[ONOS-6248] VPLS refactoring

Change-Id: I8ffb2199ca108ad8dfe271681068636fc4af2a40
diff --git a/apps/vpls/src/main/java/org/onosproject/vpls/api/VplsOperationService.java b/apps/vpls/src/main/java/org/onosproject/vpls/api/VplsOperationService.java
new file mode 100644
index 0000000..3044f7e
--- /dev/null
+++ b/apps/vpls/src/main/java/org/onosproject/vpls/api/VplsOperationService.java
@@ -0,0 +1,30 @@
+/*
+ * 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.vpls.api;
+
+/**
+ * Service for application submitting VPLS operation.
+ */
+public interface VplsOperationService {
+
+    /**
+     * Submits a VPLS operation.
+     *
+     * @param vplsOperation the VPLS operation to submit
+     */
+    void submit(VplsOperation vplsOperation);
+}