Provide an implementation of ApplicationIdStore atop AtomicCounter and Consisten…

…tMap + Disaable the hazelcast version

Change-Id: I26afea0fadae272baafc55edd8f6c8194b41e3a7

+/*
+ * 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.core.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Map;
+import java.util.Set;
+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.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.ApplicationIdStore;
+import org.onosproject.core.DefaultApplicationId;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.AtomicCounter;
+import org.onosproject.store.service.ConsistentMap;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.Versioned;
+import org.slf4j.Logger;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Maps;
+
+/**
+ * ApplicationIdStore implementation on top of {@code AtomicCounter}
+ * and {@code ConsistentMap} primitives.
+ */
+@Component(immediate = true, enabled = true)
+@Service
+public class ConsistentApplicationIdStore implements ApplicationIdStore {
+
+    private final Logger log = getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected StorageService storageService;
+
+    private AtomicCounter appIdCounter;
+    private ConsistentMap<String, ApplicationId> registeredIds;
+    private Map<String, ApplicationId> nameToAppIdCache = Maps.newConcurrentMap();
+    private Map<Short, ApplicationId> idToAppIdCache = Maps.newConcurrentMap();
+
+    private static final Serializer SERIALIZER = Serializer.using(new KryoNamespace.Builder()
+                                                                        .register(KryoNamespaces.API)
+                                                                        .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
+                                                                        .build());
+
+    @Activate
+    public void activate() {
+        appIdCounter = storageService.atomicCounterBuilder()
+                                      .withName("onos-app-id-counter")
+                                      .withPartitionsDisabled()
+                                      .build();
+
+        registeredIds = storageService.<String, ApplicationId>consistentMapBuilder()
+                .withName("onos-app-ids")
+                .withPartitionsDisabled()
+                .withSerializer(SERIALIZER)
+                .build();
+
+        primeAppIds();
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        log.info("Stopped");
+    }
+
+    @Override
+    public Set<ApplicationId> getAppIds() {
+        // TODO: Rework this when we have notification support in ConsistentMap.
+        primeAppIds();
+        return ImmutableSet.copyOf(nameToAppIdCache.values());
+    }
+
+    @Override
+    public ApplicationId getAppId(Short id) {
+        if (!idToAppIdCache.containsKey(id)) {
+            primeAppIds();
+        }
+        return idToAppIdCache.get(id);
+    }
+
+    @Override
+    public ApplicationId getAppId(String name) {
+        ApplicationId appId = nameToAppIdCache.computeIfAbsent(name, key -> {
+            Versioned<ApplicationId> existingAppId = registeredIds.get(key);
+            return existingAppId != null ? existingAppId.value() : null;
+        });
+        if (appId != null) {
+            idToAppIdCache.putIfAbsent(appId.id(), appId);
+        }
+        return appId;
+    }
+
+    @Override
+    public ApplicationId registerApplication(String name) {
+        ApplicationId appId = nameToAppIdCache.computeIfAbsent(name, key -> {
+            Versioned<ApplicationId> existingAppId = registeredIds.get(name);
+            if (existingAppId == null) {
+                int id = (int) appIdCounter.incrementAndGet();
+                DefaultApplicationId newAppId = new DefaultApplicationId(id, name);
+                existingAppId = registeredIds.putIfAbsent(name, newAppId);
+                if (existingAppId != null) {
+                    return existingAppId.value();
+                } else {
+                    return newAppId;
+                }
+            } else {
+                return existingAppId.value();
+            }
+        });
+        idToAppIdCache.putIfAbsent(appId.id(), appId);
+        return appId;
+    }
+
+    private void primeAppIds() {
+        registeredIds.values()
+                     .stream()
+                     .map(Versioned::value)
+                     .forEach(appId -> {
+                         nameToAppIdCache.putIfAbsent(appId.name(), appId);
+                         idToAppIdCache.putIfAbsent(appId.id(), appId);
+                     });
+    }
+}

@@ -44,7 +44,7 @@ import java.util.concurrent.ConcurrentHashMap;
  * Simple implementation of the application ID registry using in-memory
  * structures.
  */
-@Component(immediate = true)
+@Component(immediate = false, enabled = false)
 @Service
 public class DistributedApplicationIdStore
         extends AbstractHazelcastStore<AppIdEvent, AppIdStoreDelegate>