Event Driven Architecture

The Guide to Event-Driven Architecture

There are several patterns and architectures used in software design. Event-driven architecture is one of these designs. Decoupled apps can concurrently publish and subscribe to events using an event broker, thanks to the architecture’s trend. The majority of businesses have seen progress in many areas because of this architecture. The architecture enables IT professionals to create systems that support authentic information exchange across networked devices, microservices, and applications. As a result, even as activities occur within the business, information is sent between the entities. In most of this architecture’s procedures, an event broker assumes a more significant role. It acts as an intermediary and functions as a basis for loose coupling applications, ensuring that devices may not necessarily be concerned with the sources and destinations of information. Therefore, let’s have a deeper understanding of the architecture and establish why we need it, along with the different cases in which you can apply it. Get set.

Why consider event-driven architecture?

It’s crucial to realize that the ability to respond to or learn more about an event after it occurred deteriorates with time. Real-time information availability is essential for this reason. More business effectiveness is possible when earlier knowledge about specific occurrences is made available. Additionally, it enables fast response to specific events for resource reallocation, customer satisfaction, or a production shift. It is why the event architecture differs from other designs by pushing information as events occur. The event-driven design is more beneficial than regularly waiting for systems to update the information when utilizing the API-led method.

When an event occurs, the architecture delivers the information about it right away to all associated systems and anybody who requires access. Even though the approach seems straightforward, it’s essential to realize that the event goes through many different procedures. For instance, these events and the information they contain must flow through various apps that use various APIs and protocols and run in multiple languages. Such events’ final destination spots are endpoints like analytics engines and user interfaces.

The Benefits of Event-Driven Architecture

Both application users and developers may benefit from the event-driven design in various ways. Due to the architecture, businesses benefit from higher features like agility, scalability, and reactivity.

The architecture has more advanced features with a great capacity to communicate with and react to real-time data. You may also integrate additional services to improve corporate operations and client satisfaction. It is important to remember that this design allows you to take advantage of every event’s occurrence as soon as possible without having to wait, even though there are additional expenses associated with using it.

Everything that occurs downstream with the architecture depends only on the architecture. Thus, you can easily add instances to expand without concern.

Event-Driven Architecture Use Cases

The benefits of event-driven architecture may be apparent in various use scenarios, many of which have unique merits. Regarding the architecture, it is crucial to remember that even a slight modification to the design would significantly impact the overall system. It is essential to constantly be cautious and comprehend how many entities in this architecture operate. Most organizations benefit from the best feature of event-driven architecture—the provision of real-time data—which serves various purposes. As a result, most companies adopt the design into their systems to support many use cases, including:

  • Application to application data sharing
  • Event-enabling microservices
  • Application Integration
  • IoT device networking for data analytics

Common Event-Driven Architecture Concepts 

The event-driven architecture follows certain principles, underlying concepts, and ideas that help in its total operation. Understanding some of these concepts gives you a greater insight into the general process of architecture. It will help you know entities within the architecture and how they link up to each other. Each entity in the architecture performs a given role for the smooth running of the architecture. Let us, therefore, explore a set of concepts associated with architecture.

what is event driven architecture

Event portal

The event-driven architecture’s overall acceptance occurs because of the recognition of its capabilities. However, organizations find it more challenging to record the design process as these appreciations increase. Additionally, it might be tough to comprehend how much a change might impact the system. Event portals are, therefore, helpful in assisting individuals with various tasks, including designing, developing, exploring, sharing, securing, and managing event-driven applications. Architects, developers, and data scientists make up event portals’ three primary audiences.

Command Query Responsibility Segregation (CQRS)

Separating the service responsible for acting as the service responsible for responding to requests is a frequently used technique for expanding microservices. Splitting roles in this fashion makes scaling the query service much easier because you need to react to many more requests than an update or insert.

Event broker

An event broker works in between systems to establish event pathways. For example, publish-subscribe messaging is a technique used by middleware. Every application connected to the network has a connection to the middleware, which acts as an event broker. The event broker receives events from senders and promptly distributes them to all the systems that require them in real-time.

Ensuring every event lands at its designated place requires practical design and management. All these are made feasible by effective communication between the devices sending and receiving events. At this stage, an event portal is essential to record, connect, record, and manage event-driven architecture.

Eventual consistency

The concept of eventual consistency states that you can anticipate an occurrence without necessarily waiting for it to happen. It adheres to different execution strategies. In this situation, you won’t expect the response the event will receive. There is still a chance that a specific database will only catch up to some of what needs to happen. You cannot guarantee that the events will have the same state if there are several state entities. Additionally, no assumption of consistency is made in this case. However, knowing that a particular item will become persistent is crucial as this is the principle guiding the architecture’s operation.

Deferred execution

The fundamental idea behind event-driven architecture is that no more action is necessary once an event is published. The event is kept alive by the event broker until all parties acknowledge it, which could take considerable time. Acting on the original event may lead to the emission of further, equally persistent occurrences.

Event mesh

An event mesh is created and enabled through a network of interconnected event brokers. It’s an event mesh comprising a network of linked event brokers. Thus, the interconnection is a dynamic and adjustable infrastructure layer that distributes events across unconnected apps and gadgets. The event distribution procedure involves dynamically routing events to any specific application without respect to any other factors. In conclusion, an event mesh is the connectivity of event brokers that communicate with one another to pass messages through subscribers.


Developers can use a variety of design architectures while creating new software. With more comprehensive support of outstanding capabilities, the event-driven architecture differentiates from the other architectures. The architecture is beneficial when it is necessary to deconstruct a monolithic architecture because it offers a variety of alternatives that may be used to create more decoupled and scalable systems. To increase resilience and scalability, you may separate your system into independent components thanks to the architecture.

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Written by:

Muzammil K

Muzammil K is the Marketing Manager at Aalpha Information Systems, where he leads marketing efforts to drive business growth. With a passion for marketing strategy and a commitment to results, he's dedicated to helping the company succeed in the ever-changing digital landscape.

Muzammil K is the Marketing Manager at Aalpha Information Systems, where he leads marketing efforts to drive business growth. With a passion for marketing strategy and a commitment to results, he's dedicated to helping the company succeed in the ever-changing digital landscape.