| /* |
| * 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.onlab.onos.store.resource.impl; |
| |
| 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.Service; |
| import org.onlab.onos.net.Link; |
| import org.onlab.onos.net.intent.IntentId; |
| import org.onlab.onos.net.resource.Bandwidth; |
| import org.onlab.onos.net.resource.BandwidthResourceAllocation; |
| import org.onlab.onos.net.resource.Lambda; |
| import org.onlab.onos.net.resource.LambdaResourceAllocation; |
| import org.onlab.onos.net.resource.LinkResourceAllocations; |
| import org.onlab.onos.net.resource.LinkResourceStore; |
| import org.onlab.onos.net.resource.ResourceAllocation; |
| import org.onlab.onos.net.resource.ResourceType; |
| import org.slf4j.Logger; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Preconditions.checkState; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * Manages link resources using trivial in-memory structures implementation. |
| */ |
| @Component(immediate = true) |
| @Service |
| public class DistributedLinkResourceStore implements LinkResourceStore { |
| private final Logger log = getLogger(getClass()); |
| private Map<IntentId, LinkResourceAllocations> linkResourceAllocationsMap; |
| private Map<Link, Set<LinkResourceAllocations>> allocatedResources; |
| private Map<Link, Set<ResourceAllocation>> freeResources; |
| |
| @Activate |
| public void activate() { |
| linkResourceAllocationsMap = new HashMap<>(); |
| allocatedResources = new HashMap<>(); |
| freeResources = new HashMap<>(); |
| |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| log.info("Stopped"); |
| } |
| |
| /** |
| * Returns free resources for a given link obtaining from topology |
| * information. |
| * |
| * @param link the target link |
| * @return free resources |
| */ |
| private Set<ResourceAllocation> readOriginalFreeResources(Link link) { |
| // TODO read capacity and lambda resources from topology |
| Set<ResourceAllocation> allocations = new HashSet<>(); |
| for (int i = 1; i <= 100; i++) { |
| allocations.add(new LambdaResourceAllocation(Lambda.valueOf(i))); |
| } |
| allocations.add(new BandwidthResourceAllocation(Bandwidth.valueOf(1000000))); |
| return allocations; |
| } |
| |
| /** |
| * Finds and returns {@link org.onlab.onos.net.resource.BandwidthResourceAllocation} object from a given |
| * set. |
| * |
| * @param freeRes a set of ResourceAllocation object. |
| * @return {@link org.onlab.onos.net.resource.BandwidthResourceAllocation} object if found, otherwise |
| * {@link org.onlab.onos.net.resource.BandwidthResourceAllocation} object with 0 bandwidth |
| * |
| */ |
| private BandwidthResourceAllocation getBandwidth(Set<ResourceAllocation> freeRes) { |
| for (ResourceAllocation res : freeRes) { |
| if (res.type() == ResourceType.BANDWIDTH) { |
| return (BandwidthResourceAllocation) res; |
| } |
| } |
| return new BandwidthResourceAllocation(Bandwidth.valueOf(0)); |
| } |
| |
| /** |
| * Subtracts given resources from free resources for given link. |
| * |
| * @param link the target link |
| * @param allocations the resources to be subtracted |
| */ |
| private void subtractFreeResources(Link link, LinkResourceAllocations allocations) { |
| // TODO Use lock or version for updating freeResources. |
| checkNotNull(link); |
| Set<ResourceAllocation> freeRes = new HashSet<>(getFreeResources(link)); |
| Set<ResourceAllocation> subRes = allocations.getResourceAllocation(link); |
| for (ResourceAllocation res : subRes) { |
| switch (res.type()) { |
| case BANDWIDTH: |
| BandwidthResourceAllocation ba = getBandwidth(freeRes); |
| double requestedBandwidth = |
| ((BandwidthResourceAllocation) res).bandwidth().toDouble(); |
| double newBandwidth = ba.bandwidth().toDouble() - requestedBandwidth; |
| checkState(newBandwidth >= 0.0); |
| freeRes.remove(ba); |
| freeRes.add(new BandwidthResourceAllocation( |
| Bandwidth.valueOf(newBandwidth))); |
| break; |
| case LAMBDA: |
| checkState(freeRes.remove(res)); |
| break; |
| default: |
| break; |
| } |
| } |
| freeResources.put(link, freeRes); |
| |
| } |
| |
| /** |
| * Adds given resources to free resources for given link. |
| * |
| * @param link the target link |
| * @param allocations the resources to be added |
| */ |
| private void addFreeResources(Link link, LinkResourceAllocations allocations) { |
| // TODO Use lock or version for updating freeResources. |
| Set<ResourceAllocation> freeRes = new HashSet<>(getFreeResources(link)); |
| Set<ResourceAllocation> addRes = allocations.getResourceAllocation(link); |
| for (ResourceAllocation res : addRes) { |
| switch (res.type()) { |
| case BANDWIDTH: |
| BandwidthResourceAllocation ba = getBandwidth(freeRes); |
| double requestedBandwidth = |
| ((BandwidthResourceAllocation) res).bandwidth().toDouble(); |
| double newBandwidth = ba.bandwidth().toDouble() + requestedBandwidth; |
| freeRes.remove(ba); |
| freeRes.add(new BandwidthResourceAllocation( |
| Bandwidth.valueOf(newBandwidth))); |
| break; |
| case LAMBDA: |
| checkState(freeRes.add(res)); |
| break; |
| default: |
| break; |
| } |
| } |
| freeResources.put(link, freeRes); |
| } |
| |
| @Override |
| public Set<ResourceAllocation> getFreeResources(Link link) { |
| checkNotNull(link); |
| Set<ResourceAllocation> freeRes = freeResources.get(link); |
| if (freeRes == null) { |
| freeRes = readOriginalFreeResources(link); |
| } |
| |
| return freeRes; |
| } |
| |
| @Override |
| public void allocateResources(LinkResourceAllocations allocations) { |
| checkNotNull(allocations); |
| linkResourceAllocationsMap.put(allocations.intendId(), allocations); |
| for (Link link : allocations.links()) { |
| subtractFreeResources(link, allocations); |
| Set<LinkResourceAllocations> linkAllocs = allocatedResources.get(link); |
| if (linkAllocs == null) { |
| linkAllocs = new HashSet<>(); |
| } |
| linkAllocs.add(allocations); |
| allocatedResources.put(link, linkAllocs); |
| } |
| } |
| |
| @Override |
| public void releaseResources(LinkResourceAllocations allocations) { |
| checkNotNull(allocations); |
| linkResourceAllocationsMap.remove(allocations.intendId()); |
| for (Link link : allocations.links()) { |
| addFreeResources(link, allocations); |
| Set<LinkResourceAllocations> linkAllocs = allocatedResources.get(link); |
| if (linkAllocs == null) { |
| log.error("Missing resource allocation."); |
| } else { |
| linkAllocs.remove(allocations); |
| } |
| allocatedResources.put(link, linkAllocs); |
| } |
| } |
| |
| @Override |
| public LinkResourceAllocations getAllocations(IntentId intentId) { |
| checkNotNull(intentId); |
| return linkResourceAllocationsMap.get(intentId); |
| } |
| |
| @Override |
| public Iterable<LinkResourceAllocations> getAllocations(Link link) { |
| checkNotNull(link); |
| Set<LinkResourceAllocations> result = allocatedResources.get(link); |
| if (result == null) { |
| result = Collections.emptySet(); |
| } |
| return Collections.unmodifiableSet(result); |
| } |
| |
| @Override |
| public Iterable<LinkResourceAllocations> getAllocations() { |
| return Collections.unmodifiableCollection(linkResourceAllocationsMap.values()); |
| } |
| |
| } |