Event-Driven Microservices: Building Scalable and Resilient Systems

In today's fast-paced world, IT systems are producing, gathering, and processing more data than before. Thus, they are dealing with more complex processes as well as integrations that are bringing challenges to the entire enterprise software development team. With the ever-growing technologies and associated frameworks, it is expected that IT systems will be developed in a faster and more cost-effective manner while being highly scalable and resilient.

Well, to achieve this, proficient developers are implementing various architectural styles, algorithms, and programming paradigms which include DevOps, microservices, event driven architecture, and much more. Furthermore, new frameworks and tools are developed to assist the developers in working on these expectations without any hassle.

Now, developers can combine microservices and event-driven architecture to develop IT systems that are not only easily accessible but are highly scalable, resilient, concurrent, and fault tolerant. The process is known as event-driven microservices.

To Know in detail about event-driven microservices, it is important to understand the event-driven architecture.

Event-driven Architecture:

Well, event-driven programming is not an uncommon technique, and it predates the IT system itself. Developers can benefit from the event-driven architecture in serverless architecture and microservices. It helps in developing systems that are loosely connected, dependable, and scalable. The pattern is manageable and extensible. Event driven architecture patterns help in the system development with more availability. For instance, if one component fails to function in this model, the other one continues to work independently. While a typical monolithic system fails to function, it affects the entire model.

In other words, event-driven architecture is dependent on asynchronous non-blocking communication. It happens between the consumers and event producers that produce the resource consumption along with waiting for the response to return. Event driven architecture can also be used with OpenShift and Quarkus.

Introduction to Event-Driven Microservices

In the past few years, event-driven computing and microservices have gained immense popularity. Now, the design patterns of microservices are event-driven and reactive. Thus, they are easy to maintain and update. It is easier to access event-driven microservices in order to develop software applications that are simpler to maintain and highly adaptable over time. Event-driven microservices are also considered when there is a need for the development of responsive applications.

Depending on this, developers can have plenty of microservices that can interact with each other asynchronously. It is expected the applications to be independently maintained and the microservices that can generate the events that can be used by other services. This is where the role of event-driven microservices and event driven architecture patterns come into play.

Patterns Utilized in the Event-Driven Microservices

The patterns utilized in the event-driven microservices architecture are listed below-

• Event stream
• Polyglot Persistence
• Event Sourcing
• CQRS (Command Query Responsibility Separation)

Event Stream: Event streaming architecture shows the events stream through messaging techniques which include, Confluent and Apache Kafka. Consumers of this platform can use events from the streams.

Polyglot Persistence: It is a strategy which is used for data storage in heterogeneous databases. Data can also be safe in diverse formats in the event.

Event Sourcing: It is the commonly used architectural technique that is used to convert monolith architecture into microservices. The state of the application is determined by the set of events that exist in the Event Sourcing pattern.

CQRS (Command Query Responsibility Separation): CQRS (Command Query Responsibility Separation) is another paradigm used to separate the read-and-write model. Furthermore, the insert/update function can easily be handled by this pattern. It helps to improve the scalability, performance, and security of the application.

The Final Thought

In this blog, we have had an insight into event-driven architecture and microservices, how to build the microservices, and the pattern utilized in event-driven microservices through strategic approaches. A well-defined microservices architecture in an enterprise software development can expose the APIs as well as interfaces to produce and consume events for seamless integration with event-driven architecture.