@Override
    protected long startAttempt(ConnectionStats stats) {
      return stats.startGatewayBatch();
    }
Attempts to read a response to this operation by reading it from the given connection, and
returning it.

@param cnx the connection to read the response from
@return the result of the operation or <code>null</code> if the operation has no result.
@throws Exception if the execute failed
geode-wan/src/main/java/org/apache/geode/cache/wan/internal/client/locator/GatewaySenderBatchOp.java