| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * 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 java.util.LinkedList; |
| import java.util.ListIterator; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.onosproject.pcepio.exceptions.PcepParseException; |
| import org.onosproject.pcepio.protocol.PcepLabelUpdate; |
| import org.onosproject.pcepio.protocol.PcepLabelUpdateMsg; |
| 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 lable update message. |
| */ |
| class PcepLabelUpdateMsgVer1 implements PcepLabelUpdateMsg { |
| |
| // Pcep version: 1 |
| |
| /* |
| The format of the PCLabelUpd message: |
| |
| <PCLabelUpd Message> ::= <Common Header> |
| <pce-label-update-list> |
| Where: |
| |
| <pce-label-update-list> ::= <pce-label-update> |
| [<pce-label-update-list>] |
| <pce-label-update> ::= (<pce-label-download>|<pce-label-map>) |
| |
| Where: |
| <pce-label-download> ::= <SRP> |
| <LSP> |
| <label-list> |
| |
| <pce-label-map> ::= <SRP> |
| <LABEL> |
| <FEC> |
| |
| <label-list > ::= <LABEL> |
| [<label-list>] |
| |
| */ |
| protected static final Logger log = LoggerFactory.getLogger(PcepLabelUpdateMsgVer1.class); |
| |
| public static final byte PACKET_VERSION = 1; |
| |
| //LabelUpdateMsgMinLength = COMMON-HEADER(4)+SrpObjMinLentgh(12)+LabelObjectMinLength(12)+FECType1Object(8) |
| public static final int PACKET_MINIMUM_LENGTH = 36; |
| public static final PcepType MSG_TYPE = PcepType.LABEL_UPDATE; |
| //pce-label-update-list |
| private LinkedList<PcepLabelUpdate> llPcLabelUpdateList; |
| |
| static final PcepLabelUpdateMsgVer1.Reader READER = new Reader(); |
| |
| /** |
| * Reader reads LabelUpdate Message from the channel. |
| */ |
| static class Reader implements PcepMessageReader<PcepLabelUpdateMsg> { |
| |
| @Override |
| public PcepLabelUpdateMsg readFrom(ChannelBuffer cb) throws PcepParseException { |
| |
| if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) { |
| throw new PcepParseException("Readable bytes are less than Packet minimum 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.PCEP_1(1), got=" + version); |
| } |
| // fixed value property type == 13 |
| byte type = cb.readByte(); |
| if (type != MSG_TYPE.getType()) { |
| throw new PcepParseException("Wrong type. Expected=PcepType.LABEL_UPDATE(13), got=" + type); |
| } |
| short length = cb.readShort(); |
| if (length < PACKET_MINIMUM_LENGTH) { |
| throw new PcepParseException("Wrong length. Expected to be >= " + PACKET_MINIMUM_LENGTH + ", is: " |
| + length); |
| } |
| // parse <pce-label-download> / <pce-label-map> |
| LinkedList<PcepLabelUpdate> llPcLabelUpdateList = parsePcLabelUpdateList(cb); |
| return new PcepLabelUpdateMsgVer1(llPcLabelUpdateList); |
| } |
| |
| /** |
| * Returns list of PCEP Label Update object. |
| * |
| * @param cb of type channel buffer |
| * @return llPcLabelUpdateList list of PCEP label update object |
| * @throws PcepParseException when fails to parse list of PCEP label update object |
| */ |
| public LinkedList<PcepLabelUpdate> parsePcLabelUpdateList(ChannelBuffer cb) throws PcepParseException { |
| |
| LinkedList<PcepLabelUpdate> llPcLabelUpdateList; |
| llPcLabelUpdateList = new LinkedList<>(); |
| |
| while (0 < cb.readableBytes()) { |
| llPcLabelUpdateList.add(PcepLabelUpdateVer1.read(cb)); |
| } |
| return llPcLabelUpdateList; |
| } |
| } |
| |
| /** |
| * Constructor to initialize PCEP Label Update List. |
| * |
| * @param llPcLabelUpdateList list of PCEP Label Update object |
| */ |
| PcepLabelUpdateMsgVer1(LinkedList<PcepLabelUpdate> llPcLabelUpdateList) { |
| this.llPcLabelUpdateList = llPcLabelUpdateList; |
| } |
| |
| /** |
| * Builder class for PCEP label update message. |
| */ |
| static class Builder implements PcepLabelUpdateMsg.Builder { |
| |
| LinkedList<PcepLabelUpdate> llPcLabelUpdateList; |
| |
| @Override |
| public PcepVersion getVersion() { |
| return PcepVersion.PCEP_1; |
| } |
| |
| @Override |
| public PcepType getType() { |
| return PcepType.LABEL_UPDATE; |
| } |
| |
| @Override |
| public PcepLabelUpdateMsg build() { |
| return new PcepLabelUpdateMsgVer1(this.llPcLabelUpdateList); |
| } |
| |
| @Override |
| public LinkedList<PcepLabelUpdate> getPcLabelUpdateList() { |
| return this.llPcLabelUpdateList; |
| } |
| |
| @Override |
| public Builder setPcLabelUpdateList(LinkedList<PcepLabelUpdate> ll) { |
| this.llPcLabelUpdateList = ll; |
| return this; |
| } |
| } |
| |
| @Override |
| public void writeTo(ChannelBuffer cb) throws PcepParseException { |
| WRITER.write(cb, this); |
| } |
| |
| static final Writer WRITER = new Writer(); |
| |
| /** |
| * Writer writes LabelUpdate Message to the channel. |
| */ |
| static class Writer implements PcepMessageWriter<PcepLabelUpdateMsgVer1> { |
| |
| @Override |
| public void write(ChannelBuffer cb, PcepLabelUpdateMsgVer1 message) throws PcepParseException { |
| |
| 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 will be set after calculating length, but currently set it as 0. |
| int msgLenIndex = cb.writerIndex(); |
| |
| cb.writeShort((short) 0); |
| ListIterator<PcepLabelUpdate> listIterator = message.llPcLabelUpdateList.listIterator(); |
| |
| while (listIterator.hasNext()) { |
| PcepLabelUpdate labelUpdate = listIterator.next(); |
| labelUpdate.write(cb); |
| } |
| |
| // 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 LinkedList<PcepLabelUpdate> getPcLabelUpdateList() { |
| return this.llPcLabelUpdateList; |
| } |
| |
| @Override |
| public void setPcLabelUpdateList(LinkedList<PcepLabelUpdate> ll) { |
| this.llPcLabelUpdateList = ll; |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("PcLabelUpdateList", llPcLabelUpdateList) |
| .toString(); |
| } |
| } |