Hadoop中InterfaceAudience 注解

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@InterfaceAudience.Public： 对所有工程和应用可用
@InterfaceAudience.LimitedPrivate： 仅限于某些特定工程，如Comomn，HDFS等
@InterfaceAudience.Private： 仅限于Hadoop

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/**

?* Annotation to inform users of a package, class or method's intended audience.

?*/

@InterfaceAudience.Public

@InterfaceStability.Evolving

public class InterfaceAudience {

? /**

? ?* Intended for use by any project or application.

? ?*/

? @Documented public @interface Public {};

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? /**

? ?* Intended only for the project(s) specified in the annotation.

? ?* For example, "Common", "HDFS", "MapReduce", "ZooKeeper", "HBase".

? ?*/

? @Documented public @interface LimitedPrivate {

? ? String[] value();

? };

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? /**

? ?* Intended for use only within Hadoop itself.

? ?*/

? @Documented public @interface Private {};

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? private InterfaceAudience() {} // Audience can't exist on its own

}

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