hadoop JniBasedUnixGroupsMapping 源码
haddop JniBasedUnixGroupsMapping 代码
文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/JniBasedUnixGroupsMapping.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.Arrays;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.apache.commons.collections.CollectionUtils;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.util.NativeCodeLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A JNI-based implementation of {@link GroupMappingServiceProvider}
* that invokes libC calls to get the group
* memberships of a given user.
*/
@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
@InterfaceStability.Evolving
public class JniBasedUnixGroupsMapping implements GroupMappingServiceProvider {
private static final Logger LOG =
LoggerFactory.getLogger(JniBasedUnixGroupsMapping.class);
static {
if (!NativeCodeLoader.isNativeCodeLoaded()) {
throw new RuntimeException("Bailing out since native library couldn't " +
"be loaded");
}
anchorNative();
LOG.debug("Using JniBasedUnixGroupsMapping for Group resolution");
}
/**
* Set up our JNI resources.
*
* @throws RuntimeException if setup fails.
*/
native static void anchorNative();
/**
* Get the set of groups associated with a user.
*
* @param username The user name
*
* @return The set of groups associated with a user.
*/
native static String[] getGroupsForUser(String username);
/**
* Log an error message about a group. Used from JNI.
*/
static private void logError(int groupId, String error) {
LOG.error("error looking up the name of group " + groupId + ": " + error);
}
@Override
public List<String> getGroups(String user) throws IOException {
return Arrays.asList(getGroupsInternal(user));
}
@Override
public Set<String> getGroupsSet(String user) throws IOException {
String[] groups = getGroupsInternal(user);
Set<String> result = new LinkedHashSet(groups.length);
CollectionUtils.addAll(result, groups);
return result;
}
private String[] getGroupsInternal(String user) throws IOException {
String[] groups = new String[0];
try {
groups = getGroupsForUser(user);
} catch (Exception e) {
if (LOG.isDebugEnabled()) {
LOG.debug("Error getting groups for " + user, e);
} else {
LOG.info("Error getting groups for " + user + ": " + e.getMessage());
}
}
return groups;
}
@Override
public void cacheGroupsRefresh() throws IOException {
// does nothing in this provider of user to groups mapping
}
@Override
public void cacheGroupsAdd(List<String> groups) throws IOException {
// does nothing in this provider of user to groups mapping
}
}
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