chrome/browser/android/metrics/uma_session_stats.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_ANDROID_METRICS_UMA_SESSION_STATS_H_
   6 #define CHROME_BROWSER_ANDROID_METRICS_UMA_SESSION_STATS_H_
   7
   8 #include <jni.h>
   9 #include <string>
  10
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/time/time.h"
  13
  14 class UserActionRateCounter;
  15
  16 // The native part of java UmaSessionStats class.
  17 class UmaSessionStats {
  18  public:
  19   UmaSessionStats();
  20
  21   void UmaResumeSession(JNIEnv* env, jobject obj);
  22   void UmaEndSession(JNIEnv* env, jobject obj);
  23
  24   static void RegisterSyntheticFieldTrialWithNameHash(
  25       uint32_t trial_name_hash,
  26       const std::string& group_name);
  27
  28   static void RegisterSyntheticFieldTrial(
  29       const std::string& trial_name,
  30       const std::string& group_name);
  31
  32  private:
  33   ~UmaSessionStats();
  34
  35   // Start of the current session, used for UMA.
  36   base::TimeTicks session_start_time_;
  37   int active_session_count_;
  38
  39   DISALLOW_COPY_AND_ASSIGN(UmaSessionStats);
  40 };
  41
  42 // Registers the native methods through jni
  43 bool RegisterUmaSessionStats(JNIEnv* env);
  44
  45 #endif  // CHROME_BROWSER_ANDROID_METRICS_UMA_SESSION_STATS_H_