hadoop INodeSymlink 源码

haddop INodeSymlink 代码

文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeSymlink.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.io.PrintWriter;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.permission.PermissionStatus;
import org.apache.hadoop.hdfs.DFSUtil;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
import org.apache.hadoop.hdfs.server.namenode.visitor.NamespaceVisitor;

/**
 * An {@link INode} representing a symbolic link.
 */
@InterfaceAudience.Private
public class INodeSymlink extends INodeWithAdditionalFields {
  private final byte[] symlink; // The target URI

  INodeSymlink(long id, byte[] name, PermissionStatus permissions,
      long mtime, long atime, String symlink) {
    super(id, name, permissions, mtime, atime);
    this.symlink = DFSUtil.string2Bytes(symlink);
  }
  
  INodeSymlink(INodeSymlink that) {
    super(that);
    this.symlink = that.symlink;
  }

  @Override
  void recordModification(int latestSnapshotId) {
    if (isInLatestSnapshot(latestSnapshotId)) {
      INodeDirectory parent = getParent();
      parent.saveChild2Snapshot(this, latestSnapshotId, new INodeSymlink(this));
    }
  }

  /** @return true unconditionally. */
  @Override
  public boolean isSymlink() {
    return true;
  }

  /** @return this object. */
  @Override
  public INodeSymlink asSymlink() {
    return this;
  }

  public String getSymlinkString() {
    return DFSUtil.bytes2String(symlink);
  }

  public byte[] getSymlink() {
    return symlink;
  }
  
  @Override
  public void cleanSubtree(ReclaimContext reclaimContext, final int snapshotId,
      int priorSnapshotId) {
    if (snapshotId == Snapshot.CURRENT_STATE_ID
        && priorSnapshotId == Snapshot.NO_SNAPSHOT_ID) {
      destroyAndCollectBlocks(reclaimContext);
    }
  }
  
  @Override
  public void destroyAndCollectBlocks(ReclaimContext reclaimContext) {
    reclaimContext.removedINodes.add(this);
    reclaimContext.quotaDelta().add(
        new QuotaCounts.Builder().nameSpace(1).build());
  }

  @Override
  public QuotaCounts computeQuotaUsage(BlockStoragePolicySuite bsps,
      byte blockStoragePolicyId, boolean useCache, int lastSnapshotId) {
    return new QuotaCounts.Builder().nameSpace(1).build();
  }

  @Override
  public ContentSummaryComputationContext computeContentSummary(int snapshotId,
      final ContentSummaryComputationContext summary) {
    summary.getCounts().addContent(Content.SYMLINK, 1);
    return summary;
  }

  @Override
  public void dumpTreeRecursively(PrintWriter out, StringBuilder prefix,
      final int snapshot) {
    super.dumpTreeRecursively(out, prefix, snapshot);
    out.print(" ~> ");
    out.println(getSymlinkString());
  }

  @Override
  public void accept(NamespaceVisitor visitor, int snapshot) {
    visitor.visitSymlink(this, snapshot);
  }

  @Override
  public void removeAclFeature() {
    throw new UnsupportedOperationException("ACLs are not supported on symlinks");
  }

  @Override
  public void addAclFeature(AclFeature f) {
    throw new UnsupportedOperationException("ACLs are not supported on symlinks");
  }

  @Override
  final XAttrFeature getXAttrFeature(int snapshotId) {
    throw new UnsupportedOperationException("XAttrs are not supported on symlinks");
  }
  
  @Override
  public void removeXAttrFeature() {
    throw new UnsupportedOperationException("XAttrs are not supported on symlinks");
  }
  
  @Override
  public void addXAttrFeature(XAttrFeature f) {
    throw new UnsupportedOperationException("XAttrs are not supported on symlinks");
  }

  @Override
  public byte getStoragePolicyID() {
    throw new UnsupportedOperationException(
        "Storage policy are not supported on symlinks");
  }

  @Override
  public byte getLocalStoragePolicyID() {
    throw new UnsupportedOperationException(
        "Storage policy are not supported on symlinks");
  }
}

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