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In this way, both hierarchies can evolve separately without affecting each other. As this problem is a classical platform independence-related problem, I will use a bridge pattern to solve this. I will break the downloader component into abstraction and implementer parts. The bridge pattern is an application of the old advice, “prefer composition over inheritance“. It becomes handy when you must subclass different times in ways that are orthogonal with one another. The client code links the desired type of remote control with a specific device object via the remote’s constructor.
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Longer bridges can be created by repeating a short arch, as was the case for Roman aqueducts. Beam bridges are the simplest type of bridge and feature a horizontal beam supported by abutments or piers. After understanding the Bridge design pattern, there might be confusion about when to use it. Please look at the following image to understand the class diagram or UML Diagram of the Bridge Design Pattern in C#.
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Now, the client will call the Abstraction Layer method, and the abstraction layer will use one of the Persistence implementations to do the operation. In the MessageSender interface (Implementor), we declared a sendMessage() method that both the TextMessageSender and EmailMessageSender (ConcreteImplementor) classes override. Observe that this class hierarchy is completely independent of the abstraction class hierarchy that we wrote earlier. We can now modify, extend, and reuse one class hierarchy without worrying about the structure and participants of the other class hierarchy. As you see here, The colors(Implementation) were separated from the shapes.
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To apply the bridge pattern to the messaging example, let’s write the abstraction class hierarchy. The bridge design pattern is used to decouple a class into two parts – abstraction and its implementation – so that both can evolve in the future without affecting each other. It increases the loose coupling between class’s abstraction and its implementation. Adding new shape types and colors to the hierarchy will grow it exponentially. For example, to add a triangle shape you’d need to introduce two subclasses, one for each color. And after that, adding a new color would require creating three subclasses, one for each shape type.
With the bridge pattern, the abstraction maintains a Has-A relationship with the implementation instead of a IS-A relationship. The Has-A relationship is achieved through composition where the abstraction maintains a reference of the implementation and forwards client requests to it. If you notice the above example, both GreenSquare and RedSquare has the same logic except for the colors. If we could extract this implementation outside of the shapes, then we can reduce the number of classes. Here I am creating two interfaces, FileDownloaderAbstraction represents the abstraction with which the client will interact; and FileDownloadImplementor which represents the implementation.
Example of Bridge Pattern
As the name suggests, arch bridges feature a loadbearing arched structure. Traditionally these were made from masonry, but they can also be made from concrete, iron, timber and steel. For single-span beam bridges, which include footbridges constructed from wood or stone across small rivers, weight and load are transferred through the endpoints of the bridge. The patterns that are related to the Bridge design pattern are the Adapter pattern and the Abstract Factory pattern. You can use the Abstract Factory pattern with the Bridge design pattern as the Abstract Factory pattern can create and configure the Bridge.
The Bridge design pattern is a software design pattern that is used to decouple an abstraction from its implementation. It can separate the responsibility of an object into two separate parts – the abstraction and the implementation. Suppose you are working on a project that involves communication or interaction between different cross-platform applications.
On the other hand, the Bridge pattern allows the abstraction and implementation to vary independently. Suppose you are working on a project where both abstraction and implementation are open to extension. In that case, the Bridge pattern allows you to collab different abstractions and implementations that you can extend independently of each other.
Bridge Design Pattern in Java
A cantilever is a structure that projects horizontally and is supported at only one end. Cantilever bridges are formed by arms that extend outwards to meet at the centre or outwards from either side of a central tower. In 2018, Italian architect Renzo Piano designed a €202 million beam bridge for his hometown of Genoa (pictured), after the previous bridge collapsed in a storm. My name is Kristijan Kralj, and I am a C# software developer with 10 years of experience.I have worked on various software projects ranging from simple programs to large enterprise systems.
However, the intent of the Adapter pattern is to make one or more classes' interfaces look the same as that of a particular class. The Bridge pattern is designed to separate a class's interface from its implementation so you can vary or replace the implementation without changing the client code. The Bridge suggests that you extract a separate class hierarchy for each of the dimensions. The original class delegates the related work to the objects belonging to those hierarchies instead of doing everything on its own. You can develop the remote control classes independently from the device classes.
With the bridge pattern, you can test them independently, and then create mock objects of the implementation classes to test the refined abstraction classes. The bridge pattern looks a lot like the adapter pattern and is a common cause of confusion. However, while the adapter pattern helps two incompatible interfaces work together, the bridge pattern helps decouple the abstraction and implementation by creating two separate class hierarchies.
As shown in the diagram, the class Animal is an abstraction (or interface) such that the three animals inherit from it. Each animal individually implements their own specific logic as to how they move(). Therefore, they declare their own move method.However, we are still not quite there yet. The pattern’s intent is to separate the move()logic from the abstraction. In this example, the code within the Animal classes should only be about defining the animal object representations.
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