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// Copyright (c) 2012 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 "chrome/common/metrics/variations/variations_util.h"
#include <map>
#include <vector>
#include "base/memory/singleton.h"
#include "base/sha1.h"
#include "base/string16.h"
#include "base/stringprintf.h"
#include "base/sys_byteorder.h"
#include "base/utf_string_conversions.h"
#include "chrome/common/child_process_logging.h"
#include "chrome/common/metrics/metrics_util.h"
#include "chrome/common/metrics/variations/variation_ids.h"
namespace chrome_variations {
namespace {
// The internal singleton accessor for the map, used to keep it thread-safe.
class GroupMapAccessor {
public:
// Retrieve the singleton.
static GroupMapAccessor* GetInstance() {
return Singleton<GroupMapAccessor>::get();
}
GroupMapAccessor() {}
~GroupMapAccessor() {}
// Note that this normally only sets the ID for a group the first time, unless
// |force| is set to true, in which case it will always override it.
void AssociateID(const SelectedGroupId& group_identifier,
const VariationID id,
const bool force) {
base::AutoLock scoped_lock(lock_);
if (force ||
group_to_id_map_.find(group_identifier) == group_to_id_map_.end())
group_to_id_map_[group_identifier] = id;
}
VariationID GetID(const SelectedGroupId& group_identifier) {
base::AutoLock scoped_lock(lock_);
GroupToIDMap::const_iterator it = group_to_id_map_.find(group_identifier);
if (it == group_to_id_map_.end())
return kEmptyID;
return it->second;
}
private:
typedef std::map<SelectedGroupId, VariationID, SelectedGroupIdCompare>
GroupToIDMap;
base::Lock lock_;
GroupToIDMap group_to_id_map_;
DISALLOW_COPY_AND_ASSIGN(GroupMapAccessor);
};
SelectedGroupId MakeSelectedGroupId(const std::string& trial_name,
const std::string& group_name) {
SelectedGroupId id;
id.name = metrics::HashName(trial_name);
id.group = metrics::HashName(group_name);
return id;
}
// Populates |name_group_ids| based on |selected_groups|.
void GetFieldTrialSelectedGroupIdsForSelectedGroups(
const base::FieldTrial::SelectedGroups& selected_groups,
std::vector<SelectedGroupId>* name_group_ids) {
DCHECK(name_group_ids->empty());
for (base::FieldTrial::SelectedGroups::const_iterator it =
selected_groups.begin(); it != selected_groups.end(); ++it) {
name_group_ids->push_back(MakeSelectedGroupId(it->trial, it->group));
}
}
} // namespace
void GetFieldTrialSelectedGroupIds(
std::vector<SelectedGroupId>* name_group_ids) {
DCHECK(name_group_ids->empty());
// A note on thread safety: Since GetFieldTrialSelectedGroups is thread
// safe, and we operate on a separate list of that data, this function is
// technically thread safe as well, with respect to the FieldTriaList data.
base::FieldTrial::SelectedGroups selected_groups;
base::FieldTrialList::GetFieldTrialSelectedGroups(&selected_groups);
GetFieldTrialSelectedGroupIdsForSelectedGroups(selected_groups,
name_group_ids);
}
void GetFieldTrialSelectedGroupIdsAsStrings(
std::vector<string16>* output) {
DCHECK(output->empty());
std::vector<SelectedGroupId> name_group_ids;
GetFieldTrialSelectedGroupIds(&name_group_ids);
for (size_t i = 0; i < name_group_ids.size(); ++i) {
output->push_back(UTF8ToUTF16(base::StringPrintf(
"%x-%x", name_group_ids[i].name, name_group_ids[i].group)));
}
}
void AssociateGoogleVariationID(const std::string& trial_name,
const std::string& group_name,
chrome_variations::VariationID id) {
GroupMapAccessor::GetInstance()->AssociateID(
MakeSelectedGroupId(trial_name, group_name), id, false);
}
void AssociateGoogleVariationIDForce(const std::string& trial_name,
const std::string& group_name,
chrome_variations::VariationID id) {
GroupMapAccessor::GetInstance()->AssociateID(
MakeSelectedGroupId(trial_name, group_name), id, true);
}
chrome_variations::VariationID GetGoogleVariationID(
const std::string& trial_name,
const std::string& group_name) {
return GroupMapAccessor::GetInstance()->GetID(
MakeSelectedGroupId(trial_name, group_name));
}
void GenerateVariationChunks(const std::vector<string16>& experiments,
std::vector<string16>* chunks) {
string16 current_chunk;
for (size_t i = 0; i < experiments.size(); ++i) {
const size_t needed_length =
(current_chunk.empty() ? 1 : 0) + experiments[i].length();
if (current_chunk.length() + needed_length > kMaxVariationChunkSize) {
chunks->push_back(current_chunk);
current_chunk = experiments[i];
} else {
if (!current_chunk.empty())
current_chunk.push_back(',');
current_chunk += experiments[i];
}
}
if (!current_chunk.empty())
chunks->push_back(current_chunk);
}
void SetChildProcessLoggingVariationList() {
std::vector<string16> experiment_strings;
GetFieldTrialSelectedGroupIdsAsStrings(&experiment_strings);
child_process_logging::SetExperimentList(experiment_strings);
}
// Functions below are exposed for testing explicitly behind this namespace.
// They simply wrap existing functions in this file.
namespace testing {
void TestGetFieldTrialSelectedGroupIdsForSelectedGroups(
const base::FieldTrial::SelectedGroups& selected_groups,
std::vector<SelectedGroupId>* name_group_ids) {
GetFieldTrialSelectedGroupIdsForSelectedGroups(selected_groups,
name_group_ids);
}
} // namespace testing
} // namespace chrome_variations
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