| /* |
| * Copyright 2016-present 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.store.resource.impl; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Sets; |
| import org.onosproject.net.resource.ContinuousResource; |
| import org.onosproject.net.resource.ContinuousResourceId; |
| import org.onosproject.net.resource.DiscreteResourceId; |
| import org.onosproject.net.resource.ResourceAllocation; |
| import org.onosproject.net.resource.ResourceConsumerId; |
| import org.onosproject.store.service.TransactionContext; |
| import org.onosproject.store.service.TransactionalMap; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.LinkedHashSet; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static org.onosproject.store.resource.impl.ConsistentResourceStore.SERIALIZER; |
| |
| class TransactionalContinuousResourceSubStore { |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| private final TransactionalMap<DiscreteResourceId, Set<ContinuousResource>> childMap; |
| private final TransactionalMap<ContinuousResourceId, ContinuousResourceAllocation> consumers; |
| |
| TransactionalContinuousResourceSubStore(TransactionContext tx) { |
| this.childMap = tx.getTransactionalMap(MapNames.CONTINUOUS_CHILD_MAP, SERIALIZER); |
| this.consumers = tx.getTransactionalMap(MapNames.CONTINUOUS_CONSUMER_MAP, SERIALIZER); |
| } |
| |
| // iterate over the values in the set: O(n) operation |
| Optional<ContinuousResource> lookup(ContinuousResourceId id) { |
| // continuous resource always has its parent |
| checkArgument(id.parent().isPresent()); |
| |
| Set<ContinuousResource> values = childMap.get(id.parent().get()); |
| if (values == null) { |
| return Optional.empty(); |
| } |
| |
| return values.stream() |
| .filter(x -> x.id().equals(id)) |
| .findFirst(); |
| } |
| |
| boolean register(DiscreteResourceId parent, Set<ContinuousResource> resources) { |
| // short-circuit: receiving empty resource is regarded as success |
| if (resources.isEmpty()) { |
| return true; |
| } |
| |
| Set<ContinuousResource> oldValues = childMap.putIfAbsent(parent, resources); |
| if (oldValues == null) { |
| return true; |
| } |
| |
| Set<ContinuousResource> addedValues = Sets.difference(resources, oldValues); |
| // no new value, then no-op |
| if (addedValues.isEmpty()) { |
| // don't write to map because all values are already stored |
| return true; |
| } |
| |
| Set<ContinuousResourceId> addedIds = addedValues.stream() |
| .map(ContinuousResource::id) |
| .collect(Collectors.toSet()); |
| // if the value is not found but the same ID is found |
| // (this happens only when being continuous resource) |
| if (oldValues.stream().anyMatch(x -> addedIds.contains(x.id()))) { |
| // no-op, but indicating failure (reject the request) |
| return false; |
| } |
| Set<ContinuousResource> newValues = new LinkedHashSet<>(oldValues); |
| newValues.addAll(addedValues); |
| return childMap.replace(parent, oldValues, newValues); |
| } |
| |
| boolean unregister(DiscreteResourceId parent, Set<ContinuousResource> resources) { |
| // short-circuit: receiving empty resource is regarded as success |
| if (resources.isEmpty()) { |
| return true; |
| } |
| |
| // even if one of the resources is allocated to a consumer, |
| // all unregistrations are regarded as failure |
| boolean allocated = resources.stream().anyMatch(x -> isAllocated(x.id())); |
| if (allocated) { |
| log.warn("Failed to unregister {}: allocation exists", parent); |
| return false; |
| } |
| |
| Set<ContinuousResource> oldValues = childMap.putIfAbsent(parent, new LinkedHashSet<>()); |
| if (oldValues == null) { |
| log.trace("No-Op removing values. key {} did not exist", parent); |
| return true; |
| } |
| |
| if (resources.stream().allMatch(x -> !oldValues.contains(x))) { |
| // don't write map because none of the values are stored |
| log.trace("No-Op removing values. key {} did not contain {}", parent, resources); |
| return true; |
| } |
| |
| LinkedHashSet<ContinuousResource> newValues = new LinkedHashSet<>(oldValues); |
| newValues.removeAll(resources); |
| return childMap.replace(parent, oldValues, newValues); |
| } |
| |
| private boolean isAllocated(ContinuousResourceId id) { |
| ContinuousResourceAllocation allocations = consumers.get(id); |
| return allocations != null && !allocations.allocations().isEmpty(); |
| } |
| |
| boolean allocate(ResourceConsumerId consumerId, ContinuousResource request) { |
| // if the resource is not registered, then abort |
| Optional<ContinuousResource> lookedUp = lookup(request.id()); |
| if (!lookedUp.isPresent()) { |
| return false; |
| } |
| // Down cast: this must be safe as ContinuousResource is associated with ContinuousResourceId |
| ContinuousResource original = lookedUp.get(); |
| ContinuousResourceAllocation allocations = consumers.get(request.id()); |
| if (!Optional.ofNullable(allocations) |
| .orElse(ContinuousResourceAllocation.empty(original)) |
| .hasEnoughResource(request)) { |
| return false; |
| } |
| |
| return appendValue(original, new ResourceAllocation(request, consumerId)); |
| } |
| |
| // Appends the specified ResourceAllocation to the existing values stored in the map |
| // computational complexity: O(n) where n is the number of the elements in the associated allocation |
| private boolean appendValue(ContinuousResource original, ResourceAllocation value) { |
| ContinuousResourceAllocation oldValue = consumers.putIfAbsent(original.id(), |
| new ContinuousResourceAllocation(original, ImmutableList.of(value))); |
| if (oldValue == null) { |
| return true; |
| } |
| |
| ContinuousResourceAllocation newValue = oldValue.allocate(value); |
| return consumers.replace(original.id(), oldValue, newValue); |
| } |
| |
| boolean release(ContinuousResource resource, ResourceConsumerId consumerId) { |
| ContinuousResourceAllocation oldAllocation = consumers.get(resource.id()); |
| ContinuousResourceAllocation newAllocation = oldAllocation.release(resource, consumerId); |
| |
| return consumers.replace(resource.id(), oldAllocation, newAllocation); |
| } |
| } |