001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.hadoop.hdfs.server.datanode;
019    
020    import java.io.File;
021    
022    import org.apache.hadoop.hdfs.protocol.Block;
023    import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
024    import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
025    
026    /**
027     * This class describes a replica that has been finalized.
028     */
029    public class FinalizedReplica extends ReplicaInfo {
030      private boolean unlinked;      // copy-on-write done for block
031    
032      /**
033       * Constructor
034       * @param blockId block id
035       * @param len replica length
036       * @param genStamp replica generation stamp
037       * @param vol volume where replica is located
038       * @param dir directory path where block and meta files are located
039       */
040      public FinalizedReplica(long blockId, long len, long genStamp,
041          FsVolumeSpi vol, File dir) {
042        super(blockId, len, genStamp, vol, dir);
043      }
044      
045      /**
046       * Constructor
047       * @param block a block
048       * @param vol volume where replica is located
049       * @param dir directory path where block and meta files are located
050       */
051      public FinalizedReplica(Block block, FsVolumeSpi vol, File dir) {
052        super(block, vol, dir);
053      }
054    
055      /**
056       * Copy constructor.
057       * @param from
058       */
059      public FinalizedReplica(FinalizedReplica from) {
060        super(from);
061        this.unlinked = from.isUnlinked();
062      }
063    
064      @Override  // ReplicaInfo
065      public ReplicaState getState() {
066        return ReplicaState.FINALIZED;
067      }
068      
069      @Override // ReplicaInfo
070      public boolean isUnlinked() {
071        return unlinked;
072      }
073    
074      @Override  // ReplicaInfo
075      public void setUnlinked() {
076        unlinked = true;
077      }
078      
079      @Override
080      public long getVisibleLength() {
081        return getNumBytes();       // all bytes are visible
082      }
083    
084      @Override
085      public long getBytesOnDisk() {
086        return getNumBytes();
087      }
088    
089      @Override  // Object
090      public boolean equals(Object o) {
091        return super.equals(o);
092      }
093      
094      @Override  // Object
095      public int hashCode() {
096        return super.hashCode();
097      }
098      
099      @Override
100      public String toString() {
101        return super.toString()
102            + "\n  unlinked          =" + unlinked;
103      }
104    }