java - Spring Boot @Async 方法同步执行

Question

这与这里的另一个问题非常相似:Spring Boot @Async method in controller is executing synchronously .然而，我的 @Service 方法用 @Async 注释仍然同步执行。我已经尝试了来自不同论坛的所有方法，但没有用。希望有人能帮我弄清楚原因。如下所示的简单 spring boot 项目不起作用。

AsyncConfiguration.java

@Configuration
@EnableAsync
public class AsyncConfiguration(){}

SomeService.java

@Service
public class SomeService() {
  @Async
  public void doSomething() {
    try {
      Thread.sleep(5000L);
    } catch (Exception ignore){}
  }
}

SomeController.java

@Controller
public class SomeController() {

  @Inject SomeService someService;

  @RequestMapping(value="/", method=RequestMethod.POST)
  public String doStuff() {
    someService.doSomething();
    return "mytemplate";
  }
}

Answer 1

这是一个使用@Async 的简单示例。按照以下步骤让@Async 在您的 Spring Boot 应用程序中工作:

第 1 步:添加 @EnableAsync 注解并将 TaskExecutor Bean 添加到应用程序类。

例子:

@SpringBootApplication
@EnableAsync
public class AsynchronousSpringBootApplication {

    private static final Logger logger = LoggerFactory.getLogger(AsynchronousSpringBootApplication.class);

    @Bean(name="processExecutor")
    public TaskExecutor workExecutor() {
        ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
        threadPoolTaskExecutor.setThreadNamePrefix("Async-");
        threadPoolTaskExecutor.setCorePoolSize(3);
        threadPoolTaskExecutor.setMaxPoolSize(3);
        threadPoolTaskExecutor.setQueueCapacity(600);
        threadPoolTaskExecutor.afterPropertiesSet();
        logger.info("ThreadPoolTaskExecutor set");
        return threadPoolTaskExecutor;
    }

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

第 2 步:添加执行异步进程的方法

@Service
public class ProcessServiceImpl implements ProcessService {

    private static final Logger logger = LoggerFactory.getLogger(ProcessServiceImpl.class);

    @Async("processExecutor")
    @Override
    public void process() {
        logger.info("Received request to process in ProcessServiceImpl.process()");
        try {
            Thread.sleep(15 * 1000);
            logger.info("Processing complete");
        }
        catch (InterruptedException ie) {
            logger.error("Error in ProcessServiceImpl.process(): {}", ie.getMessage());
        }
    }
}

第三步:在Controller中添加API来执行异步处理

@Autowired
private ProcessService processService;

@RequestMapping(value = "ping/async", method = RequestMethod.GET)
    public ResponseEntity<Map<String, String>> async() {
        processService.process();
        Map<String, String> response = new HashMap<>();
        response.put("message", "Request is under process");
        return new ResponseEntity<>(response, HttpStatus.OK);
    }

我还使用这些步骤在 GitHub 上编写了一个博客和一个工作应用程序。请检查: http://softwaredevelopercentral.blogspot.com/2017/07/asynchronous-processing-async-in-spring.html