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Understanding the Command Pattern The Command design pattern encapsulates a request as an object, thereby allowing clients to parameterize with different requests, queue requests, or log requests, and support undoable operations. Its fundamental purpose is to decouple the object that invokes an operation (the invoker) from the object that actua ...

Overview The Observer Pattern, also known as the Publish-Subscribe Pattern, defines a one-to-many dependency between objects. When the state of a subject object changes, all dependent observers are automatically notified and updated. This behavioral pattern decouples the subject from its observers, enabling loose coupling through a message-broa ...