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// Copyright 2014 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_POWER_RENDERER_FREEZER_H_
#define CHROME_BROWSER_CHROMEOS_POWER_RENDERER_FREEZER_H_
#include <set>
#include "base/callback.h"
#include "base/cancelable_callback.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/process/kill.h"
#include "base/time/time.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/dbus/power_manager_client.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/render_process_host_observer.h"
namespace content {
class RenderProcessHost;
}
namespace chromeos {
class ScreenLocker;
// Freezes the chrome renderers when the system is about to suspend and thaws
// them after the system fully resumes. This class registers itself as a
// PowerManagerClient::Observer on creation and unregisters itself on
// destruction.
class CHROMEOS_EXPORT RendererFreezer
: public PowerManagerClient::RenderProcessManagerDelegate,
public content::NotificationObserver,
public content::RenderProcessHostObserver {
public:
class Delegate {
public:
typedef base::Callback<void(bool)> ResultCallback;
virtual ~Delegate() {}
// If |frozen| is true, marks the renderer process |handle| to be frozen
// when FreezeRenderers() is called; otherwise marks it to remain unfrozen.
// Performs the operation asynchronously on the FILE thread.
virtual void SetShouldFreezeRenderer(base::ProcessHandle handle,
bool frozen) = 0;
// Freezes the renderers marked for freezing by SetShouldFreezeRenderer().
// Performs the operation asynchronously on the FILE thread.
virtual void FreezeRenderers() = 0;
// Thaws the chrome renderers that were frozen by the call to
// FreezeRenderers(). Performs the operation asynchronously on the FILE
// thread and runs |callback| with the result on the UI thread.
virtual void ThawRenderers(ResultCallback callback) = 0;
// Asynchronously checks on the FILE thread if the delegate can freeze
// renderers and runs |callback| on the UI thread with the result.
virtual void CheckCanFreezeRenderers(ResultCallback callback) = 0;
};
explicit RendererFreezer(scoped_ptr<Delegate> delegate);
~RendererFreezer() override;
// PowerManagerClient::RenderProcessManagerDelegate implementation.
void SuspendImminent() override;
void SuspendDone() override;
// content::NotificationObserver implementation.
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
// content::RenderProcessHostObserver overrides.
void RenderProcessExited(content::RenderProcessHost* host,
base::TerminationStatus status,
int exit_code) override;
void RenderProcessHostDestroyed(content::RenderProcessHost* host) override;
private:
// Called after checking if the delegate is capable of freezing renderers.
void OnCheckCanFreezeRenderersComplete(bool can_freeze);
// Called after thawing the renderers has completed.
void OnThawRenderersComplete(bool success);
// Called whenever the screen locker is shown or hidden.
void OnScreenLockStateChanged(chromeos::ScreenLocker* locker, bool is_locked);
// Called whenever a new renderer process is created.
void OnRenderProcessCreated(content::RenderProcessHost* rph);
// Delegate that takes care of actually freezing and thawing renderers for us.
scoped_ptr<Delegate> delegate_;
// Set that keeps track of the RenderProcessHosts for processes that are
// hosting GCM extensions.
std::set<int> gcm_extension_processes_;
// Manages notification registrations.
content::NotificationRegistrar registrar_;
base::WeakPtrFactory<RendererFreezer> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(RendererFreezer);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_POWER_RENDERER_FREEZER_H_
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