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