To visualize the result of the refactoring of the database server class, I listed the code of the single class before the refactoring and the code of the 4 resulting classes after the refactoring.
Besides reducing the general number of lines, the resulting code looks much lighter as there are no more large blocks of code clumped together in a single method but rather small methods which either call other methods to delegate the work to do or containing only a few lines of computing code.
Figure A.1: Comparison of the Code before and after the refactoring