The shift toward event-driven architectures and serverless computing has transformed how modern enterprise applications are built and scaled. Within the SAP ecosystem, the SAP Business Application Studio (BAS) provides a robust, cloud-based development environment for creating such applications, enabling developers to focus on logic rather than infrastructure.
This article explores how to build event-driven serverless applications using SAP Business Application Studio, incorporating SAP BTP services, CAP (Cloud Application Programming) Model, and event-handling mechanisms like SAP Event Mesh.
An event-driven application reacts to events — such as a change in data, a user action, or a system message. In serverless computing, the infrastructure management is abstracted away, and developers deploy small units of functionality (often called functions) that automatically scale and execute in response to events.
SAP Business Application Studio is a next-generation IDE for building full-stack applications in the SAP Business Technology Platform (BTP). It offers tailored development environments for SAP Fiori, CAP, Node.js, and more.
For serverless, event-driven applications, BAS provides:
Create a Dev Space with the following extensions:
Using the BAS terminal:
cds init eventapp
cd eventapp
cds add mta
cds add hana
Define your service and entities in srv/ and db/ folders using CDS (Core Data Services).
SAP Event Mesh enables reliable messaging between services.
Steps:
default-env.json or VCAP_SERVICES.In your CAP service (e.g., srv/event-service.js):
const cds = require('@sap/cds');
module.exports = cds.service.impl(async function () {
const messaging = await cds.connect.to('messaging');
messaging.on('order/created', msg => {
console.log("New Order Received:", msg.data);
// Business logic here
});
});
You can also emit events from your own services:
await messaging.emit('order/processed', { orderId: 123 });
For full serverless capabilities, deploy to SAP Kyma Runtime (Kubernetes-based) or Cloud Foundry Functions:
kubeless or BTP CLI for deploymentImagine a scenario where:
order/created event.order/validated is published.This loosely coupled architecture allows independent scaling and deployment of services.
Developing event-driven serverless applications with SAP Business Application Studio empowers SAP developers to build agile, scalable, and modern enterprise solutions. By combining CAP, Event Mesh, and SAP BTP runtimes like Kyma, developers can create loosely coupled, reactive applications aligned with today’s cloud-native best practices.
Whether enhancing S/4HANA processes or building entirely new services, event-driven architectures in BAS offer a powerful path forward for the intelligent enterprise.