Question

在某些情况下，例如在Spring应用@EnableBinding上启用绑定，ContextRefreshedEvent开始被触发多次。

例如，

public interface MessageBinding {
    @Input("test")
    KStream<Long, String> messagesIn();
}

@EnableBinding(MessageBinding.class)
@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Component
    public static class ComponentX {

        @Autowired
        ApplicationContext applicationContext;

        @EventListener
        public void onApplicationEvent(ContextRefreshedEvent event) {
            System.out.println("Fired event");
        }
    }

如果您删除@EnableBinding批注，ContextRefreshedEvent将仅被触发一次。

如果添加它，则该事件将被触发5次。

Answer 1

您需要像这样检查特定的ApplicationContext：

@Autowired
ApplicationContext applicationContext;

@EventListener
public void onApplicationEvent(ContextRefreshedEvent event) {
    if (event.getApplicationContext().equals(this.applicationContext)) {
        System.out.println("Fired only once!");
    }
}

Spring框架：ContextRefreshedEvent被多次触发

1 个答案: