| /* |
| * Copyright 2014 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.intent.impl.compiler; |
| |
| 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.net.DefaultLink; |
| import org.onosproject.net.DefaultPath; |
| import org.onosproject.net.Host; |
| import org.onosproject.net.Link; |
| import org.onosproject.net.Path; |
| import org.onosproject.net.flow.TrafficSelector; |
| import org.onosproject.net.host.HostService; |
| import org.onosproject.net.intent.HostToHostIntent; |
| import org.onosproject.net.intent.Intent; |
| import org.onosproject.net.intent.PathIntent; |
| import org.onosproject.net.intent.constraint.AsymmetricPathConstraint; |
| import org.onosproject.net.resource.LinkResourceAllocations; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Set; |
| |
| import static org.onosproject.net.flow.DefaultTrafficSelector.builder; |
| |
| /** |
| * A intent compiler for {@link HostToHostIntent}. |
| */ |
| @Component(immediate = true) |
| public class HostToHostIntentCompiler |
| extends ConnectivityIntentCompiler<HostToHostIntent> { |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected HostService hostService; |
| |
| @Activate |
| public void activate() { |
| intentManager.registerCompiler(HostToHostIntent.class, this); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| intentManager.unregisterCompiler(HostToHostIntent.class); |
| } |
| |
| @Override |
| public List<Intent> compile(HostToHostIntent intent, List<Intent> installable, |
| Set<LinkResourceAllocations> resources) { |
| boolean isAsymmetric = intent.constraints().contains(new AsymmetricPathConstraint()); |
| Path pathOne = getPath(intent, intent.one(), intent.two()); |
| Path pathTwo = isAsymmetric ? |
| getPath(intent, intent.two(), intent.one()) : invertPath(pathOne); |
| |
| Host one = hostService.getHost(intent.one()); |
| Host two = hostService.getHost(intent.two()); |
| |
| return Arrays.asList(createPathIntent(pathOne, one, two, intent), |
| createPathIntent(pathTwo, two, one, intent)); |
| } |
| |
| // Inverts the specified path. This makes an assumption that each link in |
| // the path has a reverse link available. Under most circumstances, this |
| // assumption will hold. |
| private Path invertPath(Path path) { |
| List<Link> reverseLinks = new ArrayList<>(path.links().size()); |
| for (Link link : path.links()) { |
| reverseLinks.add(0, reverseLink(link)); |
| } |
| return new DefaultPath(path.providerId(), reverseLinks, path.cost()); |
| } |
| |
| // Produces a reverse variant of the specified link. |
| private Link reverseLink(Link link) { |
| return new DefaultLink(link.providerId(), link.dst(), link.src(), |
| link.type(), link.state(), link.isDurable()); |
| } |
| |
| // Creates a path intent from the specified path and original connectivity intent. |
| private Intent createPathIntent(Path path, Host src, Host dst, |
| HostToHostIntent intent) { |
| TrafficSelector selector = builder(intent.selector()) |
| .matchEthSrc(src.mac()).matchEthDst(dst.mac()).build(); |
| return new PathIntent(intent.appId(), selector, intent.treatment(), |
| path, intent.constraints()); |
| } |
| |
| } |