2 * Copyright 2015 Open Networking Laboratory
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.onosproject.store.newresource.impl;
18 import com.google.common.annotations.Beta;
19 import org.apache.felix.scr.annotations.Activate;
20 import org.apache.felix.scr.annotations.Component;
21 import org.apache.felix.scr.annotations.Reference;
22 import org.apache.felix.scr.annotations.ReferenceCardinality;
23 import org.apache.felix.scr.annotations.Service;
24 import org.onosproject.net.newresource.ResourceConsumer;
25 import org.onosproject.net.newresource.ResourcePath;
26 import org.onosproject.net.newresource.ResourceStore;
27 import org.onosproject.store.serializers.KryoNamespaces;
28 import org.onosproject.store.service.ConsistentMap;
29 import org.onosproject.store.service.Serializer;
30 import org.onosproject.store.service.StorageService;
31 import org.onosproject.store.service.TransactionContext;
32 import org.onosproject.store.service.TransactionalMap;
33 import org.onosproject.store.service.Versioned;
34 import org.slf4j.Logger;
35 import org.slf4j.LoggerFactory;
37 import java.util.ArrayList;
38 import java.util.Arrays;
39 import java.util.Collection;
40 import java.util.Collections;
41 import java.util.Iterator;
42 import java.util.LinkedHashSet;
43 import java.util.List;
45 import java.util.Optional;
46 import java.util.stream.Collectors;
48 import static com.google.common.base.Preconditions.checkArgument;
49 import static com.google.common.base.Preconditions.checkNotNull;
52 * Implementation of ResourceStore using TransactionalMap.
54 @Component(immediate = true)
57 public class ConsistentResourceStore implements ResourceStore {
58 private static final Logger log = LoggerFactory.getLogger(ConsistentResourceStore.class);
60 private static final String CONSUMER_MAP = "onos-resource-consumers";
61 private static final String CHILD_MAP = "onos-resource-children";
62 private static final Serializer SERIALIZER = Serializer.using(
63 Arrays.asList(KryoNamespaces.BASIC, KryoNamespaces.API));
65 @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
66 protected StorageService service;
68 private ConsistentMap<ResourcePath, ResourceConsumer> consumerMap;
69 private ConsistentMap<ResourcePath, List<ResourcePath>> childMap;
72 public void activate() {
73 consumerMap = service.<ResourcePath, ResourceConsumer>consistentMapBuilder()
74 .withName(CONSUMER_MAP)
75 .withSerializer(SERIALIZER)
77 childMap = service.<ResourcePath, List<ResourcePath>>consistentMapBuilder()
79 .withSerializer(SERIALIZER)
84 public Optional<ResourceConsumer> getConsumer(ResourcePath resource) {
85 checkNotNull(resource);
87 Versioned<ResourceConsumer> consumer = consumerMap.get(resource);
88 if (consumer == null) {
89 return Optional.empty();
92 return Optional.of(consumer.value());
96 public boolean register(List<ResourcePath> resources) {
97 checkNotNull(resources);
99 TransactionContext tx = service.transactionContextBuilder().build();
102 TransactionalMap<ResourcePath, List<ResourcePath>> childTxMap =
103 tx.getTransactionalMap(CHILD_MAP, SERIALIZER);
105 Map<ResourcePath, List<ResourcePath>> resourceMap = resources.stream()
106 .filter(x -> x.parent().isPresent())
107 .collect(Collectors.groupingBy(x -> x.parent().get()));
109 for (Map.Entry<ResourcePath, List<ResourcePath>> entry: resourceMap.entrySet()) {
110 if (!isRegistered(childTxMap, entry.getKey())) {
111 return abortTransaction(tx);
114 if (!appendValues(childTxMap, entry.getKey(), entry.getValue())) {
115 return abortTransaction(tx);
123 public boolean unregister(List<ResourcePath> resources) {
124 checkNotNull(resources);
126 TransactionContext tx = service.transactionContextBuilder().build();
129 TransactionalMap<ResourcePath, List<ResourcePath>> childTxMap =
130 tx.getTransactionalMap(CHILD_MAP, SERIALIZER);
131 TransactionalMap<ResourcePath, ResourceConsumer> consumerTxMap =
132 tx.getTransactionalMap(CONSUMER_MAP, SERIALIZER);
134 Map<ResourcePath, List<ResourcePath>> resourceMap = resources.stream()
135 .filter(x -> x.parent().isPresent())
136 .collect(Collectors.groupingBy(x -> x.parent().get()));
138 // even if one of the resources is allocated to a consumer,
139 // all unregistrations are regarded as failure
140 for (Map.Entry<ResourcePath, List<ResourcePath>> entry: resourceMap.entrySet()) {
141 if (entry.getValue().stream().anyMatch(x -> consumerTxMap.get(x) != null)) {
142 return abortTransaction(tx);
145 if (!removeValues(childTxMap, entry.getKey(), entry.getValue())) {
146 return abortTransaction(tx);
154 public boolean allocate(List<ResourcePath> resources, ResourceConsumer consumer) {
155 checkNotNull(resources);
156 checkNotNull(consumer);
158 TransactionContext tx = service.transactionContextBuilder().build();
161 TransactionalMap<ResourcePath, List<ResourcePath>> childTxMap =
162 tx.getTransactionalMap(CHILD_MAP, SERIALIZER);
163 TransactionalMap<ResourcePath, ResourceConsumer> consumerTxMap =
164 tx.getTransactionalMap(CONSUMER_MAP, SERIALIZER);
166 for (ResourcePath resource: resources) {
167 if (!isRegistered(childTxMap, resource)) {
168 return abortTransaction(tx);
171 ResourceConsumer oldValue = consumerTxMap.put(resource, consumer);
172 if (oldValue != null) {
173 return abortTransaction(tx);
181 public boolean release(List<ResourcePath> resources, List<ResourceConsumer> consumers) {
182 checkNotNull(resources);
183 checkNotNull(consumers);
184 checkArgument(resources.size() == consumers.size());
186 TransactionContext tx = service.transactionContextBuilder().build();
189 TransactionalMap<ResourcePath, ResourceConsumer> consumerTxMap =
190 tx.getTransactionalMap(CONSUMER_MAP, SERIALIZER);
191 Iterator<ResourcePath> resourceIte = resources.iterator();
192 Iterator<ResourceConsumer> consumerIte = consumers.iterator();
194 while (resourceIte.hasNext() && consumerIte.hasNext()) {
195 ResourcePath resource = resourceIte.next();
196 ResourceConsumer consumer = consumerIte.next();
198 // if this single release fails (because the resource is allocated to another consumer,
199 // the whole release fails
200 if (!consumerTxMap.remove(resource, consumer)) {
201 return abortTransaction(tx);
209 public Collection<ResourcePath> getResources(ResourceConsumer consumer) {
210 checkNotNull(consumer);
212 // NOTE: getting all entries may become performance bottleneck
213 // TODO: revisit for better backend data structure
214 return consumerMap.entrySet().stream()
215 .filter(x -> x.getValue().value().equals(consumer))
216 .map(Map.Entry::getKey)
217 .collect(Collectors.toList());
221 public Collection<ResourcePath> getChildResources(ResourcePath parent) {
222 checkNotNull(parent);
224 Versioned<List<ResourcePath>> children = childMap.get(parent);
225 if (children == null) {
226 return Collections.emptyList();
229 return children.value();
233 public <T> Collection<ResourcePath> getAllocatedResources(ResourcePath parent, Class<T> cls) {
234 checkNotNull(parent);
237 Versioned<List<ResourcePath>> children = childMap.get(parent);
238 if (children == null) {
239 return Collections.emptyList();
242 return children.value().stream()
243 .filter(x -> x.lastComponent().getClass().equals(cls))
244 .filter(consumerMap::containsKey)
245 .collect(Collectors.toList());
249 * Abort the transaction.
251 * @param tx transaction context
252 * @return always false
254 private boolean abortTransaction(TransactionContext tx) {
260 * Appends the values to the existing values associated with the specified key.
261 * If the map already has all the given values, appending will not happen.
263 * @param map map holding multiple values for a key
264 * @param key key specifying values
265 * @param values values to be appended
266 * @param <K> type of the key
267 * @param <V> type of the element of the list
268 * @return true if the operation succeeds, false otherwise.
270 private <K, V> boolean appendValues(TransactionalMap<K, List<V>> map, K key, List<V> values) {
271 List<V> oldValues = map.get(key);
272 if (oldValues == null) {
273 return map.replace(key, oldValues, new ArrayList<>(values));
276 LinkedHashSet<V> oldSet = new LinkedHashSet<>(oldValues);
277 if (oldSet.containsAll(values)) {
278 // don't write to map because all values are already stored
282 oldSet.addAll(values);
283 return map.replace(key, oldValues, new ArrayList<>(oldSet));
287 * Removes the values from the existing values associated with the specified key.
288 * If the map doesn't contain the given values, removal will not happen.
290 * @param map map holding multiple values for a key
291 * @param key key specifying values
292 * @param values values to be removed
293 * @param <K> type of the key
294 * @param <V> type of the element of the list
295 * @return true if the operation succeeds, false otherwise
297 private <K, V> boolean removeValues(TransactionalMap<K, List<V>> map, K key, List<V> values) {
298 List<V> oldValues = map.get(key);
299 if (oldValues == null) {
300 return map.replace(key, oldValues, new ArrayList<>());
303 LinkedHashSet<V> oldSet = new LinkedHashSet<>(oldValues);
304 if (values.stream().allMatch(x -> !oldSet.contains(x))) {
305 // don't write map because none of the values are stored
309 oldSet.removeAll(values);
310 return map.replace(key, oldValues, new ArrayList<>(oldSet));
314 * Checks if the specified resource is registered as a child of a resource in the map.
316 * @param map map storing parent - child relationship of resources
317 * @param resource resource to be checked
318 * @return true if the resource is registered, false otherwise.
320 private boolean isRegistered(TransactionalMap<ResourcePath, List<ResourcePath>> map, ResourcePath resource) {
321 // root is always regarded to be registered
322 if (resource.isRoot()) {
326 List<ResourcePath> value = map.get(resource.parent().get());
327 return value != null && value.contains(resource);