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 */
018package org.apache.hadoop.hdfs.server.datanode;
019
020import java.io.File;
021
022import org.apache.hadoop.hdfs.protocol.Block;
023import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
024import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi;
025
026/** This class represents replicas being written. 
027 * Those are the replicas that
028 * are created in a pipeline initiated by a dfs client.
029 */
030public class ReplicaBeingWritten extends ReplicaInPipeline {
031  /**
032   * Constructor for a zero length replica
033   * @param blockId block id
034   * @param genStamp replica generation stamp
035   * @param vol volume where replica is located
036   * @param dir directory path where block and meta files are located
037   * @param bytesToReserve disk space to reserve for this replica, based on
038   *                       the estimated maximum block length.
039   */
040  public ReplicaBeingWritten(long blockId, long genStamp, 
041        FsVolumeSpi vol, File dir, long bytesToReserve) {
042    super(blockId, genStamp, vol, dir, bytesToReserve);
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   * @param writer a thread that is writing to this replica
051   */
052  public ReplicaBeingWritten(Block block, 
053      FsVolumeSpi vol, File dir, Thread writer) {
054    super( block, vol, dir, writer);
055  }
056
057  /**
058   * Constructor
059   * @param blockId block id
060   * @param len replica length
061   * @param genStamp replica generation stamp
062   * @param vol volume where replica is located
063   * @param dir directory path where block and meta files are located
064   * @param writer a thread that is writing to this replica
065   * @param bytesToReserve disk space to reserve for this replica, based on
066   *                       the estimated maximum block length.
067   */
068  public ReplicaBeingWritten(long blockId, long len, long genStamp,
069      FsVolumeSpi vol, File dir, Thread writer, long bytesToReserve) {
070    super(blockId, len, genStamp, vol, dir, writer, bytesToReserve);
071  }
072
073  /**
074   * Copy constructor.
075   * @param from where to copy from
076   */
077  public ReplicaBeingWritten(ReplicaBeingWritten from) {
078    super(from);
079  }
080
081  @Override
082  public long getVisibleLength() {
083    return getBytesAcked();       // all acked bytes are visible
084  }
085
086  @Override   //ReplicaInfo
087  public ReplicaState getState() {
088    return ReplicaState.RBW;
089  }
090  
091  @Override  // Object
092  public boolean equals(Object o) {
093    return super.equals(o);
094  }
095  
096  @Override  // Object
097  public int hashCode() {
098    return super.hashCode();
099  }
100}