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// Copyright 2015 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_ANDROID_METRICS_UMA_SESSION_STATS_H_
#define CHROME_BROWSER_ANDROID_METRICS_UMA_SESSION_STATS_H_
#include <jni.h>
#include <stdint.h>
#include <memory>
#include <string>
#include <vector>
#include "base/android/scoped_java_ref.h"
#include "base/no_destructor.h"
#include "base/time/time.h"
#include "components/variations/synthetic_trials.h"
// The native part of java UmaSessionStats class. This is a singleton.
class UmaSessionStats {
public:
void UmaResumeSession(JNIEnv* env,
const base::android::JavaParamRef<jobject>& obj);
void UmaEndSession(JNIEnv* env,
const base::android::JavaParamRef<jobject>& obj);
// Called before an UMA log is completed to record associated metrics.
void ProvideCurrentSessionData();
static UmaSessionStats* GetInstance();
UmaSessionStats(const UmaSessionStats&) = delete;
UmaSessionStats& operator=(const UmaSessionStats&) = delete;
// Returns true if there is a visible activity. Android Chrome only.
static bool HasVisibleActivity();
// Called once on browser startup.
static void OnStartup();
static void RegisterSyntheticFieldTrial(
const std::string& trial_name,
const std::string& group_name,
variations::SyntheticTrialAnnotationMode annotation_mode);
static bool IsBackgroundSessionStartForTesting();
// Reads counters Chrome.UMA.OnPostCreateCounter2 and
// Chrome.UMA.OnResumeCounter2 that are written to in ChromeActivity.java. The
// counters are encoded in an enum histogram, emitted and reset to 0.
static void EmitAndResetCounters();
private:
friend class base::NoDestructor<UmaSessionStats>;
UmaSessionStats() = default;
~UmaSessionStats() = default;
class SessionTimeTracker {
public:
SessionTimeTracker() = default;
SessionTimeTracker(const SessionTimeTracker&) = delete;
SessionTimeTracker& operator=(const SessionTimeTracker&) = delete;
// Adds time to |background_session_start_time_| if a background session is
// currently active.
void AccumulateBackgroundSessionTime();
// Reports accumulated background session time, if any exists.
void ReportBackgroundSessionTime();
// Ends any background session, and begins a new foreground session timer.
// Returns whether a background session was terminated by this foreground
// session.
bool BeginForegroundSession();
// Marks the end of a foreground session and returns its duration.
base::TimeDelta EndForegroundSession();
// Begins a new background session timer.
void BeginBackgroundSession();
base::TimeTicks session_start_time() const { return session_start_time_; }
base::TimeTicks background_session_start_time() const {
return background_session_start_time_;
}
private:
// Start of the current session.
base::TimeTicks session_start_time_;
// Start of the current background session. Null if there is no active
// background session.
base::TimeTicks background_session_start_time_;
// Total accumulated and unreported background session time.
base::TimeDelta background_session_accumulated_time_;
};
SessionTimeTracker session_time_tracker_;
int active_session_count_ = 0;
};
#endif // CHROME_BROWSER_ANDROID_METRICS_UMA_SESSION_STATS_H_
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