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      public Writable newInstance() {
043        return new FsServerDefaults();
044      }
045    });
046  }
047
048  private long blockSize;
049  private int bytesPerChecksum;
050  private int writePacketSize;
051  private short replication;
052  private int fileBufferSize;
053  private DataChecksum.Type checksumType;
054
055  public FsServerDefaults() {
056  }
057
058  public FsServerDefaults(long blockSize, int bytesPerChecksum,
059      int writePacketSize, short replication, int fileBufferSize,
060      DataChecksum.Type checksumType) {
061    this.blockSize = blockSize;
062    this.bytesPerChecksum = bytesPerChecksum;
063    this.writePacketSize = writePacketSize;
064    this.replication = replication;
065    this.fileBufferSize = fileBufferSize;
066    this.checksumType = checksumType;
067  }
068
069  public long getBlockSize() {
070    return blockSize;
071  }
072
073  public int getBytesPerChecksum() {
074    return bytesPerChecksum;
075  }
076
077  public int getWritePacketSize() {
078    return writePacketSize;
079  }
080
081  public short getReplication() {
082    return replication;
083  }
084
085  public int getFileBufferSize() {
086    return fileBufferSize;
087  }
088
089  public DataChecksum.Type getChecksumType() {
090    return checksumType;
091  }
092
093  // /////////////////////////////////////////
094  // Writable
095  // /////////////////////////////////////////
096  @InterfaceAudience.Private
097  public void write(DataOutput out) throws IOException {
098    out.writeLong(blockSize);
099    out.writeInt(bytesPerChecksum);
100    out.writeInt(writePacketSize);
101    out.writeShort(replication);
102    out.writeInt(fileBufferSize);
103    WritableUtils.writeEnum(out, checksumType);
104  }
105
106  @InterfaceAudience.Private
107  public void readFields(DataInput in) throws IOException {
108    blockSize = in.readLong();
109    bytesPerChecksum = in.readInt();
110    writePacketSize = in.readInt();
111    replication = in.readShort();
112    fileBufferSize = in.readInt();
113    checksumType = WritableUtils.readEnum(in, DataChecksum.Type.class);
114  }
115}