【设计模式】JAVA Design Patterns——Business Delegate（业务委托模式）

public interface VideoStreamingService {
  void doProcessing();
}
 
@Slf4j
public class NetflixService implements VideoStreamingService {
  @Override
  public void doProcessing() {
    LOGGER.info("NetflixService is now processing");
  }
}
 
@Slf4j
public class YouTubeService implements VideoStreamingService {
  @Override
  public void doProcessing() {
    LOGGER.info("YouTubeService is now processing");
  }
}

@Setter
public class BusinessLookup {
 
  private NetflixService netflixService;
  private YouTubeService youTubeService;
 
  public VideoStreamingService getBusinessService(String movie) {
    if (movie.toLowerCase(Locale.ROOT).contains("die hard")) {
      return netflixService;
    } else {
      return youTubeService;
    }
  }
}

@Setter
public class BusinessDelegate {
 
  private BusinessLookup lookupService;
 
  public void playbackMovie(String movie) {
    VideoStreamingService videoStreamingService = lookupService.getBusinessService(movie);
    videoStreamingService.doProcessing();
  }
}

public class MobileClient {
 
  private final BusinessDelegate businessDelegate;
 
  public MobileClient(BusinessDelegate businessDelegate) {
    this.businessDelegate = businessDelegate;
  }
 
  public void playbackMovie(String movie) {
    businessDelegate.playbackMovie(movie);
  }
}

  public static void main(String[] args) {
 
    // prepare the objects
    var businessDelegate = new BusinessDelegate();
    var businessLookup = new BusinessLookup();
    businessLookup.setNetflixService(new NetflixService());
    businessLookup.setYouTubeService(new YouTubeService());
    businessDelegate.setLookupService(businessLookup);
 
    // create the client and use the business delegate
    var client = new MobileClient(businessDelegate);
    client.playbackMovie("Die Hard 2");
    client.playbackMovie("Maradona: The Greatest Ever");
  }

21:15:33.790 [main] INFO com.iluwatar.business.delegate.NetflixService - NetflixService is now processing
21:15:33.794 [main] INFO com.iluwatar.business.delegate.YouTubeService - YouTubeService is now processing