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// Copyright (c) 2011 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_RENDERER_PRERENDER_PRERENDER_HELPER_H_
#define CHROME_RENDERER_PRERENDER_PRERENDER_HELPER_H_
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/time/time.h"
#include "chrome/common/prerender_types.h"
#include "content/public/renderer/render_frame_observer.h"
#include "content/public/renderer/render_frame_observer_tracker.h"
namespace prerender {
class PrerenderURLLoaderThrottle;
// Helper class to track whether its RenderFrame is currently being prerendered.
// Created when prerendering starts and deleted as soon as it stops.
class PrerenderHelper
: public content::RenderFrameObserver,
public content::RenderFrameObserverTracker<PrerenderHelper> {
public:
PrerenderHelper(content::RenderFrame* render_frame,
PrerenderMode prerender_mode,
const std::string& histogram_prefix);
~PrerenderHelper() override;
// Called when a PrerenderURLLoaderThrottle is created for a resource for
// this frame.
void AddThrottle(const base::WeakPtr<PrerenderURLLoaderThrottle>& throttle);
PrerenderMode prerender_mode() const { return prerender_mode_; }
std::string histogram_prefix() const { return histogram_prefix_; }
// Returns true if |render_view| is currently prerendering.
static bool IsPrerendering(const content::RenderFrame* render_frame);
static PrerenderMode GetPrerenderMode(
const content::RenderFrame* render_frame);
private:
// RenderFrameObserver implementation.
bool OnMessageReceived(const IPC::Message& message) override;
void OnDestruct() override;
void OnSetIsPrerendering(PrerenderMode mode,
const std::string& histogram_prefix);
PrerenderMode prerender_mode_;
std::string histogram_prefix_;
// Pending requests for this frame..
std::vector<base::WeakPtr<PrerenderURLLoaderThrottle>> throttles_;
DISALLOW_COPY_AND_ASSIGN(PrerenderHelper);
};
} // namespace prerender
#endif // CHROME_RENDERER_PRERENDER_PRERENDER_HELPER_H_
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