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Creating dashboard apps with Semantic Data Interconnect (SDI)

The samples included with this document helps you to use the SDI APIs to quickly create an application that can generate cross-domain schemas, query the data and create a simple dashboard to consume the query data.

Prerequisites

The following prerequisites must be fulfilled to use these samples:

  • You have a REST client to access APIs. For e.g. Postman.
  • Before using the samples, you need to obtain an OAuth bearer access token from MindSphere. Please refer to the self-hosted application MindSphere guideline or contact MindSphere for further details.
  • Register as user in SIOS to access Package for each example.
  • Create the test data using SDI provided REST endpoints using Postman or similar REST client program. All these endpoints are also provided as Postman collection in SIOS. You can modify this as required.
  • Import both the Postman collection from SIOS and the PROD.postman_environment.json file and select PROD as environment.
  • Each example source code has set of instructions that need to be followed. Use “README.md” in the client code to update configuration and environment files for values that need to be updated before the client can work properly. Once the clients and support files are updated with appropriate values, they can be compiled.

Sample applications

Prerequisites to deploy the sample applications

  • Access to MindSphere Launchpad
  • NPM manager installed with NodeJS
  • Download and install Java with JDK and Maven (for crash analytics app only)
  • In order to deploy app on MindSphere Launchpad using Cloud Foundry, the Cloud Foundry set up must already be there on your local system. Please refer to Running Cloud Foundry hosted application or contact MindSphere team in case Cloud Foundry setup is not ready or not working.

The Package-SIOS

The following artifacts are available in SIOS which can be used after logging into SIOS:

  • Source codes of the sample applications (air quality and crash analytics)
  • Sample data
  • Postman collection to use SDI APIs for SDI admin steps (along with sample request and response)

Example 1: Air Quality App

This is a step-by-step guide to leverage SDI services to create a simple air quality index dashboard that shows comparison of air quality across North America. The sample data used in this application is collected from epa.gov and uploaded in SIOS along with Reference app sample code.

To deploy this app, make sure that the prerequisites are fulfilled.

Procedure

  1. Register Data Sources: Create two data registries for monitoring site location and hourly air quality data for your sample application. For more information, refer SDI Data Management APIs.
    a. Use the following endpoint to create the hourly air quality data registry so that the hourly air quality data can be uploaded.
  POST /dataRegistries

Provide the following values as JSON request while using above endpoint:

  {
    "dataTag": "aqi",
    "filePattern": "hourlydata_[0-9]+.csv",
    "fileUploadStrategy": "replace",
    "sourceName": "airnow"
  }
b. Use the following endpoint to create the monitoring site location data registry.
  POST /dataRegistries
Provide the following values as JSON request while using above endpoint:

  {
    "dataTag": "monitoringsites",
    "filePattern": "monitoring_site_locations.csv",
    "fileUploadStrategy": "replace",
    "sourceName": "airnow"
  }
2. Upload Files: Upload the sample data files as provided in sample folder for the created data registry. The /dataUpload endpoint returns filePath. Use this filePath to start data ingest.
3. Data Ingestion: Start data ingest with retrieved filePath. The /ingestJobs endpoint returns jobId that can be used to query or understand the current status of the uploaded file. SDI creates a schema after the job is completed.
This sample application uses CSV files only. If you want to create another application with XML file, then provide a proper defaultRootTag while creating a data registry. For more information on how to work with xml format refer SDI Data Management APIs.
a. Upload monitoring site sample data file using the following endpoint:
  POST /dataUpload
b. Start data ingest providing the below request json to POST /ingestJobs endpoint:
  {
    "dataTag": "monitoringsites",
    "filePath": "monitoring_site_locations.csv",
    "sourceName": "airnow"
  }
c. Repeat the above step and upload hourly sample data file using same URL as above. This endpoint takes the below request json: json { "dataTag": "aqi", "filePath": "hourlydata_001.csv", "sourceName": "airnow" }

For each ingested file, SDI generates the schema that user can query upon. Use the query service endpoints to create query once files are uploaded successfully and schema is generated. User can verify the status of schema using /ingestJobStatus/{jobId}. This endpoint takes the jobid as request, this jobid is same as returned by above endpoints. Verify that job message in response JSON is “Finished”.

Note

The steps 2 and 3 are applicable if you have your own data lake. If you have data in MindSphere Integrated Data Lake (IDL), you need to follow steps as in SDI Data Management APIs for data ingest. For more information, refer Uploading data to Integrated Data Lake.

4.Query creation: Create a query to be used in Data Query Service. You can choose to create query based on physical schema or create a Semantic model and create business query based on this Semantic model. You can extract out the physical schema by using the following endpoint:

  POST /searchSchemas

The json request for this endpoint is as below:

  {
    "schemas": [
    {
        "dataTag": "aqi",
        "sourceName": "airnow"
      },
      {
        "dataTag": "monitoringsites",
        "sourceName": "airnow"
      }
    ]
  }

Once collections are created by SDI, you can either generate the Semantic model or create query using extracted physical schema.

Create a physical query

You can create a query by using POST /queries endpoint. For more information on query formats, refer Creating Query using SDI. For example, this sample application selects site, particle pollution parameter, air quality index value, longitude and latitude from two schemas generated above. This data is selected based on common aqsid where particle pollution parameter is PM2.5.

Query Request JSON

This query request will return the queryid. Store the queryid response and use this queryid as an input to sample application. Optionally, you can verify this queryid result by calling GET /queries/{id}/executionJobs/latestResults endpoint. Below is the partial sample response obtained by executing the above generated queryid.

Prepare a query based on the schema created by SDI :

SELECT
  airnow04_aqi04.sitename,
  airnow04_aqi04.parametername,
  airnow04_aqi04.value,
  airnow04_monitoringsites04.latitude,
  airnow04_monitoringsites04.longitude
FROM
  airnow04_aqi04
  inner join airnow04_monitoringsites04 on airnow04_aqi04.aqsid = airnow04_monitoringsites04.aqsid
WHERE
  airnow04_aqi04.parametername = 'PM2.5'
  and airnow04_aqi04.parametername = airnow04_monitoringsites04.parametername

To add this query to create request, encode it using base64 encoder.

  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

Create query request JSON:

{
  "name": "AQI",
  "description": "Query on the physical schema for air data quality",
  "isBusinessQuery": false,
  "isDynamic": false,
  "sqlStatement": "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"
}

Query Response JSON

Response
            {
            "status": "CURRENT",
            "timestamp": "2020-04-21T16:58:16.633Z",
            "data": [
              {
                "airnow04_aqi04.sitename": "Mount Pearl",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 3,
                "airnow04_monitoringsites04.latitude": 47.505,
                "airnow04_monitoringsites04.longitude": -52.7947
              },
              {
                "airnow04_aqi04.sitename": "Mount Pearl",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 29,
                "airnow04_monitoringsites04.latitude": 47.505,
                "airnow04_monitoringsites04.longitude": -52.7947
              },
              {
                "airnow04_aqi04.sitename": "MacPherson Avenue - ",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 1,
                "airnow04_monitoringsites04.latitude": 48.95224,
                "airnow04_monitoringsites04.longitude": -57.92207
              },
              {
                "airnow04_aqi04.sitename": "MacPherson Avenue - ",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 1,
                "airnow04_monitoringsites04.latitude": 48.95224,
                "airnow04_monitoringsites04.longitude": -57.92207
              },
              {
                "airnow04_aqi04.sitename": "Marystown/Burin",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": -1,
                "airnow04_monitoringsites04.latitude": 47.098991,
                "airnow04_monitoringsites04.longitude": -55.198521
              },
              {
                "airnow04_aqi04.sitename": "Marystown/Burin",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 0,
                "airnow04_monitoringsites04.latitude": 47.098991,
                "airnow04_monitoringsites04.longitude": -55.198521
              },
              {
                "airnow04_aqi04.sitename": "CHARLOTTETOWN",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 2,
                "airnow04_monitoringsites04.latitude": 46.2406,
                "airnow04_monitoringsites04.longitude": -63.1306
              },
              {
                "airnow04_aqi04.sitename": "CHARLOTTETOWN",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 17,
                "airnow04_monitoringsites04.latitude": 46.2406,
                "airnow04_monitoringsites04.longitude": -63.1306
              },
              {
                "airnow04_aqi04.sitename": "WELLINGTON",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 1,
                "airnow04_monitoringsites04.latitude": 46.4783,
                "airnow04_monitoringsites04.longitude": -63.9869
              },
              {
                "airnow04_aqi04.sitename": "WELLINGTON",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 11,
                "airnow04_monitoringsites04.latitude": 46.4783,
                "airnow04_monitoringsites04.longitude": -63.9869
              },
              {
                "airnow04_aqi04.sitename": "SOUTHAMPTON",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": -3,
                "airnow04_monitoringsites04.latitude": 46.3864,
                "airnow04_monitoringsites04.longitude": -62.5828
              },
              {
                "airnow04_aqi04.sitename": "SOUTHAMPTON",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 11,
                "airnow04_monitoringsites04.latitude": 46.3864,
                "airnow04_monitoringsites04.longitude": -62.5828
              },
              {
                "airnow04_aqi04.sitename": "JOHNSTON BUILDING -",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 12,
                "airnow04_monitoringsites04.latitude": 44.647,
                "airnow04_monitoringsites04.longitude": -63.574
              },
              {
                "airnow04_aqi04.sitename": "JOHNSTON BUILDING -",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 12,
                "airnow04_monitoringsites04.latitude": 44.647,
                "airnow04_monitoringsites04.longitude": -63.574
              },
              {
                "airnow04_aqi04.sitename": "Lake Major",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 6,
                "airnow04_monitoringsites04.latitude": 44.7197,
                "airnow04_monitoringsites04.longitude": -63.4819
              },
              {
                "airnow04_aqi04.sitename": "Lake Major",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 27,
                "airnow04_monitoringsites04.latitude": 44.7197,
                "airnow04_monitoringsites04.longitude": -63.4819
              },
              {
                "airnow04_aqi04.sitename": "PORT HAWKESBURY",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 1,
                "airnow04_monitoringsites04.latitude": 45.61394,
                "airnow04_monitoringsites04.longitude": -61.36235
              },
              {
                "airnow04_aqi04.sitename": "PORT HAWKESBURY",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 15,
                "airnow04_monitoringsites04.latitude": 45.61394,
                "airnow04_monitoringsites04.longitude": -61.36235
              },
              {
                "airnow04_aqi04.sitename": "SYDNEY",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 3,
                "airnow04_monitoringsites04.latitude": 46.1425,
                "airnow04_monitoringsites04.longitude": -60.1728
              },
              {
                "airnow04_aqi04.sitename": "SYDNEY",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 18,
                "airnow04_monitoringsites04.latitude": 46.1425,
                "airnow04_monitoringsites04.longitude": -60.1728
              },
              {
                "airnow04_aqi04.sitename": "AYLESFORD MOUNTAIN",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 8,
                "airnow04_monitoringsites04.latitude": 45.0061,
                "airnow04_monitoringsites04.longitude": -65
              },
              {
                "airnow04_aqi04.sitename": "AYLESFORD MOUNTAIN",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 33,
                "airnow04_monitoringsites04.latitude": 45.0061,
                "airnow04_monitoringsites04.longitude": -65
              },
              {
                "airnow04_aqi04.sitename": "PICTOU",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 0,
                "airnow04_monitoringsites04.latitude": 45.6819,
                "airnow04_monitoringsites04.longitude": -62.6953
              },
              {
                "airnow04_aqi04.sitename": "PICTOU",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 10,
                "airnow04_monitoringsites04.latitude": 45.6819,
                "airnow04_monitoringsites04.longitude": -62.6953
              },
              {
                "airnow04_aqi04.sitename": "KENTVILLE",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 11,
                "airnow04_monitoringsites04.latitude": 45.04,
                "airnow04_monitoringsites04.longitude": -64.29
              },
              {
                "airnow04_aqi04.sitename": "KENTVILLE",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 35,
                "airnow04_monitoringsites04.latitude": 45.04,
                "airnow04_monitoringsites04.longitude": -64.29
              },
              {
                "airnow04_aqi04.sitename": "FOREST HILLS",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 14,
                "airnow04_monitoringsites04.latitude": 45.3092,
                "airnow04_monitoringsites04.longitude": -66.0092
              },
              {
                "airnow04_aqi04.sitename": "FOREST HILLS",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 18,
                "airnow04_monitoringsites04.latitude": 45.3092,
                "airnow04_monitoringsites04.longitude": -66.0092
              },
              {
                "airnow04_aqi04.sitename": "SAINT JOHN WEST",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 10,
                "airnow04_monitoringsites04.latitude": 45.2536,
                "airnow04_monitoringsites04.longitude": -66.0803
              },
              {
                "airnow04_aqi04.sitename": "SAINT JOHN WEST",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 25,
                "airnow04_monitoringsites04.latitude": 45.2536,
                "airnow04_monitoringsites04.longitude": -66.0803
              },
              {
                "airnow04_aqi04.sitename": "CASTLE ST. SAINT JO",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 3,
                "airnow04_monitoringsites04.latitude": 45.2803,
                "airnow04_monitoringsites04.longitude": -66.0561
              },
              {
                "airnow04_aqi04.sitename": "CASTLE ST. SAINT JO",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 3,
                "airnow04_monitoringsites04.latitude": 45.2803,
                "airnow04_monitoringsites04.longitude": -66.0561
              },
              {
                "airnow04_aqi04.sitename": "MONCTON",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 1,
                "airnow04_monitoringsites04.latitude": 46.11,
                "airnow04_monitoringsites04.longitude": -64.79
              },
              {
                "airnow04_aqi04.sitename": "MONCTON",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 8,
                "airnow04_monitoringsites04.latitude": 46.11,
                "airnow04_monitoringsites04.longitude": -64.79
              },
              {
                "airnow04_aqi04.sitename": "ST ANDREWS",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 4,
                "airnow04_monitoringsites04.latitude": 45.0892,
                "airnow04_monitoringsites04.longitude": -67.0786
              },
              {
                "airnow04_aqi04.sitename": "ST ANDREWS",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 21,
                "airnow04_monitoringsites04.latitude": 45.0892,
                "airnow04_monitoringsites04.longitude": -67.0786
              },
              {
                "airnow04_aqi04.sitename": "BATHURST",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 3,
                "airnow04_monitoringsites04.latitude": 47.6094,
                "airnow04_monitoringsites04.longitude": -65.6333
              },
              {
                "airnow04_aqi04.sitename": "BATHURST",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 14,
                "airnow04_monitoringsites04.latitude": 47.6094,
                "airnow04_monitoringsites04.longitude": -65.6333
              },
              {
                "airnow04_aqi04.sitename": "Parc Primavere",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 5,
                "airnow04_monitoringsites04.latitude": 46.77417,
                "airnow04_monitoringsites04.longitude": -71.36972
              },
              {
                "airnow04_aqi04.sitename": "Parc Primavere",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 16,
                "airnow04_monitoringsites04.latitude": 46.77417,
                "airnow04_monitoringsites04.longitude": -71.36972
              },
              {
                "airnow04_aqi04.sitename": "Z�phirin",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 2,
                "airnow04_monitoringsites04.latitude": 46.0419,
                "airnow04_monitoringsites04.longitude": -72.66
              },
              {
                "airnow04_aqi04.sitename": "Z�phirin",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 2,
                "airnow04_monitoringsites04.latitude": 46.0419,
                "airnow04_monitoringsites04.longitude": -72.66
              },
              {
                "airnow04_aqi04.sitename": "Saint-Faustin",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 1,
                "airnow04_monitoringsites04.latitude": 46.035,
                "airnow04_monitoringsites04.longitude": -74.4819
              },
              {
                "airnow04_aqi04.sitename": "Saint-Faustin",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 30,
                "airnow04_monitoringsites04.latitude": 46.035,
                "airnow04_monitoringsites04.longitude": -74.4819
              },
              {
                "airnow04_aqi04.sitename": "B�cancour (Ar�na)",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 4,
                "airnow04_monitoringsites04.latitude": 46.35,
                "airnow04_monitoringsites04.longitude": -72.4333
              },
              {
                "airnow04_aqi04.sitename": "B�cancour (Ar�na)",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 4,
                "airnow04_monitoringsites04.latitude": 46.35,
                "airnow04_monitoringsites04.longitude": -72.4333
              },
              {
                "airnow04_aqi04.sitename": "Ottawa",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 5,
                "airnow04_monitoringsites04.latitude": 45.4322,
                "airnow04_monitoringsites04.longitude": -75.6764
              },
              {
                "airnow04_aqi04.sitename": "Ottawa",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 23,
                "airnow04_monitoringsites04.latitude": 45.4322,
                "airnow04_monitoringsites04.longitude": -75.6764
              },
              {
                "airnow04_aqi04.sitename": "Windsor Downtown",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 4,
                "airnow04_monitoringsites04.latitude": 42.3144,
                "airnow04_monitoringsites04.longitude": -83.0433
              },
              {
                "airnow04_aqi04.sitename": "Windsor Downtown",
                "airnow04_aqi04.parametername": "PM2.5",
                "airnow04_aqi04.value": 24,
                "airnow04_monitoringsites04.latitude": 42.3144,
                "airnow04_monitoringsites04.longitude": -83.0433
              },
              {
                "airnow04_aqi04.sitename": "Kingston",
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