Client: Requests the facade to perform some action.
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Subsystem classes are used by the facade, but not the other way around.
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Users can download the client app and place an order from their devices. Our e-commerce store also supports mobile clients. In a real e-commerce store application, the controller will typically be a specialized component of the underlying framework, such as a Spring MVC controller. When a user interacts with the UI to place an order, the request is mapped to the controller, which in turn interacts with the services to fulfill the request, and then informs the user about the fulfillment status. Shipping service: Connects with an external logistic web service to ship the product from the warehouse to the user’s address.Ī controller of the application interacts with the preceding services for an order.Payment service: Connects with a payment gateway to process the order payment.Inventory service: Checks the warehouse database running on Oracle for the availability of the product.
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When a user places an order for a product, the following services complete the process: In addition, clients individually interacting with the subsystem classes to fulfill a business requirement can result in a significant level of complexity.Ĭonsider an order fulfillment process of an e-commerce store.
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But, often dependencies between the subsystems exist.
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We assign specific responsibilities to the subsystem classes by following the Single Responsibility Principle. When we create a system, we divide it into subsystems to reduce complexities. In this post, we will learn about the Facade pattern and how it simplifies interactions that clients need to make with subsystem classes. We already learned about the other patterns in the structural pattern family – Adapter, Bridge, Composite, and Decorator. The Facade pattern is a part of the classic Gang of Four structural pattern family.
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Facade defines a higher-level interface that makes the subsystem easier to use.”ĭesign Patterns: Elements of Reusable Object-Oriented Software Facade Pattern: Introduction “ Provide a unified interface to a set of interfaces in a subsystem.