[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/K8sServiceManager.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sServiceManager.java
new file mode 100644
index 0000000..fd18c7e
--- /dev/null
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sServiceManager.java
@@ -0,0 +1,163 @@
+/*
+ * 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.base.Strings;
+import com.google.common.collect.ImmutableSet;
+import io.fabric8.kubernetes.api.model.Service;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.event.ListenerRegistry;
+import org.onosproject.k8snetworking.api.K8sServiceAdminService;
+import org.onosproject.k8snetworking.api.K8sServiceEvent;
+import org.onosproject.k8snetworking.api.K8sServiceListener;
+import org.onosproject.k8snetworking.api.K8sServiceService;
+import org.onosproject.k8snetworking.api.K8sServiceStore;
+import org.onosproject.k8snetworking.api.K8sServiceStoreDelegate;
+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.Set;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onosproject.k8snetworking.api.Constants.K8S_NETWORKING_APP_ID;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Provides implementation of administering and interfacing kubernetes service.
+ */
+@Component(
+ immediate = true,
+ service = {K8sServiceAdminService.class, K8sServiceService.class}
+)
+public class K8sServiceManager
+ extends ListenerRegistry<K8sServiceEvent, K8sServiceListener>
+ implements K8sServiceAdminService, K8sServiceService {
+
+ protected final Logger log = getLogger(getClass());
+
+ private static final String MSG_SERVICE = "Kubernetes service %s %s";
+ private static final String MSG_CREATED = "created";
+ private static final String MSG_UPDATED = "updated";
+ private static final String MSG_REMOVED = "removed";
+
+ private static final String ERR_NULL_SERVICE = "Kubernetes service cannot be null";
+ private static final String ERR_NULL_SERVICE_UID = "Kubernetes service UID cannot be null";
+
+ private static final String ERR_IN_USE = " still in use";
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected CoreService coreService;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY)
+ protected K8sServiceStore k8sServiceStore;
+
+ private final K8sServiceStoreDelegate
+ delegate = new InternalServiceStorageDelegate();
+
+ private ApplicationId appId;
+
+ @Activate
+ protected void activate() {
+ appId = coreService.registerApplication(K8S_NETWORKING_APP_ID);
+
+ k8sServiceStore.setDelegate(delegate);
+ log.info("Started");
+ }
+
+ @Deactivate
+ protected void deactivate() {
+ k8sServiceStore.unsetDelegate(delegate);
+ log.info("Stopped");
+ }
+
+ @Override
+ public void createService(Service service) {
+ checkNotNull(service, ERR_NULL_SERVICE);
+ checkArgument(!Strings.isNullOrEmpty(service.getMetadata().getUid()),
+ ERR_NULL_SERVICE_UID);
+
+ k8sServiceStore.createService(service);
+
+ log.info(String.format(MSG_SERVICE, service.getMetadata().getName(), MSG_CREATED));
+ }
+
+ @Override
+ public void updateService(Service service) {
+ checkNotNull(service, ERR_NULL_SERVICE);
+ checkArgument(!Strings.isNullOrEmpty(service.getMetadata().getUid()),
+ ERR_NULL_SERVICE_UID);
+
+ k8sServiceStore.updateService(service);
+
+ log.info(String.format(MSG_SERVICE, service.getMetadata().getName(), MSG_UPDATED));
+ }
+
+ @Override
+ public void removeService(String uid) {
+ checkArgument(!Strings.isNullOrEmpty(uid), ERR_NULL_SERVICE_UID);
+
+ synchronized (this) {
+ if (isServiceInUse(uid)) {
+ final String error = String.format(MSG_SERVICE, uid, ERR_IN_USE);
+ throw new IllegalStateException(error);
+ }
+
+ Service service = k8sServiceStore.removeService(uid);
+
+ if (service != null) {
+ log.info(String.format(MSG_SERVICE,
+ service.getMetadata().getName(), MSG_REMOVED));
+ }
+ }
+ }
+
+ @Override
+ public void clear() {
+ k8sServiceStore.clear();
+ }
+
+ @Override
+ public Service service(String uid) {
+ checkArgument(!Strings.isNullOrEmpty(uid), ERR_NULL_SERVICE_UID);
+ return k8sServiceStore.service(uid);
+ }
+
+ @Override
+ public Set<Service> services() {
+ return ImmutableSet.copyOf(k8sServiceStore.services());
+ }
+
+ private boolean isServiceInUse(String uid) {
+ return false;
+ }
+
+ private class InternalServiceStorageDelegate implements K8sServiceStoreDelegate {
+
+ @Override
+ public void notify(K8sServiceEvent event) {
+ if (event != null) {
+ log.trace("send kubernetes service event {}", event);
+ process(event);
+ }
+ }
+ }
+}