java - Spring SimpleThreadScope 未在@Components 上正确 Autowiring

Question

我有一个 Spring Boot 应用程序，我需要有线程绑定(bind)的 bean。我想要需要使用 Spring 的 SimpleThreadScope 的解决方案。我尝试将它 Autowiring 到 @Components 但根据我打印的日志，看起来 Spring 不会为每个生成的线程创建一个新的 bean。如何正确 Autowiring /配置 bean？

这是我的 Controller

@RestController
public class Controller {
  @Autowired
  private DummyClass dummyClass;

  @Autowired
  private DummyService1 svc;

  @PostMapping  
  public Result myPostMethod (@RequestBody Request request) {    
    LOGGER.info("myPostMethod " + Thread.currentThread().getName() + " " + Integer.toHexString(this.dummyClass.hashCode()));
    this.svc.doSomething();

    return new Result();
  }
}

我的示例服务

@Service
public class DummyService1 {

  @Autowired
  private DummyClass dummyClass;

  @Autowired
  private DummyService2 service;

  public void doSomething () {
    LOGGER.info("doSomething " + Thread.currentThread().getName() + " " + Integer.toHexString(this.dummyClass.hashCode()));

    this.service.doSomething2();
  }
}

@Service
public class DummyService2 {  

  @Autowired
  private DummyClass dummyClass;

  public void doSomething2 () {
    LOGGER.info("doSomething2 " + Thread.currentThread().getName() + " " + Integer.toHexString(this.dummyClass.hashCode()));
  }
}

我的配置

@Configuration
public class MyConfig implements WebMvcConfigurer {

  @Bean
  @Scope(value = "thread", proxyMode = ScopedProxyMode.TARGET_CLASS)  
  public DummyClass dummyClass () {
    DummyClass ctx = new DummyClass();
    return ctx;
  }

  @Bean
  public static BeanFactoryPostProcessor beanFactoryPostProcessor () {
    return new CustomScopeRegisteringBeanFactoryPostProcessor();
  }
}

public class CustomScopeRegisteringBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
  @Override
  public void postProcessBeanFactory (ConfigurableListableBeanFactory beanFactory) throws BeansException {
    beanFactory.registerScope("thread", new SimpleThreadScope());
  }
}

2次执行后的实际输出

myPostMethod http-nio-8080-exec-4 81823b32
doSomething http-nio-8080-exec-4 81823b32
doSomething2 http-nio-8080-exec-4 81823b32

myPostMethod http-nio-8080-exec-8 81823b32
doSomething http-nio-8080-exec-8 81823b32
doSomething2 http-nio-8080-exec-8 81823b32

2次执行后的预期输出

myPostMethod http-nio-8080-exec-4 81823b32
doSomething http-nio-8080-exec-4 81823b32
doSomething2 http-nio-8080-exec-4 81823b32

myPostMethod http-nio-8080-exec-8 9a5170d
doSomething http-nio-8080-exec-8 9a5170d
doSomething2 http-nio-8080-exec-8 9a5170d

我注意到如果我在 DummyClass 中执行一个方法(set 或 get)，每个线程都会创建一个新实例。我的问题是，新创建的对象没有被注入(inject)组件(DummyService1 和 DummyService2)

Answer 1

WebApplicationContext.SCOPE_REQUEST 是始终为每个请求提供不同 bean 的 Web 感知范围的一部分

@Scope(value = WebApplicationContext.SCOPE_REQUEST, proxyMode = ScopedProxyMode.TARGET_CLASS)