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.fs;
019
020import java.io.DataInput;
021import java.io.DataOutput;
022import java.io.IOException;
023
024import org.apache.hadoop.classification.InterfaceAudience;
025import org.apache.hadoop.classification.InterfaceStability;
026import org.apache.hadoop.io.Writable;
027import org.apache.hadoop.io.WritableFactories;
028import org.apache.hadoop.io.WritableFactory;
029import org.apache.hadoop.io.WritableUtils;
030import org.apache.hadoop.util.DataChecksum;
031
032/****************************************************
033 * Provides server default configuration values to clients.
034 * 
035 ****************************************************/
036@InterfaceAudience.Public
037@InterfaceStability.Evolving
038public class FsServerDefaults implements Writable {
039
040  static { // register a ctor
041    WritableFactories.setFactory(FsServerDefaults.class, new WritableFactory() {
042      @Override
043      public Writable newInstance() {
044        return new FsServerDefaults();
045      }
046    });
047  }
048
049  private long blockSize;
050  private int bytesPerChecksum;
051  private int writePacketSize;
052  private short replication;
053  private int fileBufferSize;
054  private boolean encryptDataTransfer;
055  private long trashInterval;
056  private DataChecksum.Type checksumType;
057  private String keyProviderUri;
058
059  public FsServerDefaults() {
060  }
061
062  public FsServerDefaults(long blockSize, int bytesPerChecksum,
063      int writePacketSize, short replication, int fileBufferSize,
064      boolean encryptDataTransfer, long trashInterval,
065      DataChecksum.Type checksumType,
066      String keyProviderUri) {
067    this.blockSize = blockSize;
068    this.bytesPerChecksum = bytesPerChecksum;
069    this.writePacketSize = writePacketSize;
070    this.replication = replication;
071    this.fileBufferSize = fileBufferSize;
072    this.encryptDataTransfer = encryptDataTransfer;
073    this.trashInterval = trashInterval;
074    this.checksumType = checksumType;
075    this.keyProviderUri = keyProviderUri;
076  }
077
078  public long getBlockSize() {
079    return blockSize;
080  }
081
082  public int getBytesPerChecksum() {
083    return bytesPerChecksum;
084  }
085
086  public int getWritePacketSize() {
087    return writePacketSize;
088  }
089
090  public short getReplication() {
091    return replication;
092  }
093
094  public int getFileBufferSize() {
095    return fileBufferSize;
096  }
097  
098  public boolean getEncryptDataTransfer() {
099    return encryptDataTransfer;
100  }
101
102  public long getTrashInterval() {
103    return trashInterval;
104  }
105
106  public DataChecksum.Type getChecksumType() {
107    return checksumType;
108  }
109
110  /* null means old style namenode.
111   * "" (empty string) means namenode is upgraded but EZ is not supported.
112   * some string means that value is the key provider.
113   */
114  public String getKeyProviderUri() {
115    return keyProviderUri;
116  }
117
118  // /////////////////////////////////////////
119  // Writable
120  // /////////////////////////////////////////
121  @Override
122  @InterfaceAudience.Private
123  public void write(DataOutput out) throws IOException {
124    out.writeLong(blockSize);
125    out.writeInt(bytesPerChecksum);
126    out.writeInt(writePacketSize);
127    out.writeShort(replication);
128    out.writeInt(fileBufferSize);
129    WritableUtils.writeEnum(out, checksumType);
130  }
131
132  @Override
133  @InterfaceAudience.Private
134  public void readFields(DataInput in) throws IOException {
135    blockSize = in.readLong();
136    bytesPerChecksum = in.readInt();
137    writePacketSize = in.readInt();
138    replication = in.readShort();
139    fileBufferSize = in.readInt();
140    checksumType = WritableUtils.readEnum(in, DataChecksum.Type.class);
141  }
142}