+ /**
+ * Converts a message to a "pretty-printed" String using the operation's normal
+ * serialization provider (i.e., it's <i>coder</i>).
+ *
+ * @param message response to be logged
+ * @return the JSON text that was logged
+ * @throws IllegalArgumentException if the message cannot be converted
+ */
+ public <T> String prettyPrint(T message) {
+ if (message == null) {
+ return null;
+ } else if (message instanceof String) {
+ return message.toString();
+ } else {
+ try {
+ return getCoder().encode(message, true);
+ } catch (CoderException e) {
+ throw new IllegalArgumentException("cannot encode message", e);
+ }
+ }
+ }
+