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/*
* 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.net.newresource.impl;
import org.onlab.packet.MplsLabel;
import org.onlab.packet.VlanId;
import org.onlab.util.ItemNotFoundException;
import org.onosproject.net.ConnectPoint;
import org.onosproject.net.Link;
import org.onosproject.net.LinkKey;
import org.onosproject.net.behaviour.MplsQuery;
import org.onosproject.net.behaviour.VlanQuery;
import org.onosproject.net.driver.DriverHandler;
import org.onosproject.net.driver.DriverService;
import org.onosproject.net.link.LinkEvent;
import org.onosproject.net.link.LinkListener;
import org.onosproject.net.newresource.ResourceAdminService;
import org.onosproject.net.newresource.ResourcePath;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* An implementation of LinkListener registering links as resources.
*/
final class ResourceLinkListener implements LinkListener {
private static final int TOTAL_VLANS = 1024;
private static final List<VlanId> ENTIRE_VLAN_IDS = getEntireVlans();
private static final int TOTAL_MPLS_LABELS = 1048576;
private static final List<MplsLabel> ENTIRE_MPLS_LABELS = getEntireMplsLabels();
private final ResourceAdminService adminService;
private final DriverService driverService;
private final ExecutorService executor;
/**
* Creates an instance with the specified ResourceAdminService and ExecutorService.
*
* @param adminService instance invoked to register resources
* @param driverService driver service instance
* @param executor executor used for processing resource registration
*/
ResourceLinkListener(ResourceAdminService adminService, DriverService driverService, ExecutorService executor) {
this.adminService = checkNotNull(adminService);
this.driverService = checkNotNull(driverService);
this.executor = checkNotNull(executor);
}
@Override
public void event(LinkEvent event) {
Link link = event.subject();
switch (event.type()) {
case LINK_ADDED:
registerLinkResource(link);
break;
case LINK_REMOVED:
unregisterLinkResource(link);
break;
default:
break;
}
}
private void registerLinkResource(Link link) {
executor.submit(() -> {
// register the link
LinkKey linkKey = LinkKey.linkKey(link);
adminService.registerResources(ResourcePath.ROOT, linkKey);
ResourcePath linkPath = ResourcePath.discrete(linkKey);
// register VLAN IDs against the link
if (isEnabled(link, this::isVlanEnabled)) {
adminService.registerResources(linkPath, ENTIRE_VLAN_IDS);
}
// register MPLS labels against the link
if (isEnabled(link, this::isMplsEnabled)) {
adminService.registerResources(linkPath, ENTIRE_MPLS_LABELS);
}
});
}
private void unregisterLinkResource(Link link) {
LinkKey linkKey = LinkKey.linkKey(link);
executor.submit(() -> adminService.unregisterResources(ResourcePath.ROOT, linkKey));
}
private boolean isEnabled(Link link, Predicate<ConnectPoint> predicate) {
return predicate.test(link.src()) && predicate.test(link.dst());
}
private boolean isVlanEnabled(ConnectPoint cp) {
try {
DriverHandler handler = driverService.createHandler(cp.deviceId());
if (handler == null) {
return false;
}
VlanQuery query = handler.behaviour(VlanQuery.class);
return query != null && query.isEnabled(cp.port());
} catch (ItemNotFoundException e) {
return false;
}
}
private boolean isMplsEnabled(ConnectPoint cp) {
try {
DriverHandler handler = driverService.createHandler(cp.deviceId());
if (handler == null) {
return false;
}
MplsQuery query = handler.behaviour(MplsQuery.class);
return query != null && query.isEnabled(cp.port());
} catch (ItemNotFoundException e) {
return false;
}
}
private static List<VlanId> getEntireVlans() {
return IntStream.range(0, TOTAL_VLANS)
.mapToObj(x -> VlanId.vlanId((short) x))
.collect(Collectors.toList());
}
private static List<MplsLabel> getEntireMplsLabels() {
// potentially many objects are created
return IntStream.range(0, TOTAL_MPLS_LABELS)
.mapToObj(MplsLabel::mplsLabel)
.collect(Collectors.toList());
}
}
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