blob: 8b6e93820ee693f5f88e7abfcfff7052b2f4c4c1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onosproject.pcepio.protocol.ver1;
import org.jboss.netty.buffer.ChannelBuffer;
import org.onosproject.pcepio.exceptions.PcepParseException;
import org.onosproject.pcepio.protocol.PcepKeepaliveMsg;
import org.onosproject.pcepio.protocol.PcepMessageReader;
import org.onosproject.pcepio.protocol.PcepMessageWriter;
import org.onosproject.pcepio.protocol.PcepType;
import org.onosproject.pcepio.protocol.PcepVersion;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.MoreObjects;
/**
* Provides PCEP keep alive message.
*/
class PcepKeepaliveMsgVer1 implements PcepKeepaliveMsg {
/*
<Keepalive Message>::= <Common Header>
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ver | Flags | Message-Type | Message-Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
protected static final Logger log = LoggerFactory.getLogger(PcepKeepaliveMsgVer1.class);
// Pcep version: 1
public static final byte PACKET_VERSION = 1;
public static final int PACKET_MINIMUM_LENGTH = 4;
public static final PcepType MSG_TYPE = PcepType.KEEP_ALIVE;
public static final PcepKeepaliveMsgVer1.Reader READER = new Reader();
/**
* Reader class for reading PCEP keepalive message from channel buffer.
*/
static class Reader implements PcepMessageReader<PcepKeepaliveMsg> {
@Override
public PcepKeepaliveMsg readFrom(ChannelBuffer cb) throws PcepParseException {
if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) {
throw new PcepParseException("Packet size is less than the minimum required length.");
}
// fixed value property version == 1
byte version = cb.readByte();
version = (byte) (version >> PcepMessageVer1.SHIFT_FLAG);
if (version != PACKET_VERSION) {
throw new PcepParseException("Wrong version: Expected=PcepVersion.KEEP_ALIVE_1(2), got=" + version);
}
// fixed value property type == 2
byte type = cb.readByte();
if (type != MSG_TYPE.getType()) {
throw new PcepParseException("Wrong type: Expected=PcepType.KEEP_ALIVE_1(2), got=" + type);
}
short length = cb.readShort();
if (length < PACKET_MINIMUM_LENGTH) {
throw new PcepParseException("Wrong length: Expected to be >= " + PACKET_MINIMUM_LENGTH + ", was: "
+ length);
}
return new PcepKeepaliveMsgVer1();
}
}
/**
* Default constructor.
*/
PcepKeepaliveMsgVer1() {
}
/**
* Builder class for PCEP keepalive message.
*/
static class Builder implements PcepKeepaliveMsg.Builder {
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public PcepType getType() {
return PcepType.KEEP_ALIVE;
}
@Override
public PcepKeepaliveMsg build() {
return new PcepKeepaliveMsgVer1();
}
}
@Override
public void writeTo(ChannelBuffer cb) {
WRITER.write(cb, this);
}
static final Writer WRITER = new Writer();
/**
* Writer class for writing the PCEP keepalive message to channel buffer.
*/
static class Writer implements PcepMessageWriter<PcepKeepaliveMsgVer1> {
@Override
public void write(ChannelBuffer cb, PcepKeepaliveMsgVer1 message) {
int startIndex = cb.writerIndex();
// first 3 bits set to version
cb.writeByte((byte) (PACKET_VERSION << PcepMessageVer1.SHIFT_FLAG));
// message type
cb.writeByte(MSG_TYPE.getType());
// length is length of variable message, will be updated at the end
// Store the position of message
// length in buffer
int msgLenIndex = cb.writerIndex();
cb.writeShort((short) 0);
// update message length field
int length = cb.writerIndex() - startIndex;
cb.setShort(msgLenIndex, (short) length);
}
}
@Override
public PcepVersion getVersion() {
return PcepVersion.PCEP_1;
}
@Override
public PcepType getType() {
return MSG_TYPE;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass()).toString();
}
}
|
