What is event sourcing in Microservices?

Event sourcing persists the state of a business entity such an Order or a Customer as a sequence of state-changing events. Whenever the state of a business entity changes, a new event is appended to the list of events. Since saving an event is a single operation, it is inherently atomic.

What is event sink in Microservices?

Overview. The Assure1 Event Sink microservice is part of the microservice event pipeline. The Event Sink is responsible for taking events that have been normalized and inserts them into the Event database.

Why is event driven architecture used?

Event-driven architectures are ideal for improving agility and moving quickly. They’re commonly found in modern applications that use microservices, or any application that has decoupled components. Your event source should be reliable and guarantee delivery if you need to process every single event.

When a microservice publishes an event when something notable happens and other microservices subscribes to those?

Event-Driven Architecture. For many applications, the solution is to use an event-driven architecture. In this architecture, a microservice publishes an event when something notable happens, such as when it updates a business entity. Other microservices subscribe to those events.

How would you implement event-driven in microservices?

To create an event-driven microservice structure, we can simply create a RabbitMQ cluster with persisted messages. All needed events can be published via the service-in-responsibility. Also, all the other services can bind their consumers and process their works when event messages are sent.

Can Event-Sourcing be used in microservices architecture?

Though these types of transactions can be handled by distributed transaction management, this is not recommended in a microservices approach, as there might not be support for XA transactions in all scenarios. To avoid these limitations, event-sourcing can be introduced in this microservices architecture.

What is event sourcing-based business logic?

Event sourcing-based business logic consists of loosely coupled business entities that exchange events. This makes it a lot easier to migrate from a monolithic application to a microservice architecture. It is a different and unfamiliar style of programming and so there is a learning curve.

What are the advantages of using Event Sourcing?

Event sourcing has several benefits: It solves one of the key problems in implementing an event-driven architecture and makes it possible to reliably publish events whenever state changes. Because it persists events rather than domain objects, it mostly avoids the object‑relational impedance mismatch problem.

What are the advantages of CQRS integrated with Event Sourcing and Microservices?

The advantages of CQRS integrated with event sourcing and microservices are: Leveraging microservices for modularity with separate databases. Leveraging event sourcing for handling atomic operations. Maintain historical/audit data for analytics with the implementation of event sourcing.