components/cronet/android/cronet_histogram_manager.cc

   1 // Copyright 2014 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 #include "components/cronet/android/cronet_histogram_manager.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/android/jni_array.h"
  11 #include "base/metrics/statistics_recorder.h"
  12 #include "components/cronet/histogram_manager.h"
  13
  14 #include "jni/CronetHistogramManager_jni.h"
  15
  16 namespace cronet {
  17
  18 // Explicitly register static JNI functions.
  19 bool CronetHistogramManagerRegisterJni(JNIEnv* env) {
  20   return RegisterNativesImpl(env);
  21 }
  22
  23 static void EnsureInitialized(JNIEnv* env,
  24                               const JavaParamRef<jobject>& jcaller) {
  25   base::StatisticsRecorder::Initialize();
  26 }
  27
  28 static ScopedJavaLocalRef<jbyteArray> GetHistogramDeltas(
  29     JNIEnv* env,
  30     const JavaParamRef<jobject>& jcaller) {
  31   std::vector<uint8> data;
  32   if (!HistogramManager::GetInstance()->GetDeltas(&data))
  33     return ScopedJavaLocalRef<jbyteArray>();
  34   return base::android::ToJavaByteArray(env, &data[0], data.size());
  35 }
  36
  37 }  // namespace cronet