Friday, January 11, 2008

Command-Query Separation Principle

The principle states that every method should either be:
  • a command method that performs an action (updating, coordinting, ...) and is void (no return value); or
  • a query that returns data to the caller and has no side effects - it should not permanently change the state of any objects

But - and this is the key point - a method should not be both

Applying UML and Patterns by Craig Larman

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