spring event demo

1.自定义event

/**
 * @author fuli
 */
public class ChannelChangeEvent extends ApplicationEvent {
    /**
     * Create a new ApplicationEvent.
     *
     * @param source the object on which the event initially occurred (never {@code null})
     */
    public ChannelChangeEvent(ChannelDTO source) {
        super(source);
    }
    public ChannelDTO getChannelDTO(){
        //校验
        Preconditions.checkState( source != null);
        return (ChannelDTO) this.source;
    }
}

2.创建listener

/**
 * @author fuli
 */
@Component
@EnableAsync
public class ChannelListener {
    /**
    *引入需要执行的service
    */
    @Autowired
    private ChannelBizService channelBizService;
      /**
      * 开启监听事件
      */
    @EventListener
    /**
    * 开启异步执行
    */
    @Async
    public void change(ChannelChangeEvent event) {
        ChannelDTO dto = event.getChannelDTO();
        /**
        *监听后 需要执行的业务代码
        */
        channelBizService.putChannel(dto);
    }
}

3.在业务代码中发布event

@Service
public class DemoService{
    /**
    *引入eventPublisher
    */
    @Resource
    private ApplicationEventPublisher publisher;

    public void demoMethod(ChannelDTO channelDTO) {
         //todo 正常业务代码

        /**
        *发布event
        */
        publisher.publishEvent(new ChannelChangeEvent(dto));
    }
}