package apusic.myshop.customer.web;import java.rmi.RemoteException;import apusic.myshop.control.GeneralFailureException;import apusic.myshop.customer.model.CustomerModel;import apusic.myshop.control.web.ModelUpdateListener;import apusic.myshop.control.web.ModelManager;import apusic.myshop.customer.ejb.Customer;import apusic.myshop.util.JNDINames;//觀察者public class CustomerWebImpl extends CustomerModel implements ModelUpdateListener {//主題  private ModelManager mm;//顧客實體  private Customer custEjb;//構(gòu)造函數(shù)初始化  public CustomerWebImpl() {    // This bean should created by the request processor    System.out.println("CustomerWebImpl: This bean should not be instanciated from a JSP");  }//初始化觀察者并添加到主題中  public CustomerWebImpl(ModelManager mm) {    super(null, null, null, null, null, null,      null, null, null, null, null, null, null);    this.mm = mm;	  mm.addListener(JNDINames.CUSTOMER_EJBHOME, this);  }//觀察者更新自己  public void performUpdate() {	  // Get data from the EJB	  if (custEjb == null) {      custEjb = mm.getCustomerEJB();	  }	  try {      if (custEjb != null) copy(custEjb.getDetails());	  } catch (RemoteException re) {      throw new GeneralFailureException(re);    }  }}