The way descriptors work is not all that complicated, but the problem with them is that there are a lot of caveats to take into consideration, so the implementation details are of the utmost importance here.
In order to implement descriptors, we need at least two classes. For the purposes of this generic example, we are going to call the client class to the one that is going to take advantage of the functionality we want to implement in the descriptor (this class is generally just a domain model one, a regular abstraction we create for our solution), and we are going to call the descriptor class to the one that implements the logic of the descriptor.
A descriptor is, therefore, just an object that is an instance ...
