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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;
import java.util.List;
import com.google.common.annotations.Beta;
import org.onosproject.core.ApplicationId;
import org.onosproject.net.Link;
import org.onosproject.net.Path;
import org.onosproject.net.flow.TrafficSelector;
import org.onosproject.net.flow.TrafficTreatment;
import com.google.common.base.MoreObjects;
import com.google.common.collect.Iterables;
import static com.google.common.base.Preconditions.checkArgument;
/**
* Abstraction of explicitly path specified connectivity intent.
*/
@Beta
public class PathIntent extends ConnectivityIntent {
private final Path path;
/**
* Creates a new point-to-point intent with the supplied ingress/egress
* ports and using the specified explicit path.
*
* @param appId application identifier
* @param selector traffic selector
* @param treatment treatment
* @param path traversed links
* @param constraints optional list of constraints
* @param priority priority to use for the generated flows
* @throws NullPointerException {@code path} is null
*/
protected PathIntent(ApplicationId appId,
TrafficSelector selector,
TrafficTreatment treatment,
Path path,
List<Constraint> constraints,
int priority) {
super(appId, null, resources(path.links()), selector, treatment, constraints,
priority);
PathIntent.validate(path.links());
this.path = path;
}
/**
* Constructor for serializer.
*/
protected PathIntent() {
super();
this.path = null;
}
/**
* Returns a new host to host intent builder.
*
* @return host to host intent builder
*/
public static Builder builder() {
return new Builder();
}
/**
* Builder of a host to host intent.
*/
public static class Builder extends ConnectivityIntent.Builder {
Path path;
protected Builder() {
// Hide default constructor
}
@Override
public Builder appId(ApplicationId appId) {
return (Builder) super.appId(appId);
}
@Override
public Builder key(Key key) {
return (Builder) super.key(key);
}
@Override
public Builder selector(TrafficSelector selector) {
return (Builder) super.selector(selector);
}
@Override
public Builder treatment(TrafficTreatment treatment) {
return (Builder) super.treatment(treatment);
}
@Override
public Builder constraints(List<Constraint> constraints) {
return (Builder) super.constraints(constraints);
}
@Override
public Builder priority(int priority) {
return (Builder) super.priority(priority);
}
/**
* Sets the path of the intent that will be built.
*
* @param path path for the intent
* @return this builder
*/
public Builder path(Path path) {
this.path = path;
return this;
}
/**
* Builds a path intent from the accumulated parameters.
*
* @return point to point intent
*/
public PathIntent build() {
return new PathIntent(
appId,
selector,
treatment,
path,
constraints,
priority
);
}
}
// NOTE: This methods takes linear time with the number of links.
/**
* Validates that source element ID and destination element ID of a link are
* different for the specified all links and that destination element ID of a link and source
* element ID of the next adjacent source element ID are same for the specified all links.
*
* @param links links to be validated
*/
public static void validate(List<Link> links) {
checkArgument(Iterables.all(links, link -> !link.src().elementId().equals(link.dst().elementId())),
"element of src and dst in a link must be different: {}", links);
boolean adjacentSame = true;
for (int i = 0; i < links.size() - 1; i++) {
if (!links.get(i).dst().elementId().equals(links.get(i + 1).src().elementId())) {
adjacentSame = false;
break;
}
}
checkArgument(adjacentSame, "adjacent links must share the same element: {}", links);
}
/**
* Returns the links which the traffic goes along.
*
* @return traversed links
*/
public Path path() {
return path;
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("id", id())
.add("appId", appId())
.add("priority", priority())
.add("resources", resources())
.add("selector", selector())
.add("treatment", treatment())
.add("constraints", constraints())
.add("path", path)
.toString();
}
}
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