code: public Request get_async_request(final int id) throws DevFailed {
  
  	if (!async_request_table.containsKey(id)) {
  	    Except.throw_exception("ASYNC_API_ERROR", "request for id " + id + " does not exist",
  		    this.getClass().getCanonicalName() + ".get_async_request");
  	}
  	final AsyncCallObject aco = async_request_table.get(id);
  	return aco.request;
      }
docs: ==========================================================================