Spring编程bean自动装配为代理而不是目标

Question

我创建了一个注释，用于创建用环境中的值填充的ThreadPoolTask​​Executors。但是，当我自动装载这个bean时，它给了我一个代理并调用代理上的方法给出了错误的值。

如果我手动访问目标类，那么我会得到正确的值。

Executor exec = (Executor) ((Advised) executor).getTargetSource().getTarget(); 
ThreadPoolTaskExecutor taskExec = (ThreadPoolTaskExecutor) exec; 

我一直在抓我的头一阵子，为什么我得到一个代理bean，但似乎无法弄清楚。

我使用注释导入实现ImportBeanDefinitionRegistrar的注册器类来注册bean。注册商代码如下：

public class ExecutorEnumerationRegistrar implements ImportBeanDefinitionRegistrar, EnvironmentAware { 

    public static final String CORE_POOL_SIZE = "corePoolSize"; 
    public static final String MAX_POOL_SIZE = "maxPoolSize"; 
    public static final String QUEUE_CAPACITY = "queueCapacity"; 
    public static final String THREAD_NAME_PREFIX = "threadNamePrefix"; 
    private static final String REJECTED_EXECUTION_HANDLER = "rejectedExecutionHandler"; 
    private static final String NAMES = "names"; 
    private static final String REJECTED_HANDLER = "rejectedHandler"; 
    private Environment env; 

    @Override 
    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) { 
     Map<String, Object> attrs = importingClassMetadata.getAnnotationAttributes(ThreadPoolTaskExecutorCreator.class.getName(), true); 
     final String[] beanNames = (String[]) attrs.get(NAMES); 
     final String[] policyClass = (String[]) attrs.get(REJECTED_HANDLER); 
     for (int x = 0; x < beanNames.length; x++) { 
      createAndRegisterBean(beanNames[x], policyClass[x], registry); 
     } 
    } 

    private void createAndRegisterBean(String name, String policyClass, BeanDefinitionRegistry registry) { 
     GenericBeanDefinition bd = new GenericBeanDefinition(); 
     bd.setBeanClass(ThreadPoolTaskExecutor.class); 
     bd.setAutowireCandidate(true); 
     bd.setRole(BeanDefinition.ROLE_INFRASTRUCTURE); 
     MutablePropertyValues mpv = bd.getPropertyValues(); 
     populateProperties(mpv, name, policyClass); 
     registry.registerBeanDefinition(name, bd); 
    } 

    private void populateProperties(MutablePropertyValues mpv, String name, String policyClass) { 
     mpv.add(CORE_POOL_SIZE, Integer.valueOf(env.getProperty(name + "." + CORE_POOL_SIZE))); 
     mpv.add(MAX_POOL_SIZE, Integer.valueOf(env.getProperty(name + "." + MAX_POOL_SIZE))); 
     mpv.add(QUEUE_CAPACITY, Integer.valueOf(env.getProperty(name + "." + QUEUE_CAPACITY))); 
     try { 
      mpv.add(REJECTED_EXECUTION_HANDLER, Class.forName(policyClass).newInstance()); 
     } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) { 
      e.printStackTrace(); 
     } 
     mpv.add(THREAD_NAME_PREFIX, name + "-"); 
    } 

    @Override 
    public void setEnvironment(Environment environment) { 
     env = environment; 
    } 

} 

注释导入注册地：

@Retention(RetentionPolicy.RUNTIME) 
@Target(ElementType.TYPE) 
@Documented 
@Import(ExecutorEnumerationRegistrar.class) 
public @interface ThreadPoolTaskExecutorCreator{ 

    String[] names(); 

    String[] rejectedHandler() default ThreadPoolPolicyHandlers.CALLER_RUNS_POLICY; 

} 

我已经用下面的代码进行测试： 春天引导类：

@EnableDiscoveryClient 
@ComponentScan("my.test.classes") 
@ThreadPoolTaskExecutorCreator(names = {"testExecutor"}, rejectedHandler = ThreadPoolPolicyHandlers.DISCARD_POLICY) 
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, 
    SessionAutoConfiguration.class, 
    DataSourceTransactionManagerAutoConfiguration.class, 
    JpaRepositoriesAutoConfiguration.class, 
    JndiDataSourceAutoConfiguration.class, 
    JndiConnectionFactoryAutoConfiguration.class, 
    RedisAutoConfiguration.class, RedisRepositoriesAutoConfiguration.class}) 
public class TestBoot { 

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

从春天所有版本-boot-starter-parent 1.4.5.RELEASE

我写了一个JUnit测试检查值并通过。 唯一一次不起作用的是当我在Spring Boot eureka应用程序中自动装入它时。有什么我可以做的，它不会自动装载代理bean？我查阅了文档并查看了所有相关的类，但是我没有看到与它为什么是代理相关的任何内容。另外，为什么当通过代理访问时会产生不正确的值？

Answer 1

好像你缺少的代码注册实例您ImportBeanDefinitionRegistrar的（在你的例子是ExecutorEnumerationRegistrar） 因此，有两种方式注册ImportBeanDefinitionRegistrar直接使用@Import注释或实现ImportSelector接口，它可以给你更多通用配置选项。

为了您的情况，只需在Configuration类中添加@Import({ExecutorEnumerationRegistrar.class})即可。

@EnableDiscoveryClient 
@ComponentScan("my.test.classes") 
@ThreadPoolTaskExecutorCreator(names = {"testExecutor"}, rejectedHandler = ThreadPoolPolicyHandlers.DISCARD_POLICY) 
// THIS IS REQUIRED 
@Import({ExecutorEnumerationRegistrar.class}) 
// See Above 
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, 
SessionAutoConfiguration.class, 
DataSourceTransactionManagerAutoConfiguration.class, 
JpaRepositoriesAutoConfiguration.class, 
JndiDataSourceAutoConfiguration.class, 
JndiConnectionFactoryAutoConfiguration.class, 
RedisAutoConfiguration.class, RedisRepositoriesAutoConfiguration.class}) 
public class TestBoot { 

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

，并只记得自动装配的ThreadPoolTaskExecutor实例时使用的@Qualifier。看示例组件

@Component 
public class Component { 

    @Autowired 
    @Qualifier("testExecutor") 
    private ThreadPoolTaskExecutor exec; 

    // you methods 
}