connect the front-end application to the AWS SNS service, I used AWS API Gateway, a fully managed service that makes it easy to create, deploy, and manage APIs at any scale. With API Gateway, I created an endpoint that would receive messages from the SNS topic and send them to the connected clients using web sockets.

## Benefits of Using AWS Serverless Services to Build EDAs

There are many benefits to using AWS serverless services to build EDAs. These benefits include:

- **Scalability:** AWS serverless services are designed to scale automatically with demand. This means that you don't have to worry about provisioning or managing servers, and you can focus on building your application.
- **Reliability:** AWS serverless services are highly reliable and are designed to be highly available. This means that your application will be available even if there are problems with individual servers or regions.
- **Cost-effectiveness:** AWS serverless services are very cost-effective. You only pay for the resources that you use, and you don't have to worry about upfront costs or long-term commitments.

## The Result

The result was a highly scalable and efficient EDA that allowed real-time updates to be sent to the front-end application without continuously polling the server. The front-end application was now highly responsive and provided an excellent user experience.

## In Conclusion

Event-driven architectures have become a crucial aspect of modern web development, and using AWS serverless services has made it easier than ever to build highly scalable and efficient EDAs. By leveraging services like AWS Lambda, AWS SNS, and AWS API Gateway, developers can build highly responsive and scalable web applications that provide an excellent user experience.

To those who are considering implementing an EDA, I highly recommend exploring AWS serverless services. With a little bit of effort and some knowledge of these services, you can build highly efficient and scalable EDAs that will take your web development projects to the next level.