hadoop InterfaceAudience 源码
haddop InterfaceAudience 代码
文件路径：/hadoop-common-project/hadoop-annotations/src/main/java/org/apache/hadoop/classification/InterfaceAudience.java
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.classification;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* Annotation to inform users of a package, class or method's intended audience.
* Currently the audience can be {@link Public}, {@link LimitedPrivate} or
* {@link Private}. <br>
* All public classes must have InterfaceAudience annotation. <br>
* <ul>
* <li>Public classes that are not marked with this annotation must be
* considered by default as {@link Private}.</li>
*
* <li>External applications must only use classes that are marked
* {@link Public}. Avoid using non public classes as these classes
* could be removed or change in incompatible ways.</li>
*
* <li>Hadoop projects must only use classes that are marked
* {@link LimitedPrivate} or {@link Public}</li>
*
* <li> Methods may have a different annotation that it is more restrictive
* compared to the audience classification of the class. Example: A class
* might be {@link Public}, but a method may be {@link LimitedPrivate}
* </li></ul>
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public class InterfaceAudience {
/**
* Intended for use by any project or application.
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
public @interface Public {};
/**
* Intended only for the project(s) specified in the annotation.
* For example, "Common", "HDFS", "MapReduce", "ZooKeeper", "HBase".
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
public @interface LimitedPrivate {
String[] value();
};
/**
* Intended for use only within Hadoop itself.
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
public @interface Private {};
private InterfaceAudience() {} // Audience can't exist on its own
}
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