Decoration with several interface

Question

I am always struggling with decoration + interfaces. Say I have the following \'behavior\' interfaces :

interface IFlyable { void Fly();}
interface ISwimmable {          


        

Answer 1

You will need to create separate decorators for each interface. An alternative is to use a generic interface for your services and a generic decorator. For example:

public interface ICommandService
{
   Task Execute(TCommand command);
}

public class LoggingCommandService : ICommandService
{
  public LoggingCommandService(ICommandService command, ILogger logger)
  {
    ...
  }

  public async Task Execute(TCommand command)
  {
    // log
    await this.command.Execute(command);
    // log
  }
}