按名称在Micronaut中获取Bean

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英文:

Get bean by name in Micronaut

问题

  1. 我有一个类似如下的接口
  2. interface Task {
  3. void run(String param);
  4. }
  5. 我有很多用 @Named("same_name") 注解标记的实现
  6. 我想要实现类似于 Spring 的获取方式
  7. @Inject
  8. ApplicationContext appContext
  9. void execTask(String name, String param) {
  10. Task task = appContext.getBeam(Task.class, name);
  11. task.run(param);
  12. }
  13. 我成功地通过在bean定义中搜索注解来实现了这一点类似于
  14. Groovy代码
  15. void execTask(String name, String param) {
  16. Collection<BeanDefinition<Task>> definitions = appContext.getBeanDefinitions(Task);
  17. BeanDefinition<Task> definition = definitions.find { BeanDefinition<Task> it ->
  18. it.getAnnotation(Named)?.stringValue()?.filter { it == name }?.present;
  19. }
  20. Task task = appContext.getBean(Task, definition.declaredQualifier);
  21. task.run(param);
  22. }
  23. 但这似乎对于一个简单的操作来说有点繁琐
  24. 有没有更直接的方式呢
英文:

I have an interface that looks like.

  1. interface Task {
  2. void run(String param);
  3. }

And I have many implementations annotated with @Named("same_name")

I want to get an implementation similar to Spring:

  1. @Inject
  2. ApplicationContext appContext
  3. void execTask(String name, String param) {
  4. Task task = appContext.getBeam(Task.class, name);
  5. task.run(param);
  6. }

I managed to do this using a search for annotation in bean definitions, similar to:

(code in Groovy)

  1. void execTask(String name, String param) {
  2. Collection&lt;BeanDefinition&lt;Task&gt;&gt; definitions = appContext.getBeanDefinitions(Task)
  3. BeanDefinition&lt;Task&gt; definition = definitions.find { BeanDefinition&lt;Task&gt; it -&gt;
  4. it.getAnnotation(Named)?.stringValue()?.filter {it == name }?.present
  5. }
  6. Task task = appContext.getBean(Task, definition.declaredQualifier)
  7. task.run(param)
  8. }

but it seems like a lot for something simple.

is there a more direct way?

答案1

得分: 6

你可以通过名称限定符检索一个bean:

  1. import io.micronaut.inject.qualifiers.Qualifiers
  2. // ...
  3. void execTask(String name, String param) {
  4. Task task = appContext.getBean(Task.class,
  5. Qualifiers.byName(name));
  6. task.run(param);
  7. }
英文:

You can retrieve a bean with a name qualifier:

  1. import io.micronaut.inject.qualifiers.Qualifiers
  2. // ...
  3. void execTask(String name, String param) {
  4. Task task = appContext.getBean(Task.class,
  5. Qualifiers.byName(name));
  6. task.run(param);
  7. }

huangapple
  • 本文由 发表于 2020年10月27日 19:37:11
  • 转载请务必保留本文链接:https://go.coder-hub.com/64553631.html
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