mappingservice/yangmodel/src/main/java/org/opendaylight/lispflowmapping/lisp/serializer/MapRegisterSerializer.java

   1 /*
   2  * Copyright (c) 2014 Contextream, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.lispflowmapping.lisp.serializer;
   9
  10 import java.nio.ByteBuffer;
  11 import java.util.ArrayList;
  12
  13 import org.apache.commons.lang3.BooleanUtils;
  14 import org.opendaylight.lispflowmapping.lisp.serializer.exception.LispSerializationException;
  15 import org.opendaylight.lispflowmapping.lisp.type.LispMessageEnum;
  16 import org.opendaylight.lispflowmapping.lisp.util.ByteUtil;
  17 import org.opendaylight.lispflowmapping.lisp.util.NumberUtil;
  18 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.control.plane.rev150314.MapRegister;
  19 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.control.plane.rev150314.eidtolocatorrecords.EidToLocatorRecord;
  20 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.control.plane.rev150314.eidtolocatorrecords.EidToLocatorRecordBuilder;
  21 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.control.plane.rev150314.mapregisternotification.MapRegisterBuilder;
  22
  23 /**
  24  * This class deals with deserializing map register from udp to the java object.
  25  */
  26 public class MapRegisterSerializer {
  27
  28     private static final MapRegisterSerializer INSTANCE = new MapRegisterSerializer();
  29
  30     // Private constructor prevents instantiation from other classes
  31     private MapRegisterSerializer() {
  32     }
  33
  34     public static MapRegisterSerializer getInstance() {
  35         return INSTANCE;
  36     }
  37
  38     public ByteBuffer serialize(MapRegister mapRegister) {
  39         int size = Length.HEADER_SIZE;
  40         if (mapRegister.getAuthenticationData() != null) {
  41             size += mapRegister.getAuthenticationData().length;
  42         }
  43         if (mapRegister.isXtrSiteIdPresent() != null && mapRegister.isXtrSiteIdPresent()) {
  44             size += Length.XTRID_SIZE + Length.SITEID_SIZE;
  45         }
  46         for (EidToLocatorRecord eidToLocatorRecord : mapRegister.getEidToLocatorRecord()) {
  47             size += EidToLocatorRecordSerializer.getInstance().getSerializationSize(eidToLocatorRecord);
  48         }
  49
  50         ByteBuffer registerBuffer = ByteBuffer.allocate(size);
  51         registerBuffer.put((byte) ((byte) (LispMessageEnum.MapRegister.getValue() << 4) |
  52                 ByteUtil.boolToBit(BooleanUtils.isTrue(mapRegister.isProxyMapReply()), Flags.PROXY) |
  53                 ByteUtil.boolToBit(BooleanUtils.isTrue(mapRegister.isXtrSiteIdPresent()), Flags.XTRSITEID)));
  54         registerBuffer.position(registerBuffer.position() + Length.RES);
  55         registerBuffer.put(ByteUtil.boolToBit(BooleanUtils.isTrue(mapRegister.isWantMapNotify()), Flags.WANT_MAP_REPLY));
  56         registerBuffer.put((byte) mapRegister.getEidToLocatorRecord().size());
  57         registerBuffer.putLong(NumberUtil.asLong(mapRegister.getNonce()));
  58         registerBuffer.putShort(NumberUtil.asShort(mapRegister.getKeyId()));
  59
  60         if (mapRegister.getAuthenticationData() != null) {
  61             registerBuffer.putShort((short) mapRegister.getAuthenticationData().length);
  62             registerBuffer.put(mapRegister.getAuthenticationData());
  63         } else {
  64             registerBuffer.putShort((short) 0);
  65         }
  66         for (EidToLocatorRecord eidToLocatorRecord : mapRegister.getEidToLocatorRecord()) {
  67             EidToLocatorRecordSerializer.getInstance().serialize(registerBuffer, eidToLocatorRecord);
  68         }
  69
  70         if (mapRegister.isXtrSiteIdPresent() != null && mapRegister.isXtrSiteIdPresent()) {
  71             registerBuffer.put(mapRegister.getXtrId());
  72             registerBuffer.put(mapRegister.getSiteId());
  73         }
  74         registerBuffer.clear();
  75         return registerBuffer;
  76     }
  77
  78     public MapRegister deserialize(ByteBuffer registerBuffer) {
  79         try {
  80             MapRegisterBuilder builder = new MapRegisterBuilder();
  81             builder.setEidToLocatorRecord(new ArrayList<EidToLocatorRecord>());
  82
  83             byte typeAndFlags = registerBuffer.get();
  84             boolean xtrSiteIdPresent = ByteUtil.extractBit(typeAndFlags, Flags.XTRSITEID);
  85             builder.setProxyMapReply(ByteUtil.extractBit(typeAndFlags, Flags.PROXY));
  86             builder.setXtrSiteIdPresent(xtrSiteIdPresent);
  87
  88             registerBuffer.position(registerBuffer.position() + Length.RES);
  89             builder.setWantMapNotify(ByteUtil.extractBit(registerBuffer.get(), Flags.WANT_MAP_REPLY));
  90             byte recordCount = (byte) ByteUtil.getUnsignedByte(registerBuffer);
  91             builder.setNonce(registerBuffer.getLong());
  92             builder.setKeyId(registerBuffer.getShort());
  93             short authenticationLength = registerBuffer.getShort();
  94             byte[] authenticationData = new byte[authenticationLength];
  95             registerBuffer.get(authenticationData);
  96             builder.setAuthenticationData(authenticationData);
  97
  98             for (int i = 0; i < recordCount; i++) {
  99                 builder.getEidToLocatorRecord().add(
 100                         new EidToLocatorRecordBuilder(EidToLocatorRecordSerializer.getInstance().deserialize(registerBuffer)).build());
 101             }
 102
 103             if (xtrSiteIdPresent) {
 104                 byte[] xtrId  = new byte[Length.XTRID_SIZE];
 105                 registerBuffer.get(xtrId);
 106                 byte[] siteId = new byte[Length.SITEID_SIZE];
 107                 registerBuffer.get(siteId);
 108                 builder.setXtrId(xtrId);
 109                 builder.setSiteId(siteId);
 110             }
 111             registerBuffer.limit(registerBuffer.position());
 112             byte[] mapRegisterBytes = new byte[registerBuffer.position()];
 113             registerBuffer.position(0);
 114             registerBuffer.get(mapRegisterBytes);
 115             return builder.build();
 116         } catch (RuntimeException re) {
 117             throw new LispSerializationException("Couldn't deserialize Map-Register (len=" + registerBuffer.capacity() + ")", re);
 118         }
 119
 120     }
 121
 122     private interface Flags {
 123         byte PROXY = 0x08;
 124         byte XTRSITEID = 0x02;
 125         byte WANT_MAP_REPLY = 0x01;
 126     }
 127
 128     public interface Length {
 129         int HEADER_SIZE = 16;
 130         int XTRID_SIZE = 16;
 131         int SITEID_SIZE = 8;
 132         int RES = 1;
 133     }
 134 }