[ONOS-7902] Add default implementation of k8s node with unit tests
Change-Id: I283967ae14dc7f38e749d7407e4bec698536c18b
diff --git a/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/impl/DistributedK8sNodeStore.java b/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/impl/DistributedK8sNodeStore.java
new file mode 100644
index 0000000..15d2697
--- /dev/null
+++ b/apps/k8s-node/app/src/main/java/org/onosproject/k8snode/impl/DistributedK8sNodeStore.java
@@ -0,0 +1,201 @@
+/*
+ * 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.k8snode.impl;
+
+import com.google.common.collect.ImmutableSet;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.k8snode.api.DefaultK8sNode;
+import org.onosproject.k8snode.api.K8sNode;
+import org.onosproject.k8snode.api.K8sNodeEvent;
+import org.onosproject.k8snode.api.K8sNodeState;
+import org.onosproject.k8snode.api.K8sNodeStore;
+import org.onosproject.k8snode.api.K8sNodeStoreDelegate;
+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.k8snode.api.K8sNodeEvent.Type.K8S_NODE_COMPLETE;
+import static org.onosproject.k8snode.api.K8sNodeEvent.Type.K8S_NODE_CREATED;
+import static org.onosproject.k8snode.api.K8sNodeEvent.Type.K8S_NODE_INCOMPLETE;
+import static org.onosproject.k8snode.api.K8sNodeEvent.Type.K8S_NODE_REMOVED;
+import static org.onosproject.k8snode.api.K8sNodeEvent.Type.K8S_NODE_UPDATED;
+import static org.onosproject.k8snode.api.K8sNodeState.COMPLETE;
+import static org.onosproject.k8snode.api.K8sNodeState.INCOMPLETE;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Implementation of kubernetes node store using consistent map.
+ */
+@Component(immediate = true, service = K8sNodeStore.class)
+public class DistributedK8sNodeStore
+ extends AbstractStore<K8sNodeEvent, K8sNodeStoreDelegate>
+ implements K8sNodeStore {
+
+ 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.k8snode";
+
+ private static final KryoNamespace
+ SERIALIZER_K8S_NODE = KryoNamespace.newBuilder()
+ .register(KryoNamespaces.API)
+ .register(K8sNode.class)
+ .register(DefaultK8sNode.class)
+ .register(K8sNode.Type.class)
+ .register(K8sNodeState.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, K8sNode> nodeMapListener =
+ new K8sNodeMapListener();
+ private ConsistentMap<String, K8sNode> nodeStore;
+
+ @Activate
+ protected void activate() {
+ ApplicationId appId = coreService.registerApplication(APP_ID);
+ nodeStore = storageService.<String, K8sNode>consistentMapBuilder()
+ .withSerializer(Serializer.using(SERIALIZER_K8S_NODE))
+ .withName("k8s-nodestore")
+ .withApplicationId(appId)
+ .build();
+ nodeStore.addListener(nodeMapListener);
+ log.info("Started");
+ }
+
+ @Deactivate
+ protected void deactivate() {
+ nodeStore.removeListener(nodeMapListener);
+ eventExecutor.shutdown();
+ log.info("Stopped");
+ }
+
+ @Override
+ public void createNode(K8sNode node) {
+ nodeStore.compute(node.hostname(), (hostname, existing) -> {
+ final String error = node.hostname() + ERR_DUPLICATE;
+ checkArgument(existing == null, error);
+ return node;
+ });
+ }
+
+ @Override
+ public void updateNode(K8sNode node) {
+ nodeStore.compute(node.hostname(), (hostname, existing) -> {
+ final String error = node.hostname() + ERR_NOT_FOUND;
+ checkArgument(existing != null, error);
+ return node;
+ });
+ }
+
+ @Override
+ public K8sNode removeNode(String hostname) {
+ Versioned<K8sNode> node = nodeStore.remove(hostname);
+ if (node == null) {
+ final String error = hostname + ERR_NOT_FOUND;
+ throw new IllegalArgumentException(error);
+ }
+ return node.value();
+ }
+
+ @Override
+ public Set<K8sNode> nodes() {
+ return ImmutableSet.copyOf(nodeStore.asJavaMap().values());
+ }
+
+ @Override
+ public K8sNode node(String hostname) {
+ return nodeStore.asJavaMap().get(hostname);
+ }
+
+ private class K8sNodeMapListener
+ implements MapEventListener<String, K8sNode> {
+
+ @Override
+ public void event(MapEvent<String, K8sNode> event) {
+
+ switch (event.type()) {
+ case INSERT:
+ log.debug("Kubernetes node created {}", event.newValue());
+ eventExecutor.execute(() ->
+ notifyDelegate(new K8sNodeEvent(
+ K8S_NODE_CREATED, event.newValue().value()
+ )));
+ break;
+ case UPDATE:
+ log.debug("Kubernetes node updated {}", event.newValue());
+ eventExecutor.execute(() -> {
+ notifyDelegate(new K8sNodeEvent(
+ K8S_NODE_UPDATED,
+ event.newValue().value()
+ ));
+
+ if (event.newValue().value().state() == COMPLETE) {
+ notifyDelegate(new K8sNodeEvent(
+ K8S_NODE_COMPLETE,
+ event.newValue().value()
+ ));
+ } else if (event.newValue().value().state() == INCOMPLETE) {
+ notifyDelegate(new K8sNodeEvent(
+ K8S_NODE_INCOMPLETE,
+ event.newValue().value()
+ ));
+ }
+ });
+ break;
+ case REMOVE:
+ log.debug("Kubernetes node removed {}", event.oldValue());
+ eventExecutor.execute(() ->
+ notifyDelegate(new K8sNodeEvent(
+ K8S_NODE_REMOVED, event.oldValue().value()
+ )));
+ break;
+ default:
+ // do nothing
+ break;
+ }
+ }
+ }
+}