2 * Copyright (c) 2013 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.protocol.bgp.parser.spi.pojo;
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.path.attributes.MpReachNlri;
27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpReachNlriBuilder;
28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.attributes.MpUnreachNlri;
29 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.path.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;
34 final class SimpleNlriRegistry implements NlriRegistry {
36 private static final int RESERVED = 1;
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;
43 public SimpleNlriRegistry(final AddressFamilyRegistry afiReg, final SubsequentAddressFamilyRegistry safiReg) {
44 this.afiReg = Preconditions.checkNotNull(afiReg);
45 this.safiReg = Preconditions.checkNotNull(safiReg);
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);
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);
59 this.serializers.put(nlriClass, serializer);
60 final Object lock = this;
61 return new AbstractRegistration() {
63 protected void removeRegistration() {
65 SimpleNlriRegistry.this.serializers.remove(nlriClass);
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);
77 this.handlers.put(key, parser);
78 final Object lock = this;
79 return new AbstractRegistration() {
81 protected void removeRegistration() {
83 SimpleNlriRegistry.this.handlers.remove(key);
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);
93 throw new BGPParsingException("Address Family Identifier: '" + afiVal + "' not supported.");
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);
102 throw new BGPParsingException("Subsequent Address Family Identifier: '" + safiVal + "' not supported.");
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));
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();
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()));
124 final ByteBuf nextHopBuffer = Unpooled.buffer();
125 NextHopUtil.serializeNextHop(mpReachNlri.getCNextHop(), nextHopBuffer);
127 byteAggregator.writeByte(nextHopBuffer.writerIndex());
128 byteAggregator.writeBytes(nextHopBuffer);
129 byteAggregator.writeZero(RESERVED);
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()));
139 public Iterable<NlriSerializer> getSerializers() {
140 return Iterables.unmodifiableIterable(this.serializers.values());
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));
149 final NlriParser parser = this.handlers.get(createKey(builder.getAfi(), builder.getSafi()));
151 final int nextHopLength = buffer.readUnsignedByte();
152 builder.setCNextHop(NextHopUtil.parseNextHop(buffer.readSlice(nextHopLength)));
153 buffer.skipBytes(RESERVED);
155 final ByteBuf nlri = buffer.slice();
156 parser.parseNlri(nlri, builder);
157 return builder.build();