Java Challenge

Java challenge provided by Gamesys

Tech stack

• Java 8
• Spring Boot
• Spring Shell
• JSR 354
• Apache Commons
• Lombok
• Maven

Assumptions

• The solution should have an extensible design. Therefore, It was built on top of spring-boot framework. With this framework, any need for database or web service can be easily incorporated into de current architecture with very little or none refactoring.

• I used Martin Fowler's Clean Architecture concept to ensure that any changes in the way to provide the prices or store the books doesn't impact in the business implementation.

• Since providing a list of books as entry parameter can be error prone ( such as mispelling, multiple spaces, and read difficult) I changed it to an list of books id. The system has a custom commands that state all books id's.

How to build and run

This project already includes a minimized version of maven. All other dependencies will be downloaded by it.

Execute maven build (It may take a while in the first run):

$ ./mvnw clean install

After the message of BUILD SUCCESS, the application is ready to run:

$ ./mvnw spring-boot:run

The execution of the command above should lead to a interactive terminal.

This terminal have two custom commands, plus others already provided by spring shell.

The commands can be described executing the command:

shell:>help

The help command can be also used to describe a single command with more detail:

shell:>help price

Custom Commands

List - Created to list all books stored, showing it's Id, Title, Year and Price:

shell:>list

Price - Created to give the total value given a list of books id.

shell:> price 2,5,11

In the example above, It was requested the price of the books 'The Terrible Privacy of Maxwell Sim', 'Three Men in a Boat' and 'Great Expectations', all already stored.