Added BMv2 demo apps (onos1.6 cherry-pick)
Change-Id: I19484a826acce724c1fcd5b6e9910d724bda686f
diff --git a/apps/bmv2-demo/common/pom.xml b/apps/bmv2-demo/common/pom.xml
new file mode 100644
index 0000000..c0a0141
--- /dev/null
+++ b/apps/bmv2-demo/common/pom.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ ~ Copyright 2016-present Open Networking Laboratory
+ ~
+ ~ 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.
+ -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+
+ <parent>
+ <artifactId>onos-app-bmv2-demo</artifactId>
+ <groupId>org.onosproject</groupId>
+ <version>1.7.0-SNAPSHOT</version>
+ <relativePath>../pom.xml</relativePath>
+ </parent>
+
+ <artifactId>onos-app-bmv2-demo-common</artifactId>
+
+ <packaging>bundle</packaging>
+
+ <dependencies>
+ <dependency>
+ <groupId>org.onosproject</groupId>
+ <artifactId>onos-bmv2-protocol-api</artifactId>
+ <version>${project.version}</version>
+ </dependency>
+ </dependencies>
+</project>
\ No newline at end of file
diff --git a/apps/bmv2-demo/common/src/main/java/org/onosproject/bmv2/demo/app/common/AbstractUpgradableFabricApp.java b/apps/bmv2-demo/common/src/main/java/org/onosproject/bmv2/demo/app/common/AbstractUpgradableFabricApp.java
new file mode 100644
index 0000000..db37d82
--- /dev/null
+++ b/apps/bmv2-demo/common/src/main/java/org/onosproject/bmv2/demo/app/common/AbstractUpgradableFabricApp.java
@@ -0,0 +1,572 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.bmv2.demo.app.common;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
+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.onosproject.app.ApplicationAdminService;
+import org.onosproject.bmv2.api.context.Bmv2DeviceContext;
+import org.onosproject.bmv2.api.service.Bmv2DeviceContextService;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Host;
+import org.onosproject.net.Port;
+import org.onosproject.net.device.DeviceEvent;
+import org.onosproject.net.device.DeviceListener;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.flow.DefaultFlowRule;
+import org.onosproject.net.flow.FlowRule;
+import org.onosproject.net.flow.FlowRuleOperations;
+import org.onosproject.net.flow.FlowRuleService;
+import org.onosproject.net.host.HostEvent;
+import org.onosproject.net.host.HostListener;
+import org.onosproject.net.host.HostService;
+import org.onosproject.net.topology.Topology;
+import org.onosproject.net.topology.TopologyEvent;
+import org.onosproject.net.topology.TopologyGraph;
+import org.onosproject.net.topology.TopologyListener;
+import org.onosproject.net.topology.TopologyService;
+import org.onosproject.net.topology.TopologyVertex;
+import org.slf4j.Logger;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static java.util.stream.Collectors.toSet;
+import static java.util.stream.Stream.concat;
+import static org.onlab.util.Tools.groupedThreads;
+import static org.onosproject.net.device.DeviceEvent.Type.*;
+import static org.onosproject.net.host.HostEvent.Type.HOST_ADDED;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Abstract implementation of an app providing fabric connectivity for a 2-stage Clos topology of BMv2 devices.
+ */
+@Component(immediate = true)
+public abstract class AbstractUpgradableFabricApp {
+
+ private static final Map<String, AbstractUpgradableFabricApp> APP_HANDLES = Maps.newConcurrentMap();
+
+ private static final int NUM_LEAFS = 3;
+ private static final int NUM_SPINES = 3;
+ private static final int FLOW_PRIORITY = 100;
+
+ private static final int CLEANUP_SLEEP = 1000;
+
+ protected final Logger log = getLogger(getClass());
+
+ private final TopologyListener topologyListener = new InternalTopologyListener();
+ private final DeviceListener deviceListener = new InternalDeviceListener();
+ private final HostListener hostListener = new InternalHostListener();
+
+ private final ExecutorService executorService = Executors
+ .newFixedThreadPool(8, groupedThreads("onos/bmv2-demo-app", "bmv2-app-task", log));
+
+ private final String appName;
+ private final String configurationName;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected TopologyService topologyService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected DeviceService deviceService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ private HostService hostService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ private FlowRuleService flowRuleService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ private ApplicationAdminService appService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ private CoreService coreService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ private Bmv2DeviceContextService bmv2ContextService;
+
+ private boolean appActive = false;
+ private boolean appFreezed = false;
+
+ private boolean otherAppFound = false;
+ private AbstractUpgradableFabricApp otherApp;
+
+ private boolean flowRuleGenerated = false;
+ private ApplicationId appId;
+
+ private Bmv2DeviceContext bmv2Context;
+
+ private Set<DeviceId> leafSwitches;
+ private Set<DeviceId> spineSwitches;
+
+ private Map<DeviceId, List<FlowRule>> deviceFlowRules;
+ private Map<DeviceId, Boolean> rulesInstalled;
+
+ /**
+ * Creates a new Bmv2 Fabric Component.
+ *
+ * @param appName app name
+ * @param configurationName a common name for the P4 program / BMv2 configuration used by this app
+ * @param context a BMv2 device context to be used on devices
+ */
+ protected AbstractUpgradableFabricApp(String appName, String configurationName, Bmv2DeviceContext context) {
+ this.appName = checkNotNull(appName);
+ this.configurationName = checkNotNull(configurationName);
+ this.bmv2Context = checkNotNull(context);
+ }
+
+ @Activate
+ public void activate() {
+ log.info("Starting...");
+
+ appActive = true;
+ appFreezed = false;
+
+ if (APP_HANDLES.size() > 0) {
+ if (APP_HANDLES.size() > 1) {
+ throw new IllegalStateException("Found more than 1 active app handles");
+ }
+ otherAppFound = true;
+ otherApp = APP_HANDLES.values().iterator().next();
+ log.info("Found other fabric app active, signaling to freeze to {}...", otherApp.appName);
+ otherApp.setAppFreezed(true);
+ }
+
+ APP_HANDLES.put(appName, this);
+
+ appId = coreService.registerApplication(appName);
+
+ topologyService.addListener(topologyListener);
+ deviceService.addListener(deviceListener);
+ hostService.addListener(hostListener);
+
+ bmv2ContextService.registerInterpreterClassLoader(bmv2Context.interpreter().getClass(),
+ this.getClass().getClassLoader());
+
+ init();
+
+ log.info("STARTED", appId.id());
+ }
+
+ @Deactivate
+ public void deactivate() {
+ log.info("Stopping...");
+ try {
+ executorService.shutdown();
+ executorService.awaitTermination(5, TimeUnit.SECONDS);
+ } catch (InterruptedException e) {
+ List<Runnable> runningTasks = executorService.shutdownNow();
+ log.warn("Unable to stop the following tasks: {}", runningTasks);
+ }
+ deviceService.removeListener(deviceListener);
+ topologyService.removeListener(topologyListener);
+ hostService.removeListener(hostListener);
+ flowRuleService.removeFlowRulesById(appId);
+
+ appActive = false;
+ APP_HANDLES.remove(appName);
+
+ log.info("STOPPED");
+ }
+
+ private void init() {
+
+ // Reset any previous state
+ synchronized (this) {
+ flowRuleGenerated = Boolean.FALSE;
+ leafSwitches = Sets.newHashSet();
+ spineSwitches = Sets.newHashSet();
+ deviceFlowRules = Maps.newConcurrentMap();
+ rulesInstalled = Maps.newConcurrentMap();
+ }
+
+ // Start flow rules generator...
+ spawnTask(() -> generateFlowRules(topologyService.currentTopology(), Sets.newHashSet(hostService.getHosts())));
+ }
+
+ private void setAppFreezed(boolean appFreezed) {
+ this.appFreezed = appFreezed;
+ if (appFreezed) {
+ log.info("Freezing...");
+ } else {
+ log.info("Unfreezing...!");
+ }
+ }
+
+ /**
+ * Perform device initialization. Returns true if the operation was successful, false otherwise.
+ *
+ * @param deviceId a device id
+ * @return a boolean value
+ */
+ public abstract boolean initDevice(DeviceId deviceId);
+
+ /**
+ * Generates a list of flow rules for the given leaf switch, source host, destination hosts, spine switches and
+ * topology.
+ *
+ * @param leaf a leaf device id
+ * @param srcHost a source host
+ * @param dstHosts a collection of destination hosts
+ * @param spines a collection of spine device IDs
+ * @param topology a topology
+ * @return a list of flow rules
+ * @throws FlowRuleGeneratorException if flow rules cannot be generated
+ */
+ public abstract List<FlowRule> generateLeafRules(DeviceId leaf, Host srcHost, Collection<Host> dstHosts,
+ Collection<DeviceId> spines, Topology topology)
+ throws FlowRuleGeneratorException;
+
+ /**
+ * Generates a list of flow rules for the given spine switch, destination hosts and topology.
+ *
+ * @param deviceId a spine device id
+ * @param dstHosts a collection of destination hosts
+ * @param topology a topology
+ * @return a list of flow rules
+ * @throws FlowRuleGeneratorException if flow rules cannot be generated
+ */
+ public abstract List<FlowRule> generateSpineRules(DeviceId deviceId, Collection<Host> dstHosts, Topology topology)
+ throws FlowRuleGeneratorException;
+
+ private void deployRoutine() {
+ if (otherAppFound && otherApp.appActive) {
+ log.info("Starting update routine...");
+ updateRoutine();
+ appService.deactivate(otherApp.appId);
+ } else {
+ Stream.concat(leafSwitches.stream(), spineSwitches.stream())
+ .map(deviceService::getDevice)
+ .forEach(device -> spawnTask(() -> deployDevice(device)));
+ }
+ }
+
+ private void updateRoutine() {
+ Stream.concat(leafSwitches.stream(), spineSwitches.stream())
+ .forEach(did -> spawnTask(() -> {
+ cleanUpDevice(did);
+ try {
+ Thread.sleep(CLEANUP_SLEEP);
+ } catch (InterruptedException e) {
+ log.warn("Cleanup sleep interrupted!");
+ Thread.interrupted();
+ }
+ deployDevice(deviceService.getDevice(did));
+ }));
+ }
+
+ private void cleanUpDevice(DeviceId deviceId) {
+ List<FlowRule> flowRulesToRemove = Lists.newArrayList();
+ flowRuleService.getFlowEntries(deviceId).forEach(fe -> {
+ if (fe.appId() == otherApp.appId.id()) {
+ flowRulesToRemove.add(fe);
+ }
+ });
+ if (flowRulesToRemove.size() > 0) {
+ log.info("Cleaning {} old flow rules from {}...", flowRulesToRemove.size(), deviceId);
+ removeFlowRules(flowRulesToRemove);
+ }
+ }
+
+ /**
+ * Executes a device deploy.
+ *
+ * @param device a device
+ */
+ public void deployDevice(Device device) {
+ // Serialize executions per device ID using a concurrent map.
+ rulesInstalled.compute(device.id(), (did, deployed) -> {
+ Bmv2DeviceContext deviceContext = bmv2ContextService.getContext(device.id());
+ if (deviceContext == null) {
+ log.error("Unable to get context for device {}", device.id());
+ return deployed;
+ } else if (!deviceContext.equals(bmv2Context)) {
+ log.info("Swapping configuration to {} on device {}...", configurationName, device.id());
+ bmv2ContextService.triggerConfigurationSwap(device.id(), bmv2Context);
+ return deployed;
+ }
+
+ List<FlowRule> rules = deviceFlowRules.get(device.id());
+ if (initDevice(device.id())) {
+ if (deployed == null && rules != null && rules.size() > 0) {
+ log.info("Installing rules for {}...", did);
+ installFlowRules(rules);
+ return true;
+ }
+ } else {
+ log.warn("Filed to initialize device {}", device.id());
+ if (deployed != null && rules != null && rules.size() > 0) {
+ log.info("Removing rules for {}...", did);
+ removeFlowRules(rules);
+ return null;
+ }
+ }
+
+ return deployed;
+ });
+ }
+
+ private void spawnTask(Runnable task) {
+ executorService.execute(task);
+ }
+
+
+ private void installFlowRules(Collection<FlowRule> rules) {
+ FlowRuleOperations.Builder opsBuilder = FlowRuleOperations.builder();
+ rules.forEach(opsBuilder::add);
+ flowRuleService.apply(opsBuilder.build());
+ }
+
+ private void removeFlowRules(Collection<FlowRule> rules) {
+ FlowRuleOperations.Builder opsBuilder = FlowRuleOperations.builder();
+ rules.forEach(opsBuilder::remove);
+ flowRuleService.apply(opsBuilder.build());
+ }
+
+ /**
+ * Generates the flow rules to provide host-to-host connectivity for the given topology and hosts.
+ *
+ * @param topo a topology
+ * @param hosts a collection of hosts
+ */
+ private synchronized void generateFlowRules(Topology topo, Collection<Host> hosts) {
+
+ if (flowRuleGenerated) {
+ log.debug("Flow rules have been already generated, aborting...");
+ return;
+ }
+
+ log.debug("Starting flow rules generator...");
+
+ TopologyGraph graph = topologyService.getGraph(topo);
+ Set<DeviceId> spines = Sets.newHashSet();
+ Set<DeviceId> leafs = Sets.newHashSet();
+ graph.getVertexes().stream()
+ .map(TopologyVertex::deviceId)
+ .forEach(did -> (isSpine(did, topo) ? spines : leafs).add(did));
+
+ if (spines.size() != NUM_SPINES || leafs.size() != NUM_LEAFS) {
+ log.info("Invalid leaf/spine switches count, aborting... > leafCount={}, spineCount={}",
+ spines.size(), leafs.size());
+ return;
+ }
+
+ for (DeviceId did : spines) {
+ int portCount = deviceService.getPorts(did).size();
+ // Expected port count: num leafs + 1 redundant leaf link
+ if (portCount != (NUM_LEAFS + 1)) {
+ log.info("Invalid port count for spine, aborting... > deviceId={}, portCount={}", did, portCount);
+ return;
+ }
+ }
+ for (DeviceId did : leafs) {
+ int portCount = deviceService.getPorts(did).size();
+ // Expected port count: num spines + host port + 1 redundant spine link
+ if (portCount != (NUM_SPINES + 2)) {
+ log.info("Invalid port count for leaf, aborting... > deviceId={}, portCount={}", did, portCount);
+ return;
+ }
+ }
+
+ // Check hosts, number and exactly one per leaf
+ Map<DeviceId, Host> hostMap = Maps.newHashMap();
+ hosts.forEach(h -> hostMap.put(h.location().deviceId(), h));
+ if (hosts.size() != NUM_LEAFS || !leafs.equals(hostMap.keySet())) {
+ log.info("Wrong host configuration, aborting... > hostCount={}, hostMapz={}", hosts.size(), hostMap);
+ return;
+ }
+
+ List<FlowRule> newFlowRules = Lists.newArrayList();
+
+ try {
+ for (DeviceId deviceId : leafs) {
+ Host srcHost = hostMap.get(deviceId);
+ Set<Host> dstHosts = hosts.stream().filter(h -> h != srcHost).collect(toSet());
+ newFlowRules.addAll(generateLeafRules(deviceId, srcHost, dstHosts, spines, topo));
+ }
+ for (DeviceId deviceId : spines) {
+ newFlowRules.addAll(generateSpineRules(deviceId, hosts, topo));
+ }
+ } catch (FlowRuleGeneratorException e) {
+ log.warn("Exception while executing flow rule generator: ", e.toString());
+ return;
+ }
+
+ if (newFlowRules.size() == 0) {
+ // Something went wrong
+ log.error("0 flow rules generated, BUG?");
+ return;
+ }
+
+ // All good!
+ // Divide flow rules per device id...
+ ImmutableMap.Builder<DeviceId, List<FlowRule>> mapBuilder = ImmutableMap.builder();
+ concat(spines.stream(), leafs.stream())
+ .map(deviceId -> ImmutableList.copyOf(newFlowRules
+ .stream()
+ .filter(fr -> fr.deviceId().equals(deviceId))
+ .iterator()))
+ .forEach(frs -> mapBuilder.put(frs.get(0).deviceId(), frs));
+ this.deviceFlowRules = mapBuilder.build();
+
+ this.leafSwitches = ImmutableSet.copyOf(leafs);
+ this.spineSwitches = ImmutableSet.copyOf(spines);
+
+ // Avoid other executions to modify the generated flow rules.
+ flowRuleGenerated = true;
+
+ log.info("DONE! Generated {} flow rules for {} devices...", newFlowRules.size(), spines.size() + leafs.size());
+
+ // Deploy configuration.
+ spawnTask(this::deployRoutine);
+ }
+
+ /**
+ * Returns a new, pre-configured flow rule builder.
+ *
+ * @param did a device id
+ * @param tableName a table name
+ * @return a new flow rule builder
+ */
+ protected FlowRule.Builder flowRuleBuilder(DeviceId did, String tableName) throws FlowRuleGeneratorException {
+ Map<String, Integer> tableMap = bmv2Context.interpreter().tableIdMap().inverse();
+ if (tableMap.get(tableName) == null) {
+ throw new FlowRuleGeneratorException("Unknown table " + tableName);
+ }
+ return DefaultFlowRule.builder()
+ .forDevice(did)
+ .forTable(tableMap.get(tableName))
+ .fromApp(appId)
+ .withPriority(FLOW_PRIORITY)
+ .makePermanent();
+ }
+
+ private List<Port> getHostPorts(DeviceId deviceId, Topology topology) {
+ // Get all non-fabric ports.
+ return deviceService
+ .getPorts(deviceId)
+ .stream()
+ .filter(p -> !isFabricPort(p, topology))
+ .collect(Collectors.toList());
+ }
+
+ private boolean isSpine(DeviceId deviceId, Topology topology) {
+ // True if all ports are fabric.
+ return getHostPorts(deviceId, topology).size() == 0;
+ }
+
+ protected boolean isFabricPort(Port port, Topology topology) {
+ // True if the port connects this device to another infrastructure device.
+ return topologyService.isInfrastructure(topology, new ConnectPoint(port.element().id(), port.number()));
+ }
+
+ /**
+ * A listener of topology events that executes a flow rule generation task each time a device is added.
+ */
+ private class InternalTopologyListener implements TopologyListener {
+
+ @Override
+ public void event(TopologyEvent event) {
+ spawnTask(() -> generateFlowRules(event.subject(), Sets.newHashSet(hostService.getHosts())));
+ }
+
+ @Override
+ public boolean isRelevant(TopologyEvent event) {
+ return !appFreezed &&
+ // If at least one reason is of type DEVICE_ADDED.
+ event.reasons().stream().
+ filter(r -> r instanceof DeviceEvent)
+ .filter(r -> ((DeviceEvent) r).type() == DEVICE_ADDED)
+ .findAny()
+ .isPresent();
+ }
+ }
+
+ /**
+ * A listener of device events that executes a device deploy task each time a device is added, updated or
+ * re-connects.
+ */
+ private class InternalDeviceListener implements DeviceListener {
+ @Override
+ public void event(DeviceEvent event) {
+ spawnTask(() -> deployDevice(event.subject()));
+ }
+
+ @Override
+ public boolean isRelevant(DeviceEvent event) {
+ return !appFreezed &&
+ (event.type() == DEVICE_ADDED ||
+ event.type() == DEVICE_UPDATED ||
+ (event.type() == DEVICE_AVAILABILITY_CHANGED &&
+ deviceService.isAvailable(event.subject().id())));
+ }
+ }
+
+ /**
+ * A listener of host events that generates flow rules each time a new host is added.
+ */
+ private class InternalHostListener implements HostListener {
+ @Override
+ public void event(HostEvent event) {
+ spawnTask(() -> generateFlowRules(topologyService.currentTopology(),
+ Sets.newHashSet(hostService.getHosts())));
+ }
+
+ @Override
+ public boolean isRelevant(HostEvent event) {
+ return !appFreezed && event.type() == HOST_ADDED;
+ }
+ }
+
+ /**
+ * An exception occurred while generating flow rules for this fabric.
+ */
+ public class FlowRuleGeneratorException extends Exception {
+
+ public FlowRuleGeneratorException() {
+ }
+
+ public FlowRuleGeneratorException(String msg) {
+ super(msg);
+ }
+
+ public FlowRuleGeneratorException(Exception cause) {
+ super(cause);
+ }
+ }
+}
\ No newline at end of file
diff --git a/apps/bmv2-demo/common/src/main/java/org/onosproject/bmv2/demo/app/common/package-info.java b/apps/bmv2-demo/common/src/main/java/org/onosproject/bmv2/demo/app/common/package-info.java
new file mode 100644
index 0000000..b8eab5c
--- /dev/null
+++ b/apps/bmv2-demo/common/src/main/java/org/onosproject/bmv2/demo/app/common/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.
+ */
+
+/**
+ * Bmv2 demo app common classes.
+ */
+package org.onosproject.bmv2.demo.app.common;
\ No newline at end of file