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How Can Refactoring Eliminate Friend Dependencies in Shared Resource Management?

Nov 05, 2024 pm 12:04 PM

How Can Refactoring Eliminate Friend Dependencies in Shared Resource Management?

Friend Dependency Removal and Refactoring in a Shared Resource Management Design

In object-oriented design, the "friend" dependency introduces a tight coupling between classes and raises maintenance concerns. To remove such dependencies while maintaining the functionality of a shared resource management design, a multi-step refactoring process is recommended.

Step 1: Introduce an Abstract Interface

The initial step involves replacing the "friend" dependency with an abstract interface, InternalInterface, which defines the operations previously accessible only to the friendly class.

Step 2: Move Operations to the Interface

The operations that constituted the "call" dependency are shifted from the ClassA implementation to the InternalInterface definition.

Step 3: Connect Interface and Implementation

To provide access to the InternalInterface, introduce a protected constructor and protected generalization relationship between ClassA and InternalInterface.

Step 4: Glue the Components

In the ClassAAccessor constructor, introduce a setInternalInterfaceRef() method that allows ClassAAccessor to obtain a reference to InternalInterface from ClassA.

Step 5: Use Internal Interface for Access

Implement the attachAccessor() method in ClassA to pass the internal interface reference to ClassAAccessor.

Step 6: Optimize Coupling (Optional)

For further decoupling, introduce a second interface, InternalClientInterface, to mediate between ClassAAccessor and InternalInterface.

Advantages:

  • Eliminates the "friend" dependency according to UML 2.2 standards.
  • Complies with coding guidelines that discourage "friend" usage.
  • Provides a more explicit and maintainable design.

Disadvantages:

  • May increase code complexity.
  • Requires abstract interfaces that potentially affect the footprint of the design.
  • Protected generalization relationships have limited UML representation support.

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