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