org.onosproject.common.DefaultTopology Maven / Gradle / Ivy
/*
* Copyright 2015-present Open Networking Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onosproject.common;
import com.google.common.base.Function;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSetMultimap;
import com.google.common.collect.ImmutableSetMultimap.Builder;
import org.onlab.graph.DefaultEdgeWeigher;
import org.onlab.graph.DijkstraGraphSearch;
import org.onlab.graph.DisjointPathPair;
import org.onlab.graph.GraphPathSearch;
import org.onlab.graph.GraphPathSearch.Result;
import org.onlab.graph.KShortestPathsSearch;
import org.onlab.graph.LazyKShortestPathsSearch;
import org.onlab.graph.ScalarWeight;
import org.onlab.graph.SrlgGraphSearch;
import org.onlab.graph.SuurballeGraphSearch;
import org.onlab.graph.TarjanGraphSearch;
import org.onlab.graph.TarjanGraphSearch.SccResult;
import org.onlab.graph.Weight;
import org.onosproject.net.AbstractModel;
import org.onosproject.net.ConnectPoint;
import org.onosproject.net.DefaultDisjointPath;
import org.onosproject.net.DefaultPath;
import org.onosproject.net.DeviceId;
import org.onosproject.net.DisjointPath;
import org.onosproject.net.Link;
import org.onosproject.net.Link.Type;
import org.onosproject.net.Path;
import org.onosproject.net.provider.ProviderId;
import org.onosproject.net.topology.ClusterId;
import org.onosproject.net.topology.DefaultTopologyCluster;
import org.onosproject.net.topology.DefaultTopologyVertex;
import org.onosproject.net.topology.GraphDescription;
import org.onosproject.net.topology.HopCountLinkWeigher;
import org.onosproject.net.topology.LinkWeigher;
import org.onosproject.net.topology.Topology;
import org.onosproject.net.topology.TopologyCluster;
import org.onosproject.net.topology.TopologyEdge;
import org.onosproject.net.topology.TopologyGraph;
import org.onosproject.net.topology.TopologyVertex;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
import static org.onlab.graph.GraphPathSearch.ALL_PATHS;
import static org.onlab.util.Tools.isNullOrEmpty;
import static org.onosproject.core.CoreService.CORE_PROVIDER_ID;
import static org.onosproject.net.Link.State.INACTIVE;
import static org.onosproject.net.Link.Type.INDIRECT;
/**
* Default implementation of the topology descriptor. This carries the backing
* topology data.
*/
public class DefaultTopology extends AbstractModel implements Topology {
private static final Logger log = LoggerFactory.getLogger(DefaultTopology.class);
private static final DijkstraGraphSearch DIJKSTRA =
new DijkstraGraphSearch<>();
private static final TarjanGraphSearch TARJAN =
new TarjanGraphSearch<>();
private static final SuurballeGraphSearch SUURBALLE =
new SuurballeGraphSearch<>();
private static final KShortestPathsSearch KSHORTEST =
new KShortestPathsSearch<>();
private static final LazyKShortestPathsSearch LAZY_KSHORTEST =
new LazyKShortestPathsSearch<>();
private static LinkWeigher defaultLinkWeigher = null;
private static GraphPathSearch defaultGraphPathSearch = null;
private final long time;
private final long creationTime;
private final long computeCost;
private final TopologyGraph graph;
private final LinkWeigher hopCountWeigher;
private final Supplier> clusterResults;
private final Supplier> clusters;
private final Supplier> infrastructurePoints;
private final Supplier> broadcastSets;
private final Function broadcastFunction;
private final Supplier clusterIndexes;
/**
* Sets the default link-weight to be used when computing paths. If null is
* specified, the builtin default link-weight measuring hop-counts will be
* used.
*
* @param linkWeigher new default link-weight
*/
public static synchronized void setDefaultLinkWeigher(LinkWeigher linkWeigher) {
log.info("Setting new default link-weight function to {}", linkWeigher);
defaultLinkWeigher = linkWeigher;
}
/**
* Sets the default lpath search algorighm to be used when computing paths.
* If null is specified, the builtin default Dijkstra will be used.
*
* @param graphPathSearch new default algorithm
*/
public static synchronized void setDefaultGraphPathSearch(
GraphPathSearch graphPathSearch) {
log.info("Setting new default graph path algorithm to {}", graphPathSearch);
defaultGraphPathSearch = graphPathSearch;
}
/**
* Creates a topology descriptor attributed to the specified provider.
*
* @param providerId identity of the provider
* @param description data describing the new topology
* @param broadcastFunction broadcast point function
*/
public DefaultTopology(ProviderId providerId, GraphDescription description,
Function broadcastFunction) {
super(providerId);
this.broadcastFunction = broadcastFunction;
this.time = description.timestamp();
this.creationTime = description.creationTime();
// Build the graph
this.graph = new DefaultTopologyGraph(description.vertexes(),
description.edges());
this.clusterResults = Suppliers.memoize(this::searchForClusters);
this.clusters = Suppliers.memoize(this::buildTopologyClusters);
this.clusterIndexes = Suppliers.memoize(this::buildIndexes);
this.hopCountWeigher = new HopCountLinkWeigher(graph.getVertexes().size());
this.broadcastSets = Suppliers.memoize(this::buildBroadcastSets);
this.infrastructurePoints = Suppliers.memoize(this::findInfrastructurePoints);
this.computeCost = Math.max(0, System.nanoTime() - time);
}
/**
* Creates a topology descriptor attributed to the specified provider.
*
* @param providerId identity of the provider
* @param description data describing the new topology
*/
public DefaultTopology(ProviderId providerId, GraphDescription description) {
this(providerId, description, null);
}
@Override
public long time() {
return time;
}
@Override
public long creationTime() {
return creationTime;
}
@Override
public long computeCost() {
return computeCost;
}
@Override
public int clusterCount() {
return clusters.get().size();
}
@Override
public int deviceCount() {
return graph.getVertexes().size();
}
@Override
public int linkCount() {
return graph.getEdges().size();
}
private ImmutableMap clustersByDevice() {
return clusterIndexes.get().clustersByDevice;
}
private ImmutableSetMultimap devicesByCluster() {
return clusterIndexes.get().devicesByCluster;
}
private ImmutableSetMultimap linksByCluster() {
return clusterIndexes.get().linksByCluster;
}
/**
* Returns the backing topology graph.
*
* @return topology graph
*/
public TopologyGraph getGraph() {
return graph;
}
/**
* Returns the set of topology clusters.
*
* @return set of clusters
*/
public Set getClusters() {
return ImmutableSet.copyOf(clusters.get().values());
}
/**
* Returns the specified topology cluster.
*
* @param clusterId cluster identifier
* @return topology cluster
*/
public TopologyCluster getCluster(ClusterId clusterId) {
return clusters.get().get(clusterId);
}
/**
* Returns the topology cluster that contains the given device.
*
* @param deviceId device identifier
* @return topology cluster
*/
public TopologyCluster getCluster(DeviceId deviceId) {
return clustersByDevice().get(deviceId);
}
/**
* Returns the set of cluster devices.
*
* @param cluster topology cluster
* @return cluster devices
*/
public Set getClusterDevices(TopologyCluster cluster) {
return devicesByCluster().get(cluster);
}
/**
* Returns the set of cluster links.
*
* @param cluster topology cluster
* @return cluster links
*/
public Set getClusterLinks(TopologyCluster cluster) {
return linksByCluster().get(cluster);
}
/**
* Indicates whether the given point is an infrastructure link end-point.
*
* @param connectPoint connection point
* @return true if infrastructure
*/
public boolean isInfrastructure(ConnectPoint connectPoint) {
return infrastructurePoints.get().contains(connectPoint);
}
/**
* Indicates whether the given point is part of a broadcast set.
*
* @param connectPoint connection point
* @return true if in broadcast set
*/
public boolean isBroadcastPoint(ConnectPoint connectPoint) {
if (broadcastFunction != null) {
return broadcastFunction.apply(connectPoint);
}
// Any non-infrastructure, i.e. edge points are assumed to be OK.
if (!isInfrastructure(connectPoint)) {
return true;
}
// Find the cluster to which the device belongs.
TopologyCluster cluster = clustersByDevice().get(connectPoint.deviceId());
checkArgument(cluster != null,
"No cluster found for device %s", connectPoint.deviceId());
// If the broadcast set is null or empty, or if the point explicitly
// belongs to it, return true.
Set points = broadcastSets.get().get(cluster.id());
return isNullOrEmpty(points) || points.contains(connectPoint);
}
/**
* Returns the size of the cluster broadcast set.
*
* @param clusterId cluster identifier
* @return size of the cluster broadcast set
*/
public int broadcastSetSize(ClusterId clusterId) {
return broadcastSets.get().get(clusterId).size();
}
/**
* Returns the set of the cluster broadcast points.
*
* @param clusterId cluster identifier
* @return set of cluster broadcast points
*/
public Set broadcastPoints(ClusterId clusterId) {
return broadcastSets.get().get(clusterId);
}
/**
* Returns the set of pre-computed shortest paths between source and
* destination devices.
*
* @param src source device
* @param dst destination device
* @return set of shortest paths
*/
public Set getPaths(DeviceId src, DeviceId dst) {
return getPaths(src, dst, linkWeight(), ALL_PATHS);
}
/**
* Computes on-demand the set of shortest paths between source and
* destination devices.
*
* @param src source device
* @param dst destination device
* @param weigher link weight function
* @return set of shortest paths
*/
public Set getPaths(DeviceId src, DeviceId dst, LinkWeigher weigher) {
return getPaths(src, dst, weigher, ALL_PATHS);
}
/**
* Computes on-demand the set of shortest paths between source and
* destination devices, the set of returned paths will be no more than,
* maxPaths in size. The first {@code maxPaths} paths will be returned
* maintaining any ordering guarantees provided by the underlying
* (default or if no default is specified {@link DijkstraGraphSearch})
* search. If returning all paths of a given length would exceed
* {@code maxPaths} a subset of paths of that length will be returned,
* which paths will be returned depends on the currently specified
* {@code GraphPathSearch}. See {@link #setDefaultGraphPathSearch}.
*
* @param src source device
* @param dst destination device
* @param weigher link weight function
* @param maxPaths maximum number of paths
* @return set of shortest paths
*/
public Set getPaths(DeviceId src, DeviceId dst, LinkWeigher weigher,
int maxPaths) {
DefaultTopologyVertex srcV = new DefaultTopologyVertex(src);
DefaultTopologyVertex dstV = new DefaultTopologyVertex(dst);
Set vertices = graph.getVertexes();
if (!vertices.contains(srcV) || !vertices.contains(dstV)) {
// src or dst not part of the current graph
return ImmutableSet.of();
}
GraphPathSearch.Result result =
graphPathSearch().search(graph, srcV, dstV, weigher, maxPaths);
ImmutableSet.Builder builder = ImmutableSet.builder();
for (org.onlab.graph.Path path : result.paths()) {
builder.add(networkPath(path));
}
return builder.build();
}
/**
* Computes on-demand the k-shortest paths between source and
* destination devices.
*
* @param src source device
* @param dst destination device
* @param maxPaths maximum number of paths (k)
* @return set of k-shortest paths
*/
public Set getKShortestPaths(DeviceId src, DeviceId dst,
int maxPaths) {
return getKShortestPaths(src, dst, linkWeight(), maxPaths);
}
/**
* Computes on-demand the k-shortest paths between source and
* destination devices.
*
* The first {@code maxPaths} paths will be returned
* in ascending order according to the provided {@code weigher}
*
* @param src source device
* @param dst destination device
* @param weigher link weight function
* @param maxPaths maximum number of paths (k)
* @return set of k-shortest paths
*/
public Set getKShortestPaths(DeviceId src, DeviceId dst,
LinkWeigher weigher,
int maxPaths) {
DefaultTopologyVertex srcV = new DefaultTopologyVertex(src);
DefaultTopologyVertex dstV = new DefaultTopologyVertex(dst);
Set vertices = graph.getVertexes();
if (!vertices.contains(srcV) || !vertices.contains(dstV)) {
// src or dst not part of the current graph
return ImmutableSet.of();
}
return KSHORTEST.search(graph, srcV, dstV, weigher, maxPaths)
.paths().stream()
.map(this::networkPath)
.collect(ImmutableSet.toImmutableSet());
}
/**
* Lazily computes on-demand the k-shortest paths between source and
* destination devices.
*
*
* @param src source device
* @param dst destination device
* @return stream of k-shortest paths
*/
public Stream getKShortestPaths(DeviceId src, DeviceId dst) {
return getKShortestPaths(src, dst, linkWeight());
}
/**
* Lazily computes on-demand the k-shortest paths between source and
* destination devices.
*
*
* @param src source device
* @param dst destination device
* @param weigher link weight function
* @return stream of k-shortest paths
*/
public Stream getKShortestPaths(DeviceId src, DeviceId dst,
LinkWeigher weigher) {
DefaultTopologyVertex srcV = new DefaultTopologyVertex(src);
DefaultTopologyVertex dstV = new DefaultTopologyVertex(dst);
Set vertices = graph.getVertexes();
if (!vertices.contains(srcV) || !vertices.contains(dstV)) {
// src or dst not part of the current graph
return Stream.empty();
}
return LAZY_KSHORTEST.lazyPathSearch(graph, srcV, dstV, weigher)
.map(this::networkPath);
}
/**
* Returns the set of pre-computed shortest disjoint path pairs between
* source and destination devices.
*
* @param src source device
* @param dst destination device
* @return set of shortest disjoint path pairs
*/
public Set getDisjointPaths(DeviceId src, DeviceId dst) {
return getDisjointPaths(src, dst, linkWeight());
}
/**
* Computes on-demand the set of shortest disjoint path pairs between
* source and destination devices.
*
* @param src source device
* @param dst destination device
* @param weigher link weight function
* @return set of disjoint shortest path pairs
*/
public Set getDisjointPaths(DeviceId src, DeviceId dst,
LinkWeigher weigher) {
DefaultTopologyVertex srcV = new DefaultTopologyVertex(src);
DefaultTopologyVertex dstV = new DefaultTopologyVertex(dst);
Set vertices = graph.getVertexes();
if (!vertices.contains(srcV) || !vertices.contains(dstV)) {
// src or dst not part of the current graph
return ImmutableSet.of();
}
GraphPathSearch.Result result =
SUURBALLE.search(graph, srcV, dstV, weigher, ALL_PATHS);
ImmutableSet.Builder builder = ImmutableSet.builder();
for (org.onlab.graph.Path path : result.paths()) {
DisjointPath disjointPath =
networkDisjointPath((DisjointPathPair) path);
if (disjointPath.backup() != null) {
builder.add(disjointPath);
}
}
return builder.build();
}
/**
* Computes on-demand the set of shortest disjoint risk groups path pairs
* between source and destination devices.
*
* @param src source device
* @param dst destination device
* @param weigher edge weight object
* @param riskProfile map representing risk groups for each edge
* @return set of shortest disjoint paths
*/
private Set disjointPaths(DeviceId src, DeviceId dst,
LinkWeigher weigher,
Map riskProfile) {
DefaultTopologyVertex srcV = new DefaultTopologyVertex(src);
DefaultTopologyVertex dstV = new DefaultTopologyVertex(dst);
Set vertices = graph.getVertexes();
if (!vertices.contains(srcV) || !vertices.contains(dstV)) {
// src or dst not part of the current graph
return ImmutableSet.of();
}
SrlgGraphSearch srlg =
new SrlgGraphSearch<>(riskProfile);
GraphPathSearch.Result result =
srlg.search(graph, srcV, dstV, weigher, ALL_PATHS);
ImmutableSet.Builder builder = ImmutableSet.builder();
for (org.onlab.graph.Path path : result.paths()) {
DisjointPath disjointPath =
networkDisjointPath((DisjointPathPair) path);
if (disjointPath.backup() != null) {
builder.add(disjointPath);
}
}
return builder.build();
}
/**
* Computes on-demand the set of shortest disjoint risk groups path pairs
* between source and destination devices.
*
* @param src source device
* @param dst destination device
* @param weigher edge weight object
* @param riskProfile map representing risk groups for each link
* @return set of shortest disjoint paths
*/
public Set getDisjointPaths(DeviceId src, DeviceId dst,
LinkWeigher weigher,
Map riskProfile) {
Map riskProfile2 = new HashMap<>();
for (Link l : riskProfile.keySet()) {
riskProfile2.put(new TopologyEdge() {
Link cur = l;
@Override
public Link link() {
return cur;
}
@Override
public TopologyVertex src() {
return () -> src;
}
@Override
public TopologyVertex dst() {
return () -> dst;
}
}, riskProfile.get(l));
}
return disjointPaths(src, dst, weigher, riskProfile2);
}
/**
* Computes on-demand the set of shortest disjoint risk groups path pairs
* between source and destination devices.
*
* @param src source device
* @param dst destination device
* @param riskProfile map representing risk groups for each link
* @return set of shortest disjoint paths
*/
public Set getDisjointPaths(DeviceId src, DeviceId dst,
Map riskProfile) {
return getDisjointPaths(src, dst, linkWeight(), riskProfile);
}
// Converts graph path to a network path with the same cost.
private Path networkPath(org.onlab.graph.Path path) {
List links = path.edges().stream().map(TopologyEdge::link)
.collect(Collectors.toList());
return new DefaultPath(CORE_PROVIDER_ID, links, path.cost());
}
private DisjointPath networkDisjointPath(
DisjointPathPair path) {
if (!path.hasBackup()) {
// There was no secondary path available.
return new DefaultDisjointPath(CORE_PROVIDER_ID,
(DefaultPath) networkPath(path.primary()),
null);
}
return new DefaultDisjointPath(CORE_PROVIDER_ID,
(DefaultPath) networkPath(path.primary()),
(DefaultPath) networkPath(path.secondary()));
}
// Searches for SCC clusters in the network topology graph using Tarjan
// algorithm.
private SccResult searchForClusters() {
return TARJAN.search(graph, new NoIndirectLinksWeigher());
}
// Builds the topology clusters and returns the id-cluster bindings.
private ImmutableMap buildTopologyClusters() {
ImmutableMap.Builder clusterBuilder =
ImmutableMap.builder();
SccResult results = clusterResults.get();
// Extract both vertexes and edges from the results; the lists form
// pairs along the same index.
List> clusterVertexes = results.clusterVertexes();
List> clusterEdges = results.clusterEdges();
// Scan over the lists and create a cluster from the results.
for (int i = 0, n = results.clusterCount(); i < n; i++) {
Set vertexSet = clusterVertexes.get(i);
Set edgeSet = clusterEdges.get(i);
ClusterId cid = ClusterId.clusterId(i);
DefaultTopologyCluster cluster = new DefaultTopologyCluster(cid,
vertexSet.size(),
edgeSet.size(),
findRoot(vertexSet));
clusterBuilder.put(cid, cluster);
}
return clusterBuilder.build();
}
// Finds the vertex whose device id is the lexicographical minimum in the
// specified set.
private TopologyVertex findRoot(Set vertexSet) {
TopologyVertex minVertex = null;
for (TopologyVertex vertex : vertexSet) {
if ((minVertex == null) || (vertex.deviceId()
.toString().compareTo(minVertex.deviceId().toString()) < 0)) {
minVertex = vertex;
}
}
return minVertex;
}
// Processes a map of broadcast sets for each cluster.
private ImmutableSetMultimap buildBroadcastSets() {
Builder builder = ImmutableSetMultimap.builder();
for (TopologyCluster cluster : clusters.get().values()) {
addClusterBroadcastSet(cluster, builder);
}
return builder.build();
}
// Finds all broadcast points for the cluster. These are those connection
// points which lie along the shortest paths between the cluster root and
// all other devices within the cluster.
private void addClusterBroadcastSet(TopologyCluster cluster,
Builder builder) {
// Use the graph root search results to build the broadcast set.
Result result =
DIJKSTRA.search(graph, cluster.root(), null, hopCountWeigher, 1);
for (Map.Entry> entry :
result.parents().entrySet()) {
TopologyVertex vertex = entry.getKey();
// Ignore any parents that lead outside the cluster.
if (clustersByDevice().get(vertex.deviceId()) != cluster) {
continue;
}
// Ignore any back-link sets that are empty.
Set parents = entry.getValue();
if (parents.isEmpty()) {
continue;
}
// Use the first back-link source and destinations to add to the
// broadcast set.
Link link = parents.iterator().next().link();
builder.put(cluster.id(), link.src());
builder.put(cluster.id(), link.dst());
}
}
// Collects and returns an set of all infrastructure link end-points.
private ImmutableSet findInfrastructurePoints() {
ImmutableSet.Builder builder = ImmutableSet.builder();
for (TopologyEdge edge : graph.getEdges()) {
if (edge.link().type() == Type.EDGE) {
// exclude EDGE link from infrastructure link
// - Device <-> Host
// - Device <-> remote domain Device
continue;
}
builder.add(edge.link().src());
builder.add(edge.link().dst());
}
return builder.build();
}
// Builds cluster-devices, cluster-links and device-cluster indexes.
private ClusterIndexes buildIndexes() {
// Prepare the index builders
ImmutableMap.Builder clusterBuilder =
ImmutableMap.builder();
ImmutableSetMultimap.Builder devicesBuilder =
ImmutableSetMultimap.builder();
ImmutableSetMultimap.Builder linksBuilder =
ImmutableSetMultimap.builder();
// Now scan through all the clusters
for (TopologyCluster cluster : clusters.get().values()) {
int i = cluster.id().index();
// Scan through all the cluster vertexes.
for (TopologyVertex vertex : clusterResults.get().clusterVertexes().get(i)) {
devicesBuilder.put(cluster, vertex.deviceId());
clusterBuilder.put(vertex.deviceId(), cluster);
}
// Scan through all the cluster edges.
for (TopologyEdge edge : clusterResults.get().clusterEdges().get(i)) {
linksBuilder.put(cluster, edge.link());
}
}
// Finalize all indexes.
return new ClusterIndexes(clusterBuilder.build(),
devicesBuilder.build(),
linksBuilder.build());
}
private GraphPathSearch graphPathSearch() {
return defaultGraphPathSearch != null ? defaultGraphPathSearch : DIJKSTRA;
}
private LinkWeigher linkWeight() {
return defaultLinkWeigher != null ? defaultLinkWeigher : hopCountWeigher;
}
// Link weight for preventing traversal over indirect links.
private static class NoIndirectLinksWeigher
extends DefaultEdgeWeigher
implements LinkWeigher {
@Override
public Weight weight(TopologyEdge edge) {
return (edge.link().state() == INACTIVE) ||
(edge.link().type() == INDIRECT) ?
getNonViableWeight() : new ScalarWeight(HOP_WEIGHT_VALUE);
}
}
static final class ClusterIndexes {
final ImmutableMap clustersByDevice;
final ImmutableSetMultimap devicesByCluster;
final ImmutableSetMultimap linksByCluster;
public ClusterIndexes(ImmutableMap clustersByDevice,
ImmutableSetMultimap devicesByCluster,
ImmutableSetMultimap linksByCluster) {
this.clustersByDevice = clustersByDevice;
this.devicesByCluster = devicesByCluster;
this.linksByCluster = linksByCluster;
}
}
@Override
public String toString() {
return toStringHelper(this)
.add("time", time)
.add("creationTime", creationTime)
.add("computeCost", computeCost)
.add("clusters", clusterCount())
.add("devices", deviceCount())
.add("links", linkCount()).toString();
}
}
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