My first option was setup de package project with Onin Architecture, splitting basic the packages in API, Domain and Infractruture. It is one architecture that my Squad team decided to use, one of the guys had been worked to GoEuro in Berlin and they use that way there.
Bellow all the references:
- Reference 1: https://dzone.com/articles/onion-architecture-is-interesting
- Reference 2: http://jeffreypalermo.com/blog/the-onion-architecture-part-1/
- Reference 3: http://jeffreypalermo.com/blog/the-onion-architecture-part-2/
- Reference 4: http://jeffreypalermo.com/blog/the-onion-architecture-part-3/
- Reference 5: http://jeffreypalermo.com/blog/the-onion-architecture-part-4/
- Reference 6: http://tidyjava.com/onion-architecture-interesting/
To run the content, first at all you should
mvn clean install
After run this command that should take more than one minute (60 seconds) because of Unit Tests. Please run the command bellow.
mvn spring-boot:run
If you wanna consume the api, there are two services available. The first one, is responsible to add transaction information (ammount and timestamp) about the transaction. As you can see bellow, using the method post from Http request.
http://localhost:8080/transactions
The content in the body must be:
{
"amount": 12.3,
"timestamp": 1478192204000
}
Since the timestamp is not older than 60 seconds you are gonna take 201 (Created) Http Response, otherwhise you gonna take 204 (No Content) Http Response.
In the other hand, we have the statistics service, responsible for collecting statistics from the transaction in the last 60 seconds. Using the method get from Http Request
http://localhost:8080/statistics
The response if there are transactions there, should be something like this.
{
"sum": 1000,
"avg": 100,
"max": 200,
"min": 50,
"count": 10
}
PS: Initially i've been created a code to return statistics directly with DoubleSummaryStatistics. But running my code I could realize that the attribute name average is different from specification that is avg. Thinking about that N26 has a automatically tool to run and validate my code, I decided to create Statistics.java class with right attributes.
If there is no content, the EntityNotFoundException will be launched.