Question

对@Async方法使用以下配置：

@Configuration
@EnableAsync
public class AsyncConfig implements AsyncConfigurer {

    @Override
    public Executor getAsyncExecutor() {
        //Just to experiment
        return new SimpleAsyncTaskExecutor();
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new CustomAsyncExceptionHandler();
    }
}

有没有办法“获得”自动装配（或类似）服务的能力？

我想使用此类服务记录数据库中的错误并使用常用服务。

非工作样本：

@Component //seems pointless
public class CustomAsyncExceptionHandler extends ServiceCommons implements AsyncUncaughtExceptionHandler {
    protected Logger LOG = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private MyService myService; //always null

    @Override
    public void handleUncaughtException(Throwable throwable, Method method, Object... obj) {
        //null pointer !
        myService.doSomething(throwable);
    }
}

在@Async方法中不使用时，@ ControllerAdvice全局异常处理程序允许@Autowired字段。在这种情况下为什么不呢？这是因为异步线程管理吗？

Answer 1

我刚刚遇到了这个问题并以这种方式解决了：

@Configuration
@EnableAsync
public class MyAsyncConfigurer implements AsyncConfigurer {

    private CustomAsyncExceptionHandler customAsyncExceptionHandler;

    //...
    //other code here
    //...

    @Autowired
    public void setCustomAsyncExceptionHandler(CustomAsyncExceptionHandler customAsyncExceptionHandler) {
        this.customAsyncExceptionHandler = customAsyncExceptionHandler;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return this.customAsyncExceptionHandler;
    }
}

使用@Component 注释的自定义异步异常处理程序：

@Component
public class CustomAsyncExceptionHandler implements AsyncUncaughtExceptionHandler     {

    private MyMailService myMailService;

    @Autowired
    public void setMyMailService(MyMailService myMailService) {
        this.myMailService= myMailService;
    }

    @Override
    public void handleUncaughtException(Throwable throwable, Method method, Object... obj) {
        myMailService.sendMailToAdmin(throwable, method.getName());
    }
}

IoC 正确地注入了 myMailService 和 customAsyncExceptionHandler，没有错误。

Answer 2

我不认为我的解决方案是最优雅的，但请告诉我你的想法。我们的想法是通过使用ApplicationContextAware接口绕过自动注入机制。我的第一次尝试是让我的AsyncUncaughtExceptionHandler实现类也实现ACAware。但那没用。不知何故，这个类，甚至注释为组件或服务似乎都在Spring环境之外。所以我这样做了：

@Configuration
@EnableAsync
public class DemoAsyncConfigurer implements AsyncConfigurer, ApplicationContextAware {

  private ApplicationContext applicationContext;

在同一个班级：

@Override
  public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
    DemoAsyncExceptionHandler demoHandler = new DemoAsyncExceptionHandler(); // you can't add the parameter in this constructor, for some reason...
    demoHandler.setApplicationContext(applicationContext);
    return demoHandler;
  }

  /**
   * 
   * {@inheritDoc}
   */
  @Override
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.applicationContext = applicationContext;
  }

我的DemoAsyncExceptionHandler具有以下内容：

private ApplicationContext applicationContext;

public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.applicationContext = applicationContext;

  }

public void handleUncaughtException(Throwable throwable, Method method, Object... params) {
    UserService userService = this.applicationContext.getBean("userService", UserService.class);
    // call userService method

那很有效！希望我帮助

自定义AsyncUncaughtExceptionHandler

2 个答案: