| /* |
| * Copyright 2015-present 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(); |
| } |
| } |