| package org.onlab.onos.net.intent.impl; |
| |
| import com.google.common.collect.HashMultimap; |
| import com.google.common.collect.SetMultimap; |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Deactivate; |
| import org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| import org.apache.felix.scr.annotations.Service; |
| import org.onlab.onos.event.Event; |
| import org.onlab.onos.net.Link; |
| import org.onlab.onos.net.LinkKey; |
| import org.onlab.onos.net.NetworkResource; |
| import org.onlab.onos.net.intent.IntentId; |
| import org.onlab.onos.net.link.LinkEvent; |
| import org.onlab.onos.net.topology.TopologyEvent; |
| import org.onlab.onos.net.topology.TopologyListener; |
| import org.onlab.onos.net.topology.TopologyService; |
| import org.slf4j.Logger; |
| |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.concurrent.ExecutorService; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.collect.Multimaps.synchronizedSetMultimap; |
| import static java.util.concurrent.Executors.newSingleThreadExecutor; |
| import static org.onlab.onos.net.LinkKey.linkKey; |
| import static org.onlab.onos.net.link.LinkEvent.Type.LINK_REMOVED; |
| import static org.onlab.util.Tools.namedThreads; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * Entity responsible for tracking installed flows and for monitoring topology |
| * events to determine what flows are affected by topology changes. |
| */ |
| @Component |
| @Service |
| public class ObjectiveTracker implements ObjectiveTrackerService { |
| |
| private final Logger log = getLogger(getClass()); |
| |
| private final SetMultimap<LinkKey, IntentId> intentsByLink = |
| synchronizedSetMultimap(HashMultimap.<LinkKey, IntentId>create()); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected TopologyService topologyService; |
| |
| private ExecutorService executorService = |
| newSingleThreadExecutor(namedThreads("onos-flowtracker")); |
| |
| private TopologyListener listener = new InternalTopologyListener(); |
| private TopologyChangeDelegate delegate; |
| |
| @Activate |
| public void activate() { |
| topologyService.addListener(listener); |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| topologyService.removeListener(listener); |
| log.info("Stopped"); |
| } |
| |
| @Override |
| public void setDelegate(TopologyChangeDelegate delegate) { |
| checkNotNull(delegate, "Delegate cannot be null"); |
| checkArgument(this.delegate == null || this.delegate == delegate, |
| "Another delegate already set"); |
| this.delegate = delegate; |
| } |
| |
| @Override |
| public void unsetDelegate(TopologyChangeDelegate delegate) { |
| checkArgument(this.delegate == delegate, "Not the current delegate"); |
| this.delegate = null; |
| } |
| |
| @Override |
| public void addTrackedResources(IntentId intentId, |
| Collection<NetworkResource> resources) { |
| for (NetworkResource resource : resources) { |
| if (resource instanceof Link) { |
| intentsByLink.put(linkKey((Link) resource), intentId); |
| } |
| } |
| } |
| |
| @Override |
| public void removeTrackedResources(IntentId intentId, |
| Collection<NetworkResource> resources) { |
| for (NetworkResource resource : resources) { |
| if (resource instanceof Link) { |
| intentsByLink.remove(linkKey((Link) resource), intentId); |
| } |
| } |
| } |
| |
| // Internal re-actor to topology change events. |
| private class InternalTopologyListener implements TopologyListener { |
| @Override |
| public void event(TopologyEvent event) { |
| executorService.execute(new TopologyChangeHandler(event)); |
| } |
| } |
| |
| // Re-dispatcher of topology change events. |
| private class TopologyChangeHandler implements Runnable { |
| |
| private final TopologyEvent event; |
| |
| TopologyChangeHandler(TopologyEvent event) { |
| this.event = event; |
| } |
| |
| @Override |
| public void run() { |
| if (event.reasons() == null) { |
| delegate.triggerCompile(new HashSet<IntentId>(), true); |
| |
| } else { |
| Set<IntentId> toBeRecompiled = new HashSet<>(); |
| boolean recompileOnly = true; |
| |
| // Scan through the list of reasons and keep accruing all |
| // intents that need to be recompiled. |
| for (Event reason : event.reasons()) { |
| if (reason instanceof LinkEvent) { |
| LinkEvent linkEvent = (LinkEvent) reason; |
| if (linkEvent.type() == LINK_REMOVED) { |
| Set<IntentId> intentIds = intentsByLink.get(linkKey(linkEvent.subject())); |
| toBeRecompiled.addAll(intentIds); |
| } |
| recompileOnly = recompileOnly && linkEvent.type() == LINK_REMOVED; |
| } |
| } |
| |
| delegate.triggerCompile(toBeRecompiled, !recompileOnly); |
| } |
| } |
| } |
| |
| } |