bharat saraswal | f7364db | 2015-08-11 13:39:31 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.pcepio.protocol.ver1; |
| 18 | |
| 19 | import org.jboss.netty.buffer.ChannelBuffer; |
| 20 | import org.onosproject.pcepio.exceptions.PcepParseException; |
| 21 | import org.onosproject.pcepio.protocol.PcepKeepaliveMsg; |
| 22 | import org.onosproject.pcepio.protocol.PcepMessageReader; |
| 23 | import org.onosproject.pcepio.protocol.PcepMessageWriter; |
| 24 | import org.onosproject.pcepio.protocol.PcepType; |
| 25 | import org.onosproject.pcepio.protocol.PcepVersion; |
| 26 | import org.slf4j.Logger; |
| 27 | import org.slf4j.LoggerFactory; |
| 28 | |
| 29 | class PcepKeepaliveMsgVer1 implements PcepKeepaliveMsg { |
| 30 | |
| 31 | /* |
| 32 | <Keepalive Message>::= <Common Header> |
| 33 | |
| 34 | 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 |
| 35 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 36 | | Ver | Flags | Message-Type | Message-Length | |
| 37 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 38 | */ |
| 39 | |
| 40 | protected static final Logger log = LoggerFactory.getLogger(PcepKeepaliveMsgVer1.class); |
| 41 | // Pcep version: 1 |
| 42 | public static final byte PACKET_VERSION = 1; |
| 43 | public static final int PACKET_MINIMUM_LENGTH = 4; |
| 44 | public static final PcepType MSG_TYPE = PcepType.KEEP_ALIVE; |
| 45 | |
| 46 | public static final PcepKeepaliveMsgVer1.Reader READER = new Reader(); |
| 47 | |
| 48 | static class Reader implements PcepMessageReader<PcepKeepaliveMsg> { |
| 49 | |
| 50 | @Override |
| 51 | public PcepKeepaliveMsg readFrom(ChannelBuffer cb) throws PcepParseException { |
| 52 | |
| 53 | if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) { |
| 54 | throw new PcepParseException("Packet size is less than the minimum required length."); |
| 55 | } |
| 56 | // fixed value property version == 1 |
| 57 | byte version = cb.readByte(); |
| 58 | version = (byte) (version >> PcepMessageVer1.SHIFT_FLAG); |
| 59 | if (version != PACKET_VERSION) { |
| 60 | throw new PcepParseException("Wrong version: Expected=PcepVersion.KEEP_ALIVE_1(2), got=" + version); |
| 61 | } |
| 62 | // fixed value property type == 2 |
| 63 | byte type = cb.readByte(); |
| 64 | if (type != MSG_TYPE.getType()) { |
| 65 | throw new PcepParseException("Wrong type: Expected=PcepType.KEEP_ALIVE_1(2), got=" + type); |
| 66 | } |
| 67 | short length = cb.readShort(); |
| 68 | if (length < PACKET_MINIMUM_LENGTH) { |
| 69 | throw new PcepParseException("Wrong length: Expected to be >= " + PACKET_MINIMUM_LENGTH + ", was: " |
| 70 | + length); |
| 71 | } |
| 72 | return new PcepKeepaliveMsgVer1(); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Default constructor. |
| 78 | */ |
| 79 | PcepKeepaliveMsgVer1() { |
| 80 | } |
| 81 | |
| 82 | static class Builder implements PcepKeepaliveMsg.Builder { |
| 83 | @Override |
| 84 | public PcepVersion getVersion() { |
| 85 | return PcepVersion.PCEP_1; |
| 86 | } |
| 87 | |
| 88 | @Override |
| 89 | public PcepType getType() { |
| 90 | return PcepType.KEEP_ALIVE; |
| 91 | } |
| 92 | |
| 93 | @Override |
| 94 | public PcepKeepaliveMsg build() { |
| 95 | return new PcepKeepaliveMsgVer1(); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | @Override |
| 100 | public void writeTo(ChannelBuffer cb) { |
| 101 | WRITER.write(cb, this); |
| 102 | } |
| 103 | |
| 104 | static final Writer WRITER = new Writer(); |
| 105 | |
| 106 | static class Writer implements PcepMessageWriter<PcepKeepaliveMsgVer1> { |
| 107 | |
| 108 | @Override |
| 109 | public void write(ChannelBuffer cb, PcepKeepaliveMsgVer1 message) { |
| 110 | int startIndex = cb.writerIndex(); |
| 111 | // first 3 bits set to version |
| 112 | cb.writeByte((byte) (PACKET_VERSION << PcepMessageVer1.SHIFT_FLAG)); |
| 113 | // message type |
| 114 | cb.writeByte(MSG_TYPE.getType()); |
| 115 | // length is length of variable message, will be updated at the end |
| 116 | // Store the position of message |
| 117 | // length in buffer |
| 118 | int msgLenIndex = cb.writerIndex(); |
| 119 | cb.writeShort((short) 0); |
| 120 | // update message length field |
| 121 | int length = cb.writerIndex() - startIndex; |
| 122 | cb.setShort(msgLenIndex, (short) length); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | @Override |
| 127 | public PcepVersion getVersion() { |
| 128 | return PcepVersion.PCEP_1; |
| 129 | } |
| 130 | |
| 131 | @Override |
| 132 | public PcepType getType() { |
| 133 | return MSG_TYPE; |
| 134 | } |
| 135 | |
| 136 | @Override |
| 137 | public void print() { |
| 138 | log.debug("KEEPALIVE MESSAGE"); |
| 139 | } |
| 140 | } |