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   */
038  public ReplicaBeingWritten(long blockId, long genStamp, 
039        FsVolumeSpi vol, File dir) {
040    super( blockId, genStamp, vol, dir);
041  }
042  
043  /**
044   * Constructor
045   * @param block a block
046   * @param vol volume where replica is located
047   * @param dir directory path where block and meta files are located
048   * @param writer a thread that is writing to this replica
049   */
050  public ReplicaBeingWritten(Block block, 
051      FsVolumeSpi vol, File dir, Thread writer) {
052    super( block, vol, dir, writer);
053  }
054
055  /**
056   * Constructor
057   * @param blockId block id
058   * @param len replica length
059   * @param genStamp replica generation stamp
060   * @param vol volume where replica is located
061   * @param dir directory path where block and meta files are located
062   * @param writer a thread that is writing to this replica
063   */
064  public ReplicaBeingWritten(long blockId, long len, long genStamp,
065      FsVolumeSpi vol, File dir, Thread writer ) {
066    super( blockId, len, genStamp, vol, dir, writer);
067  }
068
069  /**
070   * Copy constructor.
071   * @param from
072   */
073  public ReplicaBeingWritten(ReplicaBeingWritten from) {
074    super(from);
075  }
076
077  @Override
078  public long getVisibleLength() {
079    return getBytesAcked();       // all acked bytes are visible
080  }
081
082  @Override   //ReplicaInfo
083  public ReplicaState getState() {
084    return ReplicaState.RBW;
085  }
086  
087  @Override  // Object
088  public boolean equals(Object o) {
089    return super.equals(o);
090  }
091  
092  @Override  // Object
093  public int hashCode() {
094    return super.hashCode();
095  }
096}