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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.resource.impl;
import com.google.common.collect.Sets;
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.apache.felix.scr.annotations.Service;
import org.onosproject.event.AbstractListenerManager;
import org.onosproject.net.Link;
import org.onosproject.net.intent.IntentId;
import org.onosproject.net.resource.ResourceAllocation;
import org.onosproject.net.resource.ResourceRequest;
import org.onosproject.net.resource.ResourceType;
import org.onosproject.net.resource.link.BandwidthResourceAllocation;
import org.onosproject.net.resource.link.BandwidthResourceRequest;
import org.onosproject.net.resource.link.DefaultLinkResourceAllocations;
import org.onosproject.net.resource.link.LambdaResource;
import org.onosproject.net.resource.link.LambdaResourceAllocation;
import org.onosproject.net.resource.link.LambdaResourceRequest;
import org.onosproject.net.resource.link.LinkResourceAllocations;
import org.onosproject.net.resource.link.LinkResourceEvent;
import org.onosproject.net.resource.link.LinkResourceListener;
import org.onosproject.net.resource.link.LinkResourceRequest;
import org.onosproject.net.resource.link.LinkResourceService;
import org.onosproject.net.resource.link.LinkResourceStore;
import org.onosproject.net.resource.link.LinkResourceStoreDelegate;
import org.onosproject.net.resource.link.MplsLabel;
import org.onosproject.net.resource.link.MplsLabelResourceAllocation;
import org.onosproject.net.resource.link.MplsLabelResourceRequest;
import org.slf4j.Logger;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static org.onosproject.security.AppGuard.checkPermission;
import static org.slf4j.LoggerFactory.getLogger;
import static org.onosproject.security.AppPermission.Type.*;
/**
* Provides basic implementation of link resources allocation.
*/
@Component(immediate = true)
@Service
public class LinkResourceManager
extends AbstractListenerManager<LinkResourceEvent, LinkResourceListener>
implements LinkResourceService {
private final Logger log = getLogger(getClass());
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
private LinkResourceStore store;
@Activate
public void activate() {
eventDispatcher.addSink(LinkResourceEvent.class, listenerRegistry);
log.info("Started");
}
@Deactivate
public void deactivate() {
eventDispatcher.removeSink(LinkResourceEvent.class);
log.info("Stopped");
}
/**
* Returns available lambdas on specified link.
*
* @param link the link
* @return available lambdas on specified link
*/
private Set<LambdaResource> getAvailableLambdas(Link link) {
checkNotNull(link);
Set<ResourceAllocation> resAllocs = store.getFreeResources(link);
if (resAllocs == null) {
return Collections.emptySet();
}
Set<LambdaResource> lambdas = new HashSet<>();
for (ResourceAllocation res : resAllocs) {
if (res.type() == ResourceType.LAMBDA) {
lambdas.add(((LambdaResourceAllocation) res).lambda());
}
}
return lambdas;
}
/**
* Returns available lambdas on specified links.
*
* @param links the links
* @return available lambdas on specified links
*/
private Iterable<LambdaResource> getAvailableLambdas(Iterable<Link> links) {
checkNotNull(links);
Iterator<Link> i = links.iterator();
checkArgument(i.hasNext());
Set<LambdaResource> lambdas = new HashSet<>(getAvailableLambdas(i.next()));
while (i.hasNext()) {
lambdas.retainAll(getAvailableLambdas(i.next()));
}
return lambdas;
}
/**
* Returns available MPLS label on specified link.
*
* @param link the link
* @return available MPLS labels on specified link
*/
private Iterable<MplsLabel> getAvailableMplsLabels(Link link) {
Set<ResourceAllocation> resAllocs = store.getFreeResources(link);
if (resAllocs == null) {
return Collections.emptySet();
}
Set<MplsLabel> mplsLabels = new HashSet<>();
for (ResourceAllocation res : resAllocs) {
if (res.type() == ResourceType.MPLS_LABEL) {
mplsLabels.add(((MplsLabelResourceAllocation) res).mplsLabel());
}
}
return mplsLabels;
}
@Override
public LinkResourceAllocations requestResources(LinkResourceRequest req) {
checkPermission(LINK_WRITE);
// TODO Concatenate multiple bandwidth requests.
// TODO Support multiple lambda resource requests.
// TODO Throw appropriate exception.
Set<ResourceAllocation> allocs = new HashSet<>();
Map<Link, Set<ResourceAllocation>> allocsPerLink = new HashMap<>();
for (ResourceRequest r : req.resources()) {
switch (r.type()) {
case BANDWIDTH:
BandwidthResourceRequest br = (BandwidthResourceRequest) r;
allocs.add(new BandwidthResourceAllocation(br.bandwidth()));
break;
case LAMBDA:
Iterator<LambdaResource> lambdaIterator =
getAvailableLambdas(req.links()).iterator();
if (lambdaIterator.hasNext()) {
allocs.add(new LambdaResourceAllocation(lambdaIterator.next()));
} else {
log.info("Failed to allocate lambda resource.");
return null;
}
break;
case MPLS_LABEL:
for (Link link : req.links()) {
if (allocsPerLink.get(link) == null) {
allocsPerLink.put(link, new HashSet<>());
}
Iterator<MplsLabel> mplsIter = getAvailableMplsLabels(link)
.iterator();
if (mplsIter.hasNext()) {
allocsPerLink.get(link)
.add(new MplsLabelResourceAllocation(mplsIter
.next()));
} else {
log.info("Failed to allocate MPLS resource.");
break;
}
}
break;
default:
break;
}
}
Map<Link, Set<ResourceAllocation>> allocations = new HashMap<>();
for (Link link : req.links()) {
allocations.put(link, new HashSet<>(allocs));
Set<ResourceAllocation> linkAllocs = allocsPerLink.get(link);
if (linkAllocs != null) {
allocations.get(link).addAll(linkAllocs);
}
}
LinkResourceAllocations result =
new DefaultLinkResourceAllocations(req, allocations);
store.allocateResources(result);
return result;
}
@Override
public void releaseResources(LinkResourceAllocations allocations) {
checkPermission(LINK_WRITE);
final LinkResourceEvent event = store.releaseResources(allocations);
if (event != null) {
post(event);
}
}
@Override
public LinkResourceAllocations updateResources(LinkResourceRequest req,
LinkResourceAllocations oldAllocations) {
checkPermission(LINK_WRITE);
releaseResources(oldAllocations);
return requestResources(req);
}
@Override
public Iterable<LinkResourceAllocations> getAllocations() {
checkPermission(LINK_READ);
return store.getAllocations();
}
@Override
public Iterable<LinkResourceAllocations> getAllocations(Link link) {
checkPermission(LINK_READ);
return store.getAllocations(link);
}
@Override
public LinkResourceAllocations getAllocations(IntentId intentId) {
checkPermission(LINK_READ);
return store.getAllocations(intentId);
}
@Override
public Iterable<ResourceRequest> getAvailableResources(Link link) {
checkPermission(LINK_READ);
Set<ResourceAllocation> freeRes = store.getFreeResources(link);
Set<ResourceRequest> result = new HashSet<>();
for (ResourceAllocation alloc : freeRes) {
switch (alloc.type()) {
case BANDWIDTH:
result.add(new BandwidthResourceRequest(
((BandwidthResourceAllocation) alloc).bandwidth()));
break;
case LAMBDA:
result.add(new LambdaResourceRequest());
break;
case MPLS_LABEL:
result.add(new MplsLabelResourceRequest());
break;
default:
break;
}
}
return result;
}
@Override
public Iterable<ResourceRequest> getAvailableResources(Link link,
LinkResourceAllocations allocations) {
checkPermission(LINK_READ);
Set<ResourceAllocation> allocatedRes = allocations.getResourceAllocation(link);
Set<ResourceRequest> result = Sets.newHashSet(getAvailableResources(link));
result.removeAll(allocatedRes);
return result;
}
/**
* Store delegate to re-post events emitted from the store.
*/
private class InternalStoreDelegate implements LinkResourceStoreDelegate {
@Override
public void notify(LinkResourceEvent event) {
post(event);
}
}
}
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