CAPM

Question 1

What is CAPM

Answer 1

The SAP Cloud Application Programming Model (CAP) is a framework of languages, libraries, and tools for building enterprise-grade services and applications. It guides developers along a ‘golden path’ of proven best practices and a great wealth of out-of-the-box solutions to recurring tasks.

Question 2

CAP places primary focus on domain, by

Answer 2

capturing domain knowledge and intent instead of imperative coding — that means, What, not How — thereby promoting:

Close collaboration of developers and domain experts in domain modeling.
Out-of-the-box implementations for best practices and recurring tasks.
Platform-agnostic approach to avoid lock-ins, hence protecting investments.

Question 3

What is the backbone of language of CAPM

Answer 3

CDS

Question 4

What does Domain Models capture?

Answer 4

static aspects of problem domains as well-known entity-relationship models.

Question 5

What are Associations

Answer 5

capture relationships.

Question 6

What are Compositions

Answer 6

extend that to easily model document structures.

Question 7

What are Annotations

Answer 7

allow enriching models with additional metadata, such as for UIs, Validations, Input Validation or Authorization.

Question 8

What are Aspects

Answer 8

allow to flexibly extend models in same or separate modules, packages, or projects; at design time or dynamically at runtime.

Question 9

What is an example of separation concerns

Answer 9

// Separation of Concerns
extend Books with @restrict: [
{ grant:’WRITE’, to:’admin’ }
];

Question 10

What is an example of Verticalization

Answer 10

// Verticalization
extend Books with {
ISBN : String
};

Question 11

/What is an example of Customization

Answer 11

// Customization
extend Orders with {
customer_specific : String
};

Question 12

What is Core Query Language (CQL)

Answer 12

CQL is CDS’s advanced query language. It enhances standard SQL with elements to easily query deeply nested object graphs and document structures.

Question 13

What is an example of CQN in JavaScript language

Answer 13

// In JavaScript code
orders = await SELECT.from (Orders, o=>{
o.ID, o.descr, o.Items (oi=>{
oi.book.title, oi.quantity
})
})

Question 14

All behavioral aspects in CAP are based on ubiquitous notions of Services and Events, as expressed in this manifest:

Answer 14

1. All active things are Services — local ones, remote ones, as well as databases
2. Services are declared in CDS — reflected and used in generic service providers
3. Services provide uniform APIs — consumed by other services or frontends
   4.Services react on Events — covering synchronous and asynchronous APIs
4. Services consume other Services — in event handler implementations
5. All data is passive — that is, without its own behavior, adhering to REST

Question 15

Are Services in CAPM stateless

Answer 15

True

Question 16

Where are services declare

Answer 16

in CDS models, used to serve requests automatically. They embody the behavioral aspects of a domain in terms of exposed entities, actions, and events.

Question 17

Provide an example of service definition

Answer 17

// Service Definition in CDS
service OrdersService {
entity Orders as projection on my.Orders;
action cancelOrder (ID:Orders.ID);
event orderCanceled : { ID:Orders.ID }
}

Question 18

Every active thing in CAP is a service, including local services or remote ones — even databases are represented as services. provide an example

Answer 18

// Consumption in JavaScript
let srv = cds.connect.to(‘OrdersService’)
let { Orders } = srv.entities
order = await SELECT.one.from (Orders)
.where({ ID:4711 })
srv.cancelOrder (order.ID)

Question 19

What is domain modelling

Answer 19

Most projects start with capturing the essential objects of their domain in a respective domain model. Find here an introduction to the basics of domain modeling with CDS, complemented with recommended best practices.

Question 20

What is providing servicdes

Answer 20

This guide introduces how to define and implement services, leveraging generic implementations provided by the CAP runtimes, complemented by domain-specific custom logic.

Question 21

What is consuming services

Answer 21

Learn how to use uniform APIs to consume local or remote services.

Question 22

What is the capture intent philosophy

Answer 22

Capture Intent — What, not How!

Question 23

What is ERM

Answer 23

Entity Relationship Model

Question 24

What are the uses of the domain models

Answer 24

They serve as the sources for persistence models, deployed to databases, as well as the underlying model for services acting as API facades to access data.

Question 25

What is Node.Js

Answer 25

It is a JavaScript runtime, or an environment that allows us to execute JavaScript code outside of the browser. A “runtime” converts code written in a high-level, human-readable, programming language and compiles it down to code the computer can execute.