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// Copyright 2016 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 CONTENT_BROWSER_MEDIA_AUDIBLE_METRICS_H_
#define CONTENT_BROWSER_MEDIA_AUDIBLE_METRICS_H_
#include <memory>
#include <set>
#include "base/time/tick_clock.h"
#include "content/common/content_export.h"
namespace content {
class WebContents;
// This class handles metrics regarding audible WebContents.
// It does register three different information:
// - how many WebContents are audible when a WebContents become audible.
// - how long multiple WebContents are audible at the same time.
// - for a browsing session, how often and how many WebContents get audible at
// the same time.
class CONTENT_EXPORT AudibleMetrics {
public:
AudibleMetrics();
~AudibleMetrics();
void UpdateAudibleWebContentsState(const WebContents* web_contents,
bool audible);
void SetClockForTest(const base::TickClock* test_clock);
private:
void AddAudibleWebContents(const WebContents* web_contents);
void RemoveAudibleWebContents(const WebContents* web_contents);
base::TimeTicks concurrent_web_contents_start_time_;
size_t max_concurrent_audible_web_contents_in_session_;
const base::TickClock* clock_;
std::set<const WebContents*> audible_web_contents_;
DISALLOW_COPY_AND_ASSIGN(AudibleMetrics);
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_AUDIBLE_METRICS_H_
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