[ONOS-7831] Implement GnmiHandshaker
Change-Id: I2232a724a86955483321f9fda571907aa2cb615a
(cherry picked from commit a884274c5796e6d8e6a58743d2d7f5ef47124b78)
diff --git a/protocols/grpc/api/src/main/java/org/onosproject/grpc/api/GrpcClientController.java b/protocols/grpc/api/src/main/java/org/onosproject/grpc/api/GrpcClientController.java
index 087898b..2e3ea5d 100644
--- a/protocols/grpc/api/src/main/java/org/onosproject/grpc/api/GrpcClientController.java
+++ b/protocols/grpc/api/src/main/java/org/onosproject/grpc/api/GrpcClientController.java
@@ -66,11 +66,12 @@
* Check reachability of the gRPC server running on the given device.
* Reachability can be tested only if a client is previously created
* using {@link #createClient(GrpcClientKey)}.
- * Different gRPC service may have different ways to test if it is
- * reachable or not.
+ * Note that this only checks the reachability instead of checking service
+ * availability, different gRPC client checks service availability with
+ * different way.
*
* @param deviceId the device identifier
- * @return true of client was created and is able to contact the gNMI server;
+ * @return true if client was created and is able to contact the gNMI server;
* false otherwise
*/
boolean isReachable(DeviceId deviceId);