| /* |
| * Copyright 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.store.newresource.impl; |
| |
| import com.google.common.annotations.Beta; |
| import org.apache.felix.scr.annotations.Activate; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Reference; |
| import org.apache.felix.scr.annotations.ReferenceCardinality; |
| import org.apache.felix.scr.annotations.Service; |
| import org.onosproject.net.newresource.Resource; |
| import org.onosproject.net.newresource.ResourceConsumer; |
| import org.onosproject.net.newresource.ResourceStore; |
| import org.onosproject.store.serializers.KryoNamespaces; |
| import org.onosproject.store.service.ConsistentMap; |
| import org.onosproject.store.service.Serializer; |
| import org.onosproject.store.service.StorageService; |
| import org.onosproject.store.service.TransactionContext; |
| import org.onosproject.store.service.TransactionException; |
| import org.onosproject.store.service.TransactionalMap; |
| import org.onosproject.store.service.Versioned; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.stream.Collectors; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * Implementation of ResourceStore using TransactionalMap. |
| */ |
| @Component(immediate = true, enabled = false) |
| @Service |
| @Beta |
| public class ConsistentResourceStore implements ResourceStore { |
| private static final Logger log = LoggerFactory.getLogger(ConsistentResourceStore.class); |
| |
| private static final String MAP_NAME = "onos-resource-consumers"; |
| private static final Serializer SERIALIZER = Serializer.using(KryoNamespaces.API); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY) |
| protected StorageService service; |
| |
| private ConsistentMap<Resource<?, ?>, ResourceConsumer> consumers; |
| |
| @Activate |
| public void activate() { |
| consumers = service.<Resource<?, ?>, ResourceConsumer>consistentMapBuilder() |
| .withName(MAP_NAME) |
| .withSerializer(SERIALIZER) |
| .build(); |
| } |
| |
| @Override |
| public <S, T> Optional<ResourceConsumer> getConsumer(Resource<S, T> resource) { |
| checkNotNull(resource); |
| |
| Versioned<ResourceConsumer> consumer = consumers.get(resource); |
| if (consumer == null) { |
| return Optional.empty(); |
| } |
| |
| return Optional.of(consumer.value()); |
| } |
| |
| @Override |
| public boolean allocate(List<? extends Resource<?, ?>> resources, ResourceConsumer consumer) { |
| checkNotNull(resources); |
| checkNotNull(consumer); |
| |
| TransactionContext tx = service.transactionContextBuilder().build(); |
| tx.begin(); |
| |
| try { |
| TransactionalMap<Resource<?, ?>, ResourceConsumer> txMap = tx.getTransactionalMap(MAP_NAME, SERIALIZER); |
| for (Resource<?, ?> resource: resources) { |
| ResourceConsumer existing = txMap.putIfAbsent(resource, consumer); |
| // if the resource is already allocated to another consumer, the whole allocation fails |
| if (existing != null) { |
| tx.abort(); |
| return false; |
| } |
| } |
| tx.commit(); |
| return true; |
| } catch (Exception e) { |
| log.error("Exception thrown, abort the transaction", e); |
| tx.abort(); |
| return false; |
| } |
| } |
| |
| @Override |
| public boolean release(List<? extends Resource<?, ?>> resources, List<ResourceConsumer> consumers) { |
| checkNotNull(resources); |
| checkNotNull(consumers); |
| checkArgument(resources.size() == consumers.size()); |
| |
| TransactionContext tx = service.transactionContextBuilder().build(); |
| tx.begin(); |
| |
| try { |
| TransactionalMap<Resource<?, ?>, ResourceConsumer> txMap = tx.getTransactionalMap(MAP_NAME, SERIALIZER); |
| Iterator<? extends Resource<?, ?>> resourceIte = resources.iterator(); |
| Iterator<ResourceConsumer> consumerIte = consumers.iterator(); |
| |
| while (resourceIte.hasNext() && consumerIte.hasNext()) { |
| Resource<?, ?> resource = resourceIte.next(); |
| ResourceConsumer consumer = consumerIte.next(); |
| |
| // if this single release fails (because the resource is allocated to another consumer, |
| // the whole release fails |
| if (!txMap.remove(resource, consumer)) { |
| tx.abort(); |
| return false; |
| } |
| } |
| |
| return true; |
| } catch (TransactionException e) { |
| log.error("Exception thrown, abort the transaction", e); |
| tx.abort(); |
| return false; |
| } |
| } |
| |
| @Override |
| public Collection<Resource<?, ?>> getResources(ResourceConsumer consumer) { |
| checkNotNull(consumer); |
| |
| // NOTE: getting all entries may become performance bottleneck |
| // TODO: revisit for better backend data structure |
| return consumers.entrySet().stream() |
| .filter(x -> x.getValue().value().equals(consumer)) |
| .map(Map.Entry::getKey) |
| .collect(Collectors.toList()); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <S, T> Collection<Resource<S, T>> getAllocatedResources(S subject, Class<T> cls) { |
| checkNotNull(subject); |
| checkNotNull(cls); |
| |
| // NOTE: getting all entries may become performance bottleneck |
| // TODO: revisit for better backend data structure |
| return consumers.entrySet().stream() |
| .filter(x -> x.getKey().subject().equals(subject) && x.getKey().resource().getClass() == cls) |
| // cast is ensured by the above filter method |
| .map(x -> (Resource<S, T>) x.getKey()) |
| .collect(Collectors.toList()); |
| } |
| } |