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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.
#include "base/metrics/field_trial_param_associator.h"
#include "base/metrics/field_trial.h"
namespace base {
FieldTrialParamAssociator::FieldTrialParamAssociator() {}
FieldTrialParamAssociator::~FieldTrialParamAssociator() {}
// static
FieldTrialParamAssociator* FieldTrialParamAssociator::GetInstance() {
return Singleton<FieldTrialParamAssociator,
LeakySingletonTraits<FieldTrialParamAssociator>>::get();
}
bool FieldTrialParamAssociator::AssociateFieldTrialParams(
const std::string& trial_name,
const std::string& group_name,
const FieldTrialParams& params) {
if (FieldTrialList::IsTrialActive(trial_name))
return false;
AutoLock scoped_lock(lock_);
const FieldTrialKey key(trial_name, group_name);
if (ContainsKey(field_trial_params_, key))
return false;
field_trial_params_[key] = params;
return true;
}
bool FieldTrialParamAssociator::GetFieldTrialParams(
const std::string& trial_name,
FieldTrialParams* params) {
FieldTrial* field_trial = FieldTrialList::Find(trial_name);
if (!field_trial)
return false;
// First try the local map, falling back to getting it from shared memory.
if (GetFieldTrialParamsWithoutFallback(trial_name, field_trial->group_name(),
params)) {
return true;
}
// TODO(lawrencewu): add the params to field_trial_params_ for next time.
return FieldTrialList::GetParamsFromSharedMemory(field_trial, params);
}
bool FieldTrialParamAssociator::GetFieldTrialParamsWithoutFallback(
const std::string& trial_name,
const std::string& group_name,
FieldTrialParams* params) {
AutoLock scoped_lock(lock_);
const FieldTrialKey key(trial_name, group_name);
if (!ContainsKey(field_trial_params_, key))
return false;
*params = field_trial_params_[key];
return true;
}
void FieldTrialParamAssociator::ClearAllParamsForTesting() {
{
AutoLock scoped_lock(lock_);
field_trial_params_.clear();
}
FieldTrialList::ClearParamsFromSharedMemoryForTesting();
}
void FieldTrialParamAssociator::ClearAllCachedParamsForTesting() {
AutoLock scoped_lock(lock_);
field_trial_params_.clear();
}
} // namespace base
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