/**
 * 訂閱觀察者
 * @author Administrator
 *
 */
@Component
//標(biāo)志為多例
@Scope(value=ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class SubscriberObserver implements Observer{

  private String email;
  private String phone;
  private String username;
  @Autowired
  UserFunctionService UserFunctionService;


  @Override
  public void update(Observable o, Object arg) {
    if(o instanceof EmailAlertSubject){
      UserFunctionService.alertUserEmail(email,username);
    }
    if(o instanceof PhoneAlertSubject){
      UserFunctionService.alertUserPhone(phone,username);
    }
  }

  public String getEmail() {
    return email;
  }

  public void setEmail(String email) {
    this.email = email;
  }

  public String getPhone() {
    return phone;
  }

  public void setPhone(String phone) {
    this.phone = phone;
  }

  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public SubscriberObserver() {
    super();
    // TODO Auto-generated constructor stub
  }


}

/**
 * email提醒主題
 * @author Administrator
 *
 */
@Component
public class EmailAlertSubject extends Observable{

  public void alert(){
     this.setChanged();
     //如果用拉的方式，這么調(diào)用
     this.notifyObservers();
  }
}

/**
 * 短信提醒主題
 * @author Administrator
 *
 */
@Component
public class PhoneAlertSubject extends Observable{

  public void alert(){
     this.setChanged();
     //如果用拉的方式，這么調(diào)用
     this.notifyObservers();
  }
}

/**
 * 定時(shí)給訂閱了短信提醒和email提醒的用戶服務(wù)
 * @author Administrator
 *
 */
@Component
public class TimeAlertTaskUtil {

  @Autowired
  CommonUserService commonUserService;
  @Autowired
  JedisConnectionFactory factory;
  @Autowired
  EmailAlertSubject emailSubject;
  @Autowired
  PhoneAlertSubject phoneSubject;


  private static final String emailKeyName = "emailAlert:";
  private static final String phoneKeyName = "phoneAlert:";

  /**
   * 定時(shí)獲取需要email提醒的用戶,每10分鐘調(diào)用一次
   */
  @Scheduled(fixedDelay = 1000 * 60 * 10)
  public void alertEmailTask() {
    // 1.獲取數(shù)據(jù)庫(kù)中達(dá)到了閾值的用戶
    List<User> emails = commonUserService.getUserAlertEmailAndName();
    // 2.查看redis中是否有達(dá)到閾值，且48小時(shí)已經(jīng)通知的用戶，將其排除在觀察者行列,最終得出觀察者隊(duì)伍
    List<SubscriberObserver> informEmail = getInformObserver(emails);
    // 3.創(chuàng)建主題，添加觀察者
    addObservers(emailSubject, informEmail);
    // 4.通知
    emailSubject.alert();

    // 5.將已經(jīng)通知的觀察者信息存儲(chǔ)到reids內(nèi)，設(shè)置過(guò)期時(shí)間為一天
    setRedisCache(emails);
    // 6.將觀察者從主題中移除
    deleteObservers(emailSubject, informEmail);
  }

  /**
   * 定時(shí)獲取需要短信提醒的用戶,每10分鐘調(diào)用一次
   * 
   */
  @Scheduled(fixedDelay = 1000 * 60 * 10)
  public void alertPhoneTask() {
    // 1.獲取數(shù)據(jù)庫(kù)中達(dá)到了閾值的用戶
    List<User> phones = commonUserService.getUserAlertPhoneAndName();
    // 2.查看redis中是否有達(dá)到閾值，且今天已經(jīng)通知的用戶，將其排除在觀察者行列,最終得出觀察者隊(duì)伍
    List<SubscriberObserver> informPhones = getInformObserver(phones);

    // 3.創(chuàng)建主題，添加觀察者
    addObservers(phoneSubject, informPhones);
    // 4.通知
    phoneSubject.alert();
    // 5.將已經(jīng)通知的觀察者信息存儲(chǔ)到reids內(nèi)，設(shè)置過(guò)期時(shí)間為一天
    setRedisCache(phones);
    // 6.將觀察者從主題中移除
    deleteObservers(phoneSubject, informPhones);
  }

  /**
   * ------------------------------------------------------------------------
   * -----------------------------------------------------
   **/
  /**
   * 過(guò)濾掉今天已經(jīng)email提醒的用戶，返回真正需要提醒的觀察者列表
   * 
   * @param emails
   * @return
   */
  private List<SubscriberObserver> getInformObserver(
      List<User> users) {
    List<SubscriberObserver> obs = new ArrayList<SubscriberObserver>();
    Jedis jedis = factory.getConnection().getNativeConnection();
    for (User user : users) {
      String value;
      SubscriberObserver observer = (SubscriberObserver) SpringConfigTool
          .getBean("subscriberObserver");
      if (user.getEmail()!=null) {
        value = jedis.get(emailKeyName + user.getEmail());
        if (value == null || !value.equals("success")) {
          observer.setEmail(user.getEmail());
          observer.setUsername(user.getName());
          obs.add(observer);
        }
      } else {
        value = jedis.get(phoneKeyName + user.getPhone());
        if (value == null || !value.equals("success")) {
          observer.setPhone(user.getPhone());
          observer.setUsername(user.getName());
          obs.add(observer);
        }
      }
    }
    return obs;
  }

  /**
   * 將指定的觀察者列表添加到指定的主題
   * 
   * @param subject
   * @param list
   */
  private void addObservers(Observable subject, List<SubscriberObserver> list) {
    for (SubscriberObserver obs : list) {
      subject.addObserver(obs);
    }
  }

  private void deleteObservers(Observable subject,
      List<SubscriberObserver> list) {
    for (SubscriberObserver obs : list) {
      subject.deleteObserver(obs);
    }
  }

  /**
   * 將列表的值作為鍵，存入redis,過(guò)期時(shí)間為48小時(shí)
   * 
   * @param list
   */
  private void setRedisCache(List<User> users) {
    Jedis jedis = factory.getConnection().getNativeConnection();
    for (User user : users) {
      if (user.getEmail()!=null) {
        jedis.set(emailKeyName + user.getEmail(), "success", "NX", "EX",
            60 * 60 * 24 * 2);
      } else {
        jedis.set(phoneKeyName + user.getPhone(), "success", "NX", "EX",
            60 * 60 * 24 * 2);
      }
    }
  }
}