Scala Design Patterns - Second Edition

The command design pattern

This design pattern represents an object that is used to store information about an action that needs to be triggered at a later time. The information includes the following:

• The method name
• The owner of the method
• Parameter values

The client then decides which commands need to be executed and when by the invoker. This design pattern can easily be implemented in Scala using the by-name parameters feature of the language.