Java REST application for the currency conversion.
Task with "CLIENT" described functionalities/Use Cases is :
Using https://exchangeratesapi.io/ API as source of data create Exchange Rate Service that will offer following functionality:
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Will allow a South African Republic national to check how much he has to pay for INPUT amount of Norwegian Krone
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Allow an American to Calculate average price of Brazilian Real between 12/24/2017 and 12/27/2017
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Will display currency with highest stability in price quoted against Croatian Kuna for GIVEN period
Assumptions :
Current exchange rates served by exchangeratesapi.io are changed every 60 seconds
https://exchangeratesapi.io/ can serve up to 100 requests per second and your service needs to serve up to a 1000
You have up to 5 machines you can use to run necessary systems
Historical data doesn’t change
In your current setup you don’t have ability to create a persistent storage
- Code: Java 8, Spring Boot, Spring Web Framework, Gradle
- Cache: Ehcache
- Functional tests: Spock, Groovy, Spring Mock MVC
- Algorithm used to calculate the highest stability in price: Standard Deviation
- Deployed: AWS (Maybe it is still here)
- Performance tests: LOCUST and custom tests in Python
- Solution time: 3 days
- use gradle: ./gradlew bootJar (or use already prepared currencyExchangeService-0.1.1.jar)
- java -jar build/libs/currencyExchangeService-0.1.1.jar
- http://localhost:8080/convert?fromamount=2&to=PLN&from=USD
- http://localhost:8080/average?to=PHP&from=AUD&start_at=2019-02-02&end_at=2019-02-13
- http://localhost:8080/sd?start_at=2018-01-01&end_at=2018-01-20&base=PLN
- http://localhost:8080/latest?base=EUR
- use Python and pip3 to install Flask and Locustio
- run dedicated script in performance directory: ./performance/run_tests.py
Table with LOCUST performance results summary
- More tests - unit and functional tests
- Code refactoring