Why Do We Need Facade Pattern?

Facade is a structural design pattern that provides a simplified interface to a complex subsystem. It is useful when a group of clients needs to access the functionality of several classes in a subsystem.

This would normally involve direct reference to these classes with different interfaces (tight coupling) making it difficult to implement, test, and reuse the code.

It hides complexity

The facade design pattern hides a set of complex classes behind a simple interface www.csscladding.co.uk. This makes it easier for clients to use the system without knowing how many complicated dependencies or internal structures exist. This is especially useful when working with large libraries or frameworks.

For example, if you have a framework that uses a wide range of 3rd-party services to support event sourcing or caching, each service might have its own specific initialization requirements. In addition, each may have its own interface and class hierarchy. If you want to add or change a feature, it could involve creating and calling methods in multiple classes. This would make it difficult for the client to update their code, and it would require the client to know the full complexity of the subsystem.

The Facade design pattern provides a unified interface to a set of interfaces in a subsystem. It also allows for decoupling and encapsulation. This is particularly useful when a subsystem is too complex or hard to understand, and it is necessary to break down the system into layers.

It is a communication layer

The facade pattern is an excellent way to create a communication layer for complex libraries or frameworks. Without it, your code would have to initialize and manage every object in the library or framework, keep track of their dependencies, and make sure methods are called in the right order. This can become a maintenance nightmare and limit the flexibility of your code.

Facade pattern allows you to create a simple interface for these subsystems by wrapping them in a class. Then, your client code can use this interface to interact with the system. This reduces the learning curve and makes it easier for clients to leverage the subsystem.

However, you must be careful not to over-simplify the system and restrict its flexibility. For example, some libraries are so essential to your project that they should not be wrapped in a facade. This is because they may require a different implementation under the hood. For instance, some libraries may require calls to fetch data or date formatting.

It is a wrapper

The Facade pattern is a gateway for a complex system. It is used when a client needs to access subsystem methods, but the interfaces are too complicated to work with. It also minimizes dependencies between the subsystem and its clients. This allows you to easily upgrade the subsystem without affecting the clients.

The facade class can implement a common interface for all subsystem methods and then redirect calls from the clients to those methods. It can also perform additional functionality before or after forwarding a client request. This is particularly useful when dealing with large systems that require a lot of maintenance and can be difficult to upgrade or maintain.

The Facade pattern is a structural design pattern and can be contrasted with the Adapter pattern, which is a behavioural design pattern. The Adapter pattern makes two existing interfaces work together, whereas the Facade pattern defines an entirely new interface. In addition, the Facade pattern is a Singleton, while the Adapter pattern is not.

It is a gateway

The facade pattern allows clients to access the functionality of a complex subsystem without directly referencing its classes. This reduces complexity and improves maintainability. It also decouples the subsystem from its client code and makes it easier to change its implementation.

In a simple example, a restaurant customer would not want to know who cuts the meat or how long it takes to cook the food. Instead, the customer would like to eat a meal that meets their expectations. The menu is the facade that enables them to achieve this goal by reducing the complexity of the restaurant’s internal processes.

The facade pattern is similar to the Adapter pattern, but it is more granular. While the Adapter pattern tries to make an existing interface usable, the Facade pattern works on entire subsystems of objects. Facades may be used to avoid the creation of god objects, which are tightly coupled to all other classes in an application.