code: private void initializeRpcPlugins(final String[] pluginClassNames,
          final ImmutableList.Builder<RpcPlugin> rpcs) {
      for (final String plugin : pluginClassNames) {
        final RpcPlugin rpc = createAndInitialize(plugin, RpcPlugin.class);
        rpcs.add(rpc);
      }
    }
docs: Load and init the {@link RpcPlugin}s provided as an array of
  {@code pluginClassNames}.
  @param pluginClassNames fully-qualified class names that are
  instances of {@link RpcPlugin}s
  @param rpcs a list of loaded and initialized plugins