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command

We have a client/invoker and a receiver With command pattern we want to encapsulate the request.

⇒ so our command object is a group of actions

Inderstanding the process​

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Diagram​

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Example of implementation​

Command Interface​

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Concrete Command​

light= receiver

on() = action

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The invoker​

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Test​

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Check page 220 : implementation with execute() and Undo()