Microservice Architecture
5 min read

Event Driven Microservices with Spring Boot

By Unni MohanJuly 27, 2022, 3 p.m. Application development company
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A majority of the big corporations in the world are going the microservices way. Microservices are small independent but interconnected services that make up an application. This is unlike the earlier approach, when companies functioned with a single larg

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Building an event-driven and reactive asynchronous system using the Spring Boot framework is a new strategy being followed for application development.

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There are many programming paradigms: procedural, object-oriented, functional, event-oriented, etc., and each has its own advantages and disadvantages. In Java, a major part of the programming done is object-oriented as the language itself is object-oriented. Now, what do you do if there is a need for event-driven programming or implementing a part of some functionality as event-driven? 

Event-driven programming helps you decouple the logic from the event source. For example, if you are required to send an email to a user as and when they register, you can choose the event-driven implementation option by transferring the emailing part alone into "a listener" that caters to the "register" event. Spring Boot provides you with this functionality by way of Spring Events.

What is Event-Driven in Spring Boot

Event-driven systems are a reflection of the way modern businesses work. Thousands of small changes keep happening every day. The Spring framework has the capability to handle events. This enables developers to build applications around them. This means that your applications will remain synchronized with your business. Spring offers several event-driven options for developers to choose from integration and streaming to data flows and cloud functions.

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Actually, event streaming uncovers exciting opportunities. One example is event-driven architecture. This is to say that the Spring framework simplifies the way events are produced, processed, and consumed, providing many useful abstractions. Another example is streaming data, which represents a continuous flow of events. In the case of stock tickers, a new event gets created every time the price changes. Yet another example is message handling, the bedrock of all event-driven systems. Spring helps you solve integration challenges quickly by connecting to messaging platforms, routing messages, processing messages, and transforming messages.

Direct method calls and events are used for different situations. In the case of a method call, the assertion is that regardless of the state of the receiving and sending modules, they have to be aware of the events that happen.

On the other hand, with events, we just have to notify the occurrence of an event. It is not necessary to notify any module. As such, it is good to make use of events when the processing has to be passed on to another thread (for example, sending an email on the completion of a task). Also, events are useful in the case of test-driven development.

Read our blog “Event–Driven Architecture - Fundamental for Digital Transformation”.

Spring events enable throwing and listening to specific application events and processing them as per requirement. Events enable the exchange of information between components that are loosely coupled. The absence of a direct coupling between subscribers and publishers enables subscriber modifications without impacting the publishers and vice-versa. 

Event-Driven Architecture

Event-driven programming is nothing new, and it is possible to take advantage of the event-driven architecture in both microservices and serverless architectures. The event-driven architecture helps you develop dependable, scalable, and loosely connected systems. This kind of design is not only extensible but also manageable. Furthermore, event-driven architectures are helpful in the development of high-reliability systems. The advantage is that all systems except the one that has failed continue to function normally in the case of an event-driven architectural model. In contrast, the failure of a component can lead to the failure of others in the case of a monolithic application.

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Event-Driven Microservices

In recent times, the popularity of event-driven computing and microservices has been on the rise. Modern microservices follow a reactive and event-driven design. As the microservices are loosely connected, it is simple and easy to update and maintain them. Event-driven microservices can be used to create applications that are adaptable and easy to maintain.

For example, consider this scenario: You have many microservices and they have to interact with each other asynchronously. You may also want each service to be scalable and maintained independently. Moreover, you may want the microservices to generate events for the consumption of other services. This is the scenario where event-driven microservices would be of great help. A microservice created in an event-driven architectural model broadcasts an event as and when some important action is performed or something specific happens. 

Read our blog : How Retail is Adopting Microservices

LinkedIn and Netflix are good examples of event-driven, asynchronous communications architecture use cases. Event-driven microservices can be used to perform business transactions that often span many services. Furthermore, event-driven microservices are helpful in building responsive applications. Besides, all alerts are queued prior to being forwarded to appropriate users in the case of an event-driven model. In such a situation, users need not wait when the processing of a notification (an email, text message, etc.) is happening. Users may continue to utilize the application when the notification is being processed asynchronously.

Spring Boot for Microservices

The open-source microframework Spring Boot can be employed for building Spring applications using microservices. It may be used for building standalone Java applications and traditional WAR deployments. With Spring Boot, developers can start coding right away as there is no need to prepare or configure the environment. Furthermore, Spring provides flexible XML configurations, database transactions, robust batch processing, easy workflow, and a wide range of development tools.

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Besides, Spring offers default codes and configuration annotation that enable you to instantly start a new Spring project quickly. As it follows the ‘Opinionated Defaults Configuration’ strategy, it eliminates the need for boilerplate and other configurations. This improves development, unit testing, and integration testing procedures. All said and done, Spring Boot is a great framework for microservices-based application development.

How SayOne can Help

At Sayone, we design and implement microservices systems that do not have complex architectural layers, and this enables the services to deliver exceptionally fast performance. Moreover, we provide services that are significantly decoupled, allowing you to launch independent services and not end up with the usual inter-dependent microservices that work more or less like a monolith.

We design the microservices keeping in mind the margin required to allow for the transitioning into the new system of your organization’s legacy architecture as well as expanding into the cloud system. Our microservices comprise lightweight code and we provide competitive pricing options for our clients.

Our microservices are built according to the latest international security guidelines that ensure the complete safety of all the data. We also ensure that we deliver the services within stipulated deadlines and we always assure a quick turnaround time for our clients. Equipped with the best infrastructure and the latest tools and technologies, our expert developers will provide you with the best microservices that are easily scalable, enabling a good ROI in the shortest period of time.

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