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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 <list>
#include <memory>
#include <set>
#include "base/macros.h"
#include "base/time/tick_clock.h"
#include "content/common/content_export.h"
namespace content {
class WebContents;
// This class handles metrics regarding audible WebContents.
// It records four different histograms:
// - 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.
// - if an audible tab was closed and we only have one audible tab open anymore
// then we should record whether we closed the newest or oldest tab.
class CONTENT_EXPORT AudibleMetrics {
public:
// This is used for recording whether the audible tab that exited concurrent
// playback was the most recent. It is used for recording a histogram so
// values should not be changed.
enum class ExitConcurrentPlaybackContents {
kMostRecent = 0,
kOlder = 1,
kMaxValue = kOlder,
};
AudibleMetrics();
~AudibleMetrics();
void UpdateAudibleWebContentsState(const WebContents* web_contents,
bool audible);
void WebContentsDestroyed(const WebContents* web_contents,
bool recently_audible);
void SetClockForTest(const base::TickClock* test_clock);
int GetAudibleWebContentsSizeForTest() const {
return audible_web_contents_.size();
}
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_;
// This stores the audible web contents in insertion order. We add a
// web contents to the list when it becomes audible and remove it is
// destroyed.
std::list<const WebContents*> last_audible_web_contents_;
// Stores all the web contents that are currently audible. We add a web
// contents to the set when it becomes currently audible and remove it when it
// is no longer audible.
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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