chrome/browser/chromeos/settings/shutdown_policy_handler.h

   1 // Copyright (c) 2014 The Chromium 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 #ifndef CHROME_BROWSER_CHROMEOS_SETTINGS_SHUTDOWN_POLICY_HANDLER_H_
   6 #define CHROME_BROWSER_CHROMEOS_SETTINGS_SHUTDOWN_POLICY_HANDLER_H_
   7
   8 #include "base/callback_forward.h"
   9 #include "base/macros.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "chrome/browser/chromeos/settings/cros_settings.h"
  13
  14 namespace chromeos {
  15
  16 // This class observes the device setting |DeviceRebootOnShutdown|. Changes to
  17 // this policy are communicated to the ShutdownPolicyHandler::Delegate by
  18 // calling its OnShutdownPolicyChanged method with the new state of the policy.
  19 class ShutdownPolicyHandler {
  20  public:
  21   // This callback is passed to CheckIfRebootOnShutdown, which invokes it with
  22   // the current state of the |DeviceRebootOnShutdown| policy once a trusted of
  23   // policies is established.
  24   using RebootOnShutdownCallback = base::Callback<void(bool)>;
  25
  26   // This delegate is called when the |DeviceRebootOnShutdown| policy changes.
  27   class Delegate {
  28    public:
  29     virtual void OnShutdownPolicyChanged(bool reboot_on_shutdown) = 0;
  30
  31    protected:
  32     virtual ~Delegate() {}
  33   };
  34
  35   ShutdownPolicyHandler(CrosSettings* cros_settings, Delegate* delegate);
  36   ~ShutdownPolicyHandler();
  37
  38   // Once a trusted set of policies is established, this function calls
  39   // |callback| with the trusted state of the |DeviceRebootOnShutdown| policy.
  40   void CheckIfRebootOnShutdown(const RebootOnShutdownCallback& callback);
  41
  42   // Resets the policy subscription and clears the delegate.
  43   void Shutdown();
  44
  45  private:
  46   void CallDelegate(bool reboot_on_shutdown);
  47
  48   void OnShutdownPolicyChanged();
  49
  50   CrosSettings* cros_settings_;
  51
  52   Delegate* delegate_;
  53
  54   scoped_ptr<CrosSettings::ObserverSubscription> shutdown_policy_subscription_;
  55
  56   base::WeakPtrFactory<ShutdownPolicyHandler> weak_factory_;
  57
  58   DISALLOW_COPY_AND_ASSIGN(ShutdownPolicyHandler);
  59 };
  60
  61 }  // namespace chromeos
  62
  63 #endif  // CHROME_BROWSER_CHROMEOS_SETTINGS_SHUTDOWN_POLICY_HANDLER_H_