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
  14 import io.netty.buffer.ByteBuf;
  15 import io.netty.buffer.Unpooled;
  16
  17 import java.util.concurrent.ConcurrentHashMap;
  18 import java.util.concurrent.ConcurrentMap;
  19
  20 import org.opendaylight.bgp.concepts.NextHopUtil;
  21 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  22 import org.opendaylight.protocol.bgp.parser.BgpTableTypeImpl;
  23 import org.opendaylight.protocol.bgp.parser.spi.AddressFamilyRegistry;
  24 import org.opendaylight.protocol.bgp.parser.spi.NlriParser;
  25 import org.opendaylight.protocol.bgp.parser.spi.NlriRegistry;
  26 import org.opendaylight.protocol.bgp.parser.spi.NlriSerializer;
  27 import org.opendaylight.protocol.bgp.parser.spi.SubsequentAddressFamilyRegistry;
  28 import org.opendaylight.protocol.concepts.AbstractRegistration;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpReachNlri;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpReachNlriBuilder;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpUnreachNlri;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpUnreachNlriBuilder;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  36 import org.opendaylight.yangtools.yang.binding.DataObject;
  37
  38 final class SimpleNlriRegistry implements NlriRegistry {
  39
  40     private static final int RESERVED = 1;
  41
  42     private final ConcurrentMap<BgpTableType, NlriParser> handlers = new ConcurrentHashMap<>();
  43     private final ConcurrentMap<Class<? extends DataObject>, NlriSerializer> serializers = new ConcurrentHashMap<>();
  44     private final SubsequentAddressFamilyRegistry safiReg;
  45     private final AddressFamilyRegistry afiReg;
  46
  47     public SimpleNlriRegistry(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
  48         this.afiReg = Preconditions.checkNotNull(afiReg);
  49         this.safiReg = Preconditions.checkNotNull(safiReg);
  50     }
  51
  52     private static BgpTableType createKey(final Class<? extends AddressFamily> afi,
  53             final Class<? extends SubsequentAddressFamily> safi) {
  54         Preconditions.checkNotNull(afi);
  55         Preconditions.checkNotNull(safi);
  56         return new BgpTableTypeImpl(afi, safi);
  57     }
  58
  59     synchronized AutoCloseable registerNlriSerializer(final Class<? extends DataObject> nlriClass, final NlriSerializer serializer){
  60         final NlriParser prev = this.handlers.get(nlriClass);
  61         Preconditions.checkState(prev == null, "Serializer already bound to class " + prev);
  62
  63         this.serializers.put(nlriClass, serializer);
  64         final Object lock = this;
  65         return new AbstractRegistration() {
  66             @Override
  67             protected void removeRegistration() {
  68                 synchronized (lock) {
  69                     SimpleNlriRegistry.this.serializers.remove(nlriClass);
  70                 }
  71             }
  72         };
  73     }
  74
  75     synchronized AutoCloseable registerNlriParser(final Class<? extends AddressFamily> afi,
  76             final Class<? extends SubsequentAddressFamily> safi, final NlriParser parser) {
  77         final BgpTableType key = createKey(afi, safi);
  78         final NlriParser prev = this.handlers.get(key);
  79         Preconditions.checkState(prev == null, "AFI/SAFI is already bound to parser " + prev);
  80
  81         this.handlers.put(key, parser);
  82         final Object lock = this;
  83         return new AbstractRegistration() {
  84             @Override
  85             protected void removeRegistration() {
  86                 synchronized (lock) {
  87                     SimpleNlriRegistry.this.handlers.remove(key);
  88                 }
  89             }
  90         };
  91     }
  92
  93     private Class<? extends AddressFamily> getAfi(final ByteBuf buffer) throws BGPParsingException {
  94         final int afiVal = buffer.readUnsignedShort();
  95         final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afiVal);
  96         if (afi == null) {
  97             throw new BGPParsingException("Address Family Identifier: '" + afiVal + "' not supported.");
  98         }
  99         return afi;
 100     }
 101
 102     private Class<? extends SubsequentAddressFamily> getSafi(final ByteBuf buffer) throws BGPParsingException {
 103         final int safiVal = UnsignedBytes.toInt(buffer.readByte());
 104         final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safiVal);
 105         if (safi == null) {
 106             throw new BGPParsingException("Subsequent Address Family Identifier: '" + safiVal + "' not supported.");
 107         }
 108         return safi;
 109     }
 110
 111     @Override
 112     public MpUnreachNlri parseMpUnreach(final ByteBuf buffer) throws BGPParsingException {
 113         final MpUnreachNlriBuilder builder = new MpUnreachNlriBuilder();
 114         builder.setAfi(getAfi(buffer));
 115         builder.setSafi(getSafi(buffer));
 116
 117         final NlriParser parser = this.handlers.get(createKey(builder.getAfi(), builder.getSafi()));
 118         final ByteBuf nlri = buffer.slice();
 119         parser.parseNlri(nlri, builder);
 120         return builder.build();
 121     }
 122
 123     @Override
 124     public void serializeMpReach(MpReachNlri mpReachNlri, ByteBuf byteAggregator) {
 125         byteAggregator.writeShort(this.afiReg.numberForClass(mpReachNlri.getAfi()));
 126         byteAggregator.writeByte(this.safiReg.numberForClass(mpReachNlri.getSafi()));
 127
 128         final ByteBuf nextHopBuffer = Unpooled.buffer();
 129         NextHopUtil.serializeNextHop(mpReachNlri.getCNextHop(), nextHopBuffer);
 130
 131         byteAggregator.writeByte(nextHopBuffer.writerIndex());
 132         byteAggregator.writeBytes(nextHopBuffer);
 133         byteAggregator.writeZero(RESERVED);
 134     }
 135
 136     @Override
 137     public void serializeMpUnReach(MpUnreachNlri mpUnreachNlri, ByteBuf byteAggregator) {
 138         byteAggregator.writeShort(this.afiReg.numberForClass(mpUnreachNlri.getAfi()));
 139         byteAggregator.writeByte(this.safiReg.numberForClass(mpUnreachNlri.getSafi()));
 140     }
 141
 142     @Override
 143     public Iterable<NlriSerializer> getSerializers() {
 144         return Iterables.unmodifiableIterable(this.serializers.values());
 145     }
 146
 147     @Override
 148     public MpReachNlri parseMpReach(final ByteBuf buffer) throws BGPParsingException {
 149         final MpReachNlriBuilder builder = new MpReachNlriBuilder();
 150         builder.setAfi(getAfi(buffer));
 151         builder.setSafi(getSafi(buffer));
 152
 153         final NlriParser parser = this.handlers.get(createKey(builder.getAfi(), builder.getSafi()));
 154
 155         final int nextHopLength = UnsignedBytes.toInt(buffer.readByte());
 156         builder.setCNextHop(NextHopUtil.parseNextHop(buffer.slice(buffer.readerIndex(), nextHopLength)));
 157         buffer.skipBytes(nextHopLength + RESERVED);
 158
 159         final ByteBuf nlri = buffer.slice();
 160         parser.parseNlri(nlri, builder);
 161         return builder.build();
 162     }
 163 }