Strategy Pattern

Metadata

Lecture equivalent	Duration
3	2h 15min

At the end of this task, students

• have studied other design patterns
• have analysed and described how the strategy pattern works
• have analysed and described how unit tests isolate the implemented strategy

Finish the bite

Task

Finish the tasks from the lecture:

• Watch 5 Design Patterns Every Engineer Should Know
• Analyse at least three more design patterns over at refactoring.guru/design-patterns/catalog
• Hand the patterns in to the form

Refresh git

In the lecture we have seen, that some are shaky on the git-legs.

Optional task

Complete our classroom exercise Git & GitHub Fundamentals. It is a basic onboarding course to git. You do not need to hand in any result here, the classroom of GitHub handles that for you 👍🏼

Digest

We mentioned it already some times, a key soft skill of an engineer is to understand code from others. The engineer before you (me 😈) was an 🕳, he did not leave any comments in code. But he is convinced that he did a great job at implementing the strategy pattern! He even wrote tests 🚀

Task

You will be given a list of classes. Open up these classes and document inline what the author did implement!

How to

Lets take a look at this line.

Logger logger = LoggerFactory.getLogger(SortingFactory.class);

Annotate it for example like so:

Logger logger = LoggerFactory.getLogger(SortingFactory.class); // Request a new logger that will log with the prefix 'SortingFactory: <log message>'

You can also use block comments:

/** 
* Request a new logger that will log with the prefix 'SortingFactory: <log message>'
*/
Logger logger = LoggerFactory.getLogger(SortingFactory.class);

Do that for every line you consider worth commenting. You might need to google what some lines do, but that is also a key skill.

Start

You know how git works. I do not tell you how.

Result

Hand in a commit sha to the assignment where I can see your comments!

Work

Checkout this release.

Comment the following classes:

└── src
    ├── main
    │   └── java
    │       └── ch
    │           └── abbts
    │               └── nds
    │                   └── swe
    │                       └── swdt
    │                           └── starter
    │                               └── skill
    │                                   ├── AscendingStringOrderImpl.java
    │                                   ├── SkillsController.java
    │                                   ├── SkillsRepository.java
    │                                   ├── SkillsService.java
    │                                   └── SortingFactory.java
    └── test
        └── java
            └── ch
                └── abbts
                    └── nds
                        └── swe
                            └── swdt
                                └── starter
                                    └── skill
                                        ├── SkillControllerTestIT.java
                                        └── SkillServiceTest.java

In total you must comment 7 classes.

Reminder

In order to check this into your repository you need to delete my .git folder, then use git init to create a new working copy (remember the whiteboard drawing from the lecture).