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/*
* Copyright 2014-2015 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.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.link.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 PathIntent.builder()
.appId(intent.appId())
.selector(selector)
.treatment(intent.treatment())
.path(path)
.constraints(intent.constraints())
.priority(intent.priority())
.build();
}
}
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