Device config synchronizer

- initial sketch of Device Config Synchronizer outline (ONOS-6745)

Change-Id: I57c8ab6c3511f12c15e3501aa61498eb18264b27
diff --git a/apps/configsync/src/main/java/org/onosproject/d/config/sync/DeviceConfigSynchronizationProvider.java b/apps/configsync/src/main/java/org/onosproject/d/config/sync/DeviceConfigSynchronizationProvider.java
new file mode 100644
index 0000000..eed008f
--- /dev/null
+++ b/apps/configsync/src/main/java/org/onosproject/d/config/sync/DeviceConfigSynchronizationProvider.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2017-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.d.config.sync;
+
+import java.util.concurrent.CompletableFuture;
+
+import org.onosproject.d.config.sync.operation.SetRequest;
+import org.onosproject.d.config.sync.operation.SetResponse;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.provider.Provider;
+
+import com.google.common.annotations.Beta;
+
+// TODO might want to remove Device~ prefix, class name too long.
+/**
+ * Abstraction of a device config synchronization provider.
+ * <p>
+ * Provides a mean for propagating dynamic config triggered change down to
+ * the device.
+ */
+@Beta
+public interface DeviceConfigSynchronizationProvider extends Provider {
+
+    // TODO API to propagate dynamic config subsystem side change down to the
+    // device
+
+    /**
+     * Requests a device to set configuration as specified.
+     *
+     * @param deviceId target Device identifier
+     * @param request configuration requests
+     * @return result
+     */
+    CompletableFuture<SetResponse> setConfiguration(DeviceId deviceId, SetRequest request);
+
+    // TODO API for Get from Device
+    // CompletableFuture<GetResponse> getConfiguration(DeviceId deviceId, GetRequest request);
+
+}