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Posted to notifications@dubbo.apache.org by GitBox <gi...@apache.org> on 2021/08/15 00:51:54 UTC
[GitHub] [dubbo] startjava opened a new issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
startjava opened a new issue #8504:
URL: https://github.com/apache/dubbo/issues/8504
消费者的JavaConfig代码如下：
@Configuration
public class JavaConfigDubbo {
@DubboReference(group = "IServer1_A")
private IService1 iService1;
@DubboReference(group = "IServer1_B")
private IService1 iService2;
}
消费者的Controller代码如下：
@RestController
public class TestCcontroller {
@Autowired
private IService1 service1_1;
@Autowired
private IService1 service1_2;
我的问题是，控制层中的这2个变量数据类型是一样的，如何写能注入指定的实现类呢？
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[GitHub] [dubbo] kylixs edited a comment on issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
kylixs edited a comment on issue #8504:
URL: https://github.com/apache/dubbo/issues/8504#issuecomment-900795175
一般来说，当存在某个type的多个候选bean时，可以通过`@Qualifier` 来指定注入的beanName， `@DubboReference`注解处理时默认以fieldName作为beanName（如果是`@Bean`方法的方式，则由Spring创建bean）。
消费者的JavaConfig代码如下：
```java
@Configuration
public class JavaConfigDubbo {
@DubboReference(group = "IServer1_A")
private IService1 iService1;
@DubboReference(group = "IServer1_B")
private IService1 iService2;
}
```
消费者的Controller代码如下：
```java
@RestController
public class TestCcontroller {
@Qualifier("iService1")
@Autowired
private IService1 service1_1;
@Qualifier("iService2")
@Autowired
private IService1 service1_2;
}
```
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[GitHub] [dubbo] chickenlj closed issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
chickenlj closed issue #8504:
URL: https://github.com/apache/dubbo/issues/8504
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[GitHub] [dubbo] kylixs commented on issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
kylixs commented on issue #8504:
URL: https://github.com/apache/dubbo/issues/8504#issuecomment-900794261
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[GitHub] [dubbo] kylixs edited a comment on issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
kylixs edited a comment on issue #8504:
URL: https://github.com/apache/dubbo/issues/8504#issuecomment-900795175
一般来说，当存在某个type的多个候选bean时，可以通过`@Qualifier` 来指定注入的beanName， `@DubboReference`注解处理时默认以fieldName作为beanName（如果是@Bean方法的方式，则由Spring创建bean）。
消费者的JavaConfig代码如下：
```java
@Configuration
public class JavaConfigDubbo {
@DubboReference(group = "IServer1_A")
private IService1 iService1;
@DubboReference(group = "IServer1_B")
private IService1 iService2;
}
```
消费者的Controller代码如下：
```java
@RestController
public class TestCcontroller {
@Qualifier("iService1")
@Autowired
private IService1 service1_1;
@Qualifier("iService2")
@Autowired
private IService1 service1_2;
}
```
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[GitHub] [dubbo] dkisser commented on issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
dkisser commented on issue #8504:
URL: https://github.com/apache/dubbo/issues/8504#issuecomment-899482230
https://www.zhihu.com/question/39356740
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[GitHub] [dubbo] kylixs edited a comment on issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
kylixs edited a comment on issue #8504:
URL: https://github.com/apache/dubbo/issues/8504#issuecomment-900795175
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[GitHub] [dubbo] startjava commented on issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
startjava commented on issue #8504:
URL: https://github.com/apache/dubbo/issues/8504#issuecomment-899592477
感谢，其实写法我能解决，结合@Bean即可。
问题的本意想知道，如何不用@Bean来解决这个问题，以为DUBBO有其它的注解或属性能解决。
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[GitHub] [dubbo] kylixs commented on issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
kylixs commented on issue #8504:
URL: https://github.com/apache/dubbo/issues/8504#issuecomment-900795175
一般来说，当存在某个type的多个候选bean时，可以通过`@Qualifier` 来指定注入的beanName。
消费者的JavaConfig代码如下：
```java
@Configuration
public class JavaConfigDubbo {
@DubboReference(group = "IServer1_A")
private IService1 iService1;
@DubboReference(group = "IServer1_B")
private IService1 iService2;
}
```
消费者的Controller代码如下：
```java
@RestController
public class TestCcontroller {
@Qualifier("iService1")
@Autowired
private IService1 service1_1;
@Qualifier("iService2")
@Autowired
private IService1 service1_2;
}
```
--
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To respond to the message, please log on to GitHub and use the
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[GitHub] [dubbo] kylixs edited a comment on issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
kylixs edited a comment on issue #8504:
URL: https://github.com/apache/dubbo/issues/8504#issuecomment-900795175
一般来说，当存在某个type的多个候选bean时，可以通过`@Qualifier` 来指定注入的beanName， `@DubboReference`注解处理时默认以fieldName作为beanName。
消费者的JavaConfig代码如下：
```java
@Configuration
public class JavaConfigDubbo {
@DubboReference(group = "IServer1_A")
private IService1 iService1;
@DubboReference(group = "IServer1_B")
private IService1 iService2;
}
```
消费者的Controller代码如下：
```java
@RestController
public class TestCcontroller {
@Qualifier("iService1")
@Autowired
private IService1 service1_1;
@Qualifier("iService2")
@Autowired
private IService1 service1_2;
}
```
--
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To respond to the message, please log on to GitHub and use the
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[GitHub] [dubbo] kylixs commented on issue #8504: 注解与JavaConfig与service group分组写法的迷惑？
Posted by GitBox <gi...@apache.org>.
kylixs commented on issue #8504:
URL: https://github.com/apache/dubbo/issues/8504#issuecomment-900794261
这里涉及到Spring autowire的实现逻辑，具体可以调试一下代码： org.springframework.beans.factory.support.DefaultListableBeanFactory#determineAutowireCandidate()
如果不指定primary和priority，最后会尝试匹配beanName和fieldName/dependcyName，即如果fieldName和beanName相同就可以成功注入，如果不相同且存在多个候选bean则会报错。
```java
protected String determineAutowireCandidate(Map<String, Object> candidates, DependencyDescriptor descriptor) {
Class<?> requiredType = descriptor.getDependencyType();
String primaryCandidate = determinePrimaryCandidate(candidates, requiredType);
if (primaryCandidate != null) {
return primaryCandidate;
}
String priorityCandidate = determineHighestPriorityCandidate(candidates, requiredType);
if (priorityCandidate != null) {
return priorityCandidate;
}
// Fallback
for (Map.Entry<String, Object> entry : candidates.entrySet()) {
String candidateName = entry.getKey();
Object beanInstance = entry.getValue();
if ((beanInstance != null && this.resolvableDependencies.containsValue(beanInstance)) ||
matchesBeanName(candidateName, descriptor.getDependencyName())) {
return candidateName;
}
}
return null;
}
```
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