Smaller Web Hexagon
Illustration of a simple hexagon with one user (left) port and one database (right) port.
It simply calculates the formula:
result = input * rate
result = 100 * 1.1 = 110
The user port is connected to either the web or to a test harness, with or without the server adapter.
The database port looks up the rate in a database, either in-the-code database, or from a file.
The startup decides how the wiring goes.
Running the Application
rackup config.ru to get the web UI on port 9292