| // Copyright 2014 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. |
| |
| #include <jni.h> |
| |
| #include <map> |
| #include <string> |
| |
| #include "base/android/jni_string.h" |
| #include "base/base_jni_headers/FieldTrialList_jni.h" |
| #include "base/lazy_instance.h" |
| #include "base/macros.h" |
| #include "base/metrics/field_trial.h" |
| #include "base/metrics/field_trial_params.h" |
| |
| using base::android::ConvertJavaStringToUTF8; |
| using base::android::ConvertUTF8ToJavaString; |
| using base::android::JavaParamRef; |
| using base::android::ScopedJavaLocalRef; |
| |
| namespace { |
| |
| // Log trials and their groups on activation, for debugging purposes. |
| class TrialLogger : public base::FieldTrialList::Observer { |
| public: |
| TrialLogger() {} |
| |
| void OnFieldTrialGroupFinalized(const std::string& trial_name, |
| const std::string& group_name) override { |
| Log(trial_name, group_name); |
| } |
| |
| static void Log(const std::string& trial_name, |
| const std::string& group_name) { |
| LOG(INFO) << "Active field trial \"" << trial_name |
| << "\" in group \"" << group_name<< '"'; |
| } |
| |
| protected: |
| ~TrialLogger() override {} |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(TrialLogger); |
| }; |
| |
| base::LazyInstance<TrialLogger>::Leaky g_trial_logger = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| } // namespace |
| |
| static ScopedJavaLocalRef<jstring> JNI_FieldTrialList_FindFullName( |
| JNIEnv* env, |
| const JavaParamRef<jstring>& jtrial_name) { |
| std::string trial_name(ConvertJavaStringToUTF8(env, jtrial_name)); |
| return ConvertUTF8ToJavaString( |
| env, base::FieldTrialList::FindFullName(trial_name)); |
| } |
| |
| static jboolean JNI_FieldTrialList_TrialExists( |
| JNIEnv* env, |
| const JavaParamRef<jstring>& jtrial_name) { |
| std::string trial_name(ConvertJavaStringToUTF8(env, jtrial_name)); |
| return base::FieldTrialList::TrialExists(trial_name); |
| } |
| |
| static ScopedJavaLocalRef<jstring> JNI_FieldTrialList_GetVariationParameter( |
| JNIEnv* env, |
| const JavaParamRef<jstring>& jtrial_name, |
| const JavaParamRef<jstring>& jparameter_key) { |
| std::map<std::string, std::string> parameters; |
| base::GetFieldTrialParams(ConvertJavaStringToUTF8(env, jtrial_name), |
| ¶meters); |
| return ConvertUTF8ToJavaString( |
| env, parameters[ConvertJavaStringToUTF8(env, jparameter_key)]); |
| } |
| |
| static void JNI_FieldTrialList_LogActiveTrials(JNIEnv* env) { |
| DCHECK(!g_trial_logger.IsCreated()); // This need only be called once. |
| |
| LOG(INFO) << "Logging active field trials..."; |
| base::FieldTrialList::AddObserver(&g_trial_logger.Get()); |
| |
| // Log any trials that were already active before adding the observer. |
| std::vector<base::FieldTrial::ActiveGroup> active_groups; |
| base::FieldTrialList::GetActiveFieldTrialGroups(&active_groups); |
| for (const base::FieldTrial::ActiveGroup& group : active_groups) { |
| TrialLogger::Log(group.trial_name, group.group_name); |
| } |
| } |