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comparison src/java/org/apache/cassandra/db/ReadResponse.java @ 0:d485154379c8 default tip

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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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1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 package org.apache.cassandra.db;
20
21 import java.io.ByteArrayOutputStream;
22 import java.io.DataInputStream;
23 import java.io.DataOutputStream;
24 import java.io.IOException;
25
26 import org.apache.cassandra.concurrent.StageManager;
27 import org.apache.cassandra.io.ICompactSerializer;
28 import org.apache.cassandra.net.Message;
29 import org.apache.cassandra.net.MessagingService;
30 import org.apache.cassandra.utils.FBUtilities;
31
32 import org.apache.commons.lang.ArrayUtils;
33
34
35 /*
36 * The read response message is sent by the server when reading data
37 * this encapsulates the tablename and the row that has been read.
38 * The table name is needed so that we can use it to create repairs.
39 */
40 public class ReadResponse
41 {
42 private static ICompactSerializer<ReadResponse> serializer_;
43
44 static
45 {
46 serializer_ = new ReadResponseSerializer();
47 }
48
49 public static ICompactSerializer<ReadResponse> serializer()
50 {
51 return serializer_;
52 }
53
54 private Row row_;
55 private byte[] digest_ = ArrayUtils.EMPTY_BYTE_ARRAY;
56 private boolean isDigestQuery_ = false;
57
58 public ReadResponse(byte[] digest )
59 {
60 assert digest != null;
61 digest_= digest;
62 }
63
64 public ReadResponse(Row row)
65 {
66 row_ = row;
67 }
68
69 public Row row()
70 {
71 return row_;
72 }
73
74 public byte[] digest()
75 {
76 return digest_;
77 }
78
79 public boolean isDigestQuery()
80 {
81 return isDigestQuery_;
82 }
83
84 public void setIsDigestQuery(boolean isDigestQuery)
85 {
86 isDigestQuery_ = isDigestQuery;
87 }
88 }
89
90 class ReadResponseSerializer implements ICompactSerializer<ReadResponse>
91 {
92 public void serialize(ReadResponse rm, DataOutputStream dos) throws IOException
93 {
94 dos.writeInt(rm.digest().length);
95 dos.write(rm.digest());
96 dos.writeBoolean(rm.isDigestQuery());
97
98 if( !rm.isDigestQuery() && rm.row() != null )
99 {
100 Row.serializer().serialize(rm.row(), dos);
101 }
102 }
103
104 public ReadResponse deserialize(DataInputStream dis) throws IOException
105 {
106 int digestSize = dis.readInt();
107 byte[] digest = new byte[digestSize];
108 dis.read(digest, 0 , digestSize);
109 boolean isDigest = dis.readBoolean();
110
111 Row row = null;
112 if (!isDigest)
113 {
114 row = Row.serializer().deserialize(dis);
115 }
116
117 ReadResponse rmsg = isDigest ? new ReadResponse(digest) : new ReadResponse(row);
118 rmsg.setIsDigestQuery(isDigest);
119 return rmsg;
120 }
121 }