/**
* 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;
}
@Override
public boolean validate(Path path, LinkResourceService resourceService) {
LinkedList<DeviceId> waypoints = new LinkedList<>(this.waypoints);
DeviceId current = waypoints.poll();
// This is safe because Path class ensures the number of links are more than 0
Link firstLink = path.links().get(0);
if (firstLink.src().elementId().equals(current)) {
current = waypoints.poll();
}
for (Link link : path.links()) {
if (link.dst().elementId().equals(current)) {
current = waypoints.poll();
// Empty waypoints means passing through all waypoints in the specified order
if (current == null) {
return true;
}
}
}
return false;
}
// Produces a direct edge-to-edge path.
private Path edgeToEdgePath(EdgeLink srcLink, EdgeLink dstLink, Path path) {
List<Link> links = Lists.newArrayListWithCapacity(2);
// Add source and destination edge links only if they are real and
// add the infrastructure path only if it is not null.
if (srcLink != NOT_HOST) {
links.add(srcLink);
}
if (path != null) {
links.addAll(path.links());
}
if (dstLink != NOT_HOST) {
links.add(dstLink);
}
return new DefaultPath(PID, links, 2);
}