hadoop GroupMappingServiceProvider 源码
haddop GroupMappingServiceProvider 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/GroupMappingServiceProvider.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.security;
import java.io.IOException;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
/**
* An interface for the implementation of a user-to-groups mapping service
* used by {@link Groups}.
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface GroupMappingServiceProvider {
public static final String GROUP_MAPPING_CONFIG_PREFIX = CommonConfigurationKeysPublic.HADOOP_SECURITY_GROUP_MAPPING;
/**
* Get all various group memberships of a given user.
* Returns EMPTY list in case of non-existing user
* @param user User's name
* @return group memberships of user
* @throws IOException raised on errors performing I/O.
*/
public List<String> getGroups(String user) throws IOException;
/**
* Refresh the cache of groups and user mapping
* @throws IOException raised on errors performing I/O.
*/
public void cacheGroupsRefresh() throws IOException;
/**
* Caches the group user information
* @param groups list of groups to add to cache
* @throws IOException raised on errors performing I/O.
*/
public void cacheGroupsAdd(List<String> groups) throws IOException;
/**
* Get all various group memberships of a given user.
* Returns EMPTY set in case of non-existing user
* @param user User's name
* @return set of group memberships of user
* @throws IOException raised on errors performing I/O.
*/
default Set<String> getGroupsSet(String user) throws IOException {
//Override to form the set directly to avoid another conversion
return new LinkedHashSet<>(getGroups(user));
}
}
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