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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_NO_STATE_PREFETCH_RENDERER_NO_STATE_PREFETCH_HELPER_H_
#define COMPONENTS_NO_STATE_PREFETCH_RENDERER_NO_STATE_PREFETCH_HELPER_H_
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "content/public/renderer/render_frame_observer.h"
#include "content/public/renderer/render_frame_observer_tracker.h"
namespace blink {
class URLLoaderThrottle;
} // namespace blink
namespace prerender {
class NoStatePrefetchURLLoaderThrottle;
// Helper class to track whether its RenderFrame is currently being no-state
// prefetched. Created when prefetching starts and deleted as soon as it stops.
class NoStatePrefetchHelper
: public content::RenderFrameObserver,
public content::RenderFrameObserverTracker<NoStatePrefetchHelper> {
public:
NoStatePrefetchHelper(content::RenderFrame* render_frame,
const std::string& histogram_prefix);
NoStatePrefetchHelper(const NoStatePrefetchHelper&) = delete;
NoStatePrefetchHelper& operator=(const NoStatePrefetchHelper&) = delete;
~NoStatePrefetchHelper() override;
// Configures and returns a new NoStatePrefetchURLLoaderThrottle instance if
// the indicated frame has an associated NoStatePrefetchHelper.
static std::unique_ptr<blink::URLLoaderThrottle> MaybeCreateThrottle(
const blink::LocalFrameToken& frame_token);
// Returns true if |render_frame| is currently prefetching.
static bool IsPrefetching(const content::RenderFrame* render_frame);
std::string histogram_prefix() const { return histogram_prefix_; }
private:
// RenderFrameObserver implementation.
void DidDispatchDOMContentLoadedEvent() override;
void OnDestruct() override;
void AddThrottle(NoStatePrefetchURLLoaderThrottle& throttle);
void OnThrottleDestroyed();
void SendPrefetchFinished();
std::string histogram_prefix_;
int prefetch_count_ = 0;
bool prefetch_finished_ = false;
base::TimeTicks start_time_;
base::WeakPtrFactory<NoStatePrefetchHelper> weak_factory_{this};
};
} // namespace prerender
#endif // COMPONENTS_NO_STATE_PREFETCH_RENDERER_NO_STATE_PREFETCH_HELPER_H_
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