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.protocol.bgp.concepts.util.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.protocol.util.ByteArray;
  30 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
  31 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpReachNlri;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpReachNlriBuilder;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpUnreachNlri;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpUnreachNlriBuilder;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  37 import org.opendaylight.yangtools.yang.binding.DataObject;
  38
  39 final class SimpleNlriRegistry implements NlriRegistry {
  40
  41     private static final int RESERVED = 1;
  42
  43     private final ConcurrentMap<BgpTableType, NlriParser> handlers = new ConcurrentHashMap<>();
  44     private final ConcurrentMap<Class<? extends DataObject>, NlriSerializer> serializers = new ConcurrentHashMap<>();
  45     private final SubsequentAddressFamilyRegistry safiReg;
  46     private final AddressFamilyRegistry afiReg;
  47
  48     public SimpleNlriRegistry(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
  49         this.afiReg = Preconditions.checkNotNull(afiReg);
  50         this.safiReg = Preconditions.checkNotNull(safiReg);
  51     }
  52
  53     private static BgpTableType createKey(final Class<? extends AddressFamily> afi,
  54             final Class<? extends SubsequentAddressFamily> safi) {
  55         Preconditions.checkNotNull(afi);
  56         Preconditions.checkNotNull(safi);
  57         return new BgpTableTypeImpl(afi, safi);
  58     }
  59
  60     synchronized AutoCloseable registerNlriSerializer(final Class<? extends DataObject> nlriClass, final NlriSerializer serializer){
  61         final NlriParser prev = this.handlers.get(nlriClass);
  62         Preconditions.checkState(prev == null, "Serializer already bound to class " + prev);
  63
  64         this.serializers.put(nlriClass, serializer);
  65         final Object lock = this;
  66         return new AbstractRegistration() {
  67             @Override
  68             protected void removeRegistration() {
  69                 synchronized (lock) {
  70                     SimpleNlriRegistry.this.serializers.remove(nlriClass);
  71                 }
  72             }
  73         };
  74     }
  75
  76     synchronized AutoCloseable registerNlriParser(final Class<? extends AddressFamily> afi,
  77             final Class<? extends SubsequentAddressFamily> safi, final NlriParser parser) {
  78         final BgpTableType key = createKey(afi, safi);
  79         final NlriParser prev = this.handlers.get(key);
  80         Preconditions.checkState(prev == null, "AFI/SAFI is already bound to parser " + prev);
  81
  82         this.handlers.put(key, parser);
  83         final Object lock = this;
  84         return new AbstractRegistration() {
  85             @Override
  86             protected void removeRegistration() {
  87                 synchronized (lock) {
  88                     SimpleNlriRegistry.this.handlers.remove(key);
  89                 }
  90             }
  91         };
  92     }
  93
  94     private Class<? extends AddressFamily> getAfi(final ByteBuf buffer) throws BGPParsingException {
  95         final int afiVal = buffer.readUnsignedShort();
  96         final Class<? extends AddressFamily> afi = this.afiReg.classForFamily(afiVal);
  97         if (afi == null) {
  98             throw new BGPParsingException("Address Family Identifier: '" + afiVal + "' not supported.");
  99         }
 100         return afi;
 101     }
 102
 103     private Class<? extends SubsequentAddressFamily> getSafi(final ByteBuf buffer) throws BGPParsingException {
 104         final int safiVal = UnsignedBytes.toInt(buffer.readByte());
 105         final Class<? extends SubsequentAddressFamily> safi = this.safiReg.classForFamily(safiVal);
 106         if (safi == null) {
 107             throw new BGPParsingException("Subsequent Address Family Identifier: '" + safiVal + "' not supported.");
 108         }
 109         return safi;
 110     }
 111
 112     @Override
 113     public MpUnreachNlri parseMpUnreach(final ByteBuf buffer) throws BGPParsingException {
 114         final MpUnreachNlriBuilder builder = new MpUnreachNlriBuilder();
 115         builder.setAfi(getAfi(buffer));
 116         builder.setSafi(getSafi(buffer));
 117
 118         final NlriParser parser = this.handlers.get(createKey(builder.getAfi(), builder.getSafi()));
 119         final ByteBuf nlri = buffer.slice();
 120         parser.parseNlri(nlri, builder);
 121         return builder.build();
 122     }
 123
 124     @Override
 125     public void serializeMpReach(MpReachNlri mpReachNlri, ByteBuf byteAggregator) {
 126
 127         byteAggregator.writeShort(this.afiReg.numberForClass(mpReachNlri.getAfi()));
 128         byteAggregator.writeByte(this.safiReg.numberForClass(mpReachNlri.getSafi()));
 129
 130         ByteBuf nextHopBuffer = Unpooled.buffer();
 131         NextHopUtil.serializeNextHopSimple(mpReachNlri.getCNextHop(), nextHopBuffer);
 132
 133         byteAggregator.writeByte(nextHopBuffer.writerIndex());
 134         byteAggregator.writeBytes(nextHopBuffer);
 135         byteAggregator.writeZero(RESERVED);
 136     }
 137
 138     @Override
 139     public void serializeMpUnReach(MpUnreachNlri mpUnreachNlri, ByteBuf byteAggregator) {
 140
 141         byteAggregator.writeShort(this.afiReg.numberForClass(mpUnreachNlri.getAfi()));
 142         byteAggregator.writeByte(this.safiReg.numberForClass(mpUnreachNlri.getSafi()));
 143     }
 144
 145     @Override
 146     public Iterable<NlriSerializer> getSerializers() {
 147         return Iterables.unmodifiableIterable(this.serializers.values());
 148     }
 149
 150     @Override
 151     public MpReachNlri parseMpReach(final ByteBuf buffer) throws BGPParsingException {
 152         final MpReachNlriBuilder builder = new MpReachNlriBuilder();
 153         builder.setAfi(getAfi(buffer));
 154         builder.setSafi(getSafi(buffer));
 155
 156         final NlriParser parser = this.handlers.get(createKey(builder.getAfi(), builder.getSafi()));
 157
 158         final int nextHopLength = UnsignedBytes.toInt(buffer.readByte());
 159         final byte[] nextHop = ByteArray.readBytes(buffer, nextHopLength);
 160         buffer.skipBytes(RESERVED);
 161
 162         final ByteBuf nlri = buffer.slice();
 163         parser.parseNlri(nlri, nextHop, builder);
 164         return builder.build();
 165     }
 166 }