[ONOS-8014] Implement kubernetes namespace store and manager
Change-Id: I86200d9a49a7935738e6599829d297196ab50131
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sNamespaceManager.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sNamespaceManager.java
new file mode 100644
index 0000000..3a1e10c
--- /dev/null
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sNamespaceManager.java
@@ -0,0 +1,168 @@
+/*
+ * 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.Namespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.event.ListenerRegistry;
+import org.onosproject.k8snetworking.api.K8sNamespaceAdminService;
+import org.onosproject.k8snetworking.api.K8sNamespaceEvent;
+import org.onosproject.k8snetworking.api.K8sNamespaceListener;
+import org.onosproject.k8snetworking.api.K8sNamespaceService;
+import org.onosproject.k8snetworking.api.K8sNamespaceStore;
+import org.onosproject.k8snetworking.api.K8sNamespaceStoreDelegate;
+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 namespace.
+ */
+@Component(
+ immediate = true,
+ service = {K8sNamespaceAdminService.class, K8sNamespaceService.class}
+)
+public class K8sNamespaceManager
+ extends ListenerRegistry<K8sNamespaceEvent, K8sNamespaceListener>
+ implements K8sNamespaceAdminService, K8sNamespaceService {
+
+ protected final Logger log = getLogger(getClass());
+
+ private static final String MSG_NAMESPACE = "Kubernetes namespace %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_NAMESPACE = "Kubernetes namespace cannot be null";
+ private static final String
+ ERR_NULL_NAMESPACE_UID = "Kubernetes namespace 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 K8sNamespaceStore k8sNamespaceStore;
+
+ private final K8sNamespaceStoreDelegate delegate =
+ new InternalNamespaceStorageDelegate();
+
+ private ApplicationId appId;
+
+ @Activate
+ protected void activate() {
+ appId = coreService.registerApplication(K8S_NETWORKING_APP_ID);
+
+ k8sNamespaceStore.setDelegate(delegate);
+ log.info("Started");
+ }
+
+ @Deactivate
+ protected void deactivate() {
+ k8sNamespaceStore.unsetDelegate(delegate);
+ log.info("Stopped");
+ }
+
+ @Override
+ public void createNamespace(Namespace namespace) {
+ checkNotNull(namespace, ERR_NULL_NAMESPACE);
+ checkArgument(!Strings.isNullOrEmpty(namespace.getMetadata().getUid()),
+ ERR_NULL_NAMESPACE_UID);
+
+ k8sNamespaceStore.createNamespace(namespace);
+
+ log.info(String.format(MSG_NAMESPACE,
+ namespace.getMetadata().getName(), MSG_CREATED));
+ }
+
+ @Override
+ public void updateNamespace(Namespace namespace) {
+ checkNotNull(namespace, ERR_NULL_NAMESPACE);
+ checkArgument(!Strings.isNullOrEmpty(namespace.getMetadata().getUid()),
+ ERR_NULL_NAMESPACE_UID);
+
+ k8sNamespaceStore.updateNamespace(namespace);
+
+ log.info(String.format(MSG_NAMESPACE,
+ namespace.getMetadata().getName(), MSG_UPDATED));
+ }
+
+ @Override
+ public void removeNamespace(String uid) {
+ checkArgument(!Strings.isNullOrEmpty(uid), ERR_NULL_NAMESPACE_UID);
+
+ synchronized (this) {
+ if (isNamespaceInUse(uid)) {
+ final String error = String.format(MSG_NAMESPACE, uid, ERR_IN_USE);
+ throw new IllegalStateException(error);
+ }
+ }
+
+ Namespace namespace = k8sNamespaceStore.removeNamespace(uid);
+
+ if (namespace != null) {
+ log.info(String.format(MSG_NAMESPACE,
+ namespace.getMetadata().getName(), MSG_REMOVED));
+ }
+ }
+
+ @Override
+ public void clear() {
+ k8sNamespaceStore.clear();
+ }
+
+ @Override
+ public Namespace namespace(String uid) {
+ checkArgument(!Strings.isNullOrEmpty(uid), ERR_NULL_NAMESPACE_UID);
+ return k8sNamespaceStore.namespace(uid);
+ }
+
+ @Override
+ public Set<Namespace> namespaces() {
+ return ImmutableSet.copyOf(k8sNamespaceStore.namespaces());
+ }
+
+ private boolean isNamespaceInUse(String uid) {
+ return false;
+ }
+
+ private class InternalNamespaceStorageDelegate
+ implements K8sNamespaceStoreDelegate {
+
+ @Override
+ public void notify(K8sNamespaceEvent event) {
+ if (event != null) {
+ log.trace("send kubernetes namespace event {}", event);
+ process(event);
+ }
+ }
+ }
+}