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// Copyright 2013 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.
#ifndef COMPONENTS_VARIATIONS_VARIATIONS_SEED_PROCESSOR_H_
#define COMPONENTS_VARIATIONS_VARIATIONS_SEED_PROCESSOR_H_
#include <stdint.h>
#include <string>
#include <vector>
#include "base/callback_forward.h"
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/metrics/field_trial.h"
#include "base/strings/string16.h"
#include "base/time/time.h"
#include "base/version.h"
#include "components/variations/proto/study.pb.h"
#include "components/variations/proto/variations_seed.pb.h"
namespace base {
class FeatureList;
}
namespace variations {
class ProcessedStudy;
// Helper class to instantiate field trials from a variations seed.
class VariationsSeedProcessor {
public:
typedef base::Callback<void(uint32_t, const base::string16&)>
UIStringOverrideCallback;
VariationsSeedProcessor();
virtual ~VariationsSeedProcessor();
// Creates field trials from the specified variations |seed|, based on the
// specified configuration, as specified in the parameters. Any study that
// should use low entropy will use |low_entropy_provider| for group
// selection. These studies are defined by ShouldStudyUseLowEntropy;
void CreateTrialsFromSeed(
const VariationsSeed& seed,
const std::string& locale,
const base::Time& reference_date,
const base::Version& version,
Study_Channel channel,
Study_FormFactor form_factor,
const std::string& hardware_class,
const std::string& session_consistency_country,
const std::string& permanent_consistency_country,
const UIStringOverrideCallback& override_callback,
const base::FieldTrial::EntropyProvider* low_entropy_provider,
base::FeatureList* feature_list);
// If the given |study| should alwoys use low entropy. This is true for any
// study that can send data to other Google properties.
static bool ShouldStudyUseLowEntropy(const Study& study);
private:
friend class VariationsSeedProcessorTest;
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest,
AllowForceGroupAndVariationId);
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest,
AllowVariationIdWithForcingFlag);
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest,
ForbidForceGroupWithVariationId);
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest, ForceGroupWithFlag1);
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest, ForceGroupWithFlag2);
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest,
ForceGroup_ChooseFirstGroupWithFlag);
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest,
ForceGroup_DontChooseGroupWithFlag);
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest, IsStudyExpired);
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest, VariationParams);
FRIEND_TEST_ALL_PREFIXES(VariationsSeedProcessorTest,
VariationParamsWithForcingFlag);
// Check if the |study| is only associated with platform Android/iOS and
// channel dev/canary. If so, forcing flag and variation id can both be set.
// (Otherwise, forcing_flag and variation_id are mutually exclusive.)
bool AllowVariationIdWithForcingFlag(const Study& study);
// Creates and registers a field trial from the |processed_study| data.
// Disables the trial if |processed_study.is_expired| is true. Uses
// |low_entropy_provider| if ShouldStudyUseLowEntropy returns true for the
// study.
void CreateTrialFromStudy(
const ProcessedStudy& processed_study,
const UIStringOverrideCallback& override_callback,
const base::FieldTrial::EntropyProvider* low_entropy_provider,
base::FeatureList* feature_list);
DISALLOW_COPY_AND_ASSIGN(VariationsSeedProcessor);
};
} // namespace variations
#endif // COMPONENTS_VARIATIONS_VARIATIONS_SEED_PROCESSOR_H_
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