Event-driven architecture is an architectural pattern designed for asynchronous communication. In this model, services communicate by producing and consuming events. An event is a notification that a significant change of state has occurred. The service that generates the event (the producer) sends it to an event broker without knowing which services (consumers) will receive it. Consumers subscribe to the events they are interested in and process them independently. This decouples the partners, allowing them to operate asynchronously, which is ideal for exchanging notifications without waiting for a direct response.

B. Hexagonal design: This pattern, also known as Ports and Adapters, focuses on decoupling the application's core logic from external concerns like databases or UIs, not on the asynchronous communication model itself.

C. Serverless design: This is a cloud execution model where the cloud provider manages the server infrastructure. While often used with event-driven systems, it describes how code is run, not the communication pattern.

D. Request-driven design: This describes a synchronous request-response pattern where a client sends a request and waits for a reply, which is the opposite of the asynchronous requirement.

1. SAP Help Portal

SAP Integration Suite

What Is SAP Event Mesh?: "SAP Event Mesh is a fully managed cloud service that allows applications to communicate through asynchronous events. ... Build event-driven architectures to extend your solution and create a responsive and interconnected application landscape." This document directly links event-driven architecture with asynchronous communication for notifications (events).

2. SAP Help Portal

Cloud Integration

Asynchronous Message Processing: "In an asynchronous scenario

the sender sends a message to the receiver and does not wait for a response message. The sender can continue with its own processing after it has sent the message." This defines the core asynchronous principle that event-driven design implements.

3. SAP Discovery Center

SAP Integration Suite

Service Description: Under the capabilities of SAP Integration Suite

it lists "Event-driven integration" as a key feature. The description states: "Connect applications

services

and systems across different landscapes with events. React to business events in real time and create responsive

event-driven applications." This confirms that event-driven design is the sanctioned SAP approach for this use case.