事件监听器模式示例

事件监听器模式示例

// 自定义事件监听器
public interface MyEventListener extends EventListener {
    void update(MyEvent event);
}

// 监听对象
public class MyEvent extends EventObject{
    public MyEvent(Object o){
        super(o);
    }
}

// 自定义事件监听器实现类
public class MyEventListenerImpl implements MyEventListener {
    @Autowired
    private UserDao userDao;

    @Override
    public void update(MyEvent event) {
        User user = (User)event.getSource();
        userDao.update(user);
    }
}

// 需要监听的业务逻辑
public class TestServiceImpl() implements ApplicationContextAware{
    private static Map<String, ChargeEventListener> observer;

    private static ApplicationContext applicationContext;

    // 从Bean中获取监听器
    @PostConstruct
    public void init(){
        observer = applicationContext.getBeansOfType(MyEventListener.class);
    }
    
    // 获取Spring上下文
    @Override
    public void setApplicationContext(ApplicationContext ctx) throws BeansException {
        applicationContext = ctx;
    }

    // 业务逻辑
    public void test(){
        User user = new User();
        user.setName("test");
    
        /*触发监听模块*/
        for(MyEventListener value : observer.values()){
            value.update(new MyEvent(charge));
        }
    }
}