1# Copyright 2015 The Chromium OS Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5"""An adapter to remotely access the system facade on DUT."""
6
7
8class SystemFacadeRemoteAdapter(object):
9    """SystemFacadeRemoteAdapter is an adapter to remotely control DUT system.
10
11    The Autotest host object representing the remote DUT, passed to this
12    class on initialization, can be accessed from its _client property.
13
14    """
15    def __init__(self, host, remote_facade_proxy):
16        """Construct an SystemFacadeRemoteAdapter.
17
18        @param host: Host object representing a remote host.
19        @param remote_facade_proxy: RemoteFacadeProxy object.
20
21        """
22        self._client = host
23        self._proxy = remote_facade_proxy
24
25
26    @property
27    def _system_proxy(self):
28        """Gets the proxy to DUT system facade.
29
30        @return XML RPC proxy to DUT system facade.
31
32        """
33        return self._proxy.system
34
35
36    def set_scaling_governor_mode(self, index, mode):
37        """Set mode of CPU scaling governor on one CPU of DUT.
38
39        @param index: CPU index starting from 0.
40
41        @param mode: Mode of scaling governor, accept 'interactive' or
42                     'performance'.
43
44        @returns: The original mode.
45
46        """
47        return self._system_proxy.set_scaling_governor_mode(index, mode)
48