Note
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Example
You can find a full walkthrough into quickly creating a CDS service here
SAP Capire, also known as the SAP Cloud Application Programming Model (CAP), is a framework designed to accelerate the development of enterprise-grade services and applications2. It provides developers with a set of languages, libraries, and tools that follow best practices for building cloud-native applications.
Core Concepts
Service-Centric Paradigm
CAP applications are built around services defined in CDS (Core Data Services) models4. These services encapsulate the behavioral aspects of a domain, including exposed entities, actions, and events.
Event-Driven Architecture
CAP uses a ubiquitous event model, treating both synchronous API requests and asynchronous event messages uniformly4. This approach simplifies the handling of various types of interactions within the application.
Domain Modeling
Developers start by capturing essential domain objects in a domain model using CDS1. This allows for a clear representation of the application’s data structure and relationships.
Key Features
Automatic Request Handling
CAP provides generic implementations for many common tasks, reducing boilerplate code and accelerating development2. This includes features like:
- Implicit pagination
- Input validation
- Authentication and authorization
- Localization and internationalization
- Concurrency control
Database Support
Out-of-the-box support is provided for various databases, including SAP HANA, SQLite, H2 (Java only), and PostgreSQL1.
Multitenancy
CAP offers built-in support for developing multitenant applications, which is crucial for SaaS solutions1.
Extensibility
The framework provides intrinsic capabilities for extending applications in verticalization and customization scenarios1.
Development Workflow
- Project Initialization: Developers can quickly start a new project using CAP’s tools5.
- Domain Modeling: Define the data model using CDS language1.
- Service Definition: Create services that expose the domain model, often as projections or views4.
- Implementation: Add custom logic to service handlers as needed4.
- Testing: Utilize CAP’s support for local development and testing, including mocks for platform features4.
- Deployment: Deploy the application to various environments, with easy configuration changes for production settings1.
Language Support
CAP provides support for both Node.js and Java development:
- Node.js: Offers a comprehensive SDK for building CAP applications5.
- Java: The CAP Java SDK enables Java developers to build CAP applications, integrating well with Spring Boot5.
Integration and Extensibility
CAP facilitates integration scenarios by allowing developers to import APIs from other systems (e.g., SAP S/4HANA) and run local mocks2. It also supports consuming remote services through a unified API6.
Conclusion
SAP Capire (CAP) empowers developers to build robust, scalable, and maintainable enterprise applications with reduced complexity. By providing a comprehensive framework that handles many common tasks automatically, CAP allows developers to focus on business logic and domain-specific requirements, significantly accelerating the development process.