hadoop XAttrStorage 源码
haddop XAttrStorage 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/XAttrStorage.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.hdfs.server.namenode;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.XAttr;
import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
/**
* XAttrStorage is used to read and set xattrs for an inode.
*/
@InterfaceAudience.Private
public class XAttrStorage {
/**
* Reads the extended attribute of an inode by name with prefix.
* <p>
*
* @param inode INode to read
* @param snapshotId the snapshotId of the requested path
* @param prefixedName xAttr name with prefix
* @return the xAttr
*/
public static XAttr readINodeXAttrByPrefixedName(INode inode, int snapshotId,
String prefixedName) {
XAttrFeature f = inode.getXAttrFeature(snapshotId);
return f == null ? null : f.getXAttr(prefixedName);
}
/**
* Reads the existing extended attributes of an inode.
* <p>
* Must be called while holding the FSDirectory read lock.
*
* @param inodeAttr INodeAttributes to read.
* @return {@code XAttr} list.
*/
public static List<XAttr> readINodeXAttrs(INodeAttributes inodeAttr) {
XAttrFeature f = inodeAttr.getXAttrFeature();
return f == null ? new ArrayList<XAttr>(0) : f.getXAttrs();
}
/**
* Update xattrs of inode.
* <p>
* Must be called while holding the FSDirectory write lock.
*
* @param inode INode to update
* @param xAttrs to update xAttrs.
* @param snapshotId id of the latest snapshot of the inode
*/
public static void updateINodeXAttrs(INode inode,
List<XAttr> xAttrs, int snapshotId) throws QuotaExceededException {
if (inode.getXAttrFeature() != null) {
inode.removeXAttrFeature(snapshotId);
}
if (xAttrs == null || xAttrs.isEmpty()) {
return;
}
inode.addXAttrFeature(new XAttrFeature(xAttrs), snapshotId);
}
}
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