[ONOS-7933] Add k8s service store and manager with unit tests

Change-Id: I18ffd491dc4cf979a350acd50d3c7b1599fc229a
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sServiceStore.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sServiceStore.java
new file mode 100644
index 0000000..116f535
--- /dev/null
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/DistributedK8sServiceStore.java
@@ -0,0 +1,187 @@
+/*
+ * Copyright 2019-present Open Networking Foundation
+ *
+ * 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.k8snetworking.impl;
+
+import com.google.common.collect.ImmutableSet;
+import io.fabric8.kubernetes.api.model.ObjectMeta;
+import io.fabric8.kubernetes.api.model.Service;
+import io.fabric8.kubernetes.api.model.ServiceSpec;
+import io.fabric8.kubernetes.api.model.ServiceStatus;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.k8snetworking.api.K8sServiceEvent;
+import org.onosproject.k8snetworking.api.K8sServiceStore;
+import org.onosproject.k8snetworking.api.K8sServiceStoreDelegate;
+import org.onosproject.store.AbstractStore;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.ConsistentMap;
+import org.onosproject.store.service.MapEvent;
+import org.onosproject.store.service.MapEventListener;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.Versioned;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.osgi.service.component.annotations.Reference;
+import org.osgi.service.component.annotations.ReferenceCardinality;
+import org.slf4j.Logger;
+
+import java.util.Collection;
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static java.util.concurrent.Executors.newSingleThreadExecutor;
+import static org.onlab.util.Tools.groupedThreads;
+import static org.onosproject.k8snetworking.api.K8sServiceEvent.Type.K8S_SERVICE_CREATED;
+import static org.onosproject.k8snetworking.api.K8sServiceEvent.Type.K8S_SERVICE_REMOVED;
+import static org.onosproject.k8snetworking.api.K8sServiceEvent.Type.K8S_SERVICE_UPDATED;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Implementation of kubernetes service store using consistent map.
+ */
+@Component(immediate = true, service = K8sServiceStore.class)
+public class DistributedK8sServiceStore
+        extends AbstractStore<K8sServiceEvent, K8sServiceStoreDelegate>
+        implements K8sServiceStore {
+
+    private final Logger log = getLogger(getClass());
+
+    private static final String ERR_NOT_FOUND = " does not exist";
+    private static final String ERR_DUPLICATE = " already exists";
+    private static final String APP_ID = "org.onosproject.k8snetwork";
+
+    private static final KryoNamespace
+            SERIALIZER_K8S_SERVICE = KryoNamespace.newBuilder()
+            .register(KryoNamespaces.API)
+            .register(Service.class)
+            .register(ObjectMeta.class)
+            .register(ServiceSpec.class)
+            .register(ServiceStatus.class)
+            .register(Collection.class)
+            .build();
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY)
+    protected StorageService storageService;
+
+    private final ExecutorService eventExecutor = newSingleThreadExecutor(
+            groupedThreads(this.getClass().getSimpleName(), "event-handler", log));
+
+    private final MapEventListener<String, Service> serviceMapListener =
+            new K8sServiceMapListener();
+
+    private ConsistentMap<String, Service> serviceStore;
+
+    @Activate
+    protected void activate() {
+        ApplicationId appId = coreService.registerApplication(APP_ID);
+        serviceStore = storageService.<String, Service>consistentMapBuilder()
+                .withSerializer(Serializer.using(SERIALIZER_K8S_SERVICE))
+                .withName("k8s-service-store")
+                .withApplicationId(appId)
+                .build();
+
+        serviceStore.addListener(serviceMapListener);
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        serviceStore.removeListener(serviceMapListener);
+        eventExecutor.shutdown();
+        log.info("Stopped");
+    }
+
+    @Override
+    public void createService(Service service) {
+        serviceStore.compute(service.getMetadata().getUid(), (uid, existing) -> {
+            final String error = service.getMetadata().getUid() + ERR_DUPLICATE;
+            checkArgument(existing == null, error);
+            return service;
+        });
+    }
+
+    @Override
+    public void updateService(Service service) {
+        serviceStore.compute(service.getMetadata().getUid(), (uid, existing) -> {
+            final String error = service.getMetadata().getUid() + ERR_NOT_FOUND;
+            checkArgument(existing != null, error);
+            return service;
+        });
+    }
+
+    @Override
+    public Service removeService(String uid) {
+        Versioned<Service> service = serviceStore.remove(uid);
+        if (service == null) {
+            final String error = uid + ERR_NOT_FOUND;
+            throw new IllegalArgumentException(error);
+        }
+        return service.value();
+    }
+
+    @Override
+    public Service service(String uid) {
+        return serviceStore.asJavaMap().get(uid);
+    }
+
+    @Override
+    public Set<Service> services() {
+        return ImmutableSet.copyOf(serviceStore.asJavaMap().values());
+    }
+
+    @Override
+    public void clear() {
+        serviceStore.clear();
+    }
+
+    private class K8sServiceMapListener implements MapEventListener<String, Service> {
+
+        @Override
+        public void event(MapEvent<String, Service> event) {
+
+            switch (event.type()) {
+                case INSERT:
+                    log.debug("Kubernetes service created {}", event.newValue());
+                    eventExecutor.execute(() ->
+                            notifyDelegate(new K8sServiceEvent(
+                                K8S_SERVICE_CREATED, event.newValue().value())));
+                    break;
+                case UPDATE:
+                    log.debug("Kubernetes service updated {}", event.newValue());
+                    eventExecutor.execute(() ->
+                            notifyDelegate(new K8sServiceEvent(
+                                    K8S_SERVICE_UPDATED, event.newValue().value())));
+                    break;
+                case REMOVE:
+                    log.debug("Kubernetes service removed {}", event.oldValue());
+                    eventExecutor.execute(() ->
+                            notifyDelegate(new K8sServiceEvent(
+                                    K8S_SERVICE_REMOVED, event.oldValue().value())));
+                    break;
+                default:
+                    // do nothing
+                    break;
+            }
+        }
+    }
+}