View Javadoc

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,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.directory.mitosis.service.protocol.codec;
21  
22  
23  import java.nio.charset.CharacterCodingException;
24  import java.nio.charset.Charset;
25  import java.nio.charset.CharsetDecoder;
26  
27  import org.apache.directory.mitosis.common.CSNVector;
28  import org.apache.directory.mitosis.common.DefaultCSN;
29  import org.apache.directory.mitosis.service.protocol.Constants;
30  import org.apache.directory.mitosis.service.protocol.message.BaseMessage;
31  import org.apache.directory.mitosis.service.protocol.message.BeginLogEntriesAckMessage;
32  import org.apache.directory.server.schema.registries.Registries;
33  import org.apache.mina.common.ByteBuffer;
34  import org.apache.mina.common.IoSession;
35  import org.apache.mina.filter.codec.ProtocolDecoderException;
36  import org.apache.mina.filter.codec.ProtocolDecoderOutput;
37  
38  
39  public class BeginLogEntriesAckMessageDecoder extends ResponseMessageDecoder
40  {
41      private final CharsetDecoder utf8decoder;
42  
43  
44      public BeginLogEntriesAckMessageDecoder()
45      {
46          super( Constants.GET_UPDATE_VECTOR_ACK, 0, 3072 );
47          utf8decoder = Charset.forName( "UTF-8" ).newDecoder();
48      }
49  
50  
51      protected BaseMessage decodeBody( Registries registries, int sequence, int bodyLength, int responseCode, ByteBuffer in ) throws Exception
52      {
53          if ( responseCode != Constants.OK )
54          {
55              return new BeginLogEntriesAckMessage( sequence, responseCode, null, null );
56          }
57  
58          CSNVector purgeVector = new CSNVector();
59          CSNVector updateVector = new CSNVector();
60          BeginLogEntriesAckMessage m = new BeginLogEntriesAckMessage( sequence, responseCode, purgeVector, updateVector );
61          readCSNVector( in, purgeVector );
62          readCSNVector( in, updateVector );
63  
64          return m;
65      }
66  
67  
68      private void readCSNVector( ByteBuffer in, CSNVector updateVector ) throws Exception
69      {
70          int nReplicas = in.getInt();
71          
72          if ( nReplicas < 0 )
73          {
74              throw new ProtocolDecoderException( "Wrong nReplicas: " + nReplicas );
75          }
76  
77          for ( ; nReplicas > 0; nReplicas-- )
78          {
79              String replicaId;
80              
81              try
82              {
83                  replicaId = in.getString( utf8decoder );
84              }
85              catch ( CharacterCodingException e )
86              {
87                  throw new ProtocolDecoderException( "Invalid replicaId", e );
88              }
89  
90              updateVector.setCSN( new DefaultCSN( in.getLong(), replicaId, in.getInt() ) );
91          }
92      }
93  
94  
95      public void finishDecode( IoSession session, ProtocolDecoderOutput out ) throws Exception
96      {
97      }
98  }