Bridge pattern

De Banane Atomic
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Description

Decouple an abstraction from its implementation so that the two can vary independently.

  • Select or switch implementations at runtime
  • Replace the implementation by another one without having to modify the referencing class by using an interface
  • It can also be thought of as two layers of abstraction

Exemple

  • The client can change the *Logger classes by another without having to modify the UserService.
ILogger.cs
public interface ILogger
{
    void WriteLine(string text);
}
ConsoleLogger
public class ConsoleLogger : ILogger
{
    public void WriteLine(string text)
    {
        Console.WriteLine(text);
    }
}
IUserService.cs
public interface IUserService
{
    void ChangePassword(int userId, string newPassword);
}
UserService.cs
public class UserService : IUserService
{
    private ILogger logger;

    public UserService(ILogger logger)
    {
        this.logger = logger;
    }

    public void ChangePassword(int userId, string newPassword)
    {
        logger.WriteLine($"Password has been change for user {userId}.");
    }
}
Csharp.svg
IUserService userService = new UserService(new ConsoleLogger());
userService.ChangePassword(1, "0000");