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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_POWER_RENDERER_FREEZER_H_
#define CHROME_BROWSER_ASH_POWER_RENDERER_FREEZER_H_
#include <memory>
#include <set>
#include "base/cancelable_callback.h"
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/process/kill.h"
#include "chromeos/dbus/power/power_manager_client.h"
#include "content/public/browser/render_process_host_creation_observer.h"
#include "content/public/browser/render_process_host_observer.h"
namespace content {
class RenderProcessHost;
} // namespace content
namespace ash {
// 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 RendererFreezer
: public chromeos::PowerManagerClient::RenderProcessManagerDelegate,
public content::RenderProcessHostCreationObserver,
public content::RenderProcessHostObserver {
public:
class Delegate {
public:
using ResultCallback = base::OnceCallback<void(bool)>;
virtual ~Delegate() = default;
// 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(std::unique_ptr<Delegate> delegate);
RendererFreezer(const RendererFreezer&) = delete;
RendererFreezer& operator=(const RendererFreezer&) = delete;
~RendererFreezer() override;
// PowerManagerClient::RenderProcessManagerDelegate implementation.
void SuspendImminent() override;
void SuspendDone() override;
// content::RenderProcessHostCreationObserver implementation.
void OnRenderProcessHostCreated(content::RenderProcessHost* host) override;
// content::RenderProcessHostObserver overrides.
void RenderProcessExited(
content::RenderProcessHost* host,
const content::ChildProcessTerminationInfo& info) 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 a new renderer process is created.
void OnRenderProcessCreated(content::RenderProcessHost* rph);
// Delegate that takes care of actually freezing and thawing renderers for us.
std::unique_ptr<Delegate> delegate_;
// Records whether the delegate is able to freeze renderers. If not,
// RenderProcessHosts are not tracked for freezing.
bool can_freeze_renderers_ = false;
// Set that keeps track of the RenderProcessHosts for processes that are
// hosting GCM extensions.
std::set<int> gcm_extension_processes_;
base::WeakPtrFactory<RendererFreezer> weak_factory_{this};
};
} // namespace ash
#endif // CHROME_BROWSER_ASH_POWER_RENDERER_FREEZER_H_
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