Lab 02

Creating an interface

In projects lab 01 , lab 02, lab 03

Analyze the DbConnector class and extract the ScoreStorageInterface from it, which will have methods to initialize, store, and retrieve Score from any source. The DBConnector class will implement this new interface.

Interface project

Move the new ScoreStorageInterface interface together with the Score class into a separate maven project. The project must export the package with interface and Score class in module-info. You must also run mvn install to install the project into your local .m2/repository.

In the original game project, you must add the new project with the interface to the dependencies in pom.xml and list it as requires in module-info.

DBConnector project

Create another new maven project and move the DBConnector class into it. You need to add a dependency to the project with the interface and to the db driver for h2 in pom.xml. The project must export a package with the DBConnector class in module-info. In module-info, also use the provides directive to provide a class that implements the ScoreStorageInterface interface.

The original game project will declare the use of the ScoreStorageInterface interface in module-info. There no longer needs to be a dependency ha H2 db driver in pom.xml, but there must be a dependency on the new project with the DBConnector class. Modify the ScoreStorageFactory class so that it does not directly create an instance of the DBConnector class, but uses the ServiceLoader class to get an instance of the class that implements the ScoreStorageInterface interface.

Zoom

FileStore project

Create another project, similar to the project with the DBConnctor class, but this time the scores will be stored in a file and not in a database.

Solution

Solution can be found at  https://gitlab.vsb.cz/jez04-vyuka/java2/labs/java2lab02v1/-/tree/solution?ref_type=heads in branche solution