Avoid god classes
- Do not create god classes/objects in your system. Be very suspicious of an abstraction whose name contains Driver, Manager, System, or Subsystem. --Riel's Heuristic 3.2, Arthur Riel 1996
A god class is a class that either knows too much or does too much; a class that has to deal with too many responsibilities. The instantiated object of a god class is called a god object.
Instead of having objects collaborate and distribute data among themselves, they rely to the god object as a "centralised data center". As a consequence of this, maintenance can become difficult. The god class usually has too many number of irrelevant functions or too many global variables.
However, there is an instance in which a god class is particularly useful, where performance is needed over maintainability (eg. micro-controllers or hardware programming).
God class/god object is a known software design antipattern.