bgp/parser-spi/src/main/java/org/opendaylight/protocol/bgp/parser/spi/pojo/SimpleNlriRegistry.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, 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.protocol.bgp.parser.spi.pojo;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.collect.Iterables;
  12 import com.google.common.primitives.UnsignedBytes;
  13 import io.netty.buffer.ByteBuf;
  14 import io.netty.buffer.Unpooled;
  15 import java.util.concurrent.ConcurrentHashMap;
  16 import java.util.concurrent.ConcurrentMap;
  17 import org.opendaylight.bgp.concepts.NextHopUtil;
  18 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  19 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
  20 import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
  21 import org.opendaylight.protocol.bgp.parser.spi.NlriParser;
  22 import org.opendaylight.protocol.bgp.parser.spi.NlriRegistry;
  23 import org.opendaylight.protocol.bgp.parser.spi.NlriSerializer;
  24 import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
  25 import org.opendaylight.protocol.concepts.AbstractRegistration;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpReachNlri;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpReachNlriBuilder;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpUnreachNlri;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpUnreachNlriBuilder;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  33 import org.opendaylight.yangtools.yang.binding.DataObject;
  34
  35 final class SimpleNlriRegistry implements NlriRegistry {
  36
  37     private static final int RESERVED = 1;
  38
  39     private final ConcurrentMap<BgpTableType, NlriParser> handlers = new ConcurrentHashMap<>();
  40     private final ConcurrentMap<Class<? extends DataObject>, NlriSerializer> serializers = new ConcurrentHashMap<>();
  41     private final SubsequentAddressFamilyRegistry safiReg;
  42     private final AddressFamilyRegistry afiReg;
  43
  44     public SimpleNlriRegistry(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
  45         this.afiReg = Preconditions.checkNotNull(afiReg);
  46         this.safiReg = Preconditions.checkNotNull(safiReg);
  47     }
  48
  49     private static BgpTableType createKey(final Class<? extends AddressFamily> afi,
  50             final Class<? extends SubsequentAddressFamily> safi) {
  51         Preconditions.checkNotNull(afi);
  52         Preconditions.checkNotNull(safi);
  53         return new BgpTableTypeImpl(afi, safi);
  54     }
  55
  56     synchronized AutoCloseable registerNlriSerializer(final Class<? extends DataObject> nlriClass, final NlriSerializer serializer){
  57         final NlriSerializer prev = this.serializers.get(nlriClass);
  58         Preconditions.checkState(prev == null, "Serializer already bound to class " + prev);
  59
  60         this.serializers.put(nlriClass, serializer);
  61         final Object lock = this;
  62         return new AbstractRegistration() {
  63             @Override
  64             protected void removeRegistration() {
  65                 synchronized (lock) {
  66                     SimpleNlriRegistry.this.serializers.remove(nlriClass);
  67                 }
  68             }
  69         };
  70     }
  71
  72     synchronized AutoCloseable registerNlriParser(final Class<? extends AddressFamily> afi,
  73             final Class<? extends SubsequentAddressFamily> safi, final NlriParser parser) {
  74         final BgpTableType key = createKey(afi, safi);
  75         final NlriParser prev = this.handlers.get(key);
  76         Preconditions.checkState(prev == null, "AFI/SAFI is already bound to parser " + prev);
  77
  78         this.handlers.put(key, parser);
  79         final Object lock = this;
  80         return new AbstractRegistration() {
  81             @Override
  82             protected void removeRegistration() {
  83                 synchronized (lock) {
  84                     SimpleNlriRegistry.this.handlers.remove(key);
  85                 }
  86             }
  87         };
  88     }
  89
  90     private Class<? extends AddressFamily> getAfi(final ByteBuf buffer) throws BGPParsingException {
  91         final int afiVal = buffer.readUnsignedShort();
  92         final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afiVal);
  93         if (afi == null) {
  94             throw new BGPParsingException("Address Family Identifier: '" + afiVal + "' not supported.");
  95         }
  96         return afi;
  97     }
  98
  99     private Class<? extends SubsequentAddressFamily> getSafi(final ByteBuf buffer) throws BGPParsingException {
 100         final int safiVal = UnsignedBytes.toInt(buffer.readByte());
 101         final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safiVal);
 102         if (safi == null) {
 103             throw new BGPParsingException("Subsequent Address Family Identifier: '" + safiVal + "' not supported.");
 104         }
 105         return safi;
 106     }
 107
 108     @Override
 109     public MpUnreachNlri parseMpUnreach(final ByteBuf buffer) throws BGPParsingException {
 110         final MpUnreachNlriBuilder builder = new MpUnreachNlriBuilder();
 111         builder.setAfi(getAfi(buffer));
 112         builder.setSafi(getSafi(buffer));
 113
 114         final NlriParser parser = this.handlers.get(createKey(builder.getAfi(), builder.getSafi()));
 115         final ByteBuf nlri = buffer.slice();
 116         parser.parseNlri(nlri, builder);
 117         return builder.build();
 118     }
 119
 120     @Override
 121     public void serializeMpReach(final MpReachNlri mpReachNlri, final ByteBuf byteAggregator) {
 122         byteAggregator.writeShort(this.afiReg.numberForClass(mpReachNlri.getAfi()));
 123         byteAggregator.writeByte(this.safiReg.numberForClass(mpReachNlri.getSafi()));
 124
 125         final ByteBuf nextHopBuffer = Unpooled.buffer();
 126         NextHopUtil.serializeNextHop(mpReachNlri.getCNextHop(), nextHopBuffer);
 127
 128         byteAggregator.writeByte(nextHopBuffer.writerIndex());
 129         byteAggregator.writeBytes(nextHopBuffer);
 130         byteAggregator.writeZero(RESERVED);
 131     }
 132
 133     @Override
 134     public void serializeMpUnReach(final MpUnreachNlri mpUnreachNlri, final ByteBuf byteAggregator) {
 135         byteAggregator.writeShort(this.afiReg.numberForClass(mpUnreachNlri.getAfi()));
 136         byteAggregator.writeByte(this.safiReg.numberForClass(mpUnreachNlri.getSafi()));
 137     }
 138
 139     @Override
 140     public Iterable<NlriSerializer> getSerializers() {
 141         return Iterables.unmodifiableIterable(this.serializers.values());
 142     }
 143
 144     @Override
 145     public MpReachNlri parseMpReach(final ByteBuf buffer) throws BGPParsingException {
 146         final MpReachNlriBuilder builder = new MpReachNlriBuilder();
 147         builder.setAfi(getAfi(buffer));
 148         builder.setSafi(getSafi(buffer));
 149
 150         final NlriParser parser = this.handlers.get(createKey(builder.getAfi(), builder.getSafi()));
 151
 152         final int nextHopLength = UnsignedBytes.toInt(buffer.readByte());
 153         builder.setCNextHop(NextHopUtil.parseNextHop(buffer.readSlice(nextHopLength)));
 154         buffer.skipBytes(RESERVED);
 155
 156         final ByteBuf nlri = buffer.slice();
 157         parser.parseNlri(nlri, builder);
 158         return builder.build();
 159     }
 160 }