hadoop JniBasedUnixGroupsMappingWithFallback 源码
haddop JniBasedUnixGroupsMappingWithFallback 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/JniBasedUnixGroupsMappingWithFallback.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.List;
import java.util.Set;
import org.apache.hadoop.util.NativeCodeLoader;
import org.apache.hadoop.util.PerformanceAdvisory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class JniBasedUnixGroupsMappingWithFallback implements
GroupMappingServiceProvider {
private static final Logger LOG = LoggerFactory
.getLogger(JniBasedUnixGroupsMappingWithFallback.class);
private GroupMappingServiceProvider impl;
public JniBasedUnixGroupsMappingWithFallback() {
if (NativeCodeLoader.isNativeCodeLoaded()) {
this.impl = new JniBasedUnixGroupsMapping();
} else {
PerformanceAdvisory.LOG.debug("Falling back to shell based");
this.impl = new ShellBasedUnixGroupsMapping();
}
if (LOG.isDebugEnabled()){
LOG.debug("Group mapping impl=" + impl.getClass().getName());
}
}
@Override
public List<String> getGroups(String user) throws IOException {
return impl.getGroups(user);
}
@Override
public void cacheGroupsRefresh() throws IOException {
impl.cacheGroupsRefresh();
}
@Override
public void cacheGroupsAdd(List<String> groups) throws IOException {
impl.cacheGroupsAdd(groups);
}
@Override
public Set<String> getGroupsSet(String user) throws IOException {
return impl.getGroupsSet(user);
}
}
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