[ONOS-6137] Refactoring SecurityGroup features for stateful SONA

- Caches the security group information
- Supports seucrity group & rules update

Change-Id: Id7cdfb84e53e00aab49fbe736fb39e37492eeb61
diff --git a/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/api/OpenstackSecurityGroupStore.java b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/api/OpenstackSecurityGroupStore.java
new file mode 100644
index 0000000..f4c02a4
--- /dev/null
+++ b/apps/openstacknetworking/src/main/java/org/onosproject/openstacknetworking/api/OpenstackSecurityGroupStore.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * 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.openstacknetworking.api;
+
+import org.onosproject.store.Store;
+import org.openstack4j.model.network.SecurityGroup;
+import org.openstack4j.model.network.SecurityGroupRule;
+
+/**
+ * Manages inventory of OpenStack security group states; not intended for direct use.
+ */
+public interface OpenstackSecurityGroupStore
+        extends Store<OpenstackSecurityGroupEvent, OpenstackSecurityGroupStoreDelegate> {
+
+    /**
+     * Creates a security group.
+     *
+     * @param sg security group
+     */
+    void createSecurityGroup(SecurityGroup sg);
+
+    /**
+     * Updates the security group with the security group ID with the security group object.
+     *
+     * @param sgId security group ID
+     * @param sg new SecurityGroup object
+     * @return old SecurityGroup object
+     */
+    SecurityGroup updateSecurityGroup(String sgId, SecurityGroup sg);
+
+    /**
+     * Removes the security group with the security group ID.
+     *
+     * @param sgId security group Id
+     * @return SecurityGroup object removed
+     */
+    SecurityGroup removeSecurityGroup(String sgId);
+
+    /**
+     * Creates a security group rule.
+     *
+     * @param sgRule security group rule
+     */
+    void createSecurityGroupRule(SecurityGroupRule sgRule);
+
+    /**
+     * Removes the security group rule with the security group rule ID.
+     *
+     * @param sgRuleId security group rule ID to remove
+     * @return SecurityGroupRule object removed
+     */
+    SecurityGroupRule removeSecurityGroupRule(String sgRuleId);
+
+    /**
+     * Returns the security group with the security group ID.
+     *
+     * @param sgId security group ID
+     * @return Security Group
+     */
+    SecurityGroup securityGroup(String sgId);
+
+    /**
+     * Returns the security group rule with the security group ID.
+     *
+     * @param sgRuleId security group rule ID
+     * @return Security Group Rule
+     */
+    SecurityGroupRule securityGroupRule(String sgRuleId);
+
+}