def preflight(self, program, start, stop, resolution=None,<EOL>max_delay=None):
params = self._get_params(start=start, stop=stop,<EOL>resolution=resolution,<EOL>maxDelay=max_delay)<EOL>def exec_fn(since=None):<EOL><INDENT>if since:<EOL><INDENT>params['<STR_LIT:start>'] = since<EOL><DEDENT>return self._transport.preflight(program, params)<EOL><DEDENT>c = computation.Computation(exec_fn)<EOL>self._computations.add(c)<EOL>return c<EOL>
Preflight the given SignalFlow program and stream the output
         back.