Minimum and Maximum statistics on a period. (Data source is COVID19-API)

• Develop and implement an API that allows you to find for a specified list of countries: Maximum/minimum number of new cases per day on the selected day/period.
• Receive data via API: https://covid19api.com/
• Restrictions: ** It is necessary to minimize the number of hits from the source site during daily use of the application.
• Technologies: Java 17+, Spring boot/Micronaut

• Spring boot 3.0.1
• Java 17
• Lombok
• GraphQL
• Jooq
• FlywayDB
• Docker-Compose
• PostgreSQL database
• Unit Tests (JUnit, Mockito, Spring-tests, Jacoco)

1. Prepare Docker and Docker compose for your environment.

   1. Docker installation process: https://docs.docker.com/engine/install/
   2. Docker Compose installation process: https://docs.docker.com/compose/install/

2. Open terminal (cmd, etc) and CD to the folder {project}/docker/pgsql/. Configure the docker-compose.yaml according your folder paths. Option volumes change with your folder "{replace-this}:/var/lib/postgresql/data"

3. Run a command docker-compose up. Must work and will be there a new listener on port 55433.

4. Download Java17+ and prepare it for running apps (add executable files folder into PATH env variable) i.e. https://docs.aws.amazon.com/corretto/latest/corretto-17-ug/downloads-list.html

5. Check you have JDK 17+ running command in terminal java --version

6. Build the project: .\gradlew clean buildJar.

7. If BUILD SUCCESSFUL on last step, run the Application one of these ways:

   • .\gradlew bootRun or

   • In root of the project run:
     #> java -jar build\libs\covid19-api-stats-0.0.1-SNAPSHOT.jar
     

   • If you`d like to run the App in background use this way: 
     #> javaw -jar build\libs\covid19-api-stats-0.0.1-SNAPSHOT.jar
     

8. Open in your web browser (FF, IE, Opera, Safari, etc) http://localhost:8989/gql. Example of GraphQL query is below.

Run APP with default settings. Open http://localhost:8989/gql

Example GraphQL query: Getting MinMax statistics for Poland and China in period 2022-03-18 ~ 2022-03-19.

query {
    statisticsByCountryAndPeriod(
    countries: ["china","poland"],
    dateFrom:"2022-03-18T00:00:00",
    dateTo: "2022-03-19T00:00:00"
) {
    key
        value{
            maximumCases
            maximumCasesDates
            minimumCases
            minimumCasesDates
        }
    }
}

• PostgreSQL
• JDBC url and details in a properties file. fo