hadoop XAttrFeature 源码

  • 2022-10-20
  • 浏览 (30)

haddop XAttrFeature 代码

文件路径:/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/XAttrFeature.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.Arrays;
import java.util.List;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.XAttr;
import org.apache.hadoop.hdfs.XAttrHelper;

import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;

/**
 * Feature for extended attributes.
 */
@InterfaceAudience.Private
public class XAttrFeature implements INode.Feature {
  static final int PACK_THRESHOLD = 1024;

  /** The packed bytes for small size XAttrs. */
  private byte[] attrs;

  /**
   * List to store large size XAttrs.
   * Typically XAttr value size is small, so this
   * list is null usually.
   */
  private ImmutableList<XAttr> xAttrs;

  public XAttrFeature(List<XAttr> xAttrs) {
    if (xAttrs != null && !xAttrs.isEmpty()) {
      List<XAttr> toPack = new ArrayList<XAttr>();
      ImmutableList.Builder<XAttr> b = null;
      for (XAttr attr : xAttrs) {
        if (attr.getValue() == null ||
            attr.getValue().length <= PACK_THRESHOLD) {
          toPack.add(attr);
        } else {
          if (b == null) {
            b = ImmutableList.builder();
          }
          b.add(attr);
        }
      }
      this.attrs = XAttrFormat.toBytes(toPack);
      if (b != null) {
        this.xAttrs = b.build();
      }
    }
  }

  /**
   * Get the XAttrs.
   * @return the XAttrs
   */
  public List<XAttr> getXAttrs() {
    if (xAttrs == null) {
      return XAttrFormat.toXAttrs(attrs);
    } else {
      if (attrs == null) {
        return xAttrs;
      } else {
        List<XAttr> result = new ArrayList<>();
        result.addAll(XAttrFormat.toXAttrs(attrs));
        result.addAll(xAttrs);
        return result;
      }
    }
  }

  @Override
  public boolean equals(Object o) {
    if (o == null) {
      return false;
    }
    if (getClass() != o.getClass()) {
      return false;
    }
    return getXAttrs().equals(((XAttrFeature) o).getXAttrs());
  }

  @Override
  public int hashCode() {
    return Arrays.hashCode(getXAttrs().toArray());
  }

  /**
   * Get XAttr by name with prefix.
   * @param prefixedName xAttr name with prefix
   * @return the XAttr
   */
  public XAttr getXAttr(String prefixedName) {
    XAttr attr = XAttrFormat.getXAttr(attrs, prefixedName);
    if (attr == null && xAttrs != null) {
      XAttr toFind = XAttrHelper.buildXAttr(prefixedName);
      for (XAttr a : xAttrs) {
        if (a.equalsIgnoreValue(toFind)) {
          attr = a;
          break;
        }
      }
    }
    return attr;
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AclEntryStatusFormat 源码

hadoop AclFeature 源码

hadoop AclStorage 源码

hadoop AclTransformation 源码

hadoop AuditLogger 源码

hadoop BackupImage 源码

hadoop BackupJournalManager 源码

hadoop BackupNode 源码

hadoop BackupState 源码

hadoop CacheManager 源码

0  赞