如何在OSGI声明服务中使用@属性注释的基数

Question

我正在将ApacheFelixSCR注释迁移到OSGI声明性服务[AEM]。在迁移过程中，我无法在DS中找到基数的精确替换。

现有的SCR实施：

@Component (ds = true, immediate = true, metatype = false, policy = ConfigurationPolicy.OPTIONAL)
@Service (SampleService.class)
public class SampleServiceImpl implements SampleService
{
   private static final int VECTOR = Integer.MIN_VALUE + 1;

    @Property (value = REPOSTING_PATTERN, cardinality = VECTOR,description = "Event reposting pattern for QueuePosting ")
    private static String EVENT_REPOSTING_PATTERN = "eventRepostingPattern";
}

现在它在OSGi声明性服务中迁移如下

  @Component (configurationPolicy = ConfigurationPolicy.OPTIONAL, immediate = true, service =SampleService.class,
   property = {SampleServiceImpl .EVENT_REPOSTING_PATTERN +"="+SampleServiceImpl .EVENT_REPOSTING_PATTERN_VALUE })
  public class SampleServiceImpl implements SampleService
   {
     private static String EVENT_REPOSTING_PATTERN = "eventRepostingPattern";
     private static String EVENT_REPOSTING_PATTERN = "eventRepostingPatternValue";
   }

在DS注释实现中，我必须映射@Property中存在的参数基数。请推荐我

Answer 1

关于@属性和基数的文档与往常一样令人困惑，但基于此，我假设它们与配置有关。您可以使用@assign和@ObjectClassDefinition注释为您的服务设置类型安全配置。基数选项可在@AttributeDefinition注释中找到。

例如erviceimpl.java

import org.osgi.framework.BundleContext;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.metatype.annotations.Designate;

@Component( immediate = true, service = ExampleService.class )
@Designate( ocd = ExampleServiceConfig.class )
public class ExampleServiceImpl implements ExampleService {
    
    @Activate
    public void activateService(BundleContext context, ExampleServiceConfig config){
        System.out.println(config.some_config());
    }
}

示例ServiceConfig。JAVA

import org.osgi.service.metatype.annotations.AttributeDefinition;
import org.osgi.service.metatype.annotations.ObjectClassDefinition;

@ObjectClassDefinition(
    name = " Example service Configuration"
)
public @interface ExampleServiceConfig {
    
    @AttributeDefinition( cardinality = 1 )
    String some_config() default "default value";
}

现在作为免责声明，我从来没有设法使用@属性定义或基数注释自己，所以可能在这里关闭。当我试图使用@属性定义来查看是否可以使用它来使我的服务配置在hawtio中变得漂亮，但可能会错过一些步骤时，遇到了基数选项。

但希望这能给你指明正确的方向。