Spring ApplicationEvent 事件（观察者设计模式）

一. 发布ApplicationEvent（目标）

　　1）自定义TestEvent

public class TestEvent extends ApplicationEvent {

    public TestEvent(Object source) {
        super(source);
    }
}

　　2）发布

　　① ApplicationContext发布

        // 发布event并传参args
        SpringContextUtils.getApplicationContext().publishEvent(new TestEvent("args"));

　　② 实现ApplicationEventPublisherAware接口　　　　

@Service
public class DynamicRouteService implements ApplicationEventPublisherAware {

    @Autowired
    private MyInMemoryRouteDefinitionRepository repository;

    /**
     * 发布事件
     */
    private ApplicationEventPublisher publisher;

    @Override
    public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
        this.publisher = applicationEventPublisher;
    }

    /**
     * 删除路由
     *
     * @param id
     * @return
     */
    public synchronized void delete(String id) {
        try {
            repository.delete(Mono.just(id)).subscribe();
            this.publisher.publishEvent(new RefreshRoutesEvent(this));
        } catch (Exception e) {
            log.warn(e.getMessage(), e);
        }
    }
}

 

 

　　　　

二. 事件监听ApplicationListener（观察者）

　　1）自定义事件监听器

@Component
public class TestListener1 implements ApplicationListener<TestEvent> {
    @Override
    public void onApplicationEvent(TestEvent event) {
        Object obj = event.getSource();
        // 处理业务
        System.out.println("==========listerer1"+obj);
    }
}

@Component
public class TestListener2 implements ApplicationListener<TestEvent> {
    @Override
    public void onApplicationEvent(TestEvent event) {
        Object obj = event.getSource();
        // 处理业务
        System.out.println("==========listerer2"+obj);
    }
}