Event-driven communication and Sagas with state

Event-driven communication and Sagas and state refer to software and system development concepts, particularly within the realm of microservices architecture.

Event-driven communication

Event-driven communication is a communication paradigm between software components where one component changes its state and emits an event to notify other components. The advantage of this communication model is that it helps reduce system connectivity and enhances reactivity, scalability, and flexibility.

A use case of event-driven communication is that in a distributed system of microservices, event-driven communication is valuable for loosely coupling services and enabling asynchronous, real-time interactions.

For instance, in an e-commerce system, when a user places an order, the order service might publish an OrderPlaced event. The inventory service and payment service, which are interested parties, can subscribe to this event and take...