How do you handle dependencies and inheritance among your interfaces?

Básicamente el principio de segregación de interfaces propone que solo deberías realizar implementaciones de aquellas funciones que utiliza tu clase. Un ejemplo muy sencillo para entender este concepto: Tenemos una interfaz trabajador con 2 funciones requeridas que son comer y trabajar Si aplicamos esta interfaz a una persona encaja perfectamente porque realiza ambas tareas, pero ?Qué pasa si implementamos esta interfaz en un robot? Sólo sería aplicable trabajar, por lo que deberíamos separar esa interfaz en 2 interfaces una de trabajar y otra de comer. De esta forma cada clase (persona o robot) implementaría aquellas que necesita y no una común con funciones que no necesita

This principle suggests that a client should not be forced to depend on interfaces it doesn't use. In other words, interfaces should be tailored to specific client needs rather than being overly broad. By breaking down interfaces into smaller, cohesive units, you can minimize the impact of changes and make systems more maintainable and adaptable.

Interface Segregation Principle (ISP) State as : - As the name define **Interface Segregation** where you divide one big-fat interface into multiple smaller interfaces **based on its functionality and suitability**. - This **Segregation** of interface prevents class from being forced to implement all method of interface which is not required by class. - Each interface should represent a single functionality or responsibility. - It’s about clients not being affected by changes that they don’t use.

ISP recommends that no client be forced to rely on methods that it does not use. Instead of a single large interface, multiple specific interfaces are preferred based on client requirements. This ensures that a system is modular, making it easier to understand, refactor, and replace components. Consider a multimedia player interface. Rather than having a single interface with methods for playing music, videos, and podcasts, create separate interfaces such as IMusicPlayer, IVideoPlayer, and IPodcastPlayer. This allows clients to rely solely on the interfaces that are relevant to their needs, reducing coupling and making the system more maintainable and flexible.

For inheritance, it's important to ensure that child interfaces or classes are a logical extension of their parent. This maintains cohesion as each interface or class has a clear, single purpose. Consider a banking application with interfaces IAccount and IDepositAccount. IDepositAccount inherits from IAccount and has additional methods related to deposit operations. This is a logical extension, maintaining high cohesion

Cohesion measures the relationship among a class or interface's members. High cohesion, seen in a focused purpose and aligned methods, boosts code readability, reusability, and testability. Conversely, low cohesion, with disparate responsibilities, hampers code maintainability and comprehension. Emphasizing high cohesion contributes to cleaner, more maintainable software design.

Single Responsibility: High cohesion means each interface should represent a single concept or responsibility, ensuring that the interface serves one specific area of the application. Related Functions: In a cohesive interface, all methods are closely related in their function, working together to fulfill a common goal. Ease of Understanding: High cohesion leads to interfaces that are easier to understand because their purpose is clear and focused, without any extraneous or unrelated methods. Independent Evolution: When interfaces are highly cohesive, changes to one part of the system are less likely to affect others, allowing for independent evolution and maintenance.

High cohesion within a class or interface not only simplifies understanding and maintenance but also enhances modularity, making the system more flexible to changes. By adhering to the Single Responsibility Principle, developers can ensure that each class or interface has a clear, singular focus, which in turn reduces the complexity of the system. This approach facilitates easier debugging and testing, as each component has a well-defined role, minimizing the impact of changes and improving the overall software quality.

To achieve high cohesion, group related methods and properties within a class, ensuring that each class or module has a clear and focused purpose. Avoid combining unrelated functionalities in a single class or module.

When applying ISP and cohesion together, strive to create interfaces that represent specific, cohesive functionalities. This ensures that classes implementing these interfaces will naturally exhibit high cohesion, as they are bound by the common purpose defined in the interface.

Apply ISP and cohesion concurrently by designing interfaces with a singular purpose, exposing only relevant methods. Avoid inheriting from large, generic interfaces to prevent unnecessary dependencies and uphold ISP. Prioritize composition over inheritance, utilizing smaller, specific interfaces to define class behaviors. This approach enhances modularity, readability, and maintainability in your software design.

Implementing ISP and cohesion yields modular, flexible code, facilitating seamless swapping of implementations. Enhanced testability and maintainability result from isolating and mocking class dependencies. The improved readability allows for clearer expression of class intent and functionality. Overall, these principles contribute to a more adaptable and comprehensible software design.

The benefits of ISP include improved maintainability, flexibility, and reduced coupling. High cohesion contributes to better code organization, readability, and maintainability, making it easier for developers to comprehend and modify the code.

An example of ISP could be a logging interface that includes methods for both file-based and database-based logging. By segregating this interface into two (FileLogger and DatabaseLogger), we adhere to ISP. For cohesion, consider a class responsible for user authentication. Methods like ValidateCredentials and GenerateToken can be kept together for high cohesion.