Petstore源码追踪记(3)－商业逻辑处理(五)

          Locale locale =
I18nUtil.getLocaleFromString(profile.getPreferredLanguage());
          session.setAttribute(PetstoreKeys.LOCALE, locale);
      }
   }
}
以下略...

     SignOnNotifier会透过PetstoreComponentManager取得ShoppingClientFacade
reference，ShoppingClientFacade是Petstore在EJB tier的代理接口，Web tier所
有Request均需透过它来存取所需资料，这个Design Pattern的好处是可以降低EJB tier与Web tier间的藕合性，将商业逻辑集中控管在EJB tier。

PetstoreComponentManager，源码在
D:\petstore1.3.1\src\apps\petstore\src\com\sun\j2ee\blueprints\petstore\controller\web\
PetstoreComponentManager.java，约110列：

public CustomerLocal  getCustomer(HttpSession session) {
   ShoppingControllerLocal scEjb = getShoppingController(session);
   try {
　　　//取得ShoppingClientFacade reference
      ShoppingClientFacadeLocal scf = scEjb.getShoppingClientFacade();
      //scf.setUserId(userId);
      //取得CustomerLocal reference
      return scf.getCustomer();
   } catch (FinderException e) {
      System.err.println("PetstoreComponentManager finder error: " + e);
   } catch (Exception e) {
      System.err.println("PetstoreComponentManager error: " + e);
   }
　　return null;
}

ShoppingClientFacadeLocalEJB为Session Bean，源码在
D:\petstore1.3.1\src\apps\petstore\src\com\sun\j2ee\blueprints\petstore\controller\ejb\
ShoppingClientFacadeLocalEJB.java，约101列：

/*
 * Asume that the customer userId has been set
 */
public CustomerLocal getCustomer() throws FinderException {
   //请加入侦察码
   System.out.println("ShoppingClientFacadeLocalEJB.getCustomer()");
   if (userId == null) {
      throw new GeneralFailureException("ShoppingClientFacade: failed to look
up name of customer: userId is not set" );
   }
   try {
       ServiceLocator sl = new ServiceLocator();
       CustomerLocalHome home =(CustomerLocalHome)
           sl.getLocalHome(JNDINames.CUSTOMER_EJBHOME);
       customer = home.findByPrimaryKey(userId);
    } catch (ServiceLocatorException slx) {
       throw new GeneralFailureException("ShoppingClientFacade: failed to look
up name of customer: caught " + slx);
    }
    return customer;
}

CustomerEJB为Entity Bean，它与AccountEJB有一对一关系，AccountEJB也与ContactInfoEJB有一对一关系，三者皆为Entity Bean，直接对应资料库资料表CustomerEJBTable, AccountEJBTable, ContactInfoEJBTable，源码在D:\petstore1.3.1\src\components\customer\src\com\sun\j2ee\blueprints\customer\

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