Facade in C++ Design Patterns

Table Of Content

• Here is a breakdown of the components:
• Use Cases of Facade Method Design Pattern in Java
• Structural code to show the implementation of Facade design pattern in C#
• What is the Facade Method Design Pattern?

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Here is a breakdown of the components:

For instance, Spring Framework utilizes the Facade pattern to abstract away complex configurations and provide a simplified way of using its features. The JdbcTemplate class is a perfect example of a Facade that hides the complexity of dealing with low-level database operations. As an intermediary, the facade object ensures that access and communication with the individual components of a subsystem are simplified and direct dependence on these components is minimized. It delegates the client calls so clients don’t need to know the classes or their relationships and dependencies.

Use Cases of Facade Method Design Pattern in Java

This structural code demonstrates the Facade pattern which provides a simplified and uniform interface to a large subsystem of classes. "The Facade Pattern provides a unified interface to a set ofinterfaces in a subsytem. Facade defines a higher level interface thatmakes the subsystem easier to use." The Facade pattern simplifies and hides the complexity of large code blocks or APIs, providing a cleaner, understandable and easy of use interface.

Structural code to show the implementation of Facade design pattern in C#

A design pattern is a general reusable solution to a commonly occurring problem within a given context in software design. Thus, it provides a simplified and unified interface on top of a complex sub-system. Design patterns are useful as they solve recurring problems and in general simplify code.

In Java programming, we must have connected to a database to fetch some data. It is another example of Facade pattern in the programming world. Ensure that the coupling between the Facade and the subsystems is loose. Changes in the subsystem should not affect the Facade, and vice versa.

It also promotes decoupling the subsystem from its potentially many clients. On the other hand, if the Facade is the only access point for the subsystem, it will limit the features and flexibility that "power users" may need. The Facade design pattern is a pattern that provides a simplified interface to a complex system. You can use the Facade design pattern when a system is too complex or difficult to understand. A Facade Pattern says that just "just provide a unified and simplified interface to a set of interfaces in a subsystem, therefore it hides the complexities of the subsystem from the client". A facade does not encapsulate the subsystem classes or interfaces.

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The following UML diagram illustrates the interaction of clients, facade, and sub-system classes according to the facade pattern. In summary, the Facade Design Pattern is valuable when dealing with complex systems, aiming for a simplified interface, promoting loose coupling, and providing abstraction and encapsulation. It is a good choice when we want to enhance the usability and maintainability of our software.

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Suppose we have an application with set of interfaces to use MySql/Oracle database and to generate different types of reports, such as HTML report, PDF report etc. So we will have different set of interfaces to work with different types of database. Now a client application can use these interfaces to get the required database connection and generate reports. But when the complexity increases or the interface behavior names are confusing, client application will find it difficult to manage it.

Then the operator, on behalf of a restaurant, gives the voice interface, which is a facade for you. So now, you can order a Burger, and you need not worry about the complexity of preparing a Burger, like what all operations they perform or the temperature they will cook. Let's understand the example of facade design pattern by the above UML diagram.

These members access the subsystem on behalf of the facade user, hiding the implementation details. The Facade pattern is classified under the structural design patterns category because it simplifies the way we interact with complex systems. It doesn’t change the system itself but encapsulates it behind a Facade, thus making it easier to use. This is achieved by designing a higher-level interface that encapsulates and hides the system’s complexities.

The web site may require only limited access to this business logic. For example, the web site may need to show whether an item for sale has reached a limited level of stock. The IsLowStock method of the facade class could return a Boolean value to indicate this.