1 //
2 // Copyright (C) 2012 The Android Open Source Project
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 //      http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16 
17 #ifndef UPDATE_ENGINE_SYSTEM_STATE_H_
18 #define UPDATE_ENGINE_SYSTEM_STATE_H_
19 
20 namespace chromeos_update_manager {
21 
22 class UpdateManager;
23 
24 }  // namespace chromeos_update_manager
25 
26 namespace policy {
27 
28 class DevicePolicy;
29 
30 }  // namespace policy
31 
32 namespace chromeos_update_engine {
33 
34 // SystemState is the root class within the update engine. So we should avoid
35 // any circular references in header file inclusion. Hence forward-declaring
36 // the required classes.
37 class BootControlInterface;
38 class ClockInterface;
39 class ConnectionManagerInterface;
40 class DlcServiceInterface;
41 class HardwareInterface;
42 class MetricsReporterInterface;
43 class OmahaRequestParams;
44 class P2PManager;
45 class PayloadStateInterface;
46 class PowerManagerInterface;
47 class PrefsInterface;
48 class UpdateAttempter;
49 
50 // An interface to global system context, including platform resources,
51 // the current state of the system, high-level objects whose lifetime is same
52 // as main, system interfaces, etc.
53 // Carved out separately so it can be mocked for unit tests.
54 // Currently it has only one method, but we should start migrating other
55 // methods to use this as and when needed to unit test them.
56 // TODO(jaysri): Consider renaming this to something like GlobalContext.
57 class SystemState {
58  public:
59   // Destructs this object.
60   virtual ~SystemState() {}
61 
62   // Sets or gets the latest device policy.
63   virtual void set_device_policy(const policy::DevicePolicy* device_policy) = 0;
64   virtual const policy::DevicePolicy* device_policy() = 0;
65 
66   // Gets the interface object for the bootloader control interface.
67   virtual BootControlInterface* boot_control() = 0;
68 
69   // Gets the interface object for the clock.
70   virtual ClockInterface* clock() = 0;
71 
72   // Gets the connection manager object.
73   virtual ConnectionManagerInterface* connection_manager() = 0;
74 
75   // Gets the hardware interface object.
76   virtual HardwareInterface* hardware() = 0;
77 
78   // Gets the Metrics Library interface for reporting UMA stats.
79   virtual MetricsReporterInterface* metrics_reporter() = 0;
80 
81   // Gets the interface object for persisted store.
82   virtual PrefsInterface* prefs() = 0;
83 
84   // Gets the interface object for the persisted store that persists across
85   // powerwashes. Please note that this should be used very seldomly and must
86   // be forwards and backwards compatible as powerwash is used to go back and
87   // forth in system versions.
88   virtual PrefsInterface* powerwash_safe_prefs() = 0;
89 
90   // Gets the interface for the payload state object.
91   virtual PayloadStateInterface* payload_state() = 0;
92 
93   // Returns a pointer to the update attempter object.
94   virtual UpdateAttempter* update_attempter() = 0;
95 
96   // Returns a pointer to the object that stores the parameters that are
97   // common to all Omaha requests.
98   virtual OmahaRequestParams* request_params() = 0;
99 
100   // Returns a pointer to the P2PManager singleton.
101   virtual P2PManager* p2p_manager() = 0;
102 
103   // Returns a pointer to the UpdateManager singleton.
104   virtual chromeos_update_manager::UpdateManager* update_manager() = 0;
105 
106   // Gets the power manager object. Mocked during test.
107   virtual PowerManagerInterface* power_manager() = 0;
108 
109   // If true, this is the first instance of the update engine since the system
110   // restarted. Important for tracking whether you are running instance of the
111   // update engine on first boot or due to a crash/restart.
112   virtual bool system_rebooted() = 0;
113 
114   // Returns a pointer to the DlcServiceInterface singleton.
115   virtual DlcServiceInterface* dlcservice() = 0;
116 };
117 
118 }  // namespace chromeos_update_engine
119 
120 #endif  // UPDATE_ENGINE_SYSTEM_STATE_H_
121