VPP-205: documentation update

Change-Id: I98e5bdbd0472c2973885defe2712b53d9da8a536
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/vpp-api/java/jvpp-registry/org/openvpp/jvpp/JVppRegistry.java b/vpp-api/java/jvpp-registry/org/openvpp/jvpp/JVppRegistry.java
index c25b6536bb1..4515bb3fc20 100644
--- a/vpp-api/java/jvpp-registry/org/openvpp/jvpp/JVppRegistry.java
+++ b/vpp-api/java/jvpp-registry/org/openvpp/jvpp/JVppRegistry.java
@@ -62,8 +62,15 @@ public interface JVppRegistry extends AutoCloseable {
     /**
      * Sends control ping. Reply handler calls callback registered for give plugin.
      *
+     * Control ping is used for initial RX thread to Java thread attachment
+     * that takes place in the plugin's JNI lib
+     * and to wrap dump message replies in one list.
+     *
+     * VPP plugins don't have to provide special control ping, therefore
+     * it is necessary to providing control ping support in JVppRegistry.
+
      * @param clazz identifies plugin that should receive ping callback
-     * @return unique identifer of message in message queue
+     * @return unique identifier of message in message queue
      */
     int controlPing(final Class<? extends JVpp> clazz) throws VppInvocationException;
 }