Add a set of interfaces for k8s pod, service, endpoint

Change-Id: Ie67c5d1a0678bdd651dac24363ab3feab5098919
diff --git a/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sServiceStore.java b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sServiceStore.java
new file mode 100644
index 0000000..4fb5d62
--- /dev/null
+++ b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sServiceStore.java
@@ -0,0 +1,70 @@
+/*
+ * 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.api;
+
+import io.fabric8.kubernetes.api.model.Service;
+import org.onosproject.store.Store;
+
+import java.util.Set;
+
+/**
+ * Manages inventory of kubernetes service; not intended for direct use.
+ */
+public interface K8sServiceStore
+        extends Store<K8sServiceEvent, K8sServiceStoreDelegate> {
+
+    /**
+     * Creates the new kubernetes service.
+     *
+     * @param service kubernetes service
+     */
+    void createService(Service service);
+
+    /**
+     * Updates the kubernetes service.
+     *
+     * @param service kubernetes service
+     */
+    void updateService(Service service);
+
+    /**
+     * Removes the kubernetes service with the given service UID.
+     *
+     * @param uid kubernetes service UID
+     * @return removed kubernetes service; null if failed
+     */
+    Service removeService(String uid);
+
+    /**
+     * Returns the kubernetes service with the given service UID.
+     *
+     * @param uid kubernetes service UID
+     * @return kubernetes service; null if not found
+     */
+    Service service(String uid);
+
+    /**
+     * Returns all kubernetes services.
+     *
+     * @return set of kubernetes services
+     */
+    Set<Service> services();
+
+    /**
+     * Removes all kubernetes services.
+     */
+    void clear();
+}