[ONOS-7935] Add k8s pod store and manager with unit tests
Change-Id: If4104a2800556bf9777c159eb3b5bd175bc141ae
diff --git a/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sPodManager.java b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sPodManager.java
new file mode 100644
index 0000000..0f2c8ae
--- /dev/null
+++ b/apps/k8s-networking/app/src/main/java/org/onosproject/k8snetworking/impl/K8sPodManager.java
@@ -0,0 +1,162 @@
+/*
+ * 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.Pod;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.event.ListenerRegistry;
+import org.onosproject.k8snetworking.api.K8sPodAdminService;
+import org.onosproject.k8snetworking.api.K8sPodEvent;
+import org.onosproject.k8snetworking.api.K8sPodListener;
+import org.onosproject.k8snetworking.api.K8sPodService;
+import org.onosproject.k8snetworking.api.K8sPodStore;
+import org.onosproject.k8snetworking.api.K8sPodStoreDelegate;
+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 pod.
+ */
+@Component(
+ immediate = true,
+ service = {K8sPodAdminService.class, K8sPodService.class}
+)
+public class K8sPodManager
+ extends ListenerRegistry<K8sPodEvent, K8sPodListener>
+ implements K8sPodAdminService, K8sPodService {
+
+ protected final Logger log = getLogger(getClass());
+
+ private static final String MSG_POD = "Kubernetes pod %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_POD = "Kubernetes pod cannot be null";
+ private static final String ERR_NULL_POD_UID = "Kubernetes pod 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 K8sPodStore k8sPodStore;
+
+ private final K8sPodStoreDelegate delegate = new InternalPodStorageDelegate();
+
+ private ApplicationId appId;
+
+ @Activate
+ protected void activate() {
+ appId = coreService.registerApplication(K8S_NETWORKING_APP_ID);
+
+ k8sPodStore.setDelegate(delegate);
+ log.info("Started");
+ }
+
+ @Deactivate
+ protected void deactivate() {
+ k8sPodStore.unsetDelegate(delegate);
+ log.info("Stopped");
+ }
+
+ @Override
+ public void createPod(Pod pod) {
+ checkNotNull(pod, ERR_NULL_POD);
+ checkArgument(!Strings.isNullOrEmpty(pod.getMetadata().getUid()),
+ ERR_NULL_POD_UID);
+
+ k8sPodStore.createPod(pod);
+
+ log.info(String.format(MSG_POD, pod.getMetadata().getName(), MSG_CREATED));
+ }
+
+ @Override
+ public void updatePod(Pod pod) {
+ checkNotNull(pod, ERR_NULL_POD);
+ checkArgument(!Strings.isNullOrEmpty(pod.getMetadata().getUid()),
+ ERR_NULL_POD_UID);
+
+ k8sPodStore.updatePod(pod);
+
+ log.info(String.format(MSG_POD, pod.getMetadata().getName(), MSG_UPDATED));
+ }
+
+ @Override
+ public void removePod(String uid) {
+ checkArgument(!Strings.isNullOrEmpty(uid), ERR_NULL_POD_UID);
+
+ synchronized (this) {
+ if (isPodInUse(uid)) {
+ final String error = String.format(MSG_POD, uid, ERR_IN_USE);
+ throw new IllegalStateException(error);
+ }
+
+ Pod pod = k8sPodStore.removePod(uid);
+
+ if (pod != null) {
+ log.info(String.format(MSG_POD,
+ pod.getMetadata().getName(), MSG_REMOVED));
+ }
+ }
+ }
+
+ @Override
+ public void clear() {
+ k8sPodStore.clear();
+ }
+
+ @Override
+ public Pod pod(String uid) {
+ checkArgument(!Strings.isNullOrEmpty(uid), ERR_NULL_POD_UID);
+ return k8sPodStore.pod(uid);
+ }
+
+ @Override
+ public Set<Pod> pods() {
+ return ImmutableSet.copyOf(k8sPodStore.pods());
+ }
+
+ private boolean isPodInUse(String uid) {
+ return false;
+ }
+
+ private class InternalPodStorageDelegate implements K8sPodStoreDelegate {
+
+ @Override
+ public void notify(K8sPodEvent event) {
+ if (event != null) {
+ log.trace("send kubernetes pod event {}", event);
+ process(event);
+ }
+ }
+ }
+}