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apache-cassandra-0.6.0-rc1-src
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Fri, 02 Apr 2010 13:36:02 +0900
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d485154379c8 apache-cassandra-0.6.0-rc1-src
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1 /**
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2 * Licensed to the Apache Software Foundation (ASF) under one
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3 * or more contributor license agreements. See the NOTICE file
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4 * distributed with this work for additional information
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5 * regarding copyright ownership. The ASF licenses this file
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6 * to you under the Apache License, Version 2.0 (the
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7 * "License"); you may not use this file except in compliance
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8 * with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18
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19 package org.apache.cassandra.db;
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20
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21 import java.io.ByteArrayOutputStream;
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22 import java.io.DataInputStream;
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23 import java.io.DataOutputStream;
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24 import java.io.IOException;
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25
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26 import org.apache.cassandra.concurrent.StageManager;
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27 import org.apache.cassandra.io.ICompactSerializer;
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28 import org.apache.cassandra.net.Message;
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29 import org.apache.cassandra.net.MessagingService;
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30 import org.apache.cassandra.utils.FBUtilities;
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31
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32 import org.apache.commons.lang.ArrayUtils;
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35 /*
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36 * The read response message is sent by the server when reading data
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37 * this encapsulates the tablename and the row that has been read.
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38 * The table name is needed so that we can use it to create repairs.
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39 */
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40 public class ReadResponse
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41 {
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42 private static ICompactSerializer<ReadResponse> serializer_;
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43
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44 static
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45 {
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46 serializer_ = new ReadResponseSerializer();
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47 }
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48
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49 public static ICompactSerializer<ReadResponse> serializer()
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50 {
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51 return serializer_;
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52 }
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53
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54 private Row row_;
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55 private byte[] digest_ = ArrayUtils.EMPTY_BYTE_ARRAY;
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56 private boolean isDigestQuery_ = false;
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57
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58 public ReadResponse(byte[] digest )
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59 {
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60 assert digest != null;
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61 digest_= digest;
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62 }
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63
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64 public ReadResponse(Row row)
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65 {
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66 row_ = row;
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67 }
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68
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69 public Row row()
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70 {
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71 return row_;
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72 }
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73
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74 public byte[] digest()
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75 {
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76 return digest_;
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77 }
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78
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79 public boolean isDigestQuery()
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80 {
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81 return isDigestQuery_;
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82 }
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83
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84 public void setIsDigestQuery(boolean isDigestQuery)
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85 {
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86 isDigestQuery_ = isDigestQuery;
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87 }
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88 }
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89
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90 class ReadResponseSerializer implements ICompactSerializer<ReadResponse>
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91 {
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92 public void serialize(ReadResponse rm, DataOutputStream dos) throws IOException
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93 {
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94 dos.writeInt(rm.digest().length);
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95 dos.write(rm.digest());
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96 dos.writeBoolean(rm.isDigestQuery());
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97
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98 if( !rm.isDigestQuery() && rm.row() != null )
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99 {
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100 Row.serializer().serialize(rm.row(), dos);
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101 }
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102 }
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103
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104 public ReadResponse deserialize(DataInputStream dis) throws IOException
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105 {
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106 int digestSize = dis.readInt();
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107 byte[] digest = new byte[digestSize];
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108 dis.read(digest, 0 , digestSize);
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109 boolean isDigest = dis.readBoolean();
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110
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111 Row row = null;
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112 if (!isDigest)
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113 {
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114 row = Row.serializer().deserialize(dis);
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115 }
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116
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117 ReadResponse rmsg = isDigest ? new ReadResponse(digest) : new ReadResponse(row);
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118 rmsg.setIsDigestQuery(isDigest);
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119 return rmsg;
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120 }
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121 }