Java tutorial
/* * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved. * * This program and the accompanying materials are made available under the * terms of the Eclipse Public License v1.0 which accompanies this distribution, * and is available at http://www.eclipse.org/legal/epl-v10.html */ package org.opendaylight.protocol.bgp.linkstate.attribute; import com.google.common.annotations.VisibleForTesting; import com.google.common.base.Charsets; import com.google.common.collect.Multimap; import io.netty.buffer.ByteBuf; import io.netty.buffer.ByteBufUtil; import io.netty.buffer.Unpooled; import java.util.ArrayList; import java.util.List; import java.util.Map.Entry; import org.opendaylight.protocol.bgp.linkstate.attribute.sr.SrNodeAttributesParser; import org.opendaylight.protocol.bgp.linkstate.spi.TlvUtil; import org.opendaylight.protocol.util.BitArray; import org.opendaylight.protocol.util.ByteArray; import org.opendaylight.protocol.util.Ipv4Util; import org.opendaylight.protocol.util.Ipv6Util; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.Ipv4RouterIdentifier; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.Ipv6RouterIdentifier; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.IsisAreaIdentifier; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.NodeFlagBits; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.ProtocolId; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.TopologyIdentifier; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.LinkStateAttribute; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.NodeAttributesCase; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.NodeAttributesCaseBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.node.attributes._case.NodeAttributes; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.linkstate.path.attribute.link.state.attribute.node.attributes._case.NodeAttributesBuilder; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.node.state.SrAlgorithm; import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.linkstate.rev150210.node.state.SrCapabilities; import org.slf4j.Logger; import org.slf4j.LoggerFactory; @VisibleForTesting public final class NodeAttributesParser { private static final Logger LOG = LoggerFactory.getLogger(NodeAttributesParser.class); private NodeAttributesParser() { throw new UnsupportedOperationException(); } private static final int FLAGS_SIZE = 8; // node flag bits private static final int OVERLOAD_BIT = 0; private static final int ATTACHED_BIT = 1; private static final int EXTERNAL_BIT = 2; private static final int ABBR_BIT = 3; private static final int ROUTER_BIT = 4; private static final int V6_BIT = 5; /* Node Attribute TLVs */ private static final int NODE_FLAG_BITS = 1024; private static final int NODE_OPAQUE = 1025; private static final int DYNAMIC_HOSTNAME = 1026; private static final int ISIS_AREA_IDENTIFIER = 1027; /* Segment routing TLVs */ private static final int SR_CAPABILITIES = 1034; private static final int SR_ALGORITHMS = 1035; /** * Parse Node Attributes. * * @param attributes key is the tlv type and value is the value of the tlv * @param protocolId to differentiate parsing methods * @return {@link LinkStateAttribute} */ static LinkStateAttribute parseNodeAttributes(final Multimap<Integer, ByteBuf> attributes, final ProtocolId protocolId) { final List<TopologyIdentifier> topologyMembership = new ArrayList<>(); final List<IsisAreaIdentifier> areaMembership = new ArrayList<>(); final NodeAttributesBuilder builder = new NodeAttributesBuilder(); for (final Entry<Integer, ByteBuf> entry : attributes.entries()) { final int key = entry.getKey(); final ByteBuf value = entry.getValue(); LOG.trace("Node attribute TLV {}", key); switch (key) { case TlvUtil.MULTI_TOPOLOGY_ID: parseTopologyId(topologyMembership, value); break; case NODE_FLAG_BITS: final BitArray flags = BitArray.valueOf(value, FLAGS_SIZE); builder.setNodeFlags(new NodeFlagBits(flags.get(OVERLOAD_BIT), flags.get(ATTACHED_BIT), flags.get(EXTERNAL_BIT), flags.get(ABBR_BIT), flags.get(ROUTER_BIT), flags.get(V6_BIT))); LOG.debug("Parsed Overload bit: {}, attached bit: {}, external bit: {}, area border router: {}.", flags.get(OVERLOAD_BIT), flags.get(ATTACHED_BIT), flags.get(EXTERNAL_BIT), flags.get(ABBR_BIT)); break; case NODE_OPAQUE: if (LOG.isDebugEnabled()) { LOG.debug("Ignoring opaque value: {}.", ByteBufUtil.hexDump(value)); } break; case DYNAMIC_HOSTNAME: builder.setDynamicHostname(new String(ByteArray.readAllBytes(value), Charsets.US_ASCII)); LOG.debug("Parsed Node Name {}", builder.getDynamicHostname()); break; case ISIS_AREA_IDENTIFIER: final IsisAreaIdentifier ai = new IsisAreaIdentifier(ByteArray.readAllBytes(value)); areaMembership.add(ai); LOG.debug("Parsed AreaIdentifier {}", ai); break; case TlvUtil.LOCAL_IPV4_ROUTER_ID: final Ipv4RouterIdentifier ip4 = new Ipv4RouterIdentifier(Ipv4Util.addressForByteBuf(value)); builder.setIpv4RouterId(ip4); LOG.debug("Parsed IPv4 Router Identifier {}", ip4); break; case TlvUtil.LOCAL_IPV6_ROUTER_ID: final Ipv6RouterIdentifier ip6 = new Ipv6RouterIdentifier(Ipv6Util.addressForByteBuf(value)); builder.setIpv6RouterId(ip6); LOG.debug("Parsed IPv6 Router Identifier {}", ip6); break; case SR_CAPABILITIES: final SrCapabilities caps = SrNodeAttributesParser.parseSrCapabilities(value, protocolId); builder.setSrCapabilities(caps); LOG.debug("Parsed SR Capabilities {}", caps); break; case SR_ALGORITHMS: final SrAlgorithm algs = SrNodeAttributesParser.parseSrAlgorithms(value); builder.setSrAlgorithm(algs); LOG.debug("Parsed SR Algorithms {}", algs); break; default: LOG.warn("TLV {} is not a valid node attribute, ignoring it", key); } } LOG.trace("Finished parsing Node Attributes."); builder.setTopologyIdentifier(topologyMembership); builder.setIsisAreaId(areaMembership); return new NodeAttributesCaseBuilder().setNodeAttributes(builder.build()).build(); } private static void parseTopologyId(final List<TopologyIdentifier> topologyMembership, final ByteBuf value) { while (value.isReadable()) { final TopologyIdentifier topId = new TopologyIdentifier( value.readUnsignedShort() & TlvUtil.TOPOLOGY_ID_OFFSET); topologyMembership.add(topId); LOG.debug("Parsed Topology Identifier: {}", topId); } } static void serializeNodeAttributes(final NodeAttributesCase nodeAttributesCase, final ByteBuf byteAggregator) { LOG.trace("Started serializing Node Attributes"); final NodeAttributes nodeAttributes = nodeAttributesCase.getNodeAttributes(); serializeTopologyId(nodeAttributes.getTopologyIdentifier(), byteAggregator); serializeNodeFlagBits(nodeAttributes.getNodeFlags(), byteAggregator); if (nodeAttributes.getDynamicHostname() != null) { TlvUtil.writeTLV(DYNAMIC_HOSTNAME, Unpooled.wrappedBuffer(Charsets.UTF_8.encode(nodeAttributes.getDynamicHostname())), byteAggregator); } final List<IsisAreaIdentifier> isisList = nodeAttributes.getIsisAreaId(); if (isisList != null) { for (final IsisAreaIdentifier isisAreaIdentifier : isisList) { TlvUtil.writeTLV(ISIS_AREA_IDENTIFIER, Unpooled.wrappedBuffer(isisAreaIdentifier.getValue()), byteAggregator); } } if (nodeAttributes.getIpv4RouterId() != null) { TlvUtil.writeTLV(TlvUtil.LOCAL_IPV4_ROUTER_ID, Ipv4Util.byteBufForAddress(nodeAttributes.getIpv4RouterId()), byteAggregator); } if (nodeAttributes.getIpv6RouterId() != null) { TlvUtil.writeTLV(TlvUtil.LOCAL_IPV6_ROUTER_ID, Ipv6Util.byteBufForAddress(nodeAttributes.getIpv6RouterId()), byteAggregator); } if (nodeAttributes.getSrCapabilities() != null) { final ByteBuf capBuffer = Unpooled.buffer(); SrNodeAttributesParser.serializeSrCapabilities(nodeAttributes.getSrCapabilities(), capBuffer); TlvUtil.writeTLV(SR_CAPABILITIES, capBuffer, byteAggregator); } if (nodeAttributes.getSrAlgorithm() != null) { final ByteBuf capBuffer = Unpooled.buffer(); SrNodeAttributesParser.serializeSrAlgorithms(nodeAttributes.getSrAlgorithm(), capBuffer); TlvUtil.writeTLV(SR_ALGORITHMS, capBuffer, byteAggregator); } LOG.trace("Finished serializing Node Attributes"); } private static void serializeTopologyId(final List<TopologyIdentifier> topList, final ByteBuf byteAggregator) { if (topList != null) { final ByteBuf mpIdBuf = Unpooled.buffer(); for (final TopologyIdentifier topologyIdentifier : topList) { mpIdBuf.writeShort(topologyIdentifier.getValue()); } TlvUtil.writeTLV(TlvUtil.MULTI_TOPOLOGY_ID, mpIdBuf, byteAggregator); } } private static void serializeNodeFlagBits(final NodeFlagBits nodeFlagBits, final ByteBuf byteAggregator) { if (nodeFlagBits != null) { final ByteBuf nodeFlagBuf = Unpooled.buffer(1); final BitArray flags = new BitArray(FLAGS_SIZE); flags.set(OVERLOAD_BIT, nodeFlagBits.isOverload()); flags.set(ATTACHED_BIT, nodeFlagBits.isAttached()); flags.set(EXTERNAL_BIT, nodeFlagBits.isExternal()); flags.set(ABBR_BIT, nodeFlagBits.isAbr()); flags.set(ROUTER_BIT, nodeFlagBits.isRouter()); flags.set(V6_BIT, nodeFlagBits.isV6()); flags.toByteBuf(nodeFlagBuf); TlvUtil.writeTLV(NODE_FLAG_BITS, nodeFlagBuf, byteAggregator); } } }