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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_CHROMEOS_SESSION_LENGTH_LIMITER_H_
#define CHROME_BROWSER_CHROMEOS_SESSION_LENGTH_LIMITER_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/prefs/pref_change_registrar.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "ui/wm/core/user_activity_observer.h"
class PrefService;
class PrefRegistrySimple;
namespace chromeos {
// Enforces a session length limit by terminating the session when the limit is
// reached.
class SessionLengthLimiter : public wm::UserActivityObserver {
public:
class Delegate {
public:
virtual ~Delegate();
virtual const base::TimeTicks GetCurrentTime() const = 0;
virtual void StopSession() = 0;
};
// Registers preferences.
static void RegisterPrefs(PrefRegistrySimple* registry);
SessionLengthLimiter(Delegate* delegate, bool browser_restarted);
virtual ~SessionLengthLimiter();
// wm::UserActivityObserver:
virtual void OnUserActivity(const ui::Event* event) override;
private:
// Attempt to restore the session start time and the flag indicating user
// activity from local state. Return |true| if the restore is successful.
bool RestoreStateAfterCrash();
// Update the session start time if possible:
// * If instructed to wait for initial user activity, the session start time
// advances every time this method is called as long as no user activity has
// occurred yet. The time is not persisted in local state.
// * If instructed not to wait for initial user activity, the session start
// time is set and persisted in local state the first time this method is
// called.
// The pref indicating whether to wait for initial user activity may change at
// any time, switching between the two behaviors.
void UpdateSessionStartTime();
void UpdateLimit();
base::ThreadChecker thread_checker_;
scoped_ptr<Delegate> delegate_;
PrefChangeRegistrar pref_change_registrar_;
scoped_ptr<base::OneShotTimer<SessionLengthLimiter::Delegate> > timer_;
base::TimeTicks session_start_time_;
bool user_activity_seen_;
DISALLOW_COPY_AND_ASSIGN(SessionLengthLimiter);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_SESSION_LENGTH_LIMITER_H_
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