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Playing with CQRS and Event Sourcing

On Jan 14th the group Softwerkskammer Munich organized another awesome meetup, and the topic was CRQS (Command Query Responsability Segregation) and Event Sourcing, which were unknown to me.

After a brief explanation by Bradford Hovinen, we started our Kata, described here, but I confess I spent most of time setting up (unsuccessfuly) Eclipse to open the Graddle project, I decided to implement it as a "homework", but in C++ instead of Java, as I am not really a fan of Java and my C++ skills has became a bit rusty lately, so it was also a great opportunity to practise it again.

I didn't fucused on all aspects of the original description, so a lot of things are missing.

What does this code do so far?

  • Add items to the "singleton" (there is only one list per service) shopping list
  • Removes items
  • Infinite undo's (Yay!)
  • Unit tests for all operations

TODO

  • Notification system
  • Action Validation
  • Separation between Read and Write repository
  • "Strike" operation

Running it

Unfortunately there is no "main" executable yet. So far there is only unit test code. After cloning the repository, compile and run the tests with:

$ mkdir build
$ cd build
$ cmake ..
$ make && make tests

For a "pretty" tests output, run:

./tests/shopping_tests --reporter=spec