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// Copyright 2017 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 "components/variations/variations_id_collection.h"
#include "base/callback_helpers.h"
#include "base/feature_list.h"
#include "base/metrics/field_trial_params.h"
#include "base/stl_util.h"
#include "base/time/time.h"
#include "components/variations/active_field_trials.h"
namespace variations {
VariationsIdCollection::VariationsIdCollection(
IDCollectionKey collection_key,
base::RepeatingCallback<void(VariationID)> new_id_callback)
: collection_key_(collection_key) {
base::FieldTrialList::AddObserver(this);
base::FieldTrial::ActiveGroups initial_groups;
base::FieldTrialList::GetActiveFieldTrialGroups(&initial_groups);
for (const base::FieldTrial::ActiveGroup& group : initial_groups) {
OnFieldTrialGroupFinalized(group.trial_name, group.group_name);
}
// Delay setting |new_id_callback_| until initialization is over.
new_id_callback_ = new_id_callback;
}
VariationsIdCollection::~VariationsIdCollection() {
base::FieldTrialList::RemoveObserver(this);
}
void VariationsIdCollection::OnFieldTrialGroupFinalized(
const std::string& trial_name,
const std::string& group_name) {
const VariationID id =
GetGoogleVariationID(collection_key_, trial_name, group_name);
if (id != EMPTY_ID) {
bool modified = id_set_.insert(id).second;
if (modified && new_id_callback_)
new_id_callback_.Run(id);
}
}
const std::set<VariationID>& VariationsIdCollection::GetIds() {
return id_set_;
}
} // namespace variations
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