[ONOS-7910] Add initial implementation for k8s flow rule manager

Change-Id: I4a419194b9e626d15be5c93b70af0d4c5005d814
diff --git a/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sFlowRuleService.java b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sFlowRuleService.java
new file mode 100644
index 0000000..8069adf
--- /dev/null
+++ b/apps/k8s-networking/api/src/main/java/org/onosproject/k8snetworking/api/K8sFlowRuleService.java
@@ -0,0 +1,59 @@
+/*
+ * 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 org.onosproject.core.ApplicationId;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.flow.TrafficTreatment;
+
+/**
+ * Service for setting flow rules.
+ */
+public interface K8sFlowRuleService {
+
+    /**
+     * Configure the flow rule.
+     *
+     * @param appId         application ID
+     * @param deviceId      device ID
+     * @param selector      traffic selector used for match header fields
+     * @param treatment     traffic treatment for take actions for matched packets
+     * @param priority      rule priority
+     * @param tableType     table number to install flow rules
+     * @param install       true for rule addition, false for rule removal
+     */
+    void setRule(ApplicationId appId, DeviceId deviceId,
+                 TrafficSelector selector, TrafficTreatment treatment,
+                 int priority, int tableType, boolean install);
+
+    /**
+     * Installs table miss entry (drop rule) for the given flow table.
+     *
+     * @param deviceId      device ID
+     * @param table         table number
+     */
+    void setUpTableMissEntry(DeviceId deviceId, int table);
+
+    /**
+     * Installs a flow rule for transiting from table A to table B.
+     *
+     * @param deviceId      device ID
+     * @param fromTable     table number of table A
+     * @param toTable       table number of table B
+     */
+    void connectTables(DeviceId deviceId, int fromTable, int toTable);
+}