mailorderapprovalmdb.java

sun公司的petstore,一个J2ee的示例应用程序.

/*
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 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
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package com.sun.j2ee.blueprints.opc.customerrelations.ejb;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Locale;
import java.net.URL;

import javax.ejb.EJBException;
import javax.ejb.FinderException;
import javax.ejb.MessageDrivenBean;
import javax.ejb.MessageDrivenContext;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.TextMessage;
import javax.jms.MessageListener;
import javax.xml.transform.dom.DOMSource;

import com.sun.j2ee.blueprints.xmldocuments.OrderApproval;
import com.sun.j2ee.blueprints.xmldocuments.ChangedOrder;
import com.sun.j2ee.blueprints.xmldocuments.XMLDocumentException;
import com.sun.j2ee.blueprints.opc.transitions.MailOrderApprovalTransitionDelegate;
import com.sun.j2ee.blueprints.mailer.ejb.Mail;
import com.sun.j2ee.blueprints.purchaseorder.ejb.PurchaseOrderLocal;
import com.sun.j2ee.blueprints.purchaseorder.ejb.PurchaseOrderLocalHome;
import com.sun.j2ee.blueprints.servicelocator.ServiceLocatorException;
import com.sun.j2ee.blueprints.servicelocator.ejb.ServiceLocator;
import com.sun.j2ee.blueprints.processmanager.transitions.*;


/**
 * MailOrderApprovalMDB receives a JMS message containing an OrderApproval
 * xml message that has a list of user's orders that . It builds a mail
 * message pr each order that it then sends to the mailer service so that
 * the customer gets email
 */
public class MailOrderApprovalMDB implements MessageDrivenBean, MessageListener {

  private static final String MAIL_SUBJECT = "Java Pet Store Order Status: ";
  private static final String ORDER_APPROVAL_STYLE_SHEET =
                "/com/sun/j2ee/blueprints/opc/rsrc/xsl/OrderApproval.xsl";
  private Context context;
  private MessageDrivenContext mdc = null;
  private boolean sendConfirmationMail = false;
  private MailContentXDE mailContentXDE;
  private TransitionDelegate transitionDelegate;
  private PurchaseOrderLocalHome  poHome;
  private URL entityCatalogURL;
  private boolean validateXmlOrderApproval;


  public MailOrderApprovalMDB() {
  }

  public void ejbCreate() {
    try {
      ServiceLocator serviceLocator   = new ServiceLocator();
      sendConfirmationMail = serviceLocator.getBoolean(JNDINames.SEND_APPROVAL_MAIL);
      poHome = (PurchaseOrderLocalHome)serviceLocator.getLocalHome(JNDINames.PURCHASE_ORDER_EJB);
      entityCatalogURL = serviceLocator.getUrl(JNDINames.XML_ENTITY_CATALOG_URL);
      validateXmlOrderApproval = serviceLocator.getBoolean(JNDINames.XML_VALIDATION_ORDER_APPROVAL);
      transitionDelegate = new MailOrderApprovalTransitionDelegate();
      transitionDelegate.setup();
      mailContentXDE = new MailContentXDE(ORDER_APPROVAL_STYLE_SHEET);
    } catch (ServiceLocatorException se) {
      throw new EJBException(se);
    } catch (TransitionException te) {
      throw new EJBException(te);
    } catch (MailContentXDE.FormatterException exception) {
      throw new EJBException(exception);
    }
  }

  /**
   * Receive a JMS Message containing the OrderApproval xml to
   * generate Mail xml messages for each customer in the list.
   * The Mail xml mesages contain html presentation
   */
  public void onMessage(Message recvMsg) {
    TextMessage recdTM = null;
    String recdText = null;
    Collection result = null;

    try {
      recdTM = (TextMessage)recvMsg;
      recdText = recdTM.getText();
      if (sendConfirmationMail) {
        result = doWork(recdText);
        doTransition(result);
      }
    } catch(XMLDocumentException xde) {
      throw new EJBException(xde);
    } catch(TransitionException te) {
      throw new EJBException(te);
    } catch  (JMSException je) {
      throw new EJBException(je);
    } catch (MailContentXDE.FormatterException mfe) {
      throw new EJBException(mfe);
    } catch  (FinderException fe) {
      throw new EJBException(fe);
    }
  }

  public void setMessageDrivenContext(MessageDrivenContext mdc) {
    this.mdc = mdc;
  }

  public void ejbRemove() {
  }

  /**
   * update PO EJB based on list of order status updates and approvals
   * Also call the doTransition method for each order, so that the customer
   * will receive an email.
   */
  private Collection doWork(String xmlMessage) throws JMSException,
                                                XMLDocumentException,
                                                MailContentXDE.FormatterException,
                                                FinderException,
                                                TransitionException {

      ArrayList mailingList = new ArrayList();
      PurchaseOrderLocal po = null;
      OrderApproval approval = OrderApproval.fromXML(xmlMessage, entityCatalogURL, validateXmlOrderApproval);

      Collection coll = approval.getOrdersList();
      Iterator it = coll.iterator();
      while(it!= null && it.hasNext()) {
        ChangedOrder co = (ChangedOrder) it.next();
        String subject = MAIL_SUBJECT +  co.getOrderId();
        po = poHome.findByPrimaryKey(co.getOrderId());
        String emailAddress = po.getPoEmailId();
        mailContentXDE.setDocument(new DOMSource(co.toDOM()));
        mailContentXDE.setLocale(LocaleUtil.getLocaleFromString(po.getPoLocale()));
        String message = mailContentXDE.getDocumentAsString();

        //build  mail message as xml
        Mail mailMsg = new Mail(emailAddress, subject, message);
        String xmlMail = mailMsg.toXML();
        mailingList.add(xmlMail);

      }//end while
      return mailingList;
  }

  /**
   * send a Mail message to mailer service, so customer gets an email
   */
  private void doTransition(Collection mailingList) throws TransitionException {
    TransitionInfo info = new TransitionInfo(mailingList);
    transitionDelegate.doTransition(info);
  }
}