Why Use Event Driven Architecture

Event-driven architecture (EDA): Overview

Event-driven architecture (EDA) is a software pattern that uses data flow, queues, and related event-driven technology to manage and control data processing. It is based on the idea of events being triggered, which cause other events to occur. In essence, EDA is a decentralized approach to communication between different components or nodes within a distributed system, such as applications, services, and databases. Moreover, it enables all components within the system to act independently without relying on direct communication with each other. This makes EDA an efficient means of managing communication and data, while enhancing scalability and performance of applications.

Background: Traditionally, Sequential Processing

Before EDA was available, systems relied on sequential processing. This method of processing structured data was limited in its ability to scale. Sequential processing involves data processing in a single stream, meaning, data is processed one step at a time. This limited scalability has caused problems, particularly in larger systems with more complex needs. As a result, systems had to be redesigned and/or rewritten to meet increasing demands.

EDA: Managing Data Through Events

EDA takes advantage of the inherent scalability provided by distributed systems. In EDA, events are posted and shared, allowing all the components within the system to listen for and react to data events. This means that data does not need to be processed in a single stream. Instead, the data is processed in parallel and asynchronously, meaning that multiple processes can happen independently of one another and at different times, resulting in large performance gains. Moreover, because the order of data processing is independent from the data itself, EDA systems are able to process data much faster.

Reasons to use Event Driven Architecture

  • Simplicity: One of the key advantages of using EDA is its ability to simplify complex systems. In traditional systems, all the components in the system must be tightly coupled since they share the same data and are required to be constantly in sync. Because of this, these systems are often not scalable and can be difficult to maintain. With EDA, each component is independent and only needs to collaborate with other components when data is posted, meaning that the system is less complex.
  • Flexibility: Since EDA does not require a sequential processing system, it allows for much greater flexibility. This allows changes to be made to the system without having to completely rewrite it, and enables new applications to be added easily. Additionally, the system can be changed quickly and easily in response to changes in the environment.
  • Scalability: As mentioned above, EDA is inherently scalable. This is because data is processed in parallel, meaning that each component does not need to wait for the others to process data. This makes it much easier to add additional components or make changes to existing components.
  • Performance: As data is not processed in a single stream, performance is greatly improved. This is because data can be processed in parallel and asynchronously, meaning that two processes can be happening at the same time without being dependent on one another. EDA also enables components to ‘skip’ or ‘ignore’ data they do not need, which also improves performance.

Why Event Driven Architecture is Ideal for Microservices

EDA is particularly useful in the context of microservices. A microservice is an individual service that is used to provide functionality within a system. These services are typically independent of one another and have to communicate with each other in order to function properly. Therefore, a highly efficient communication strategy is needed. With EDA, data can be processed in parallel and independently of each other, allowing for much greater scalability and performance.

Advantages of Using EDA for Building Reactive Systems

EDA is a great way to build reactive systems. A reactive system is a system that responds to changes in its environment. In traditional systems, any changes must be done in a sequential fashion, meaning that changes can take a long time to implement. With EDA, changes can be made in parallel and quickly, allowing reactive systems to respond to changes much more quickly.

Cost of Event Driven Architecture

The cost of using EDA will depend on the complexity and scale of the system. While EDA can be much more efficient and scalable than traditional systems, it can also be much more expensive to maintain and develop. EDA is a complex approach and requires a great deal of expertise to implement. Additionally, it may require more computing power and storage in order to meet scalability requirements. Therefore, it is important for companies to carefully consider costs before deciding to use EDA.

Learning and Adopting EDA

There are a number of resources available to help companies learn and implement EDA. Companies should first understand the basics of EDA by reading up on the subject, and then move on to implementing EDA in practice. There are a number of different tools available to help with implementing EDA, such as message brokers and queues. Additionally, companies should consider consulting with an expert on EDA in order to ensure successful implementation.

EDA in the Cloud

EDA is increasingly being used in cloud-based systems. Because cloud-based systems are inherently distributed, EDA is the ideal method for managing the data in these systems. Additionally, EDA enables cloud-based systems to be more scalable, flexible, and able to respond to changes in the environment. As more and more companies move to the cloud, EDA will become increasingly important.


Event-driven architecture is a powerful and efficient way to manage data in distributed systems. It is a great way to simplify complex systems, increase scalability and performance, and build reactive systems. Although EDA can be expensive to develop, the benefits far outweigh the costs. Ultimately, EDA is an ideal solution for companies who want to build efficient and scalable systems.

Anita Johnson is an award-winning author and editor with over 15 years of experience in the fields of architecture, design, and urbanism. She has contributed articles and reviews to a variety of print and online publications on topics related to culture, art, architecture, and design from the late 19th century to the present day. Johnson's deep interest in these topics has informed both her writing and curatorial practice as she seeks to connect readers to the built environment around them.

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