Rename class by replacing Store with SubStore
Change-Id: I3775d930f593eab983a8da8a4823bae8d45645cb
diff --git a/core/store/dist/src/main/java/org/onosproject/store/resource/impl/TransactionalDiscreteResourceSubStore.java b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/TransactionalDiscreteResourceSubStore.java
new file mode 100644
index 0000000..e8a32eb
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/TransactionalDiscreteResourceSubStore.java
@@ -0,0 +1,144 @@
+/*
+ * 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.Sets;
+import org.onosproject.net.resource.DiscreteResource;
+import org.onosproject.net.resource.DiscreteResourceId;
+import org.onosproject.net.resource.Resource;
+import org.onosproject.net.resource.ResourceConsumerId;
+import org.onosproject.net.resource.Resources;
+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.List;
+import java.util.Optional;
+import java.util.Set;
+
+import static org.onosproject.store.resource.impl.ConsistentResourceStore.SERIALIZER;
+
+class TransactionalDiscreteResourceSubStore {
+ private final Logger log = LoggerFactory.getLogger(getClass());
+ private final TransactionalMap<DiscreteResourceId, Set<DiscreteResource>> childMap;
+ private final TransactionalMap<DiscreteResourceId, ResourceConsumerId> consumers;
+
+ TransactionalDiscreteResourceSubStore(TransactionContext tx) {
+ this.childMap = tx.getTransactionalMap(MapNames.DISCRETE_CHILD_MAP, SERIALIZER);
+ this.consumers = tx.getTransactionalMap(MapNames.DISCRETE_CONSUMER_MAP, SERIALIZER);
+ }
+
+ // check the existence in the set: O(1) operation
+ Optional<DiscreteResource> lookup(DiscreteResourceId id) {
+ if (!id.parent().isPresent()) {
+ return Optional.of(Resource.ROOT);
+ }
+
+ Set<DiscreteResource> values = childMap.get(id.parent().get());
+ if (values == null) {
+ return Optional.empty();
+ }
+
+ DiscreteResource resource = Resources.discrete(id).resource();
+ if (values.contains(resource)) {
+ return Optional.of(resource);
+ } else {
+ return Optional.empty();
+ }
+ }
+
+ boolean register(DiscreteResourceId key, List<DiscreteResource> values) {
+ // short-circuit: receiving empty resource is regarded as success
+ if (values.isEmpty()) {
+ return true;
+ }
+
+ Set<DiscreteResource> requested = new LinkedHashSet<>(values);
+ Set<DiscreteResource> oldValues = childMap.putIfAbsent(key, requested);
+ if (oldValues == null) {
+ return true;
+ }
+
+ Set<DiscreteResource> addedValues = Sets.difference(requested, oldValues);
+ // no new value, then no-op
+ if (addedValues.isEmpty()) {
+ // don't write to map because all values are already stored
+ return true;
+ }
+
+ Set<DiscreteResource> newValues = new LinkedHashSet<>(oldValues);
+ newValues.addAll(addedValues);
+ return childMap.replace(key, oldValues, newValues);
+ }
+
+ boolean unregister(DiscreteResourceId key, List<DiscreteResource> values) {
+ // short-circuit: receiving empty resource is regarded as success
+ if (values.isEmpty()) {
+ return true;
+ }
+
+ // even if one of the resources is allocated to a consumer,
+ // all unregistrations are regarded as failure
+ boolean allocated = values.stream().anyMatch(x -> isAllocated(x.id()));
+ if (allocated) {
+ log.warn("Failed to unregister {}: allocation exists", key);
+ return false;
+ }
+
+ Set<DiscreteResource> oldValues = childMap.putIfAbsent(key, new LinkedHashSet<>());
+ if (oldValues == null) {
+ log.trace("No-Op removing values. key {} did not exist", key);
+ return true;
+ }
+
+ if (values.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 {}", key, values);
+ return true;
+ }
+
+ LinkedHashSet<DiscreteResource> newValues = new LinkedHashSet<>(oldValues);
+ newValues.removeAll(values);
+ return childMap.replace(key, oldValues, newValues);
+ }
+
+ private boolean isAllocated(DiscreteResourceId id) {
+ return consumers.get(id) != null;
+ }
+
+ boolean allocate(ResourceConsumerId consumerId, DiscreteResource resource) {
+ // if the resource is not registered, then abort
+ Optional<DiscreteResource> lookedUp = lookup(resource.id());
+ if (!lookedUp.isPresent()) {
+ return false;
+ }
+
+ ResourceConsumerId oldValue = consumers.put(resource.id(), consumerId);
+ return oldValue == null;
+ }
+
+ boolean release(DiscreteResource resource, ResourceConsumerId consumerId) {
+ // if this single release fails (because the resource is allocated to another consumer)
+ // the whole release fails
+ if (!consumers.remove(resource.id(), consumerId)) {
+ return false;
+ }
+
+ return true;
+ }
+}