README.md

Business Technology Platform Services Overview

This application provides a matrix of all the SAP Business Tehchnology Platform Services (services, regions, plans).

- Running the application -

To run the application, execute the following commands

npm i (in root and both app dirs)
npm run build (in recap.capadvancedprogrammingmodel.btpservices dir)
npm run demo (in root dir)

If the application won't start, make sure that the "uri" property of the datasource in the manifest.json file of the 'recap.capadvancedprogrammingmodel.btpservices' application starts and ends with a /.

- reCAP code snippet -

During reCAP 2023 event the following code snippet will be used during the live presentation CAP Advanced Programming model.

DiscoveryCenterService.ts

Attributes and constructor:

private readonly entityName: string = "Services";
private readonly entityNameDetails: string = "GetServicesDetails";

constructor() {
    super("DISCOVERY_CENTER_API");
}

getServices method:

public async getServices(): Promise<Array<IDiscoveryCenterEntity>> {
    return (await this.cdsService.get(`/${this.entityName}`) as unknown as Array<IDiscoveryCenterEntity>);
}

getServiceDetails method:

public async getServiceDetails(id: string): Promise<IDiscoveryCenterServiceEntity> {
    const serviceDetails = (await this.cdsService.get(`/${this.entityNameDetails}?serviceId='${id}'`) as unknown as { GetServicesDetails: string });
    return JSON.parse(serviceDetails.GetServicesDetails) as IDiscoveryCenterServiceEntity;
}

getAllServiceDetails method:

public async getAllServiceDetails(services: Array<IDiscoveryCenterEntity>) {
    const chunkSize = 20;
    let serviceDetailsResult: IDiscoveryCenterServiceEntity[] = [];
    for (let i = 0; i < services.length; i += chunkSize) {
        if (i > 0) await new Promise(resolve => setTimeout(resolve, 1000));
        const chunkServices = services.slice(i, i + chunkSize);
        let serviceDetailsPromises: Promise<IDiscoveryCenterServiceEntity>[] = [];
        for (const service of chunkServices) {
            serviceDetailsPromises.push(this.getServiceDetails(service.Id));
        }
        const responses = await Promise.all(serviceDetailsPromises);
        serviceDetailsResult = [...serviceDetailsResult, ...responses];
    }
    return serviceDetailsResult;
}

ServicesHandler.ts

Attributes and constructor:

private discoveryCenterService!: DiscoveryCenterService;
private cachedDiscoveryCenters: IDiscoveryCenterList;

constructor() {
    super([
        { event: 'on', type: 'READ' }
    ]);
    this.cachedDiscoveryCenters = [];
}

getBTPServices method:

private async getBTPServices(): Promise<IDiscoveryCenterList> {
    this.discoveryCenterService = await this.getService(DiscoveryCenterService);
    let discoveryCenterResult: IDiscoveryCenterList = [];
    let discoveryCenter = await this.discoveryCenterService.getServices();
    const serviceDetailsResult = await this.discoveryCenterService.getAllServiceDetails(discoveryCenter);

    for (const service of discoveryCenter) {
        const serviceDetail = serviceDetailsResult.find(serviceDetail => serviceDetail.Id === service.Id);
        if (serviceDetail) {
            for (const servicePlan of serviceDetail.servicePlans) {
                for (const env of servicePlan.environments) {
                    discoveryCenterResult.push({ ...service, ServicePlan: servicePlan.Code, ServicePlanName: servicePlan.Name, Infrastructure: env.Infrastructure, Platform: env.Platform, Region: env.Region });
                }
            }
        }
    }
    this.cachedDiscoveryCenters = discoveryCenterResult;
    return discoveryCenterResult;
}

onRead method:

protected async onRead(req: any) {
    let discoveryCenterResult: IDiscoveryCenterList = [];
    if (this.cachedDiscoveryCenters.length > 0) {
        console.log("return from cache")
        discoveryCenterResult = structuredClone(this.cachedDiscoveryCenters);
    }

    const skip = req?.query?.SELECT?.limit?.offset?.val;
    const rows = req?.query?.SELECT?.limit?.rows?.val;

    if (discoveryCenterResult.length < 1) {
        cds.spawn({ every: 3600000 }, async (tx) => {
            console.log("fetched again after 1h")
            discoveryCenterResult = await this.getBTPServices();
        })
        if (this.cachedDiscoveryCenters.length === 0) {
            discoveryCenterResult = await this.getBTPServices();
        }
    }

    const total = discoveryCenterResult.length;
    discoveryCenterResult.splice(skip, rows);
    if (req.query.SELECT.count) discoveryCenterResult['$count'] = total;
    return discoveryCenterResult;
}