[Falcon] More flexible component choice for routing apps

Change-Id: I0b01f633332fa7f099d4b3ffe58d86141f3a040b
diff --git a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/BgpRouter.java b/apps/bgprouter/src/main/java/org/onosproject/bgprouter/BgpRouter.java
index 8acf9a7..d4998fe 100644
--- a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/BgpRouter.java
+++ b/apps/bgprouter/src/main/java/org/onosproject/bgprouter/BgpRouter.java
@@ -22,6 +22,7 @@
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
+import org.onosproject.incubator.component.ComponentService;
 import org.onosproject.incubator.net.intf.InterfaceService;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.config.NetworkConfigService;
@@ -36,6 +37,8 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Optional;
 
 /**
@@ -72,6 +75,9 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected DeviceService deviceService;
 
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected ComponentService componentService;
+
     private ApplicationId appId;
 
     // Device id of control-plane switch (OVS) connected to BGP Speaker - should be
@@ -85,10 +91,19 @@
     private DeviceListener deviceListener;
     private IcmpHandler icmpHandler;
 
+    private static List<String> components = new ArrayList<>();
+    static {
+        components.add("org.onosproject.routing.bgp.BgpSessionManager");
+        components.add("org.onosproject.routing.impl.Router");
+        components.add("org.onosproject.routing.impl.SingleSwitchFibInstaller");
+    }
+
     @Activate
     protected void activate() {
         appId = coreService.registerApplication(BGP_ROUTER_APP);
 
+        components.forEach(name -> componentService.activate(appId, name));
+
         ApplicationId routerAppId = coreService.getAppId(RoutingService.ROUTER_APP_ID);
         BgpConfig bgpConfig =
                 networkConfigService.getConfig(routerAppId, RoutingService.CONFIG_CLASS);
@@ -123,6 +138,8 @@
 
     @Deactivate
     protected void deactivate() {
+        components.forEach(name -> componentService.deactivate(appId, name));
+
         connectivityManager.stop();
         icmpHandler.stop();
         deviceService.removeListener(deviceListener);
diff --git a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/NextHop.java b/apps/bgprouter/src/main/java/org/onosproject/bgprouter/NextHop.java
deleted file mode 100644
index 88ce1a3..0000000
--- a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/NextHop.java
+++ /dev/null
@@ -1,100 +0,0 @@
-/*
- * Copyright 2015 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.bgprouter;
-
-import java.util.Objects;
-
-import org.onlab.packet.IpAddress;
-import org.onlab.packet.MacAddress;
-
-import com.google.common.base.MoreObjects;
-
-/**
- * Represents a next hop for routing, whose MAC address has already been resolved.
- */
-public class NextHop {
-
-    private final IpAddress ip;
-    private final MacAddress mac;
-    private final NextHopGroupKey group;
-
-    /**
-     * Creates a new next hop.
-     *
-     * @param ip next hop's IP address
-     * @param mac next hop's MAC address
-     * @param group next hop's group
-     */
-    public NextHop(IpAddress ip, MacAddress mac, NextHopGroupKey group) {
-        this.ip = ip;
-        this.mac = mac;
-        this.group = group;
-    }
-
-    /**
-     * Returns the next hop's IP address.
-     *
-     * @return next hop's IP address
-     */
-    public IpAddress ip() {
-        return ip;
-    }
-
-    /**
-     * Returns the next hop's MAC address.
-     *
-     * @return next hop's MAC address
-     */
-    public MacAddress mac() {
-        return mac;
-    }
-
-    /**
-     * Returns the next hop group.
-     *
-     * @return group
-     */
-    public NextHopGroupKey group() {
-        return group;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (!(o instanceof NextHop)) {
-            return false;
-        }
-
-        NextHop that = (NextHop) o;
-
-        return Objects.equals(this.ip, that.ip) &&
-                Objects.equals(this.mac, that.mac) &&
-                Objects.equals(this.group, that.group);
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(ip, mac, group);
-    }
-
-    @Override
-    public String toString() {
-        return MoreObjects.toStringHelper(getClass())
-                .add("ip", ip)
-                .add("mac", mac)
-                .add("group", group)
-                .toString();
-    }
-}
diff --git a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/NextHopGroupKey.java b/apps/bgprouter/src/main/java/org/onosproject/bgprouter/NextHopGroupKey.java
deleted file mode 100644
index cd4c4e9..0000000
--- a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/NextHopGroupKey.java
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * Copyright 2015 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.bgprouter;
-
-import static com.google.common.base.Preconditions.checkNotNull;
-
-import java.util.Objects;
-
-import org.onlab.packet.IpAddress;
-
-import com.google.common.base.MoreObjects;
-
-/**
- * Identifier for a next hop group.
- */
-public class NextHopGroupKey {
-
-    private final IpAddress address;
-
-    /**
-     * Creates a new next hop group key.
-     *
-     * @param address next hop's IP address
-     */
-    public NextHopGroupKey(IpAddress address) {
-        this.address = checkNotNull(address);
-    }
-
-    /**
-     * Returns the next hop's IP address.
-     *
-     * @return next hop's IP address
-     */
-    public IpAddress address() {
-        return address;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (!(o instanceof NextHopGroupKey)) {
-            return false;
-        }
-
-        NextHopGroupKey that = (NextHopGroupKey) o;
-
-        return Objects.equals(this.address, that.address);
-    }
-
-    @Override
-    public int hashCode() {
-        return address.hashCode();
-    }
-
-    @Override
-    public String toString() {
-        return MoreObjects.toStringHelper(getClass())
-                .add("address", address)
-                .toString();
-    }
-}
diff --git a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/SingleSwitchRouter.java b/apps/bgprouter/src/main/java/org/onosproject/bgprouter/SingleSwitchRouter.java
deleted file mode 100644
index 364d1b4..0000000
--- a/apps/bgprouter/src/main/java/org/onosproject/bgprouter/SingleSwitchRouter.java
+++ /dev/null
@@ -1,411 +0,0 @@
-/*
- * Copyright 2015 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.bgprouter;
-
-import com.google.common.collect.ConcurrentHashMultiset;
-import com.google.common.collect.HashMultimap;
-import com.google.common.collect.Maps;
-import com.google.common.collect.Multimap;
-import com.google.common.collect.Multiset;
-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.onlab.packet.Ethernet;
-import org.onlab.packet.IpAddress;
-import org.onlab.packet.IpPrefix;
-import org.onosproject.core.ApplicationId;
-import org.onosproject.core.CoreService;
-import org.onosproject.incubator.net.intf.Interface;
-import org.onosproject.incubator.net.intf.InterfaceService;
-import org.onosproject.net.DeviceId;
-import org.onosproject.net.config.NetworkConfigService;
-import org.onosproject.net.device.DeviceEvent;
-import org.onosproject.net.device.DeviceListener;
-import org.onosproject.net.device.DeviceService;
-import org.onosproject.net.flow.DefaultTrafficSelector;
-import org.onosproject.net.flow.DefaultTrafficTreatment;
-import org.onosproject.net.flow.TrafficSelector;
-import org.onosproject.net.flow.TrafficTreatment;
-import org.onosproject.net.flow.criteria.Criteria;
-import org.onosproject.net.flowobjective.DefaultFilteringObjective;
-import org.onosproject.net.flowobjective.DefaultForwardingObjective;
-import org.onosproject.net.flowobjective.DefaultNextObjective;
-import org.onosproject.net.flowobjective.FilteringObjective;
-import org.onosproject.net.flowobjective.FlowObjectiveService;
-import org.onosproject.net.flowobjective.ForwardingObjective;
-import org.onosproject.net.flowobjective.NextObjective;
-import org.onosproject.net.flowobjective.Objective;
-import org.onosproject.net.flowobjective.ObjectiveContext;
-import org.onosproject.net.flowobjective.ObjectiveError;
-import org.onosproject.routing.FibEntry;
-import org.onosproject.routing.FibListener;
-import org.onosproject.routing.FibUpdate;
-import org.onosproject.routing.RoutingService;
-import org.onosproject.routing.config.BgpConfig;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Optional;
-import java.util.Set;
-
-/**
- * Programs routes to a single OpenFlow switch.
- */
-@Component(immediate = true)
-public class SingleSwitchRouter {
-
-    private final Logger log = LoggerFactory.getLogger(getClass());
-
-    private static final int PRIORITY_OFFSET = 100;
-    private static final int PRIORITY_MULTIPLIER = 5;
-
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected CoreService coreService;
-
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected RoutingService routingService;
-
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected InterfaceService interfaceService;
-
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected NetworkConfigService networkConfigService;
-
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected FlowObjectiveService flowObjectiveService;
-
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected DeviceService deviceService;
-
-    private InnerDeviceListener deviceListener;
-
-    // Device id of data-plane switch - should be learned from config
-    private DeviceId deviceId;
-
-    private ApplicationId appId;
-
-    // Reference count for how many times a next hop is used by a route
-    private final Multiset<IpAddress> nextHopsCount = ConcurrentHashMultiset.create();
-
-    // Mapping from prefix to its current next hop
-    private final Map<IpPrefix, IpAddress> prefixToNextHop = Maps.newHashMap();
-
-    // Mapping from next hop IP to next hop object containing group info
-    private final Map<IpAddress, Integer> nextHops = Maps.newHashMap();
-
-    // Stores FIB updates that are waiting for groups to be set up
-    private final Multimap<NextHopGroupKey, FibEntry> pendingUpdates = HashMultimap.create();
-
-
-    @Activate
-    protected void activate() {
-        ApplicationId routerAppId = coreService.getAppId(RoutingService.ROUTER_APP_ID);
-        BgpConfig bgpConfig =
-                networkConfigService.getConfig(routerAppId, RoutingService.CONFIG_CLASS);
-
-        if (bgpConfig == null) {
-            log.error("No BgpConfig found");
-            return;
-        }
-
-        getDeviceConfiguration(bgpConfig);
-
-        appId = coreService.getAppId(BgpRouter.BGP_ROUTER_APP);
-
-        deviceListener = new InnerDeviceListener();
-        deviceService.addListener(deviceListener);
-
-        routingService.addFibListener(new InternalFibListener());
-        routingService.start();
-
-        // Initialize devices now if they are already connected
-        if (deviceService.isAvailable(deviceId)) {
-            processIntfFilters(true, interfaceService.getInterfaces());
-        }
-
-        log.info("Started");
-    }
-
-    @Deactivate
-    protected void deactivate() {
-        routingService.stop();
-
-        deviceService.removeListener(deviceListener);
-
-        //processIntfFilters(false, configService.getInterfaces()); //TODO necessary?
-
-        log.info("Stopped");
-    }
-
-    private void getDeviceConfiguration(BgpConfig bgpConfig) {
-        Optional<BgpConfig.BgpSpeakerConfig> bgpSpeaker =
-                bgpConfig.bgpSpeakers().stream().findAny();
-
-        if (!bgpSpeaker.isPresent()) {
-            log.error("BGP speaker configuration not found");
-            return;
-        }
-
-        Optional<IpAddress> peerAddress =
-                bgpSpeaker.get().peers().stream().findAny();
-
-        if (!peerAddress.isPresent()) {
-            log.error("BGP speaker must have peers configured");
-            return;
-        }
-
-        Interface intf = interfaceService.getMatchingInterface(peerAddress.get());
-
-        if (intf == null) {
-            log.error("No interface found for peer");
-            return;
-        }
-
-        // Assume all peers are configured on the same device - this is required
-        // by the BGP router
-        deviceId = intf.connectPoint().deviceId();
-
-        log.info("Router dpid: {}", deviceId);
-    }
-
-    private void updateFibEntry(Collection<FibUpdate> updates) {
-        Map<FibEntry, Integer> toInstall = new HashMap<>(updates.size());
-
-        for (FibUpdate update : updates) {
-            FibEntry entry = update.entry();
-
-            addNextHop(entry);
-
-            Integer nextId;
-            synchronized (pendingUpdates) {
-                nextId = nextHops.get(entry.nextHopIp());
-            }
-
-            toInstall.put(update.entry(), nextId);
-        }
-
-        installFlows(toInstall);
-    }
-
-    private void installFlows(Map<FibEntry, Integer> entriesToInstall) {
-
-        for (Map.Entry<FibEntry, Integer> entry : entriesToInstall.entrySet()) {
-            FibEntry fibEntry = entry.getKey();
-            Integer nextId = entry.getValue();
-
-            flowObjectiveService.forward(deviceId,
-                    generateRibForwardingObj(fibEntry.prefix(), nextId).add());
-            log.trace("Sending forwarding objective {} -> nextId:{}", fibEntry, nextId);
-        }
-
-    }
-
-    private synchronized void deleteFibEntry(Collection<FibUpdate> withdraws) {
-
-        for (FibUpdate update : withdraws) {
-            FibEntry entry = update.entry();
-            //Integer nextId = nextHops.get(entry.nextHopIp());
-
-           /* Group group = deleteNextHop(entry.prefix());
-            if (group == null) {
-                log.warn("Group not found when deleting {}", entry);
-                return;
-            }*/
-
-            flowObjectiveService.forward(deviceId,
-                    generateRibForwardingObj(entry.prefix(), null).remove());
-
-        }
-
-    }
-
-    private ForwardingObjective.Builder generateRibForwardingObj(IpPrefix prefix,
-                                                                 Integer nextId) {
-        TrafficSelector selector = DefaultTrafficSelector.builder()
-                .matchEthType(Ethernet.TYPE_IPV4)
-                .matchIPDst(prefix)
-                .build();
-
-        int priority = prefix.prefixLength() * PRIORITY_MULTIPLIER + PRIORITY_OFFSET;
-
-        ForwardingObjective.Builder fwdBuilder = DefaultForwardingObjective.builder()
-                .fromApp(appId)
-                .makePermanent()
-                .withSelector(selector)
-                .withPriority(priority)
-                .withFlag(ForwardingObjective.Flag.SPECIFIC);
-
-        if (nextId == null) {
-            // Route withdraws are not specified with next hops. Generating
-            // dummy treatment as there is no equivalent nextId info.
-            fwdBuilder.withTreatment(DefaultTrafficTreatment.builder().build());
-        } else {
-            fwdBuilder.nextStep(nextId);
-        }
-        return fwdBuilder;
-    }
-
-    private synchronized void addNextHop(FibEntry entry) {
-        prefixToNextHop.put(entry.prefix(), entry.nextHopIp());
-        if (nextHopsCount.count(entry.nextHopIp()) == 0) {
-            // There was no next hop in the multiset
-
-            Interface egressIntf = interfaceService.getMatchingInterface(entry.nextHopIp());
-            if (egressIntf == null) {
-                log.warn("no egress interface found for {}", entry);
-                return;
-            }
-
-            NextHopGroupKey groupKey = new NextHopGroupKey(entry.nextHopIp());
-
-            NextHop nextHop = new NextHop(entry.nextHopIp(), entry.nextHopMac(), groupKey);
-
-            TrafficTreatment treatment = DefaultTrafficTreatment.builder()
-                    .setEthSrc(egressIntf.mac())
-                    .setEthDst(nextHop.mac())
-                    .pushVlan()
-                    .setVlanId(egressIntf.vlan())
-                    .setVlanPcp((byte) 0)
-                    .setOutput(egressIntf.connectPoint().port())
-                    .build();
-
-            int nextId = flowObjectiveService.allocateNextId();
-
-            NextObjective nextObjective = DefaultNextObjective.builder()
-                    .withId(nextId)
-                    .addTreatment(treatment)
-                    .withType(NextObjective.Type.SIMPLE)
-                    .fromApp(appId)
-                    .add(); // TODO add callbacks
-
-            flowObjectiveService.next(deviceId, nextObjective);
-
-            nextHops.put(nextHop.ip(), nextId);
-
-        }
-
-        nextHopsCount.add(entry.nextHopIp());
-    }
-
-    /*private synchronized Group deleteNextHop(IpPrefix prefix) {
-        IpAddress nextHopIp = prefixToNextHop.remove(prefix);
-        NextHop nextHop = nextHops.get(nextHopIp);
-        if (nextHop == null) {
-            log.warn("No next hop found when removing prefix {}", prefix);
-            return null;
-        }
-
-        Group group = groupService.getGroup(deviceId,
-                                            new DefaultGroupKey(appKryo.
-                                                                serialize(nextHop.group())));
-
-        // FIXME disabling group deletes for now until we verify the logic is OK
-        if (nextHopsCount.remove(nextHopIp, 1) <= 1) {
-            // There was one or less next hops, so there are now none
-
-            log.debug("removing group for next hop {}", nextHop);
-
-            nextHops.remove(nextHopIp);
-
-            groupService.removeGroup(deviceId,
-                                     new DefaultGroupKey(appKryo.build().serialize(nextHop.group())),
-                                     appId);
-        }
-
-        return group;
-    }*/
-
-    private void processIntfFilters(boolean install, Set<Interface> intfs) {
-        log.info("Processing {} router interfaces", intfs.size());
-        for (Interface intf : intfs) {
-            if (!intf.connectPoint().deviceId().equals(deviceId)) {
-                // Ignore interfaces if they are not on the router switch
-                continue;
-            }
-
-            FilteringObjective.Builder fob = DefaultFilteringObjective.builder();
-            fob.withKey(Criteria.matchInPort(intf.connectPoint().port()))
-                    .addCondition(Criteria.matchEthDst(intf.mac()))
-                    .addCondition(Criteria.matchVlanId(intf.vlan()));
-            intf.ipAddresses().stream()
-                    .forEach(ipaddr -> fob.addCondition(
-                            Criteria.matchIPDst(
-                                    IpPrefix.valueOf(ipaddr.ipAddress(), 32))));
-            fob.permit().fromApp(appId);
-            flowObjectiveService.filter(
-                    deviceId,
-                    fob.add(new ObjectiveContext() {
-                        @Override
-                        public void onSuccess(Objective objective) {
-                            log.info("Successfully installed interface based "
-                                    + "filtering objectives for intf {}", intf);
-                        }
-
-                        @Override
-                        public void onError(Objective objective,
-                                            ObjectiveError error) {
-                            log.error("Failed to install interface filters for intf {}: {}",
-                                    intf, error);
-                            // TODO something more than just logging
-                        }
-                    }));
-        }
-    }
-
-    private class InternalFibListener implements FibListener {
-
-        @Override
-        public void update(Collection<FibUpdate> updates,
-                           Collection<FibUpdate> withdraws) {
-            SingleSwitchRouter.this.deleteFibEntry(withdraws);
-            SingleSwitchRouter.this.updateFibEntry(updates);
-        }
-    }
-
-
-    // Triggers driver setup when a device is (re)detected.
-    private class InnerDeviceListener implements DeviceListener {
-        @Override
-        public void event(DeviceEvent event) {
-            switch (event.type()) {
-            case DEVICE_ADDED:
-            case DEVICE_AVAILABILITY_CHANGED:
-                if (deviceService.isAvailable(event.subject().id())) {
-                    log.info("Device connected {}", event.subject().id());
-                    if (event.subject().id().equals(deviceId)) {
-                        processIntfFilters(true, interfaceService.getInterfaces());
-                    }
-                }
-                break;
-            // TODO other cases
-            case DEVICE_UPDATED:
-            case DEVICE_REMOVED:
-            case DEVICE_SUSPENDED:
-            case PORT_ADDED:
-            case PORT_UPDATED:
-            case PORT_REMOVED:
-            default:
-                break;
-            }
-        }
-    }
-}