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+---
+layout: pattern
+title: Business Delegate
+folder: business-delegate
+permalink: /patterns/business-delegate/
+categories: Structural
+tags:
+ - Decoupling
+---
+
+## 作用
+
+业务委托模式（译者：国内也有翻译成业务代表模式）在表现层和业务层之间增加了一个抽象层。通过使用该模式，我们获得了各层之间的松散耦合，并封装了关于如何定位、连接和与构成应用程序的业务对象进行交互的知识。
+
+## 解释
+
+真实世界的案例
+
+> 一个手机应用程序承诺将现有的任何电影传输到你的手机上。它捕获了用户的搜索关键字内容，并将其传递给业务委托层。业务委托层选择最合适的视频流服务，并从该服务进行视频播放。
+
+简而言之
+
+> 业务委托模式在表现层和业务层之间增加了一个抽象层。
+
+维基百科的解释
+
+> Business delegate is a Java EE design pattern. This pattern is directing to reduce the coupling 
+> in between business services and the connected presentation tier, and to hide the implementation 
+> details of services (including lookup and accessibility of EJB architecture). Business delegates 
+> acts as an adaptor to invoke business objects from the presentation tier.
+>
+> 业务委托模式是一种 Java EE 设计模式。这种模式旨在减少业务服务和所连接的表现层之间的耦合度，并隐藏服务的实现细节（包括 EJB 架构的查询和可访问性）。业务代表作为一个适配器，从表现层调用业务对象。
+
+**编程示例**
+
+首先，我们实现了一个视频流服务的抽象，和几个具体实现。
+
+```java
+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");
+  }
+}
+```
+
+接下来，我们实现一个查询服务，用于决定使用哪个视频流服务。
+
+```java
+@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;
+    }
+  }
+}
+```
+
+业务委托层使用业务查询，将电影播放请求路由到合适的视频流服务。
+
+```java
+@Setter
+public class BusinessDelegate {
+
+  private BusinessLookup lookupService;
+
+  public void playbackMovie(String movie) {
+    VideoStreamingService videoStreamingService = lookupService.getBusinessService(movie);
+    videoStreamingService.doProcessing();
+  }
+}
+```
+
+移动客户端利用业务委托来调用业务层。
+
+```java
+public class MobileClient {
+
+  private final BusinessDelegate businessDelegate;
+
+  public MobileClient(BusinessDelegate businessDelegate) {
+    this.businessDelegate = businessDelegate;
+  }
+
+  public void playbackMovie(String movie) {
+    businessDelegate.playbackMovie(movie);
+  }
+}
+```
+
+最后，我们展示一下这个示例完整的操作。
+
+```java
+  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");
+  }
+```
+
+以下是终端输出的内容。
+
+```
+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
+```
+
+## 类图
+
+![alt text](../../business-delegate/etc/business-delegate.urm.png "Business Delegate")
+
+## 相关模式
+
+* [Service locator pattern](https://java-design-patterns.com/patterns/service-locator/)
+
+## 适用场景
+
+业务委托模式的适用场景：
+
+* 你希望表现层和业务层之间是松耦合的。
+* 你想要协调对多个业务服务的调用。
+* 你想要对服务查询、服务调用进行封装。
+
+## 教程
+
+* [Business Delegate Pattern at TutorialsPoint](https://www.tutorialspoint.com/design_pattern/business_delegate_pattern.htm)
+
+## 鸣谢
+
+* [J2EE Design Patterns](https://www.amazon.com/gp/product/0596004273/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596004273&linkCode=as2&tag=javadesignpat-20&linkId=48d37c67fb3d845b802fa9b619ad8f31)
+* [Core J2EE Patterns: Best Practices and Design Strategies](https://www.amazon.com/gp/product/0130648841/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=javadesignpat-20&creative=9325&linkCode=as2&creativeASIN=0130648841&linkId=a0100de2b28c71ede8db1757fb2b5947)